1 50ES --- A Comfortt 13 SEER Single---Packaged Air Conditioner System With Puron® (R---410A) Refrigerant Single and Three Phase 2---5 Nominal Tons (Sizes 24---60) Product Data A09034 Fig. 1 -- Unit50ES--A Single--Packaged Products with Energy--Saving Features and PuronR refrigerant. S Up to 13.5 SEER S Factory--Installed TXV S ECM Motor--Standard S Low Sound Levels FEATURES/BENEFITS One--piece cooling unit with optional electric heater, low sound levels, easy installation, low maintenance, and dependable performance. Puron Environmentally Sound Refrigerant is Carrier’s unique refrigerant designed to help protect the environment. Puron is an HFC refrigerant which does not contain chlorine that can harm the ozone layer. Puron refrigerant is in service in millions of systems, proving highly reliable, environmentally sound performance. Easy Installation Factory--assembled package is a compact, fully self--contained, electric cooling unit that is prewired, pre--piped, and pre--charged for minimum installation expense. These units are available in a variety of standard cooling sizes with voltage options to meet residential and light commercial requirements. Units are lightweight and install easily on a rooftop or at ground level. The high tech composite base eliminates rust problems associated with ground level applications. Innovative Unit Base Design On the inside a high--tech composite material will not rust and incorporates a sloped drain pan which improves drainage and helps inhibit mold, algae and bacterial growth. On the outside metal base rails provide added stability as well as easier handling and rigging. Convertible duct configuration Unit is designed for use in either downflow or horizontal applications. Each unit is converted from horizontal to downflow and includes horizontal duct covers. Downflow operation is provided in the field to allow vertical ductwork connections. The basepan seals on the bottom openings to ensure a positive seal in the vertical airflow mode. Efficient operation High--efficiency design offers SEER (Seasonal Energy Efficiency Ratios) of up to 13.5. (See page 4.) Durable, dependable components Scroll Compressors are designed for high efficiency. Each compressor is hermetically sealed against contamination to help promote longer life and dependable operation. Each compressor also has vibration isolation to provide quieter operation. All compressors have internal high pressure and overcurrent protection. ECM Motor is standard on all 50ES--A models. Direct--drive PSC (Permanent Split Capacitor) condenser--fan motors are designed to help reduce energy consumption and provide for cooing operation down to 40_F (4.4_C) outdoor temperature. Motormasterr II low ambient kit is available as a field--installed accessory. Thermostatic Expansion Valve -- A hard shutoff, balance port TXV maintains a constant superheat at the evaporator exit (cooling cycle) resulting in higher overall system efficiency. Refrigerant system is designed to provide dependability. Liquid filter driers are used to promote clean, unrestricted operation. Each unit leaves the factory with a full refrigerant charge. Refrigerant service connections make checking operating pressures easier. High and Low Pressure Switches provide added reliability for the compressor. Indoor and Outdoor coils are computer--designed for optimum heat transfer and efficiency. The indoor coil is fabricated from copper tube and aluminum fins and is located inside the unit for protection against damage. The outdoor coil is internally mounted on the top tier of the unit. Low sound ratings ensure a quiet indoor and outdoor environment with sound ratings as low as 75dBA. (See Page 4.) Easy to service cabinets provide easy 3--panel accessibility to serviceable components during maintenance and installation. The basepan with integrated drain pan provides easy ground level installation with a mounting pad. A nesting feature ensures a positive basepan to roof curb seal when the unit is roof mounted. A convenient 3/4--in. (19.1 mm) wide perimeter flange makes frame mounting on a rooftop easy.
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1
50ES---AComfortt 13 SEER Single---Packaged Air ConditionerSystem With Puron® (R---410A) RefrigerantSingle and Three Phase2---5 Nominal Tons (Sizes 24---60)
Product Data
A09034
Fig. 1 -- Unit 50ES--A
Single--Packaged Products with Energy--Saving Features andPuronR refrigerant.S Up to 13.5 SEERS Factory--Installed TXV
S ECM Motor--StandardS Low Sound Levels
FEATURES/BENEFITSOne--piece cooling unit with optional electric heater, low soundlevels, easy installation, low maintenance, and dependableperformance.
