Residential/Commercial Generator Sets Models: 14/20RES 14/20RESL Controller: RDC Residential Digital Control DC Digital Control TP-6734 5/10 Operation
Residential/Commercial Generator Sets
Models:
14/20RES
14/20RESL
Controller:
RDC Residential Digital ControlDC Digital Control
TP-6734 5/10
Operation
Engine exhaust from this product contains chemicals
known to the State of California to cause cancer, birth
defects, or other reproductive harm.
WARNING
California Proposition 65
Product Identification Information
Product identification numbers determine service parts.
Record the product identification numbers in the spaces
below immediately after unpacking the products so that
the numbers are readily available for future reference.
Record field-installed kit numbers after installing the
kits.
Generator Set Identification Numbers
Record the product identification numbers from the
generator set nameplate(s).
Model Designation
Specification Number
Serial Number
Accessory Number Accessory Description
Controller Identification
Record the controller description from the generator set
operation manual, spec sheet, or sales invoice.
Controller Description
Engine Identification
Record the product identification information from the
engine nameplate.
Manufacturer
Model Designation
Serial Number
Table of Contents
TP-6734 5/10 Table of Contents
Product Identification Information 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety Precautions and Instructions 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Introduction 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Service Assistance 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section 1 Descriptions and Service Views 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Introduction 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Engine 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.3 Alternator 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.4 Transfer Switch 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.5 Controllers 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.6 Accessories 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.6.1 Carburetor heater 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.6.2 OnCuet Home Generator Management System 15. . . . . . . . . . . . . . . . . . . .
1.7 Service Views for Maintenance 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section 2 Operation 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Prestart Checklist 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Exercising the Generator Set 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 RDC and DC Generator Set/ Transfer Switch Controllers 17. . . . . . . . . . . . . . . . . . .
2.4 Controller Power 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 Controls and Indicators 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5.1 LED Display 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5.2 Controller Keypad 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.5.3 LED Indicators 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6 Generator Set Operation 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.1 Engine Start Crank Cycle 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.2 Local Starting and Stopping 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.6.3 Automatic Operation with Model RRT Transfer Switch 21. . . . . . . . . . . . . .
2.6.4 Automatic Operation with Model RDT or RSB Transfer Switches 21. . . . .
2.7 Exercise 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7.1 Unloaded Exercise with Diagnostic Test 22. . . . . . . . . . . . . . . . . . . . . . . . . .
2.7.2 Low-Speed Diagnostics 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7.3 Loaded Exercise 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7.4 Exerciser Reset and Disable 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.7.5 Power Failure During Exercise Cycle 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.8 Test 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.8.1 Unloaded Test 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.8.2 Loaded Test 23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.8.3 Power Failure During Test Cycle 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.9 Faults 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.9.1 Warnings 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.9.2 Shutdowns 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.9.3 ATS Communication Errors 24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.9.4 Resetting the Controller after a Fault Shutdown 24. . . . . . . . . . . . . . . . . . . .
2.10 Model RRT Transfer Switch Operation 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.10.1 Source Availability 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.10.2 ATS Control Sequence of Operation 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.10.3 Time Delays 27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.10.4 Engine and Transfer Time Delays 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.10.5 Load Control Time Delay 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.11 Event History 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table of Contents, continued
TP-6734 5/10Table of Contents
Section 3 Scheduled Maintenance 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Scheduled Maintenance 29. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1.1 Service Schedule, 14RES/RESL Models 30. . . . . . . . . . . . . . . . . . . . . . . . .
3.1.2 Service Schedule, 20RES/RESL Models 31. . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Lubrication System 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.1 Low Oil Pressure Shutdown 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.2 Oil Check 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.3 Engine Oil Recommendation 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.4 Oil Change Procedure 32. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2.5 Oil Cooler 20RES/RESL 33. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 Spark Plugs 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4 Air Cleaner Service 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.1 Air Cleaner, 14RES/RESL Models 34. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.4.2 Air Cleaner, 20RES/RESL Models 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.5 Cooling System 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.6 Exhaust System 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.7 Battery 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8 Battery Charger 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.8.1 RES Battery Charger 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.9 Circuit Protection 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.9.1 Line Circuit Breaker 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.9.2 Fuses 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.10 Storage Procedure 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.10.1 Lubricating System 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.10.2 Fuel System 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.10.3 Cylinder Lubrication 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.10.4 Exterior Preparation 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.10.5 Battery 40. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Section 4 Troubleshooting 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Introduction 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Controller Service Access 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 Generator Set Troubleshooting 41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.4 Battery Charger Troubleshooting 43. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix A Abbreviations 45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TP-6734 5/10 5Safety Precautions and Instructions
Safety Precautions and Instructions
IMPORTANT SAFETY INSTRUCTIONS.
Electromechanical equipment,including generator sets, transferswitches,switchgear, andaccessories,
can cause bodily harm and poselife-threatening danger whenimproperly installed, operated, ormaintained. To prevent accidents beaware of potential dangers and actsafely. Read and follow all safety
precautions and instructions. SAVETHESE INSTRUCTIONS.
Thismanual hasseveral typesofsafetyprecautions and instructions: Danger,Warning, Caution, and Notice.
DANGER
Danger indicates the presence of ahazard that will cause severe
personal injury,death, orsubstantialproperty damage.
WARNING
Warning indicates the presence of ahazard that can cause severe
personal injury,death,orsubstantialproperty damage.
CAUTION
Caution indicates the presence of ahazard that will or can cause minor
personal injury or property damage.
NOTICE
Notice communicates installation,operation, or maintenance informationthat is safety related but not hazardrelated.
Safety decals affixed to the equipment
in prominent places alert the operatoror service technician to potentialhazards and explain how to act safely.The decals are shown throughout thispublication to improve operatorrecognition. Replace missing or
damaged decals.
Accidental Starting
Accidental starting.Can cause severe injury or death.
Disconnect the battery cables beforeworking on the generator set.
Remove the negative (--) lead firstwhen disconnecting the battery.Reconnect the negative (--) lead lastwhen reconnecting the battery.
WARNING
Disabling the generator set.Accidental starting can causesevere injury or death. Beforeworking on the generator set orconnected equipment, disable the
generator set as follows: (1) Move thegenerator set master switch to theOFFposition. (2) Disconnect the power tothe battery charger. (3) Remove thebattery cables, negative (--) lead first.Reconnect the negative (--) lead last
when reconnecting the battery. Followthese precautions to prevent starting ofthe generator set by an automatictransfer switch, remote start/stopswitch, or engine start command fromaremote computer.
Battery
Sulfuric acid in batteries.Can cause severe injury or death.
Wear protective goggles andclothing. Battery acid may cause
blindness and burn skin.
WARNING
Explosion.Can cause severe injury or death.Relays in the battery chargercause arcs or sparks.
Locate the battery in awell-ventilatedarea. Isolate thebattery charger fromexplosive fumes.
WARNING
Battery electrolyte is a dilutedsulfuric acid. Batteryacidcancausesevere injury or death. Battery acid
can cause blindness and burn skin.Always wear splashproof safetygoggles, rubber gloves, and bootswhen servicing the battery. Do notopen a sealed battery or mutilate thebattery case. If battery acid splashes in
the eyes or on the skin, immediatelyflush the affected area for 15 minuteswith large quantities of clean water.Seek immediatemedical aid in thecaseof eye contact. Never add acid to a
battery after placing the battery inservice, as thismay result inhazardousspattering of battery acid.
Battery acid cleanup. Battery acidcan cause severe injury or death.Battery acid is electrically conductive
and corrosive. Add 500 g (1 lb.) ofbicarbonate of soda (baking soda) to acontainer with 4 L (1 gal.) of water andmix the neutralizing solution. Pour theneutralizing solution on the spilledbattery acid and continue to add the
neutralizing solution to the spilledbattery acid until all evidence of achemical reaction (foaming) hasceased. Flush the resulting liquid withwater and dry the area.
TP-6734 5/106 Safety Precautions and Instructions
Battery gases. Explosion can causesevere injury or death. Battery gasescan cause an explosion. Do not smokeorpermit flamesor sparks to occurnear
a battery at any time, particularly whenit is charging. Do not dispose of abattery in a fire. To prevent burns andsparks that could cause an explosion,avoid touching the battery terminalswith tools or other metal objects.
Removeall jewelrybefore servicing theequipment. Discharge static electricityfrom your body before touchingbatteries by first touching a groundedmetal surfaceaway from thebattery. Toavoid sparks, do not disturb the battery
charger connections while the batteryis charging. Always turn the batterycharger off before disconnecting thebattery connections. Ventilate thecompartments containing batteries toprevent accumulation of explosive
gases.
Battery short circuits. Explosioncan cause severe injury or death.Short circuits can cause bodily injuryand/or equipment damage.Disconnect the battery before
generator set installation ormaintenance. Remove all jewelrybefore servicing the equipment. Usetools with insulated handles. Removethe negative (--) lead first when
disconnecting the battery. Reconnectthe negative (--) lead last whenreconnecting the battery. Neverconnect the negative (--) battery cableto the positive (+) connection terminalof the starter solenoid. Do not test the
battery condition by shorting theterminals together.
Engine Backfire/FlashFire
Fire.Can cause severe injury or death.
Do not smoke or permit flames orsparks near fuels or the fuel system.
WARNING
Servicing the air cleaner. A suddenbackfire can cause severe injury ordeath. Do not operate the generatorset with the air cleaner removed.
Servicing the fuel system. A flashfirecancausesevere injuryordeath.Do not smoke or permit flames orsparks near the carburetor, fuel line,fuel filter, fuel pump, or other potentialsources of spilled fuels or fuel vapors.
Catch fuels in an approved containerwhen removing the fuel line orcarburetor.
Combustible materials. A fire cancause severe injury or death.
Generator set engine fuels and fuelvapors are flammable and explosive.Handle these materials carefully tominimize the risk of fire or explosion.Equip the compartment or nearby areawith a fully charged fire extinguisher.
Select a fire extinguisher rated ABC orBC for electrical fires or asrecommended by the local fire code oran authorized agency. Train allpersonnel on fire extinguisheroperation and fire prevention
procedures.
Exhaust System
Carbon monoxide.Can cause severe nausea,fainting, or death.
The exhaust system must be
leakproof and routinely inspected.
WARNING
Generator set operation. Carbon
monoxidecancauseseverenausea,
fainting, or death. Carbon monoxide
is an odorless, colorless, tasteless,
nonirritating gas that can cause death if
inhaled for even a short time. Avoid
breathingexhaust fumeswhenworking
on or near the generator set. Never
operate the generator set inside a
building. Never operate the generator
set where exhaust gas could seep
inside or be drawn into a potentially
occupied building throughwindows, air
intake vents, or other openings.
Carbon monoxide detectors.Carbonmonoxide can cause severenausea, fainting, or death. Installcarbon monoxide detectors on eachlevel of any building adjacent to thegenerator set. Locate the detectors to
adequately warn the building’soccupants of the presence of carbonmonoxide. Keep the detectorsoperational at all times. Periodicallytest and replace the carbon monoxidedetectors according to the
manufacturer’s instructions.
Carbon monoxide symptoms.Carbonmonoxide can cause severenausea, fainting, or death. Carbonmonoxide isapoisonousgaspresent inexhaust gases. Carbonmonoxide isan
odorless, colorless, tasteless,nonirritating gas that can cause death ifinhaled for even a short time. Carbonmonoxidepoisoningsymptoms includebut are not limited to the following:
Light-headedness, dizziness
Physical fatigue, weakness injoints and muscles
Sleepiness, mental fatigue,inability to concentrateor speak clearly, blurred vision
Stomachache, vomiting, nauseaIf experiencing any of these symptomsand carbon monoxide poisoning ispossible, seek fresh air immediatelyand remain active. Do not sit, lie down,or fall asleep. Alert others to the
possibility of carbon monoxidepoisoning. Seek medical attention ifthe condition of affected persons doesnot improvewithinminutes of breathingfresh air.
TP-6734 5/10 7Safety Precautions and Instructions
Fuel System
Explosive fuel vapors.Can cause severe injury or death.
Use extreme care when handling,storing, and using fuels.
WARNING
The fuel system. Explosive fuelvapors can cause severe injury ordeath. Vaporized fuels are highlyexplosive. Use extreme care whenhandling and storing fuels. Store fuels
in a well-ventilated area away fromspark-producing equipment and out ofthe reach of children. Never add fuel tothe tank while the engine is runningbecause spilled fuel may ignite oncontact with hot parts or from sparks.
