Installation & Service Manual NFW, NCW, NFWG, NCWG, NFWE, NCWE This manual has been designed to be used in conjunction with the General (UL/NSF) Installation & Service Manual. Save the Instructions in Both Manuals for Future Reference!! This merchandiser conforms to the American National Standard Institute & NSF International Health and Sanitation standard ANSI/NSF 7 - 1999. PRINTED IN Specifications subject to REPLACES ISSUE PART IN U.S.A. change without notice. EDITION DATE 2/01 NO. 9037140 REV. Tyler Refrigeration Corporation * Niles, Michigan 49120 WIDE ISLAND FROZEN FOOD & ICE CREAM MERCHANDISERS Low Temperature Self Serve Display Cases
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Installation & ServiceManual
NFW, NCW, NFWG, NCWG, NFWE, NCWE
This manual has been designed to be used in conjunction with the General(UL/NSF) Installation & Service Manual.
Save the Instructions in Both Manuals for Future Reference!!This merchandiser conforms to the American National Standard Institute & NSF International Health and Sanitation standard ANSI/NSF 7 - 1999.
PRINTED IN Specifications subject to REPLACES ISSUE PARTIN U.S.A. change without notice. EDITION DATE 2/01 NO. 9037140 REV.
The NFW/NCW/NFWG/NCWG models havetwo pull-ups at each end of the case. Pull-upsA and B are located as shown and used forjoining all cases.
The NFWE/NCWE models have six pull-ups atthe rear of the case. Pull-ups A, B, C, D, E andF are located as shown and used for joiningend cases. All pull-ups should be installed andtightened starting with A and finishing with B orF.
1” Solid Partition
A 1” insulated partition is required betweenadjacent gas defrost cases that are on differ-ent refrigeration systems. 1” partitions areshipped installed as specified in the caseorder. Make sure the partitioned case isbeing installed in the proper location in thecase line-up. This assures proper refrigera-tion to all parts of the case line-up.
Apply sealant to outside surface of partitionwhere the two surfaces of the adjoining casewill contact the partition.
See “General-UL/NSF I&S Manual” for line-up assembly instructions.
After all case pull-ups have been secured, allinterior wall joint seams should be sealed withduct tape.
Plexiglas Partition
A plexiglas plug partition is required on adja-cent electric defrost cases that are on differ-ent refrigeration systems. These partitionscan be installed after the cases have beenjoined.
1. Install partition brackets (1) at case jointon front, center and/or rear case wall (2)with screws 3)
2. Slide plexiglas partitions (4) into partitionbrackets (1).
Installation & Service ManualNFW, NCW, NFWG, NCWG,
NFWE, NCWE
February, 2001 Page 7
Superstructure Installation
NFW/NCW/NFWG/NCWG Merchandising Shelf SuperstructuresDisplay Height off
Model Length Depth Lights Area FloorD8LFS 8’ 12” Std 8 sq ft 48”D12LFS 12’ 12” Std 12 sq ft 48”D8HFS 8’ 18” Std 12 sq ft 55”D12HFS 12’ 18” Std 18 sq ft 55”D82FSL 8’ 1-12” & 1-18” * 20 sq ft 58”D122FSL 12’ 1-12” & 1-18” * 30 sq ft 58”
*12” shelf standard with lights. 18” shelf lights are optional.
IMPORTANTFollow instructions in the numbered order.
1. Install lower uprights (1) on end of caseand secure with 3/8-16 x 1 1/4” bolts pro-vided.
2. After uprights are installed and secured,install lower shelf (2) by inserting shelfuprights into lower upright sections (1) andsecuring with 3/8-16 x 1 1/2” screws, wash-ers and nuts.
3. When furnished, the upper shelf (3) isinstalled and secured in the same manneras the lower shelf (2).
4. The internal wiring of the shelving anduprights is factory installed. It is necessaryto connect the provided harnesses (4) tosupply power to the shelves (2 & 3). Postheater pads (5) must be located even withthe load lines of the case to provide a heatbarrier to prevent sweating. Their pressuresensative backs make installation easy.