Puron Environmentally Sound Refrigerant is Carrier’s uniquerefrigerant designed to help protect the environment. Puron is anHFC refrigerant which does not contain chlorine that can harm theozone layer. Puron refrigerant is in service in millions of systems,proving highly reliable, environmentally sound performance.
Easy InstallationFactory--assembled package is a compact, fully self--contained,electric cooling unit that is prewired, pre--piped, and pre--chargedfor minimum installation expense. These units are available in avariety of standard cooling sizes with voltage options to meetresidential and light commercial requirements. Units arelightweight and install easily on a rooftop or at ground level. Thehigh tech composite base eliminates rust problems associated withground level applications.
Innovative Unit Base DesignOn the inside a high--tech composite material will not rust andincorporates a sloped drain pan which improves drainage and helpsinhibit mold, algae and bacterial growth. On the outside metal baserails provide added stability as well as easier handling and rigging.
Convertible duct configurationUnit is designed for use in either downflow or horizontalapplications. Each unit is converted from horizontal to downflowand includes horizontal duct covers. Downflow operation isprovided in the field to allow vertical ductwork connections. Thebasepan seals on the bottom openings to ensure a positive seal inthe vertical airflow mode.
Efficient operation High--efficiency design offers SEER(Seasonal Energy Efficiency Ratios) of up to 13.5. (See page 4.)
Durable, dependable componentsScroll Compressors are designed for high efficiency. Eachcompressor is hermetically sealed against contamination to helppromote longer life and dependable operation. Each compressoralso has vibration isolation to provide quieter operation. Allcompressors have internal high pressure and overcurrentprotection.
ECM Motor is standard on all 50ES--A models.
Direct--drive PSC (Permanent Split Capacitor) condenser--fanmotors are designed to help reduce energy consumption andprovide for cooing operation down to 40_F (4.4_C) outdoortemperature. Motormasterr II low ambient kit is available as afield--installed accessory.
Thermostatic Expansion Valve -- A hard shutoff, balance portTXV maintains a constant superheat at the evaporator exit (coolingcycle) resulting in higher overall system efficiency.
Refrigerant system is designed to provide dependability. Liquidfilter driers are used to promote clean, unrestricted operation. Eachunit leaves the factory with a full refrigerant charge. Refrigerantservice connections make checking operating pressures easier.
High and Low Pressure Switches provide added reliability for thecompressor.
Indoor and Outdoor coils are computer--designed for optimumheat transfer and efficiency. The indoor coil is fabricated fromcopper tube and aluminum fins and is located inside the unit forprotection against damage. The outdoor coil is internally mountedon the top tier of the unit.
Low sound ratings ensure a quiet indoor and outdoorenvironment with sound ratings as low as 75dBA. (See Page 4.)
Easy to service cabinets provide easy 3--panel accessibility toserviceable components during maintenance and installation. Thebasepan with integrated drain pan provides easy ground levelinstallation with a mounting pad. A nesting feature ensures apositive basepan to roof curb seal when the unit is roof mounted. Aconvenient 3/4--in. (19.1 mm) wide perimeter flange makes framemounting on a rooftop easy.
2
Standard horizontal metal duct covers with insulation comewith the unit and cover the horizontal duct openings. These can beleft in place if the units are converted to downflow.
Cabinets are constructed of heavyduty, phosphated, zinc--coatedprepainted steel capable of withstanding 500 hours in salt spray.Interior surfaces of the evaporator/heat exchanger compartment areinsulated with cleanable semi--rigid insulation board, which keepsthe conditioned air from being affected by the outdoor ambienttemperature and provides improved indoor air quality. (Conformsto American Society of Heating, Refrigeration and AirConditioning Engineers No. 62P.) The sloped drain pan minimizesstanding water in the drain. An external drain is provided.