Do not smoke or permit flames orsparks to occur near sources of spilledfuel or fuel vapors. Keep the fuel linesand connections tight and in goodcondition. Do not replace flexible fuellines with rigid lines. Use flexible
sections to avoid fuel line breakagecausedbyvibration. Donotoperate thegenerator set in the presence of fuelleaks, fuel accumulation, or sparks.Repair fuel systems before resuming
generator set operation.
Gas fuel leaks. Explosive fuelvapors can cause severe injury ordeath. Fuel leakage can cause anexplosion. Check the LP vapor gas ornatural gas fuel system for leakage by
using a soap and water solution withthe fuel system test pressurized to6--8 ounces per square inch(10--14 inches water column). Do notuse a soap solution containing eitherammonia or chlorine because both
preventbubble formation. Asuccessfultest depends on the ability of thesolution to bubble.
Hazardous Noise
Hazardous noise.
Can cause hearing loss.
Never operate the generator set
without a muffler or with a faulty
exhaust system.
CAUTION
Engine noise. Hazardous noise cancause hearing loss. Generator setsnot equipped with sound enclosurescan produce noise levels greater than105 dBA. Prolongedexposure tonoise
levels greater than 85 dBA can causepermanent hearing loss. Wear hearingprotection when near an operatinggenerator set.
Hazardous Voltage/Moving Parts
Hazardous voltage.Can cause severe injury or death.
Operate the generator set only whenall guards and electrical enclosures
are in place.
Moving parts.
WARNING
Hazardous voltage.
Backfeed to the utility system can
cause property damage, severe
injury, or death.
If the generator set is used for
standby power, install an automatic
transfer switch to prevent inadvertent
interconnection of standby and
normal sources of supply.
WARNING
Welding the generator set.Can cause severe electricalequipment damage.
Never weld components of the
generator set without firstdisconnecting the battery, controllerwiringharness, andengineelectroniccontrol module (ECM).
CAUTION
Grounding electrical equipment.Hazardous voltage can causesevere injury or death. Electrocutionis possible whenever electricity ispresent. Ensure you comply with all
applicable codes and standards.Electrically ground the generator set,transfer switch, and related equipmentandelectrical circuits. Turnoff themaincircuit breakers of all power sources
before servicing the equipment. Nevercontact electrical leads or applianceswhen standing in water or on wetground because these conditionsincrease the risk of electrocution.
Welding on the generator set. Can
cause severe electrical equipmentdamage. Before welding on thegenerator set perform the followingsteps: (1) Remove the battery cables,negative (--) lead first. (2) Disconnectall engine electronic control module
(ECM) connectors. (3) Disconnect allgenerator set controller and voltageregulator circuit board connectors.(4) Disconnect the engine battery-charging alternator connections.(5) Attach the weld ground connection
close to the weld location.
Connecting the battery and thebattery charger. Hazardous voltagecan cause severe injury or death.Reconnect the battery correctly,positive to positive and negative to
negative, to avoid electrical shock anddamage to the battery charger andbattery(ies). Have a qualifiedelectrician install the battery(ies).
TP-6734 5/108 Safety Precautions and Instructions
Short circuits. Hazardousvoltage/current can cause severeinjury or death. Short circuits cancause bodily injury and/or equipment
damage. Do not contact electricalconnections with tools or jewelry whilemaking adjustments or repairs.Removeall jewelrybefore servicing theequipment.
Electrical backfeed to the utility.
Hazardous backfeed voltage cancause severe injury or death. Installa transfer switch in standby powerinstallations to prevent the connectionof standby and other sources of power.
Electrical backfeed into a utilityelectrical system can cause severeinjury or death to utility personnelworking on power lines.
Heavy Equipment
Unbalanced weight.
Improper lifting can cause severe
injury or death and equipment
damage.
Do not use lifting eyes.
Lift the generator set using lifting bars
inserted through the lifting holes on
the skid.
WARNING
Hot Parts
Hot engine and exhaust system.Can cause severe injury or death.
Do not work on the generator set untilit cools.
WARNING
Servicing the exhaust system. Hotparts can cause severe injury ordeath. Do not touch hot engine parts.The engine and exhaust systemcomponents become extremely hot
during operation.
Servicing the engine heater. Hotparts can cause minor personalinjuryorpropertydamage. Install theheater before connecting it to power.
Operating theheater before installationcan cause burns and componentdamage. Disconnect power to theheater and allow it to cool beforeservicing the heater or nearby parts.
Notice
NOTICE
Canadian installations only. Forstandby service connect the output ofthe generator set to a suitably ratedtransfer switch in accordance withCanadian Electrical Code, Part 1.
TP-6734 5/10 9Introduction
Introduction
This manual provides operation and maintenance
instructions for residential/commercial model
14/20RES and RESL generator sets equipped with
Residential Digital Control (RDC) or Digital Control (DC)
generator set/transfer switch controllers. The RDC and
DC controllers control the generator set and the optional
Model RRT transfer switch. See Figure 1.
This generator set is approved for use in stationary
applications in locations served by a reliable utility
power source. Have the generator set installed by an
authorized distributor/dealer or service technician.
Refer to TP-6733, Installation Manual, for installation
instructions.
Information in this publication represents data available
at the time of print. Kohler Co. reserves the right to
change this publication and the products represented
without notice and without any obligation or liability
whatsoever.
Read this manual and carefully follow all procedures
and safety precautions to ensure proper equipment
operation and to avoid bodily injury. Read and follow the
Safety Precautions and Instructions section at the
beginning of this manual. Keep this manual with the
equipment for future reference.
The equipment service requirements are very important
to safe and efficient operation. Inspect the parts often
and perform required service at the prescribed intervals.
Obtain service from an authorized service distributor/
dealer to keep equipment in top condition.
TP-6734
Figure 1 RES/RESL Generator Set and Optional
Model RRT Transfer Switch
List of Related Literature
Figure 2 identifies related literature available for the
generator sets covered in this manual. Only trained and
qualified personnel should install or service the
generator set.
Literature Type Part Number
14/20RES/RESL Generator Set
Installation Manual TP-6733
ModelRRTTransferSwitchOperation/
Installation Manual TP-6751
Figure 2 Generator Set Literature
Nameplate
The following illustration shows a typical generator set
nameplate. Copy the model, serial, and specification
numbers from the nameplate into the spaces provided in
the product information section on the inside front cover
of this manual. See Section 1.7 for the nameplate
location.
GM12070
TP-6734 5/1010 Introduction
Emission Compliance, 14RES/RESL
All model 14RES/RESL generator sets with multi-fuel
systems are emission-certified.
An engine or generator set with the following
identification label is certified to meet Small Off-Road
Engine emission standards for EPA/CARB.
IMPORTANT ENGINE INFORMATION
THIS ENGINE MEETS U.S. EPA PH2 ANDCA 2008 AND LATER EXH EMISSIONREGS FOR SI SORE
FAMILYDISPL (CC)MODEL NO.SPEC NO.SERIAL NO.BUILD DATE
EMISSION COMPLIANCE PERIOD:EPA: CATEGORY A CARB: EXTENDEDCERTIFIED ON: LPG/NATURAL GASREFER TO OWNER’S MANUAL FOR HP RATING,SAFETY, MAINTENANCE, AND ADJUSTMENTS
1-800-544-2444 KohlerEngines.com
KOHLER CO. KOHLER WISCONSIN USAtp6515
N11236
Figure 3 Engine Identification Label, 14RES/RESL
Generator Set
This engine/generator is certified to operate using
natural gas or propane fuel.
The Emission Compliance Period referred to on the
EmissionControl or Air Index label indicates the number
of operating hours for which the engine has been shown
to meet CARB or EPA emission requirements. The
following table provides the engine compliance period
(in hours) associated with the category descriptor found
on the certification label.
Emission Compliance Period (hours)
EPAC250
B500
A1000
CARBModerate,
125Intermediate,
250Extended,
500
Figure 4 14RES/RESL
Refer to the certification label for engine displacement.
The exhaust emission control system for the CH740
engines (14RES/RESL) is EM.
Emission Compliance, 20RES/RESL
The model 20RES/RESL generator set engine is
certified to meet emission regulations for U.S. EPA
phase 2 small off-road engines and CA 2006 and later
LSI engines (large spark-ignited engines at or below 1
liter).
Figure 5 Engine Identification Label, 20RES/RESL
Generator Set
The Emission Compliance Period referred to on the
Engine Identification label indicates the number of
operating hours for which the engine has been shown to
meet EPA emission requirements. The engine
compliance period (in hours), associated with the
Category A descriptor found on the certification label, is
1000 hours.
Emission Compliance Period (hours)
EPA Category A, 1000 hours
Figure 6 20RES/RESL
Refer to the certification label for engine displacement.
The exhaust emission control system for the CH1000
engine (20RES/RESL) is EM.
TP-6734 5/10 11Service Assistance
Service Assistance
For professional advice on generator set power
requirements and conscientious service, please contact
your nearest Kohler distributor or dealer.
Consult the Yellow Pages under the heading
Generators—Electric.
Visit the Kohler Power Systems website at
KohlerPower.com.
Look at the labels and stickers on your Kohler product
or review the appropriate literature or documents
included with the product.
Call toll free in the US and Canada 1-800-544-2444.
Outside the US andCanada, call the nearest regional
office.
Headquarters Europe, Middle East, Africa
(EMEA)
Kohler Power Systems
3 rue de Brennus
93200 Saint Denis
France
Phone: (33) 1 49 178300
Fax: (33) 1 49 178301
Asia Pacific
Power Systems Asia Pacific Regional Office
Singapore, Republic of Singapore
Phone: (65) 6264-6422
Fax: (65) 6264-6455
China
North China Regional Office, Beijing
Phone: (86) 10 6518 7950
(86) 10 6518 7951
(86) 10 6518 7952
Fax: (86) 10 6518 7955
East China Regional Office, Shanghai
Phone: (86) 21 6288 0500
Fax: (86) 21 6288 0550
India, Bangladesh, Sri Lanka
India Regional Office
Bangalore, India
Phone: (91) 80 3366208
(91) 80 3366231
Fax: (91) 80 3315972
Japan, Korea
North Asia Regional Office
Tokyo, Japan
Phone: (813) 3440-4515
Fax: (813) 3440-2727
Latin America
Latin America Regional Office
Lakeland, Florida, USA
Phone: (863) 619-7568
Fax: (863) 701-7131
TP-6734 5/1012 Service Assistance
Notes
TP-6734 5/10 13Section 1 Descriptions and Service Views
Section 1 Descriptions and Service Views
1.1 Introduction
The generator set specification sheets provide specific
generator and engine information. Refer to the spec
sheet for data not supplied in this manual. Consult the
generator set servicemanual, engine operationmanual,
and engine service manual for additional specifications.
Obtain copies of the latest spec sheets, manuals,
diagrams, and drawings from your local distributor/
dealer.
1.2 Engine
The generator set has a four-cycle, twin cylinder, air-
cooled Kohler engine. The engine operates on clean-
burning natural gas or propane (LP) vapor. Engine
features include:
Efficient overhead valve design and full pressure
lubrication for maximum power, torque, and reliability
under all operating conditions.
Dependable, maintenance-free electronic ignition.
Precision-formulated cast iron construction of parts
subjected to the most wear and tear.
Field-convertible multi-fuel systems that allow fuel
changeover from natural gas to LP vapor (and vice-
versa) while maintaining CARB emission
certification.
Digital spark advance optimizes ignition timing for the
selected fuel.
1.3 Alternator
The generator uses Kohler’s unique PowerBoost
voltage regulation system, which provides instant
response to load changes.
PowerBoost ensures reliable motor starting and
consistent voltage levels. PowerBoost utilizes a
voltage excitation system that employs a winding
independent of the main output windings to provide
excitation voltage.
1.4 Transfer Switch
The RDC and DC controllers are designed to
communicate with and control the Kohler model RRT
Automatic Transfer Switch (ATS).
If the power systemuses a transfer switch other than the
Kohler model RRT ATS, the RDC controller functions
as a generator set controller only. ATS communication
and functions do not operate with any other ATS. The
low-speed exercise is not available with any other ATS.
An ATS other than the model RRT must provide engine
start contacts that connect to the remote engine start
leads on the generator set.
TP-6734 5/1014 Section 1 Descriptions and Service Views
1.5 Controllers
RDC (RES) DC (RESL)
Figure 1-1 Controllers
RES models are equipped with the Residential Digital
Control (RDC). RESL models use the Digital Control
(DC). See Figure 1-1. Controller features include:
Integrated control for the generator set and Kohler
Model RRT transfer switch
Membrane keypad for configuration and adjustment
(RDC only)
Password-protected access to system
configuration and adjustment menus
System voltage/frequency selection and engine
configuration
Voltage, gain, and engine speed adjustment
Master switch pushbuttons (Off, Auto, Run)
Off, Auto, and Run LED indicators
LED display:
Crank cycle status
Setup information (RDC only)
Software version
Faults
Event history
Scrolling system status display when generator set is
running includes:
Engine runtime hours
Battery voltage
Generator voltage
Engine temperature
Utility voltage*
Faults displayed:
ATS communication error
Auxiliary fault
High battery voltage
High engine temperature
Locked rotor
Low battery voltage
Low oil pressure
Overcrank
Overfrequency
Overspeed
Overvoltage
Underfrequency
Underspeed
Undervoltage
Selectable exercise and test modes:
Weekly unloaded quiet diagnostic test *
Weekly loaded exercise
Loaded test
Unloaded test
Smart engine cooldown senses engine temperature *
Remote two-wire start/stop capability for optional
connection of Model RDT or RSB transfer switches
Digital isochronous governor to maintain
steady-state speed at all loads
Digital voltage regulation: ±1.5% RMS no-load to
full-load
Automatic start with programmed cranking cycle
Load control output allows delayed start of large
motor loads *
Field-upgradeable controller firmware (requires
KohlerSiteTech software, available only to Kohler
authorized distributors and dealers)
Front-access mini USB connector for software
upgrade
Generator output voltage and frequency sensing with
adjustable voltage pickup and dropout settings
(requires Kohler SiteTech software for
adjustment)
Engine start and transfer time delays, adjustable
using optional Kohler SiteTech software
(available only to Kohler authorized distributors and
dealers) *
Communicates utility voltage sensing data and
transfer signals with the Model RRT transfer switch *
Front access fuses and mini-breaker
* Model RRT transfer switch required
TP-6734 5/10 15Section 1 Descriptions and Service Views
1.6 Accessories
The following optional accessories are offered for the
RES and RESL generator sets.
1.6.1 Carburetor heater
An optional carburetor heater is recommended for
improved cold starting in locations where the ambient
temperature drops below 0C (32F). The carburetor
heater prevents condensation and carburetor icing. The
heater requires a continuous source of 120 VACpower.
See the generator set Installation manual for more
information.
1.6.2 OnCue Home Generator
Management System
The Kohler OnCue Home Generator Management
System allows monitoring and control of your RES or
RESL generator set from a personal computer located
in your home or at other remote locations. OnCue can
also be configured to send email or text message
notifications in the event of a generator set fault.
Note: Be sure to obtain the correct version of the
OnCue kit for the RDC/DC controller.
OnCue version 3.0 with the Ethernet option board is
required for RES/RESL generator sets equipped with
the RDC/DC controller. Earlier versions of the OnCue
kit are not compatible with the RDC/DC controller.
TP-6734 5/1016 Section 1 Descriptions and Service Views
1.7 Service Views for Maintenance
25 12REAR VIEW
23
18
19
24
17
14
AIR INTAKE SIDE --PANELREMOVED TO SHOW DETAIL
1
23
10
4
9
11
ADV-7876
8
5
13
1. Muffler (located below cover plate)
2. Oil check dipstick3. Air cleaner
4. Oil filter
5. RDC or DC controller6. Fuses
7. USB connector (for firmware updates)
8. Line circuit breaker
9. Oil fill10. Oil drain valve
11. Exhaust outlet
12. Air intake13. Lifting holes
14. Field-connection terminal block location
15. Digital spark advance ignition (DSAI) leads16. Fuel solenoid valve
17. Oil drain hose
18. Engine starting battery location (battery purchased separately)19. Battery cables
20. Battery charger location (charger not shown)
21. 120 VAC receptacles for battery charger and optional carburetor
heater (not shown)22. Nameplate location
23. Gas regulator assembly
24. Fuel block or LP orifice location (inside hose fitting)25. Fuel inlet
12
FRONT VIEW
TOP VIEW -- ROOFREMOVED TO SHOW DETAIL
6, 7
15, 16
22
20, 21
10
Figure 1-2 Generator Set Components
TP-6734 5/10 17Section 2 Operation
Section 2 Operation
2.1 Prestart Checklist
To ensure continued satisfactory operation, perform the
following checks or inspections before or at each
startup, as designated, and at the intervals specified in
the service schedule. In addition, some checks require
verification after the unit starts.
Air Cleaner. Check for a clean and installed air cleaner
element to prevent unfiltered air from entering the
engine.
Air Inlets. Check for clean and unobstructed air inlets.
Battery. Check for tight battery connections. Consult
the battery manufacturer’s instructions regarding
battery care and maintenance.
Exhaust System. Check for exhaust leaks and
blockages. Check the muffler condition.
Inspect the exhaust system components for cracks,
leaks, and corrosion. Check for tight exhaust system
connections.
Check for corroded or brokenmetal parts and replace
them as needed.
Check that the exhaust outlet is unobstructed.
Oil Level. Check the oil level before starting the
generator set and at the intervals given in Section 3,
Scheduled Maintenance. Maintain the oil level at or
near, not over, the full mark on the dipstick.
Operating Area. Check for obstructions that could
block the flow of cooling air. Keep the air intake area
clean. Do not leave rags, tools, or debris on or near the
generator set.
2.2 Exercising the Generator Set
Operate the generator set without load once each week
for 20 minutes. If the generator set is connected to a
Kohlermodel RRT transfer switch, a weekly ultra-quiet
diagnostic test/exercise can be set to run automatically.
See Section 2.7 for instructions to set the exerciser.
If the generator set is connected to a Kohler model
RDT or RSB transfer switch, refer to the transfer switch
instructions to set the automatic exercise function. If the
generator set is not connected to an automatic transfer
switch (ATS) with an exercise option, run the unit in the
presence of an operator.
The operator should perform all of the prestart checks
before starting the exercise procedure. Start the
generator set according to the starting procedure in the
controller section of this manual. While the generator
set is operating, listen for a smooth-running engine and
visually inspect the generator set for fluid or exhaust
leaks. Check the air inlets and outlets and remove any
items restricting the air flow.
2.3 RDC and DC Generator Set/
Transfer Switch Controllers
RES model generator sets are equipped with the
Residential Digital Control (RDC). The RDC controls
the power system generator set and model RRT
automatic transfer switch (ATS) (if equipped). The
controller receives voltage sensing data from the ATS
and operates the generator set and transfer switch to
provide standby power when utility power is lost.
If the generator set is not connected to a Kohlermodel
RRT ATS, the RDC/DC controller functions as a
generator set controller only. ATS communication and
functions do not operate with other ATS models. The
ultra-quiet diagnostic test/exercise is not available with
other ATS models.
2.4 Controller Power
The RDC and DC controllers are powered by the
generator set engine starting battery.
Note: The generator sets are equipped with factory-
installed battery chargers to prevent battery
discharge. The battery charger must be
connected to utility power.
TP-6734 5/1018 Section 2 Operation
2.5 Controls and Indicators
Figure 2-1 illustrates the RDC and DC controller user
interfaces.
1. LED display
2. Up button (RDC only)3. Select button (RDC only)
4. Down/Exercise button (RDC)
5. Exercise button (DC)
6. Service access (see Section 4.2)
7. RUN button and LED8. AUTO button and LED
9. OFF button and LED
1
9
3
2
7
8
6
4
1
9
7
8
6
5
Residential Digital Controller (RDC) Digital Controller (DC)
Figure 2-1 RDC and DC Controls and Indicators
TP-6734 5/10 19Section 2 Operation
2.5.1 LED Display
When the system is in AUTOand the generator set is not
running, the LED display shows the engine run time
hours. During cranking, the display shows the crank
cycle information.
When the generator is running, the display steps
through the status messages shown in Figure 2-2, as
applicable. The generator set must be connected to a
model RRT transfer switch for the utility voltage display.
When a fault or warning condition exists, the controller
will show the respective message. The following table
shows the various generator conditions and expected
display or messages.
Generator set is running.
Model RRT transfer switch is required for utility voltage
display.
Display steps through the parameters in sequence for
2 seconds each.
tp6734
Engine RuntimeXXX.X or XXXX hours
Utility VoltageUXXX VAC
Engine TemperaturetXXX
Battery VoltagebXX.X VDC
Generator VoltageEXXX VAC
Test or exercise mode,if applicable.
tnLd, t LD, EnLd, or E Ld
Figure 2-2 Data Displays, Generator Running
Display Description
Blank (dark) Controller is off.
u#.# Controller software version number
XXX.X Engine hours to 999.9
XXXX Engine hours, 1000 to 9999
bXX.X Battery voltage
tXX.X Engine temperature
UXXX Utility voltage
EXXX Generator voltage
tnLd Test, no load
t Ld Test, loaded
EnLd Exercise, no load
E Ld Exercise, loaded
CC1, 2, or 3 Engine crank cycle 1, 2, or 3. Flashesduring crank pause.
Fault code Warning or fault. See Figure 2-7.
Figure 2-3 RDC Controller Display
2.5.2 Controller Keypad
TheRun,Off, Auto, andDown arrowor Exercise buttons
control the generator set as described in Figure 2-4.
See Section 2.6 for operation instructions.
RDC controller only: The Select, Up, and Down
buttons on the controller keypad are used to adjust the
controller parameters. The system configuration and
performance is factory-set and should not require
changes under normal operating conditions. To prevent
inadvertent changes, a pass code is required to access
the controller parameter settings. Contact an
authorized distributor/dealer or service technician if
adjustments are required.
TP-6734 5/1020 Section 2 Operation
Button Button Function
RUN Starts the generator set. The engine starttime delay is ignored.
OFF Shuts down the generator set. Thecooldown time delay is ignored.
During the engine crank cycle, pressingOFF will stop the crank cycle.
Press and hold for 3 seconds to view eventhistory. See Section 2.11.
AUTO Places the generator set in Auto mode.See Figure 2-5.
DOWNarrow(RDC) orEXERCISE(DC)
Starts an unloaded exercise. Press duringtest or exercise to change from unloaded toloaded.
Select RDC only. Used to change parametersettings. Password-protected. Contactyour distributor/dealer if necessary.UP arrow
Figure 2-4 Pushbutton Operation
2.5.3 LED Indicators
LEDs above the RUN, OFF, and AUTO buttons indicate
the mode of operation as shown in Figure 2-5.
Mode LED Indication Description
RUN RUN LED is on The generator set was started by pressing the RUN button. Generator set isrunning. Remote start and stop commands are ignored.
OFF OFF LED lights for 2seconds, then flashesevery 2 seconds.
The OFF button was pressed. Generator set and controller are off. Remotestart/stop commands have no effect.
AUTO AUTO LED is on Automatic mode. Generator set will respond to engine start and stop commandsfrom the controller or an ATS. Time delays operate as described in Section 2.6.
Figure 2-5 Operation Modes and LED Indicators
TP-6734 5/10 21Section 2 Operation
2.6 Generator Set Operation
2.6.1 Engine Start Crank Cycle
The controller attempts to start the generator set three
times (three crank cycles, 15 seconds crank and
15 seconds off). See Figure 2-3 for display information
during the crank cycle. If the generator set does not start
in three attempts, the system shuts down on an
overcrank fault. See Section 2.9.
Pressing the OFF button during the crank cycle stops
the cranking. No other buttons are acknowledged
during the crank cycle.
2.6.2 Local Starting and Stopping
Start
Press theRUNbutton to immediately start the generator
set. The engine start time delay will be ignored.
The controller attempts to start the generator set three
times. If the generator set does not start in three
attempts, the system shuts down on an overcrank fault.
See Section 2.9.
Stop
1. Run the generator set with no load for at least
2 minutes to ensure adequate engine cooldown.
2. Press the OFF button. The engine stops.
2.6.3 Automatic Operation with Model
RRT Transfer Switch
Themodel RRT transfer switch connects to theRDC/DC
controller through the ATS interface board on the
transfer switch. Also see Section 2.10, Model RRT
Transfer Switch Operation.