FE --- Economizer (3 Phase Only)TF --- Filter RackTP --- Base unit with tin plated indoor coil hairpins
(Single Phase Only
See Price Page for full list of factory options.Only used if ordering an option
---
N/A
A
Major Series
Use of the AHRI CertifiedTM Mark indicates amanufacturer’s participation in the program For verification of certification for individual products, go to www.ahridirectory.org.
LEGENDdB---Sound Levels (decibels)db—Dry BulbSEER—Seasonal Energy Efficiency Ratiowb—Wet BulbCOP---Coefficient of Performance* Air Conditioning, Heating & Refrigeration Institute.**At “A” conditions---80_F (26.7_C) indoor db/67_F (19.4_C) indoor wb &95_F (35_C) outdoor db.{ Rated in accordance with U.S. Government DOE Department of Energy)test procedures and/or AHRI Standards 210/240.
Notes:1. Ratings are net values, reflecting the effects of circulating fan heat.Ratings are based on:Cooling Standard: 80°F (26.7_C) db, 67°F wb (19.4_C) indoor entering---airtemperature and 95°F db (35_C) outdoor entering---air temperature.2. Before purchasing this appliance, read important energy cost and effi-ciency information available from your retailer.
A--Weighted Sound Power Level (dBA)
UNIT 50ES--ASTANDARD
RATING(dBA)
TYPICAL OCTAVE BAND SPECTRUM (dBA without tone adjustment)
*For 460 volt units add 14 lb (6.35 kg) to the shipping weight.{ Required filter sizes shown are based on the larger of the AHRI (Air Conditioning, Heating and Refrigeration Institute) rated cooling airflow or the heatingairflow velocity of 300 ft/minute for throwaway type or 450 ft/minute for high---capacity type. Air filter pressure drop for non---standard filters must not exceed 0.08in. W.C.} If using accessory filter rack refer to the filter rack installation instructionsfor correct filter sizes and quantity.
ELECTRIC HEAT PRESSURE DROP TABLES (IN. W.C.)Small Cabinet: 24--36
Horizontal Economizer with solid state controls and barometricrelief dampers includes filter racks and provide outdoor air duringcooling and reduce compressor operation.
X
Vertical Economizer with solid state controls and barometric reliefdampers includes filter racks and provide outdoor air duringcooling and reduce compressor operation.
X X
Electric Heaters Electric Heat Supplement X
Filter Rack Filter Rack features easy installation, serviceability, and high---filtering performance for vertical applications. Includes 1---in. filter. X X
Flat Roof Curbs Flat Roof Curbs in both 11---in (279 mm) and 14---in. (356 mm)sizes are available for roof mounted applications. X
Low Ambient KitLow Ambient Kit (Motormaster II Control) allows the use of mech-anical cooling down to outdoor temperatures as low as 0°F(---18° C) when properly installed.
X
Louver Metal Outdoor Coil Grilles Louver Metal Outdoor Coil Grilles provides hail and vandalismprotection. X
Manual Outside Air Damper Manual Outside Air Damper includes hood and filter rack withadjustable damper blade for up to 25% outdoor air. X
Square---to---Round Duct Transition Kit Square---to---Round Duct Transition Kit enable 24---48 size units tobe fitted to 14 in. (356 mm) round ductwork. X
Time Guard II
Automatically prevents the compressor from restarting for at least4 minutes and 45 seconds after shutdown of the compressor. Notrequired when a corporate programmable thermostat is appliedor with a RTU---MP control.
X
Dual Point Electric HeatersAllows you to power the electric heater and unit contactor separ-ately by having two individual field power supply circuitsconnected respectively.
X
*Refer to Price Page for application detail.