The controller must be in AUTOmode. Press the AUTO
button to put the controller into automatic mode.
Automatic Start
The RDC/DC controller receives utility source voltage
sensing data from the model RRT transfer switch.
1. If the utility source voltage falls below an
acceptable level, the controller starts the engine
start time delay.
2. If the utility source is not restored before the time
delay expires, the generator set starts.
3. After the Normal-to-Emergency time delay, the
ATS is signaled to transfer the load to the
emergency source.
Automatic Stop with Engine Cooldown
1. When the utility source is restored, the
Emergency-to-Normal time delay starts.
2. When the Emergency-to-Normal time delay
expires, the load is transferred to the utility.
3. The controller runs the generator set for the
cooldown time and then stops the generator set.
2.6.4 Automatic Operation with Model
RDT or RSB Transfer Switches
If a Kohler Model RDT or RSB transfer switch is used,
the engine start contacts from the ATS must be
connected to engine start leads 3 and 4 on the generator
set.
The controller must be in AUTO mode to respond to
remote start/stop signals from an ATS or remote switch.
Press the AUTO button to put the controller into
automatic mode.
Automatic Start
The engine start contacts on the ATS close to signal the
generator set to start, and remain closed while the
generator set is running.
Automatic Stop
Open the contact across engine start leads 3 and 4 to
signal the generator set to stop.
TP-6734 5/1022 Section 2 Operation
2.7 Exercise
A power system that includes a model RES or RESL
generator set and a model RRT transfer switch can be
set to automatically run the generator set at the same
time and day each week. Exercising the generator set
weekly is required in order to keep the engine and
alternator in good operating condition.
Follow the instructions in this section to start a 20-minute
exercise run and set the exerciser to run at the same
time every 7 days.
Note: These instructions apply to systems that have a
Kohlermodel RRT transfer switch connected to
the RDC/DC controller.
If a model RDT or RSB transfer switch is used with the
generator set, refer to the instructions provided with the
transfer switch to set the exerciser.
2.7.1 Unloaded Exercise with
Diagnostic Test
An unloaded exercise runs the generator set without
signalling the transfer switch to transfer the electrical
load from the utility source to the generator set. To start
an unloaded, ultra-quiet diagnostic test, the controlmust
be in the AUTO mode with the AUTO LED ON and the
Utility power available.
1. Press the down arrow button (RDC) or exercise
button (DC) to initiate the engine start signal.
2. The generator begins its crank cycles. During the
crank cycles CCn appears on the display. No
button presses are acknowledged during the crank
cycles.
3. EnLd appears on the display once the generator is
running. The generator runs at low speed. The
AUTO LED will be illuminated. The controller
monitors the system during the unloaded exercise
as described in Section 2.7.2, Low Speed
Diagnostics.
4. The generator runs at low speed for 20minutesand
then shuts down.
Note: If the engine temperature has risen to 104C
(219F) or higher, the unit will run at full
speed for 5 minutes to allow engine
cooldown before shutting down.
The exercise time is set to the time the down arrow or
exercise button was pressed. An unloaded, ultra-quiet
diagnostic test will occur at the same time every seven
days.
2.7.2 Low-Speed Diagnostics
During the unloaded diagnostic test, the controller
monitors the following data. The controller display
indicates an unloaded exercise run (EnLd) during the
diagnostics, unless a fault is detected as described
below.
Battery voltage. If the controller detects low battery
voltage, a low battery warning is indicated and the
exercise does not start.
Generator output frequency and voltage. The
controller verifies that the voltage and frequency are
within acceptable limits for the run speed.
ATSconnection. The controller verifies that the ATS
interface board, if connected, remains connected. An
ATS Communication Lost fault will be displayed if the
connection is lost.
Oil pressure. The controller verifies the engine oil
pressure during low speed operation.
2.7.3 Loaded Exercise
A loaded test or exercise starts the generator set and
then transfers the electrical load from the utility source to
the generator set. The load is transferred back to the
utility source before the generator set shuts down.
To start a loaded full-speed exercise, the control must be
in the AUTO mode with the AUTO LED on and utility
power must be available.
1. Press the down arrow button (RDC) or the exercise
button (DC) to initiate the engine start signal.
2. The generator begins its crank cycles. During the
crank cycles CCn appears on the display. No
button presses are acknowledged during the crank
cycles.
3. EnLd appears on the display once the generator is
running. The AUTO LED will be illuminated. The
generator is running at low speed with no load.
4. Press the down arrow button (RDC) or exercise
button (DC) a second time. The generator ramps
up to normal operating speed (typically 3600 RPM)
and the ATS transfers the load.
5. E Ld appears on the display. The AUTO LED is
illuminated. The generator runs at normal
operating speed for twenty minutes with load.
TP-6734 5/10 23Section 2 Operation
6. After 20minutes, the ATS transfers the load back to
utility power. The engine runs for the cooldown
cycle and then shuts down.
The exercise time is set to the time the down arrow
button (RDC) or exercise button (DC) was initially
pressed. A loaded, full-speed exercise will occur at the
same time every seven days.
2.7.4 Exerciser Reset and Disable
To reset the exerciser to run at a different day and/or
time, or to switch between a loaded and unloaded
exercise, follow the procedures above to start an
unloaded or loaded exercise on the desired time and
day. The previous exercise setting is replaced by the
new time, day, and loaded or unloaded condition.
To disable the exerciser, press and hold the OFF and
DOWN arrow or EXERCISE buttons together for
3 seconds.
2.7.5 Power Failure During Exercise
Cycle
If the utility power is lost during an unloaded exercise,
theATS transfers to the emergency source, the exercise
is ended and the control remains in the AUTO mode.
If the utility power is lost during a loaded exercise, the
exercise is ended. The ATS remains in the emergency
position and the control goes into the AUTO mode.
WhenUtility power is restored, the ATSwill re-transfer to
the utility source through normal timing sequences.
2.8 Test
An operator can use the buttons on the RDC/DC
controller to test the generator set and transfer switch
(model RRT only) operation at any time. Unlike the
exercise function, a test does not start or stop
automatically. The operator must use the RDC/DC
controller to start and stop the test. Follow the
instructions below to run an unloaded or loaded test.
2.8.1 Unloaded Test
An unloaded test runs the generator set without
signalling the transfer switch to transfer the electrical
load from the utility source to the generator set.
Press the RUN button to start an unloaded test. The
engine cranks and starts. tnLd appears on the display
once the generator is running. The RUN LED is
illuminated. The engine runs at normal operating speed
(3600 RPM) during the test sequence.
Pressing the OFF button during the crank cycle stops
the cranking. No other buttons are acknowledged
during the crank cycle.
There are two ways to end an unloaded test:
Press the AUTO button to shut down the generator
set and enter AUTO mode.
Press the OFF button to shut down the generator set.
The cooldown time delay is ignored.
Figure 2-6 describes the effect of pressing the buttons
during a test, with the engine running and no active
faults.
Button
Press Response
AUTO Shuts down the engine, through normaltiming sequences, and goes to the AUTOmode. AUTO LED turns ON. RUN LEDturns OFF.
OFF Ends the test and shuts down thegenerator. The cooldown time delay isignored when a test is ended. The RUNLED turns OFF. The OFF LED turns ONand then flashes every 2 seconds.
RUN No effect.
DOWNarrow/EXERCISE
Causes the ATS to transfer to theemergency source. The display indicates aLoaded Test, t Ld.
Figure 2-6 Button Function During Test
2.8.2 Loaded Test
A loaded test starts the generator set and then signals
the model RRT transfer switch to transfer the electrical
load from the utility source to the generator set. The load
is transferred back to the utility source before the
generator set shuts down.
To run a loaded test:
1. Press the RUN button to start an unloaded test as
described in Section 2.8.1. tnLd appears on the
display once the generator is running.
2. Press the down arrow button (RDC) or the exercise
button (DC) to signal the ATS to transfer the load.
The display indicates a loaded test, t Ld.
3. To end the test, press the AUTO button to shut
down the generator set through normal timing
sequences. The engine cooldown cycle runs
TP-6734 5/1024 Section 2 Operation
before the generator set engine stops. The
generator set goes into Auto mode.
Immediate Shutdown During a Loaded Test
Press the OFF button to shut the generator set down
immediately, if necessary. The cooldown time delay is
ignored, and the controller goes to OFF mode. The
controller signals the RRT transfer switch to transfer the
load back to utility power.
Note: Running the generator set with no load for at least
2 minutes is recommended to ensure adequate
engine cooldown. Use the OFF button to stop a
loaded test only if necessary.
2.8.3 Power Failure During Test Cycle
If the utility power is lost during an unloaded test, the
ATS transfers to the emergency source and the test is
ended. The control goes into the AUTO mode.
If the utility power is lost during a loaded test, the test is
ended and the ATS remains in the emergency position.
The control goes into the AUTO mode.
When Utility power is restored, the ATS re-transfers to
the utility source through normal timing sequences.
2.9 Faults
Fault conditions are shown in Figure 2-7. Fault
conditions are classified as warnings or shutdowns.
2.9.1 Warnings
The controller displays a fault code but the generator set
does not shut down on a warning. The controller resets
automatically after a warning condition is corrected.
2.9.2 Shutdowns
Under a fault shutdown condition, the generator set
shuts down automatically and the controller displays a
fault code. In some cases, the engine cooldown cycle
runs before the engine shuts down. See Figure 2-7.
Shutdown switches (such as the low oil pressure switch
or high engine temperature switch) on the generator set
will automatically reset when the problem is corrected.
However, the fault condition at the controller does not
clear until the controller is reset.
The generator set cannot be restarted until the fault
condition is corrected and the controller is reset. See
Section 2.9.4 to reset the controller after a fault
shutdown.
2.9.3 ATS Communication Errors
An ATS fault can be caused by two conditions.
When a model RRT transfer switch is used, an ATS
fault indicates that communication with the interface
board on the transfer switch has been lost. The
generator set shuts down. Check the connection to
the ATS interface board.
When a model RDT or RSB transfer switch is used,
an ATS fault indicates that connection to the ATS
interface board is detected when it is not expected. A
warning is displayed but the generator set does not
shut down.
2.9.4 Resetting the Controller after a
Fault Shutdown
Always identify and correct the cause of a fault
shutdown before resetting the controller. Check the
fault code displayed on the controller and refer to
Figure 2-7 to identify and correct the fault condition
before proceeding. Contact an authorized
distributor/dealer for service, if necessary.
Procedure to Reset the Controller after a Fault
Shutdown
1. Press OFF to turn off the generator set.
2. Disconnect the generator set from the load using
the line circuit breaker or ATS. See the safety
precautions at the beginning of this manual before
proceeding.
3. Identify and correct the cause of the fault
shutdown. See the safety precautions at the
beginning of this manual before proceeding. Refer
to Section 4, Troubleshooting.
4. Start the generator set by pressing RUN. Check
the generator set operation to verify that the cause
of the shutdown has been corrected.
5. Press the OFF button to stop the generator set.
6. Reconnect the generator set to the load using the
line circuit breaker or ATS.
7. Press AUTO to put the generator set into automatic
mode.
TP-6734 5/10 25Section 2 Operation
Code Fault
Warning (W) or
Shutdown (SD) Condition Check
AF Auxiliary faultinput
SD * An optional customer-connected input isclosed.
Check customer-supplied equipment.
HE High enginetemperature
SD * Engine coolant temperature exceeds themaximum temperature for more than5 seconds. Function becomes activeafter crank disconnect.
Check for blocked air inlets andexhaust outlets.
LOP Low oilpressure
SD * The LOP switch indicates low oilpressure for more than 5 seconds.Function becomes active 30 secondsafter crank disconnect (30 secondinhibit).
Note: The low oil pressure shutdowndoes not protect against low oil level.Check the engine oil level regularly asrecommended in Section 3.
Check for leaks in the lubricationsystem.
Check the oil level and add oil if thelevel is low.
OC Overcrank SD Three unsuccessful starting attempts. Check the fuel supply, spark plug,and battery.
Check for loose connections.
Contact an authorizeddistributor/dealer for service.
Lr Locked rotor SD No engine rotation is sensed duringcranking. Shuts down 3 seconds afterthe fault is detected.
OF Overfrequency SD * Governed frequency exceeds 110% ofthe system’s frequency setpoint for morethan 5 seconds. Function becomesactive 10 seconds after engine start(10 second inhibit).
Contact an authorizeddistributor/dealer for service.
OS Overspeed SD * Engine speed exceeds 115% of thenormal running speed for more than0.3 seconds.
Contact an authorizeddistributor/dealer for service.
US Underspeed SD * Engine speed drops below 85% of thenormal running speed for more than0.3 seconds.
Reduce the load.
Contact an authorizeddistributor/dealer for service.
OU Overvoltage SD * Output voltage exceeds 120% of thesystem nominal voltage for more than2 seconds.
Contact an authorizeddistributor/dealer for service.
UF Underfrequency SD * Governed frequency falls below 90% ofthe system frequency setting for morethan 5 seconds, or 1 Hz below thesystem frequency setting for more than60 seconds.
Function becomes active 10 secondsafter engine start. (10 second inhibit).
Reduce the load and restart thegenerator set.
Contact an authorizeddistributor/dealer for service.
UU Undervoltage SD * Output voltage falls below 80% of thenominal system voltage for more than10 seconds.
Reduce the load and restart thegenerator set.
Contact an authorizeddistributor/dealer for service.
HB High batteryvoltage
W Engine starting battery voltage risesabove 125% of the battery voltage settingfor more than 10 seconds when theengine is running. Not operative duringthe engine crank cycle.
Clears when the battery voltage returnsto an acceptable level.
Check the battery rating andcondition.
Check the battery charger operation.
* Engine cooldown runs before shutting down.
(continued on next page)
TP-6734 5/1026 Section 2 Operation
Code Fault
Warning (W) or
Shutdown (SD) Condition Check
LB Low batteryvoltage
W Engine starting battery voltage falls belowthe battery voltage setting (typically12 volts) for more than 90 seconds whenthe engine is not running. Not operativeduring the engine crank cycle.
Clears when the battery voltage returnsto an acceptable level.
Check the battery rating andcondition.
Check the battery charger operation.
Charge or replace the battery.
SS Speed sensorfailure
SD Engine speed sensor has failed. Contact an authorizeddistributor/dealer for service.
AC Loss of ACsensing
W (1 sec.)
SD (3 sec.) *
Generator output AC sensing is lost.Starts 10 seconds after crank disconnect.
Warning: after 1 second if no outputdetected after crank disconnect.
Fault: after 3 seconds if voltage waspresent and then lost.
Contact an authorizeddistributor/dealer for service.
LCB Low crankingvoltage
W Battery voltage falls below 60% ofsystem battery voltage for more than 6seconds while the starter is engaged.
Charge or replace the battery.
ATS ATScommunicationerror
SD (RRT) *
W (other ATS)
RRT: Shutdown if ATS interfaceconnection is lost.
Other ATS: Warning is displayed if ATSinterface board is connected when it isnot expected.
See Section 2.9.3.
Check connection to model RRTtransfer switch interface board.
LrC Loss of voltageregulatorcommunication
SD * No communication between controllerand voltage regulator.
Contact an authorizeddistributor/dealer for service.
* Engine cooldown runs before shutting down.
Figure 2-7 Controller Fault Codes
TP-6734 5/10 27Section 2 Operation
2.10 Model RRT Transfer Switch
Operation
The RDC/DC generator set/transfer switch controller
manages automatic transfer switch (ATS) functions
when connected to aKohlermodelRRT transfer switch
through the ATS interface board.
2.10.1 Source Availability
The Model RRT transfer switch supplies voltage
sensing data to the RDC/DC controller through the ATS
interface board. If the source voltage falls below the
undervoltage dropout setting, the source is considered
to have failed. See Figure 2-8.
Item Setting
Accuracy ±5%
Undervoltage Dropout 90% of Pickup
Undervoltage Pickup 90% of Nominal
Figure 2-8 Voltage Sensing Parameters
2.10.2 ATS Control Sequence of
Operation
See Figure 2-9 for time delay settings.
Preferred Source Fails:
1. The load control contact opens.
2. The engine start time delay times out.
3. The generator set is signaled to start.
4. The generator starts and the emergency source
becomes available.
5. The normal-to-emergency time delay times out.
6. The transfer switch transfers to the emergency
source.
7. The load control contact time delay times out.
8. The load control contact closes.
Normal Source Returns:
1. The emergency-to-normal time delay times out.
2. The contactor transfers to the normal source.
3. The engine cooldown time delay times out.
4. The generator is signaled to stop.
2.10.3 Time Delays
Time delays are factory-set to the values shown in
Figure 2-9. An authorized distributor/dealer can adjust
time delays using a personal computer and Kohler
SiteTech software.
Time delays described in this section operate only when
the controller is connected to a Kohler model RRT
transfer switch.
Time Delay Setting Description
Engine Start 3 seconds Time delay after utility source is lost until the engine start cycle begins.Guards against starting the generator set because of a brief change inthe utility source.
Transfer, Normal to Emergency 3 seconds Time delay after emergency source becomes available until transfer toemergency source.
Transfer, Emergency to Normal 2 minutes Time delay after the utility source returns until transfer back to normal.Ensures that the the utility source is stable before transferring from theemergency source.
Load Control 5 minutes Allows delayed connection of selected loads to the generator set.Prevents simultaneous starting of large motors after transfer to theemergency source. Recommended for delayed starting of airconditioners.
Engine Cooldown 5 minutes Runs the engine with no load after transfer from the generator set.Engine stops before the time delay expires if the temperature dropsbelow the cooled-down temperature level, or if the temperature risesduring the cooldown cycle.
Figure 2-9 Time Delays
TP-6734 5/1028 Section 2 Operation
2.10.4 Engine and Transfer Time Delays
The engine start and transfer time delays prevent
engine start and load transfer caused by brief variations
in the utility power source.
The engine cooldown time delay allows the engine to
run after the loads have been removed. The engine
stops before the cooldown time delay expires if the
temperature drops below the cooled-down temperature
level, or if the temperature rises during the cooldown
cycle.
2.10.5 Load Control Time Delay
The load control time delay allows delayed starting of
large motor loads (such as air conditioners), preventing
simultaneous starting of large motors after transfer to
the generator set. The load control time delay is fixed at
5 minutes. It is not adjustable.
The load must be connected to the load control output
on the interface board of the model RRT transfer switch.
See the transfer switch operation and installation
manual for connection instructions.
2.11 Event History
The last ten controller faults can be viewed from the
controller display when the controller is off. Each event
is displayed with the fault code followed by the engine
hours at which time the event occurred. During event
history viewing, the OFF LED flashes once per second.
Procedure to View Event History
1. Press and hold the OFF button for 3 seconds. The
first event appears on the screen. The OFF LED
flashes once per second.
2. Press the OFF button to cycle through the engine
hours and subsequent events. After cycling
through all ten events, the control automatically
turns off. The OFF LED flashes once every 2
seconds.
To stop viewing the event history before the last event,
press the down arrow or exercise button. The controller
will turn off.
TP-6734 5/10 29Section 3 Scheduled Maintenance
Section 3 Scheduled Maintenance
Accidental starting.Can cause severe injury or death.
Disconnect the battery cables beforeworking on the generator set.
Remove the negative (--) lead firstwhen disconnecting the battery.Reconnect the negative (--) lead lastwhen reconnecting the battery.
WARNING
Disabling the generator set. Accidental starting cancause severe injury or death. Before working on thegenerator set or connected equipment, disable the generatorset as follows: (1) Move thegenerator setmaster switch to theOFFposition. (2) Disconnect thepower to thebattery charger.
(3) Remove the battery cables, negative (--) lead first.Reconnect the negative (--) lead last when reconnecting thebattery. Follow these precautions to prevent starting of thegenerator set by an automatic transfer switch, remotestart/stop switch, or engine start command from a remote
computer.
Hazardous voltage.Can cause severe injury or death.
Operate the generator set only whenall guards and electrical enclosures
are in place.
Moving parts.
WARNING
Hot engine and exhaust system.Can cause severe injury or death.
Do not work on the generator set untilit cools.
WARNING
Servicing the exhaust system. Hot parts can causesevere injury or death. Do not touch hot engine parts. Theengine and exhaust system components become extremelyhot during operation.
3.1 Scheduled Maintenance
Refer to the following service schedules and the runtime
hours displayed on the controller display to schedule
routine maintenance. Intervals are shown in hours of
operation and/or time intervals (i.e. weekly, monthly,
quarterly, etc.) Have an authorized distributor/dealer
service the generator set at the designated intervals in
the service schedule for the life of the generator set.
Service units subject to extremeweather, long operating
hours, or dusty or dirty conditions more frequently.
Contact an authorized distributor/dealer for parts.
TP-6734 5/1030 Section 3 Scheduled Maintenance
3.1.1 Service Schedule, 14RES/RESL Models
System Component or ProcedureSee
Section
Procedure
Frequency
VisuallyInspect Check Change Clean Test
Fuel
Flexible lines and connections X R Quarterly
Main tank supply level X Weekly
Fuel piping X Yearly
Lubrication 3.2
Oil levelX X
8 hours orbefore use
Crankcase breather hose X Yearly or 500 hours
Change oil X Yearly or 100 hours
Replace filter X Yearly or 200 hours
Cooling 3.5
Air ducts, louvers X X Yearly
Exhaust Line 3.6
Leakage X X Weekly
Insulation, fire hazards X Yearly
Obstructions or combustible materials near exhaustoutlet
X Weekly
DC Electrical System 3.7
Battery charger operation, charge rate (if equipped) X Monthly
Remove corrosion, clean and dry battery and rack X X Yearly
Clean and tighten battery terminals and inspectboots
X X Yearly
Battery electrolyte level and specific gravity * X Yearly
AC Electrical System
Tighten control and power wiring connections X Yearly
Remote control system, if equipped X Monthly
Visible wear or damage X Quarterly
Wire abrasions where subject to motion X X Six Months
Wire-cable insulation condition X 3 Years or 500 hours
Engine and Mounting
Visible wear or damage X Weekly
Air cleaner and precleaner service 3.4 R Yearly or 100 hours
Spark plugs 3.3 X Yearly or 300 hours
Replace stepper motor coupling and bushing D 500 hours
Generator
Visible wear or damage X Quarterly
Exercise generator set X Weekly
Brushes and collector ring D D Yearly
Measure and record resistance readings ofwindings with insulation tester (Megger, withSCR assembly or rectifier and load leadsdisconnected) *
D 3 Years
General Condition of Equipment
Evidence of vibration, leakage, excessive noise,temperature, or deterioration
X X X Weekly
Interior of sound enclosure X X Quarterly
* Not necessary for maintenance-free batteries.
Service more frequently under extremely dusty/dirty conditions.
Megger is a registered trademark of Biddle Instruments.
X Action
D Authorized distributor/dealer onlyR Replace as necessary
TP-6734 5/10 31Section 3 Scheduled Maintenance
3.1.2 Service Schedule, 20RES/RESL Models
System Component or ProcedureSee
Section
Procedure
Frequency
VisuallyInspect Check Change Clean Test
Fuel
Flexible lines and connections X R Quarterly
Main tank supply level X Weekly
Fuel piping X Yearly
Lubrication 3.2
Oil level X 8 hours orbefore each use
Change oil X Yearly or 150 hours
Replace filter X Yearly or 150 hours
Crankcase breather hose X Yearly or 500 hours
Oil cooler X X Yearly or 100 hours
Cooling 3.5
Air ducts, louvers X X Yearly
Exhaust System 3.6
Leakage X X Weekly
Insulation, fire hazards X Yearly
Obstructions or combustible materials nearexhaust outlet
XWeekly
DC Electrical System 3.7
Battery charger operation, charge rate X Monthly
Remove corrosion, clean and dry battery andrack
X XYearly
Clean and tighten battery terminals and inspectboots
X XYearly
Battery electrolyte level and specific gravity * X Yearly
AC Electrical System
Tighten control and power wiring connections X Yearly
Remote control system, if equipped X Monthly
Visible wear or damage X Quarterly
Wire abrasions where subject to motion X X Six Months
Wire-cable insulation condition X 3 Years or 500 hours
Engine and Mounting
Visible wear or damage X Weekly
Air cleaner service 3.4 150 300 Yearly or hours shown
Spark plugs 3.3 150 300 Yearly or hours shown
Replace stepper motor coupling and bushing D 500 hours
Generator
Visible wear or damage X Quarterly
Exercise generator set W Weekly
Brushes and collector ring D D Yearly
Measure and record resistance readings ofwindings with insulation tester (Megger, withSCR assembly or rectifier and load leadsdisconnected)
D 3 Years
General Condition of Equipment
Evidence of vibration, leakage, deterioration,unusual or excessive noise or temperature
X X X Weekly
Interior of sound enclosure X X Quarterly
* Not necessary for maintenance-free batteries.