Electric HeatersCATALOG
ORDERING NO.NOMINAL
CAPACITY (kW)FUSEQTY
USED WITH SIZES24 30 36 42 48 60
ELECTRIC HEATERS (208/230 — SINGLE PHASE — 60 Hz)CPHEATER052A00 5.0 --- X X X X X X
CPHEATER064A00 5.0 4 X X X X X X
CPHEATER069A00 7.2 --- X X X X X XCPHEATER070A00 7.2 4 X X X X X XCPHEATER065A00 10.0 --- X X X XCPHEATER050A00 10.0 4 X X X X X XCPHEATER051A00 15.0 4 X X XCPHEATER066A00 15.0 6 X X X X XCPHEATER053A00 20.0 4 X X XCPHEATER054A00 20.0 6 X X X
ELECTRIC HEATERS (208/230 — THREE PHASE — 60 Hz)CPHEATER055A00 5.0 --- X X X X X
CPHEATER056A00 10.0 --- X X X X XCPHEATER068A00 10.0 6 X X X X XCPHEATER057A00 15.0 --- X X X X XCPHEATER058A00 15.0 6 X X X X XCPHEATER059A01 20.0 6 X X X
ELECTRIC HEATERS (460 — THREE PHASE — 60 Hz)CPHEATER060A00 5.0 --- X X X X
CPHEATER061A00 10.0 --- X X X XCPHEATER062A00 15.0 --- X X X XCPHEATER063A00 20.0 --- X X X
NOTE: Electric heaters are rated at 240v. Refer to Multiplication Factors table for other voltages.X = Approved combinations.
Minimum Airflow for Safe Electric Heater Operation (CFM)SIZE 24 30 36 42 48 60CFM 800 1000 1200 1400 1600 1750
50ES--A
7
ECONOMIZER
COIL
FILTER
SIDE VIEW
CAULK BOTTOM CORNEROF ECONOMIZERON EACH SIDE
BASE
COIL
FLANGEON BASE DETAIL
ECONOMIZER
FI LTER
EV APORATORCOIL
TOP FILTER RACK
BEND FLANGE AT 90° -SCREW TODIVIDER WITH 1-IN. (25 mm) SCREW
BOTTOM FILTERRACK
DAMPERBLADE
MANUAL OUTSIDEAIR HOOD
REPLACEMENTPANEL
ECONOMIZER
FILTER RACK
MANUAL OUTSIDE AIR DAMPER
Vertical Economizer
Horizontal Economizer
A09375
50ES--A
8
UNIT DIMENSIONS -- 50ES--A24--36
A09457
50ES--A
9
UNIT DIMENSIONS -- 50ES--A42--60
A09458
50ES--A
10
ROOF CURB ACCESSORY -- 50ES--A24--60
RETURN AIR
SMALLBASE UNIT
SUPPLYAIR
LARGEBASE UNIT
UNIT PLACEMENT ON COMMON CURB
LARGE CURB SMALL OR LARGE BASE UNIT
SMALL/COMMON CURB
ROOF CURB DETAIL
Wood nailer*
Roofcurb*
Insulation(field supplied)
*Provided with roofcurb
Cant stripfield supplied
Roofing materialfield supplied
Flashing fieldsupplied
HVAC unitbase rails
Roofcurb
SealingGasket
HVAC unitbasepan
Anchor screw
A09090
A09413
A09094
A09415
C
B
AF
DE
Dashed lines show cross supportlocation for large basepan units.
G
H
C
B
AF
D
E
G
H
A09414
UNITSIZE
CATALOGNUMBER
AIN.
(mm)
B(small/common
base)IN. (mm)*
B(large base)IN. (mm)*
CIN.
(mm)
DIN.
(mm)
EIN.
(mm)
FIN.