Service more frequently under extremely dusty/dirty conditions.
Megger is a registered trademark of Biddle Instruments.
X Action
D Authorized distributor/dealer onlyR Replace as necessary
TP-6734 5/1032 Section 3 Scheduled Maintenance
3.2 Lubrication System
See the service schedules in Section 3.1 for oil change
and oil filter replacement intervals. See the service
views in Section 1.7 for the oil drain, oil check, oil fill, and
oil filter locations.
3.2.1 Low Oil Pressure Shutdown
The low oil pressure (LOP) shutdown feature protects
the engine against internal damage if the oil pressure
drops below a minimum pressure because of oil pump
failure or other malfunction.
Note: The LOP shutdown feature does not protect
against damage caused by operating when the
oil level is low; it is not a low oil level shutdown.
Check the oil level regularly, and add oil as
needed.
3.2.2 Oil Check
The generator set is shipped with oil. Before operating
the generator set, check the engine oil in the crankcase.
See Figure 3-1.
Maintain the oil level at or near, not over, the full mark on
the dipstick. Add 5W-30 synthetic oil when the oil level is
low.
Check the oil level before each use. For extended
operation, check the oil level every 8 hours. Do not
check the oil level when the generator set is running.
Shut down the generator set and wait several minutes
before checking the oil.
6515
Figure 3-1 Oil Check (typical)
3.2.3 Engine Oil Recommendation
Use 5W-30 API (American Petroleum Institute) Service
Class SG, SH, or SJ synthetic oil. Synthetic oil oxidizes
and thickens less than other oils and leaves the engine
intake valves and pistons cleaner.
3.2.4 Oil Change Procedure
Note: Dispose of all waste materials (engine oil, fuel,
filter, etc.) in an environmentally safe manner.
Drain the oil while it is still warm.
1. Drain the oil.
a. Press the OFF button on the generator set
controller.
b. Disconnect the power to the battery charger.
c. Disconnect the generator set engine starting
battery, negative (--) lead first.
d. Remove the housing side panel.
e. Clean the area around the dipstick and oil fill
cap.
f. Remove the oil drain hose from its retaining
clip. Remove the cap from the oil drain hose
and lower the hose into an oil collection
container.
g. Open the oil drain valve on the engine.
h. Remove the dipstick and oil fill cap. Allow time
for the engine oil to drain completely.
i. Close the oil drain valve. Replace the cap on
the oil drain hose. Replace the oil drain hose in
its retaining clip.
j. Replace the dipstick.
2. Replace the oil filter.
a. Clean the area around the oil filter. Remove the
oil filter by rotating it counterclockwise with an
oil filter wrench.
b. Clean the gasket sealing surface of the oil filter
adapter.
c. Apply a light coat of clean oil to the rubber seal
of the new oil filter.
d. Install the new oil filter following the instructions
provided with the filter.
TP-6734 5/10 33Section 3 Scheduled Maintenance
3. Fill with oil.
a. Fill the engine to theFmarkon thedipstick. The
engine oil capacity is shown in Figure 3-2. See
Section 3.2.3, Engine Oil Recommendation,
for oil selection.
Generator Set Model Oil Capacity, L (qt.)
14RES/RESL 1.9 (2.0)
20RES/RESL 2.8 (3.0)
Figure 3-2 Engine Oil Capacity
b. Reinstall the dipstick and the oil fill cap.
c. Check that the generator set master switch is in
the OFF position.
d. Reconnect the generator set engine starting
battery, negative (--) lead last.
e. Reconnect the power to the battery charger.
f. Start and run the generator set for a minute to
allow the oil pressure to reach operating range.
g. Stop the generator set, wait 1 minute, and then
recheck the oil level. Add oil to bring the level
up to the F mark on the dipstick.
4. Check for leaks.
a. Check for oil leaks.
b. Fix leaks and recheck the oil level.
c. Reinstall the housing side panel.
3.2.5 Oil Cooler 20RES/RESL
Inspect and clean the oil cooler at the intervals indicated
in the service schedule. The oil cooler must be kept free
of debris.
See Figure 3-3 for the oil cooler location. The oil cooler
is located under the No. 2 cylinder shroud. Remove the
top mounting screw and loosen the two side screws,
then lift off the cylinder shroud.
Clean the outside of the oil cooler fins with a brush or
with compressed air.
162 590 011. Oil cooler
Figure 3-3 Oil Cooler Location
TP-6734 5/1034 Section 3 Scheduled Maintenance
3.3 Spark Plugs
Reset the spark plug gap or replace the plugs with new
plugs as necessary.
1. Clean the area around the base of the spark plug to
keep dirt and debris out of the engine.
2. Remove the spark plug and check its condition.
Replace the spark plug if it is worn or if its reuse is
questionable.
3. Check the spark plug gap using a wire feeler
gauge. See Figure 3-4 for the recommended
spark plug gap. Adjust the gap by carefully bending
the ground electrode. See Figure 3-5 and
Figure 3-6.
4. Reinstall the spark plug into the cylinder head.
Torque the spark plug to 24.4--29.8 Nm
(18--22 ft. lb.)
Generator Set Model Spark Plug Gap
14/20RES/RESL 0.76 mm (0.030 in.)
Figure 3-4 Spark Plug Gap
1--514
Figure 3-5 Checking the Spark Plug Gap
1--511
Figure 3-6 Adjusting the Spark Plug Gap
3.4 Air Cleaner Service
3.4.1 Air Cleaner, 14RES/RESL Models
The engine has a replaceable high-density paper air
cleaner element with an oiled foam precleaner. See
Figure 3-7.
1
2
3
4
5
6
7
586536
1. Cover knob
2. Air cleaner cover3. Element cover nut
4. Element cover
5. Foam precleaner6. Air cleaner element
7. Air cleaner base
Figure 3-7 Air Cleaner Components
Check for a buildup of dirt and debris around the air
cleaner system. Keep this area clean. Also check for
loose or damaged components. Replace all bent or
damaged air cleaner components.
Note: Operating the engine with loose or damaged air
cleaner components could allow unfiltered air
into the engine causing premature wear and
failure.
Precleaner Service
Use the following procedure to wash and reoil the
precleaner as indicated in the service schedule. Wash
and reoil the precleaner more often under extremely
dusty or dirty conditions.
1. Press the OFF button on the generator set
controller.
TP-6734 5/10 35Section 3 Scheduled Maintenance
2. Disconnect the power to the battery charger.
3. Disconnect the battery, negative (--) lead first.
4. Loosen the cover retaining knob and remove the
cover. Remove the precleaner from the paper
element. Wash the precleaner in warm water with
detergent. Rinse the precleaner thoroughly until all
traces of detergent are eliminated. Squeeze out
excess water (do not wring). Allow the precleaner
to air dry.
5. Saturate the precleaner with new engine oil.
Squeeze out all of the excess oil.
6. Reinstall the precleaner over the paper element.
7. Reinstall the air cleaner cover. Secure the cover
with the cover retaining knob.
8. Reconnect the power to the battery charger.
9. Reconnect the generator set engine starting
battery, negative (--) lead last.
Paper Element Service
Use the following procedure to replace the paper
element at the intervals specified in the service
schedule. Replace the paper element more often under
extremely dusty or dirty conditions.
1. Press the OFF button on the generator set
controller.
2. Disconnect the power to the battery charger.
3. Disconnect the generator set engine starting
battery, negative (--) lead first.
4. Loosen the cover retaining knob and remove the
cover.
5. Remove the element cover nut, element cover, and
the paper element with precleaner.
6. Remove the precleaner from the paper element.
Note: Do not wash the paper element or clean it
with pressurized air, as this will damage the
element.
7. Replace the element if it is dirty, bent, or damaged.
8. Check the air cleaner base. Make sure it is secure
and not bent or damaged. Also check the element
cover for damage and fit. Replace all damaged air
cleaner components. Remove any loose dirt or
debris from the air cleaner base. Wipe the base
carefully so that no dirt drops into the intake throat.
Check the condition of the rubber seal on the air
cleaner stud and replace the seal if necessary.
9. Reinstall the paper element, precleaner, element
cover, element cover nut, and the air cleaner cover.
Secure the cover with the cover retaining knob.
10. Reconnect the power to the battery charger.
11. Reconnect the generator set engine starting
battery, negative (--) lead last.
3.4.2 Air Cleaner, 20RES/RESL Models
The engine is equipped with a replaceable, high density
paper air cleaner element. See Figure 3-8.
1
tp6515
1. Knobs (qty.2)
2. Cover
3. Paper element
4. Air filter latch
3
4
2
Figure 3-8 Air Cleaner Components
Check the air cleaner daily or before starting the engine.
Check for a buildup of dirt and debris around the air
cleaner system. Keep this area clean. Also check for
loose or damaged components. Replace all bent or
damaged air cleaner components.
Note: Operating the engine with loose or damaged air
cleaner components could allow unfiltered air
into the engine causing premature wear and
failure.
TP-6734 5/1036 Section 3 Scheduled Maintenance
Paper Element Service
Replace the paper element at the intervals indicated in
the service schedule. See Section 3.1.2 for the service
schedule. See Figure 3-8 for the air cleaner
components.
1. Loosen the two cover retaining knobs and remove
the cover.
2. Rotate the air filter latch counterclockwise to
unlock, then remove the paper element.
3. Do not wash the paper element or use pressurized
air, as this will damage the element. Replace a
dirty, bent, or damaged element. Handle new
elements carefully; do not use if the sealing
surfaces are bent or damaged.
4. When servicing the air cleaner, check the air
cleaner base and latch.Make sure it is secured and
not bent or damaged. Also, check the element
cover for damage or improper fit. Replace all
damaged air cleaner components.
Note: If any loose dirt or debris fell on the air cleaner
base when the element was removed, carefully
remove it andwipe the base clean. Be careful that
none of it drops into the intake throat.
5. Reinstall the paper element onto the air cleaner
base. Make sure the element is flat and properly
seated. Rotate the latch clockwise, over the
molded lip on the element.
6. Install the air cleaner cover and securewith the two
retaining knobs.
7. When element replacement is necessary, order
genuine Kohler parts.
3.5 Cooling System
The engine fan draws cooling air through the openings
in the sides and end near the battery. The alternator fan
draws cooling air through openings on the side walls of
the enclosure. The cooling air mixes with the engine
exhaust and is discharged at the exhaust outlet. See
Figure 1-2, Service View, for air intake and exhaust
locations. To prevent generator set damage caused by
overheating, keep the housing cooling inlets and outlets
clean and unobstructed at all times.
Note: Do not block the generator set cooling air inlets or
mount other equipment above them. Overheating
and severe generator damage may occur.
3.6 Exhaust System
Remove all combustible materials from the exhaust
location. Combustible materials include building
materials aswell as natural surroundings. Keep dry field
grass, foliage, and combustible landscaping material a
minimum of 1.5 m (5 ft.) from the exhaust outlet.
Periodically inspect the exhaust system components for
cracks, leaks, and corrosion.
Check for corroded or brokenmetal parts and replace
them as needed.
Check that the exhaust outlet is clear.
TP-6734 5/10 37Section 3 Scheduled Maintenance
3.7 Battery
Sulfuric acid in batteries.Can cause severe injury or death.
Wear protective goggles andclothing. Battery acid may cause
blindness and burn skin.
WARNING
Battery electrolyte is a diluted sulfuric acid. Battery acid
can cause severe injury or death. Battery acid can causeblindness and burn skin. Always wear splashproof safetygoggles, rubber gloves, and boots when servicing the battery.Do not open a sealed battery or mutilate the battery case. Ifbattery acid splashes in the eyes or on the skin, immediatelyflush the affected area for 15 minutes with large quantities of
clean water. Seek immediate medical aid in the case of eyecontact. Never addacid to a battery after placing the battery inservice, as this may result in hazardous spattering of batteryacid.
Battery acid cleanup. Battery acid can cause severeinjury or death. Battery acid is electrically conductive and
corrosive. Add 500 g (1 lb.) of bicarbonate of soda (bakingsoda) to a container with 4 L (1 gal.) of water and mix theneutralizing solution. Pour the neutralizing solution on thespilled battery acid and continue to add the neutralizingsolution to the spilled battery acid until all evidence of achemical reaction (foaming) has ceased. Flush the resulting
liquid with water and dry the area.
Battery gases. Explosion can cause severe injury ordeath. Battery gases can cause an explosion. Do not smokeor permit flames or sparks to occur near a battery at any time,particularlywhen it is charging. Donot disposeof abattery inafire. To prevent burns and sparks that could cause an
explosion, avoid touching the battery terminals with tools orother metal objects. Remove all jewelry before servicing theequipment. Discharge static electricity from your body beforetouching batteries by first touching a grounded metal surfaceaway from the battery. To avoid sparks, do not disturb thebattery charger connections while the battery is charging.
Always turn the battery charger off before disconnecting thebattery connections. Ventilate the compartments containingbatteries to prevent accumulation of explosive gases.
Battery short circuits. Explosion can cause severe injuryor death. Short circuits can cause bodily injury and/orequipment damage. Disconnect the battery before generator
set installation or maintenance. Remove all jewelry beforeservicing the equipment. Use tools with insulated handles.Remove the negative (--) lead first when disconnecting thebattery. Reconnect the negative (--) lead last whenreconnecting the battery. Never connect the negative (--)
battery cable to the positive (+) connection terminal of thestarter solenoid. Do not test the battery condition by shortingthe terminals together.
Refer to this section for general battery information and
maintenance. Also consult the battery manufacturer’s
instructions for battery maintenance.
All generator set models use a negative ground with a
12-volt engine electrical system. Consult the generator
set nameplate for the engine electrical system voltage.
Consult the generator spec sheet for battery capacity
recommendations for replacement purposes. Wiring
diagrams provide battery connection information. See
Figure 3-9 for typical battery connections.
EZ-273000-J
1 2
1. To positive (+) terminal on starter solenoid.
2. To ground (--) terminal on or near starter motor.
Figure 3-9 12-Volt Engine Electrical System Single
Starter Motor, Typical Battery Connection
Clean the battery and cables and tighten battery
terminals using the service schedule recommendations.
To prevent corrosion, maintain tight, dry electrical
connections at the battery terminals. To remove
corrosion from battery terminals, disconnect the cables
from the battery and scrub the terminals with a wire
brush. Clean the battery and cables with a solution of
baking soda and water. After cleaning, flush the battery
and cables with clean water and wipe them with a dry,
lint-free cloth.
After reconnecting the battery cables, coat the battery
terminals with petroleum jelly, silicone grease, or other
nonconductive grease.
TP-6734 5/1038 Section 3 Scheduled Maintenance
3.8 Battery Charger
The generator set is equipped with a battery charger to
maintain the engine starting battery. The charger’s DC
leads are factory-wired. Periodically check and tighten
all connections.
3.8.1 RES Battery Charger
RES model generator sets are equipped with a 6-amp
float/equalize battery charger to maintain the engine
starting battery. The charger’s power cord must be
connected to a 120 VAC power source. Figure 3-10
illustrates the battery charger.
The battery charger uses an AGS 10 inline fuse. The
fuse is located in the battery lead. See Figure 3-10.
INDICATOR
Red:
Red & Green:
Green:
VOLTS= 11.8--14.0AMPS= 5.0--6.0
VOLTS= 14.0--14.5AMPS= 1.5--5.0
VOLTS= 13.0--13.6AMPS= 0.1--1.5
CAUTION:To reduce the risk of elect rical shock,connect only to properly grounded outlet.
Allowable Battery Types: Lead Acid a nd Gel Cell
INPUT: 115 VAC 50/60Hz @ 1.6A
OUTPUT: 12 VDC @ 6 Amps
MAX. BAT.: 180 Amp Hr. Max.
DATE:
6 AMP AUTOMATIC
BATTERY CHARGER
RC US LISTEDBATTERYCHARGER
53AB
2608KH
1
1. LED indicators
2. AC power cord3. Fuse
4. Battery leads, 12 VDC
4 2
3
Figure 3-10 6-Amp Float/Equalize Battery Charger
Battery Charger Operation
Figure 3-11 illustrates the three-stage chargingmethod.
Red and green LEDs indicate charger operation. The
chart in Figure 3-12 describes the LED indicator
operation during each stage of the charging process.
See Section 4.4 for battery charger troubleshooting
information, if necessary.
Figure 3-11 Charging Method
Display Operating Condition
Red ONGreenOFF
When the red LED is on, it indicates thebattery is discharged and the battery chargeris recharging at the BULK rate (stage 1).This charging rate is 6 amps. While the redLED is on, the voltage measured (with thebattery charger on) will be 11.8--14 volts.
If the red LED stays on for more than24 hours, refer to Section 4.4 in this manual.
Red ONGreen ON
When both the green and the red LEDs areon, the battery charger is charging at anABSORPTION rate of between 1.5 and 5amps (stage 2). This mode of charginggradually tops off your battery, and reducesharmful sulfating. While both LEDs are on,the voltage measured (with the batterycharger on) should be approximately14.0--14.5 VDC.
If both LEDs stay on longer than 24 hours,refer to Section 4.4 in this manual.
Red OFFGreen ON
When the green LED is on, the batterycharger is charging at a FLOAT orMAINTENANCE rate of less than 1.5 amps(stage 3). Your battery is now 90% chargedand ready for use. This float charging currentwill gradually decrease to as low as 0.1 ampsas the battery reaches 100% charge. It willnow be kept at full charge withoutovercharging.
If the green LED stays on when your batteryis known to be low, refer to Section 4.4 in thismanual.
Figure 3-12 Battery Charger LED Indicator Functions
TP-6734 5/10 39Section 3 Scheduled Maintenance
3.9 Circuit Protection
If the generator set circuit breaker trips or the fuses blow
repeatedly, see Section 4, Troubleshooting, for possible
causes.
3.9.1 Line Circuit Breaker
A line circuit breaker interrupts the generator output in
the event of a fault in the wiring between the generator
and the load. The line circuit breaker location is shown
in Figure 1-2. If the circuit breaker trips, reduce the load
and switch the breaker back to theONposition. With the
breaker in the OFF position the generator set runs but
the generator output is disconnected from the load.
3.9.2 Fuses
A 20-amp circuit breaker protects the alternator and two
fuses protect the electrical controls. See Section 4.2 for
fuse locations. A 10-amp inline fuse protects the battery
charger.
See Figure 3-13 for fuse part numbers. Always identify
and correct the cause of a blown fuse before restarting
the generator set. Refer to Section 4, Troubleshooting,
for conditions that may indicate a blown fuse. Replace
blown fuses with identical replacement parts.
Fuse Label Rating, Amp Part Number
Controller power F3 3 GM66128
Fuel solenoid/Starter relay/Throttle control
F2 7.5 GM66129
Battery charger(RES)
— 10 223316
Figure 3-13 Fuses
TP-6734 5/1040 Section 3 Scheduled Maintenance
3.10 Storage Procedure
Perform the following storage procedure before
removing the generator set from service for three
months or longer. Follow the engine manufacturer’s
recommendations for storage, if available.
Note: Run the generator set monthly whenever
possible.
3.10.1 Lubricating System
1. Operate the generator set until it reaches operating
temperature, or about 15 minutes.
2. Stop the generator set.
3. While the engine is still warm, drain the engine
lubrication oil from the engine crankcase.
4. Refill engine crankcase with oil. See Section 3.2.3
for oil recommendations.
5. Run the generator set for a few minutes to
distribute the clean oil.
6. Stop the generator set.
3.10.2 Fuel System
1. Start the generator set.
2. With the generator set running, shut off the gas
supply.
3. Run the generator set until the engine stops.
4. Press the OFF button on the generator set
controller.
3.10.3 Cylinder Lubrication
1. Remove the spark plugs.
2. Pour one tablespoon of engine oil into each spark
plug hole. Install the spark plugs and ground the
spark plug leads. Do not connect the leads to the
plugs.
3. Crank the engine two or three revolutions to
lubricate the cylinders.
3.10.4 Exterior Preparation
1. Clean the exterior surface of the generator set.
2. Seal all openings in the engine with nonabsorbent
adhesive tape.
3. Mask all areas to be used for electrical contact.
4. Spread a light film of oil over unpainted metallic
surfaces to prevent rust and corrosion.
3.10.5 Battery
Perform battery storage last.
1. Press the OFF button on the generator set
controller.
2. Disconnect the battery, negative (--) lead first.
3. Clean the battery.
4. Place the battery in a warm, dry location.
5. Connect the battery to a float/equalize battery
charger, or charge the battery monthly using a
trickle charger. Follow the battery charger
manufacturer’s recommendations.
TP-6734 5/10 41Section 4 Troubleshooting
Section 4 Troubleshooting
4.1 Introduction
Use the following charts to diagnose and correct
common problems. First check for simple causes such
as a dead engine starting battery, loose connections, or
an open circuit breaker. The charts include a list of
common problems, possible causes of the problem, and
recommended corrective actions.
If the procedures in this manual do not explain how to
correct the problem, contact an authorized distributor/
dealer. Maintain a record of repairs and adjustments
performed on the equipment. Use the record to help
describe the problem and repairs or adjustments made
to the equipment.
4.2 Controller Service Access
The controller fuses and alternator winding circuit
breaker are accessible from the front of the controller.
Remove the service access door to reach the circuit
breaker and fuses. See Figure 4-1.
Obtain replacement fuses from a Kohler authorized
distributor/dealer.
2
GM62860
1. USB port (for service)
2. Alternator winding circuit breaker3. Controller fuses F2 and F3
1
3
Figure 4-1 Controller Service Access (cover
removed)
4.3 Generator Set Troubleshooting
Figure 4-2 contains generator set troubleshooting,
diagnostic, and repair information. Check for loose
connections before replacing parts.
Fault Codes
The controller displays fault codes to aid in
troubleshooting. Fault codes, descriptions, and
recommended actions are listed in Section 2.9.
If a fault code is displayed, identify and correct the cause
of the fault condition. Then reset the controller. See
Section 2.9.4.
TP-6734 5/1042 Section 4 Troubleshooting
Problem Possible Cause Corrective Action
Controller LEDdisplay is off.
Controller is OFF (check the OFF LED) Press RUN to start the generator set or AUTO forautomatic operation.
Controller fuse (F3) is blown. Replace the fuse. If the fuse blows again, contactan authorized distributor/dealer.
Low or no battery voltage. Check battery connections.Check the engine starting battery and batterycharger. See Figure 4-3.
The generator setdoes not crank.
Fault shutdown Check for a fault code on the controller display. SeeSection 2.9.
Battery weak or dead Check power to the battery charger. SeeFigure 4-3.Recharge or replace the battery.
Battery charger fuse blown Replace the fuse. Contact an authorized distributor/dealer for service if fuse blows repeatedly.
Battery connections reversed or poor Check battery connections.
Fuse F2 blown Replace the fuse. Contact an authorized distributor/dealer for service if fuse blows repeatedly.
Fuse F3 blown Replace the fuse. Contact an authorized distributor/dealer for service if fuse blows repeatedly.
Controller is OFF (check the OFF LED) Press AUTO for remote start or RUN for local start.
The generator setcranks but does notstart, starts hard,lacks power, oroperates erratically.
Air cleaner clogged Clean and/or replace the air cleaner.
Battery weak or dead Check power to the battery charger.Recharge or replace the battery.
Battery connection poor Clean and tighten the battery connections.
Spark plug wire connection loose Check the spark plug wires.
Low oil pressure shutdown Check the oil level.
Fuel pressure insufficient Check the fuel supply and valves.
Engine malfunction Contact an authorized distributor/dealer.
No AC output. AC circuit breaker in the OFF position Place the circuit breaker in the ON position.
AC circuit breaker tripping because of overload Reduce the load on the generator set.
AC circuit breaker tripping because of shortcircuit
Contact an authorized distributor/dealer for service.
Auxiliary winding circuit breaker tripped Reset the circuit breaker. See Figure 4-1. Contactan authorized distributor/ dealer for service if circuitbreaker trips repeatedly.
Low output orexcessive drop involtage.
Generator set overloaded Reduce the load.
Generator set stopssuddenly.
Low oil pressure shutdown Check the oil level. Check for signs of oil leaks.
No fuel Check fuel supply. Contact fuel supplier.