(mm)
GIN. (mm)
HIN. (mm)
Smallor
Large
CPRFCURB010A00 11(279)
10 (254)
14 (356) 16(406)
47.8(1214)
32.4(822)
2.7 (69)
30.6 (778)
46.1 (1170)CPRFCURB011A00 14
(356)
LargeCPRFCURB012A00 11
(279)14 (356) 43.9
(1116) 42.2 (1072)CPRFCURB013A00 14
(356)
* Part Numbers CPRCURB010A00 and CPRCURB011A00 can be used on both small and large basepan units. The cross supports must be located based onwhether the unit is a small basepan or a large basepan.NOTES:
1. Roof curb must be set up for unit being installed.
2. Seal strip must be applied, as required, to unit being installed.
3. Roof curb is made of 16--gauge steel.
4. Attach ductwork to curb (flanges of duct rest on curb).
2. Select unit based on required cooling capacity.Enter Net Cooling Capacities table at condenser enteringtemperature of 95°F (35°C), indoor air entering at 1200 CFM and67°F (19°C) ewb (entering wet bulb). The unit will provide a totalcapacity of 34,400 Btuh and a SHC of 25,900 Btuh.
3. Select electric heat.The required heating capacity is 30,000 Btuh.
Determine additional electric heat capacity in kW.
30,000 Btuh = 8.8kW of heat required3,414 Btuh/kW
Enter the electric Heater Packages table for 208/240, single--phase,50ES--A36 unit. The 10 kW heater at 240v most closely satisfiesthe heating required. To calculate kW at the 230v, multiply theheater kW by multiplication factor 0.92 found in the WattageMultiplication Factors table.
10 kW x 0.92 = 9.2 kW
9.2 kW x 3414 = 31,409 Btuh
4. Determine fan speed and power requirements atdesign conditions.Before entering the air delivery tables, calculate the total staticpressure required. From the given example, the Wet Coil PressureDrop Table, and the Filter Pressure Drop Table:
External Static Pressure 0.30 IN. W.C.
Filter 0.14 IN. W.C.
Wet Coil Pressure Drop 0.10 IN. W.C.
Total Static Pressure 0.54 IN. W.C.
Enter the table for Wet Coil Air Delivery—horizontal discharge,230. At 0.60 IN. W.C. ESP (external static pressure) andmedium--high speed, the fan will deliver 1316 CFM.
5. Select unit that corresponds to power sourceavailable.The Electrical Data Table shows that the unit is designed to operateat 208/230--1--60.
Condensate trap — A 2--in. (50.8 mm) condensate trap must befield supplied.
Ductwork — Secure downflow discharge ductwork to roof curb.For horizontal discharge applications, attach ductwork to unit withflanges.
To convert a unit to downflow discharge — Units are equippedwith factory--installed inserts in the downflow openings. Removalof the inserts is similar to removing an electrical knock--out.
Maximum cooling airflow — To minimize the possibility ofcondensate blow--off from the evaporator, airflow through the unitsshould not exceed 450 cfm per ton.
Minimum cooling airflow — Minimum cooling airflow is 350cfm per ton.
Minimum ambient cooling operation temperature — Allstandard units have a minimum ambient operating temperature of40_F (4_C). With accessory low ambient temperature kit, units canoperate at temperatures down to 0_F (--17_C).
* kW@ 208/240 or 480 volts** FUSE OR CIRCUIT BREAKERNote: 460 volt units have 230 volt ID motors with FLA values at 230 volts
LEGEND
FLA - Full Load AmpsIDM - Inducer MotorIFM - Indoor Fan MotorLRA -Locked Rotor AmpsMCA - Minimum Circuit AmpsMOCP - Maximum Over Current ProtectionOFM - Outdoor Fan MotorRLA - Rated Load Amps
A06564
50ES--A
29
CONNECTION WIRING SCHEMATIC 208/230--1--60
A11004
50ES--A
30
LADDER WIRING SCHEMATIC 208/230--1--60
A11003
50ES--A
31
CONNECTION WIRING SCHEMATIC 208/230--3--60
A11010
50ES--A
32
LADDER WIRING SCHEMATIC 208/230--3--60
A11009
50ES--A
33
CONNECTION WIRING SCHEMATIC 460--3--60
A10204
50ES--A
34
LADDER WIRING SCHEMATIC 460--3--60
A10204
50ES--A
35
CONTROLSOperating sequenceCooling — When the system thermostat calls for cooling, 24 V issupplied to the “Y” and “G” terminals of the thermostat. Thiscompletes the circuit to the contactor coil (C) and indoor(evaporator) fan motor (IFM). The normally open contacts of Cclose and complete the circuit through compressor motor (COMP)to outdoor (condenser) fan motor (OFM). Both motors startinstantly. Simultaneously, 24 volts is supplied through G to theInterface Fan Board (IFB) and to the IFM. The IFM starts instantly.
On the loss of the thermostat call for cooling, 24 V is removedfrom both the “Y” and “G” terminals (provided the fan switch is inthe “AUTO” position) de--energizing the compressor contactor andopening the contacts supplying power to compressor/OFM. After a90--second delay, the IFM shuts off. If the thermostat fan selectorswitch is in the “ON” position, the IFM will run continuously. Forthe 460 V units there is a step down autotransformer supplying 230V to the Indoor Fan Motor.
NOTE: On units with a Time Guard® II device: Once thecompressor has started and then stopped, it cannot be restartedagain until 5 minutes have elapsed.
Heating — If accessory electric heaters are installed, on a call forheat, circuit R--W is made through the thermostat contacts. CircuitR--G is made which energizes the IFM. If the heaters are staged,then the thermostat closes a second set of contacts (W2) whensecond stage is required. When thermostat is satisfied, contactsopen, deenergizing the heater relay and the IFM.
Outdoor rooftop mounted or ground mounted, electric coolingunit utilizing a hermetic scroll compressor for cooling duty.Unit shall discharge supply air vertically or horizontally asshown on contract drawings. Condenser fan/coil section shallhave a draw--thru design with vertical discharge for minimumsound levels.
QUALITY ASSURANCE
A. Unit shall be rated in accordance with AHRI Standards210/240 and 270.
B. Unit shall be designed in accordance with UL Standard1995.
C. Unit shall be manufactured in a facility registered to ISO9001 manufacturing quality standard.
D. Unit shall be UL listed and c--UL certified as a totalpackage for safety requirements.
E. Roof curb shall be designed to conform to NRCAStandards.
F. Insulation and adhesives shall meet NFPA 90Arequirements for flame spread and smoke generation.
G. Cabinet insulation shall meet ASHRAE Standard 62P.DELIVERY, STORAGE AND HANDLING
Unit shall be stored and handled per manufacturer’srecommendations.
Part 2 — ProductsEQUIPMENT
A. General:Factory--assembled, single--piece, heating and cooling unit.Contained within the enclosure shall be all factory wiring,piping, controls, refrigerant charge with R--410A refrigerant,and special features required prior to field start--up.
B. Unit Cabinet:1. Unit cabinet shall be constructed of phosphated,
zinc--coated, pre--painted steel capable of with--standing 500hours in salt spray.
2. Normal service shall be through a 3 removable cabinetpanels.
3. The unit shall be constructed on a rust proof unit base thathas an externally trapped, integrated sloped drain.
4. Evaporator fan compartment top surface shall be insulatedwith a minimum 1/2--in. (12.7 mm) thick, flexible fiberglassinsulation, coated on the air side and retained by adhesiveand mechanical means. The evaporator wall sections will beinsulated with a minimum semi--rigid foil--faced board ca-pable of being wiped clean. Aluminum foil--faced fiberglassinsulation shall be used in the entire indoor air cavitysection.
5. Unit shall have a field--supplied condensate trap.
C. Fans:1. The evaporator fan motor shall be an ECM .
2. Fan wheel shall be made from steel, be double--inlet typewith forward curved blades with corrosion resistant finish.Fan wheel shall be dynamically balanced.
3. Condenser fan shall be direct drive propeller type with alu-minum blades riveted to corrosion resistant steel spiders, bedynamically balanced, and discharge air vertically.