Overcrank shutdown Reset the controller. If the overcrank fault occursagain, contact an authorized distributor/dealer.
Controller fuse (F3) blown Replace the fuse. If the fuse blows again, contactan authorized distributor/dealer.
Overspeed shutdown Reset the controller. If the overspeed fault occursagain, contact an authorized distributor/dealer.
Generator set master switch in the OFF/RESETposition
Move the switch to the correct position (RUN orAUTO).
Remote stop command received from a remoteswitch or ATS
Check the remote switch position.
Engine malfunction Contact an authorized distributor/dealer.
Auxiliary winding circuit breaker tripped Reset the circuit breaker. See Figure 4-1. Contactan authorized distributor/dealer for service if circuitbreaker trips repeatedly.
Figure 4-2 General Troubleshooting Chart
TP-6734 5/10 43Section 4 Troubleshooting
4.4 Battery Charger
Troubleshooting
Use the battery charger’s LED indicators and the table in Figure 4-3 to troubleshoot battery charger operation
problems.
Problem Cause Solution
Red LED stays onfor more than24 hours
One or more inoperative or damaged cells. Load test the battery and replace, if necessary.
Battery charger has reduced its output
voltage below the normal level due to a DC
overload or a DC short.
Remove the source of the overload or short.
Disconnect the battery charger’s black (NEGATIVE)
ring terminal from the battery. Reapply AC power and
the green LED only should now light.
Onboard DC systems are drawing more
current than the battery charger can replace.
Turn off all DC equipment while charging.
Red and greenLEDs stay on formore than 24 hours
Onboard DC systems are drawing between
1.5 and 5 amps.
Turn off all DC equipment while charging.
One or more inoperative or damaged cells. Load test the battery and replace, if necessary.
Extremely low AC voltage at the battery
charger.
Apply a higher AC voltage source or reduce the length
of the extension cord.
Green LED stays onwhen the battery isknown to be low
Open DC output fuse. Replace AGS-10 fuse.
Faulty or contaminated terminal connections. Clean and tighten or repair all terminal connections.
One or more inoperative or damaged cells. Load test the battery and replace, if necessary.
Neither of the LEDsturn on when theAC power is applied
No AC power available at the battery
charger.
Connect AC power or reset the AC breaker on the
main panel.
Component failure. Replace battery charger.
Figure 4-3 6-Amp Battery Charger Troubleshooting
TP-6734 5/1044 Section 4 Troubleshooting
Notes
TP-6734 5/10 Appendix 45
Appendix A Abbreviations
The following list contains abbreviations that may appear in this publication.
A, amp ampereABDC after bottom dead centerAC alternating currentA/D analog to digitalADC advanced digital control;
analog to digital converteradj. adjust, adjustmentADV advertising dimensional
drawingAh amp-hourAHWT anticipatory high water
temperatureAISI American Iron and Steel
InstituteALOP anticipatory low oil pressurealt. alternatorAl aluminumANSI American National Standards
Institute (formerly AmericanStandards Association, ASA)
AO anticipatory onlyAPDC Air Pollution Control DistrictAPI American Petroleum Instituteapprox. approximate, approximatelyAPU Auxiliary Power UnitAQMD Air Quality Management DistrictAR as required, as requestedAS as supplied, as stated, as
suggestedASE American Society of EngineersASME American Society of
Mechanical Engineersassy. assemblyASTM American Society for Testing
MaterialsATDC after top dead centerATS automatic transfer switchauto. automaticaux. auxiliaryavg. averageAVR automatic voltage regulatorAWG American Wire GaugeAWM appliance wiring materialbat. batteryBBDC before bottom dead centerBC battery charger, battery
chargingBCA battery charging alternatorBCI Battery Council InternationalBDC before dead centerBHP brake horsepowerblk. black (paint color), block
(engine)blk. htr. block heaterBMEP brake mean effective pressurebps bits per secondbr. brassBTDC before top dead centerBtu British thermal unitBtu/min. British thermal units per minuteC Celsius, centigradecal. calorieCAN controller area networkCARB California Air Resources BoardCAT5 Category 5 (network cable)CB circuit breakerCC crank cyclecc cubic centimeterCCA cold cranking ampsccw. counterclockwiseCEC Canadian Electrical Codecert. certificate, certification, certifiedcfh cubic feet per hour
cfm cubic feet per minuteCG center of gravityCID cubic inch displacementCL centerlinecm centimeterCMOS complementary metal oxide
substrate (semiconductor)com communications (port)coml commercialComl/Rec Commercial/Recreationalconn. connectioncont. continuedCPVC chlorinated polyvinyl chloridecrit. criticalCSA Canadian Standards
AssociationCT current transformerCu coppercUL Canadian Underwriter’s
LaboratoriesCUL Canadian Underwriter’s
Laboratoriescu. in. cubic inchcw. clockwiseCWC city water-cooledcyl. cylinderD/A digital to analogDAC digital to analog converterdB decibeldB(A) decibel (A weighted)DC direct currentDCR direct current resistancedeg., ° degreedept. departmentdia. diameterDI/EO dual inlet/end outletDIN Deutsches Institut fur Normung
e. V. (also Deutsche IndustrieNormenausschuss)
DIP dual inline packageDPDT double-pole, double-throwDPST double-pole, single-throwDS disconnect switchDVR digital voltage regulatorE2PROM, EEPROM
electrically-erasableprogrammable read-onlymemory
E, emer. emergency (power source)ECM electronic control module,
engine control moduleEDI electronic data interchangeEFR emergency frequency relaye.g. for example (exempli gratia)EG electronic governorEGSA Electrical Generating Systems
AssociationEIA Electronic Industries
AssociationEI/EO end inlet/end outletEMI electromagnetic interferenceemiss. emissioneng. engineEPA Environmental Protection
AgencyEPS emergency power systemER emergency relayES engineering special,
engineered specialESD electrostatic dischargeest. estimatedE-Stop emergency stopetc. et cetera (and so forth)
exh. exhaustext. externalF Fahrenheit, femaleFHM flat head machine (screw)fl. oz. fluid ounceflex. flexiblefreq. frequencyFS full scaleft. foot, feetft. lb. foot pounds (torque)ft./min. feet per minuteftp file transfer protocolg gramga. gauge (meters, wire size)gal. gallongen. generatorgenset generator setGFI ground fault interrupter
GND, groundgov. governorgph gallons per hourgpm gallons per minutegr. grade, grossGRD equipment groundgr. wt. gross weightH x W x D height by width by depthHC hex capHCHT high cylinder head temperatureHD heavy dutyHET high exhaust temp., high
engine temp.hex hexagonHg mercury (element)HH hex headHHC hex head capHP horsepowerhr. hourHS heat shrinkhsg. housingHVAC heating, ventilation, and air
conditioningHWT high water temperatureHz hertz (cycles per second)IBC International Building CodeIC integrated circuitID inside diameter, identificationIEC International Electrotechnical
CommissionIEEE Institute of Electrical and
Electronics EngineersIMS improved motor startingin. inchin. H2O inches of waterin. Hg inches of mercuryin. lb. inch poundsInc. incorporatedind. industrialint. internalint./ext. internal/externalI/O input/outputIP internet protocolISO International Organization for
StandardizationJ jouleJIS Japanese Industry Standardk kilo (1000)K kelvinkA kiloampereKB kilobyte (210 bytes)KBus Kohler communication protocolkg kilogram
TP-6734 5/1046 Appendix
kg/cm2 kilograms per squarecentimeter
kgm kilogram-meterkg/m3 kilograms per cubic meterkHz kilohertzkJ kilojoulekm kilometerkOhm, kΩ kilo-ohmkPa kilopascalkph kilometers per hourkV kilovoltkVA kilovolt amperekVAR kilovolt ampere reactivekW kilowattkWh kilowatt-hourkWm kilowatt mechanicalkWth kilowatt-thermalL literLAN local area networkL x W x H length by width by heightlb. pound, poundslbm/ft3 pounds mass per cubic feetLCB line circuit breakerLCD liquid crystal displayLED light emitting diodeLph liters per hourLpm liters per minuteLOP low oil pressureLP liquefied petroleumLPG liquefied petroleum gasLS left sideLwa sound power level, A weightedLWL low water levelLWT low water temperaturem meter, milli (1/1000)M mega (106 when used with SI
units), malem3 cubic meterm3/hr. cubic meters per hourm3/min. cubic meters per minutemA milliampereman. manualmax. maximumMB megabyte (220 bytes)MCCB molded-case circuit breakerMCM one thousand circular milsmeggar megohmmeterMHz megahertzmi. milemil one one-thousandth of an inchmin. minimum, minutemisc. miscellaneousMJ megajoulemJ millijoulemm millimetermOhm,mΩmilliohmMOhm, MΩmegohmMOV metal oxide varistorMPa megapascalmpg miles per gallonmph miles per hourMS military standardms millisecondm/sec. meters per secondmtg. mountingMTU Motoren-und Turbinen-UnionMW megawattmW milliwattμF microfaradN, norm. normal (power source)NA not available, not applicablenat. gas natural gas
NBS National Bureau of StandardsNC normally closedNEC National Electrical CodeNEMA National Electrical
Manufacturers AssociationNFPA National Fire Protection
AssociationNm newton meterNO normally openno., nos. number, numbersNPS National Pipe, StraightNPSC National Pipe, Straight-couplingNPT National Standard taper pipe
thread per general useNPTF National Pipe, Taper-FineNR not required, normal relayns nanosecondOC overcrankOD outside diameterOEM original equipment
manufacturerOF overfrequencyopt. option, optionalOS oversize, overspeedOSHA Occupational Safety and Health
AdministrationOV overvoltageoz. ouncep., pp. page, pagesPC personal computerPCB printed circuit boardpF picofaradPF power factorph., ∅ phasePHC Phillips head Crimptite
(screw)PHH Phillips hex head (screw)PHM pan head machine (screw)PLC programmable logic controlPMG permanent magnet generatorpot potentiometer, potentialppm parts per millionPROM programmable read-only
memorypsi pounds per square inchpsig pounds per square inch gaugept. pintPTC positive temperature coefficientPTO power takeoffPVC polyvinyl chlorideqt. quart, quartsqty. quantityR replacement (emergency)
power sourcerad. radiator, radiusRAM random access memoryRDO relay driver outputref. referencerem. remoteRes/Coml Residential/CommercialRFI radio frequency interferenceRH round headRHM round head machine (screw)rly. relayrms root mean squarernd. roundRO read onlyROM read only memoryrot. rotate, rotatingrpm revolutions per minuteRS right sideRTDs Resistance Temperature
Detectors
RTU remote terminal unitRTV room temperature vulcanizationRW read/writeSAE Society of Automotive
Engineersscfm standard cubic feet per minuteSCR silicon controlled rectifiers, sec. secondSI Systeme international d’unites,
International System of UnitsSI/EO side in/end outsil. silencerSMTP simple mail transfer protocolSN serial numberSNMP simple network management
protocolSPDT single-pole, double-throwSPST single-pole, single-throwspec specificationspecs specification(s)sq. squaresq. cm square centimetersq. in. square inchSMS short message serviceSS stainless steelstd. standardstl. steeltach. tachometerTB terminal blockTCP transmission control protocolTD time delayTDC top dead centerTDEC time delay engine cooldownTDEN time delay emergency to
normalTDES time delay engine startTDNE time delay normal to
emergencyTDOE time delay off to emergencyTDON time delay off to normaltemp. temperatureterm. terminalTHD total harmonic distortionTIF telephone influence factortol. toleranceturbo. turbochargertyp. typical (same in multiple
locations)UF underfrequencyUHF ultrahigh frequencyUIF user interfaceUL Underwriter’s Laboratories, Inc.UNC unified coarse thread (was NC)UNF unified fine thread (was NF)univ. universalURL uniform resource locator
(web address)US undersize, underspeedUV ultraviolet, undervoltageV voltVAC volts alternating currentVAR voltampere reactiveVDC volts direct currentVFD vacuum fluorescent displayVGA video graphics adapterVHF very high frequencyW wattWCR withstand and closing ratingw/ withWO write onlyw/o withoutwt. weightxfmr transformer
2010 by Kohler Co. All rights reserved.
TP-6734 5/10
KOHLER CO. Kohler, Wisconsin 53044Phone 920-565-3381, Fax 920-459-1646For the nearest sales/service outlet in theUS and Canada, phone 1-800-544-2444KohlerPower.com
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