D. Compressor:1. Fully hermetic compressors with factory--installed vibration
isolation.2. Scroll compressors shall be standard on all units.
E. Coils:Evaporator and condenser coils shall have aluminum plate finsmechanically bonded to seamless copper tubes with all jointsbrazed. Tube sheet openings shall be belled to prevent tubewear.
F. Refrigerant Components:Refrigerant expansion device shall be of the TXV(thermostatic expansion valve) type.
G. Filters:Filter section shall consist of field--installed, throwaway, 1--in.(25 mm) thick fiberglass filters of commercially availablesizes.
H. Controls and Safeties:1. Unit controls shall be complete with a self--contained low
voltage control circuit.2. Units shall incorporate high and low pressure switches.
I. Operating Characteristics:1. Unit shall be capable of starting and running at 125_F
(51_C) ambient outdoor temperature per maximum loadcriteria of AHRI Standard 210.
2. Compressor with standard controls shall be capable of op-eration down to 40_F (4_C) ambient outdoor temperature.
3. Unit shall be provided with 60--second fan time delay afterthe thermostat is satisfied.
J. Electrical Requirements:All unit power wiring shall enter the unit cabinet at a single
location.
K. Motors:1. Compressor motors shall be of the refrigerant--cooled type
with line--break thermal and current overload protection.2. All fan motors shall have permanently lubricated bearings,
and inherent, automatic reset, thermal overload protection.3. Condenser fan motor shall be totally enclosed.4. Evaporator fan motor to be ECM Motor.
L. Special Features:1. Coil Options:
Base unit with tin plated indoor coil hairpins available as afactory installed option.
2. Compressor Start Kit (single phase units only):Shall provide additional starting torque for single--phasecompressors.
3. Thermostat:To provide for one--stage heating and cooling in additionmanual or automatic changeover and indoor fan control.
4. Crankcase Heater:Shall provide anti--floodback protection for low--load cool-ing applications.
5. Economizer:(Horizontal -- Field installed accessory)(Vertical -- Field installed accessory or factory installedoption)a. Economizer controls capable of providing free cooling
using outside air.
b. Equipped with low leakage dampers not to exceed 3%leakage, at 1.0 IN. W.C. pressure differential.
c. Spring return motor shuts off outdoor damper on powerfailure.
50ES--A
37
GUIDE SPECIFICATIONS (CONT)
6. Electric Heaters:
a. Electric heater shall be available as a field--installedoption.
b. Heater elements shall be open wire type, adequatelysupported and insulated with ceramic bushings.
c. Electric heater packages must provide single pointpower connection capability.
7. Filter Rack Kit:Shall provide filter mounting for downflow applications.Offered as an accessory or as a factory installed option.
8. Flat Roof Curb:Curbs shall have seal strip and a wood nailer for flashingand shall be installed per manufacturer’s instructions.
9. Low Ambient Package:Shall consist of a solid--state control and condenser coiltemperature sensor for controlling condenser--fan motor op-eration, which shall allow unit to operate down to 0_F(--17_C) outdoor ambient temperature when properlyinstalled.
10. Louvered Grille:Wire grille shall be standard on all units. Louvered grilleshall be available as a field--installed option to provide hailguard and vandalism protection.
11. Manual Outdoor Air Damper:Package shall consist of damper, birdscreen, and rainhoodwhich can be preset to admit outdoor air for year--roundventilation.
12. Square--To--Round Duct Transitions (24--48 size):Shall have the ability to convert the supply and return open-ings from rectangular to round.
13. Time Guard IIAutomatically prevents the compressor from restarting forat least 4 minutes and 45 seconds after shutdown of thecompressor. Not required when a corporate programmablethermostat is applied or with a RTU--MP control.
14. Dual Point Electric HeaterAllows you to power the electric heater and unit contactorseparately by having two individual field power supplycircuits connected respectively.
50ES--A
38
Copyright 2011 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 11/11
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.