5. The light and heater harness wires in thelower upright must be inserted underneaththe tray support and plugged into the prop-er receptacles.
6. Secure the lower uprights (1) to the patchends with 3/8-16 x 1” screws (6) for addi-tional support. In a continuous line-up, theends of the shelves can be bolted together.
7. Before inserting the wires into the uprightposts, transfer drill 7/64 thru the covers andinto the posts. This will prevent accidentaldrilling into the wires. Use #6 SMS to fas-ten the covers over the wires.
The 8’ or 12’ span of these shelves is madepossible by the use of truss rod construction.
1. Remove joint trim or shelf end caps toobtain access to truss rod adjustments.
2. The truss rods on these shelves mayrequire adjusting for maximum load con-ditions. For heavier loads, tighten thetruss rod nuts. For lighter loads, loosenthe truss rod nuts. This will prevent bow-ing and/or sagging in the shelving.
Installation & Service ManualNFW, NCW, NFWG, NCWG,
NFWE, NCWE
February, 2001 Page 9
Trim Installation/Alignment
See “General-UL/NSF I&S Manual” forbumper, color band, raceway and kickplateinstallation.
Corner Trim Installation
Most corner trim on these cases comes fac-tory installed. The kickplate corner trimrequires field installation.
After kickplates (1) have been installed, slidekickplate corner trim (2) into both ends of thekickplates (1).
Refrigeration ProceduresSee “General-UL/NSF I&S Manual” for gen-eral system, control and superheat infor-mation.
Optional Dual Temperature Control
The dual temperature control unit is a factoryinstalled option. This control allows the userto easily switch from medium to low tempera-ture operation by flipping a switch. The dualtemperature control consists of an EPR valve
in the suction line coming off the evaporator.The EPR valve can be bypassed with a sole-noid controlled bypass line around it. Thetoggle switch opens or closes this solenoid.
When the solenoid is open, the evaporator isconnected directly to the compressor suctionthat allows for low temperature operation.When the solenoid is closed, the evaporatormust operate through the EPR valve whichhas been preset to the desired medium tem-perature.
EXAMPLE: R-404A system with 12 psig ofsuction pressure. With the suction line sole-noid open, the coil pressure operates at 12psig with a temperature of -29°F. When thetoggle switch is flipped, the solenoid closesdirecting the flow through the EPR valve. Ifthe EPR valve is set for 48 psig, the evapora-tor will see a coil temperature of 12°F and willoperate at a discharge air temperature ofabout 22°F.
When gas defrost is used, an additionalcheck valve is mounted around the EPR valveto allow reverse flow for the defrosting gas. Afan delay is also connected with gas defrostto cycle the fans off, but only during the medi-um temperature mode.
Electrical Procedures
Electrical Considerations
CAUTIONMake sure all electrical connections aretight. This prevents burning of electricalterminals and/or premature componentfailure.
NOTEThe raceway houses the electrical wiringand components for the case. All racewaycovers will be shipped loose.
This circuit is to be supplied by an uninterrupt-ed, protected 120V circuit. The case fan circuitis not cycled, except when equipped for gasdefrost. On gas defrost cases the fan circuit iscontrolled by a 50/40 klixon when used formedium temperatures.
NOTEWith gas defrost, the fans will not start untilthe coil temperature reaches 40°F at the fandelay klixon.
Anti-Sweat Circuit
All cases have at least one anti-sweat heater ineach discharge air grid and return air grid.When cases are equipped with an optionalsuperstructure, there is an anti-sweat heater onthe superstructure. Cases with glass frontshave an addtional anti-sweat heater under theglass retainer. Anti-sweat heaters are wireddirectly to the main power supply so they canoperate at all times.
Defrost InformationSee “General-UL/NSF I&S Manual” for oper-ational descriptions for each type of defrostcontrol.
Defrost Control Chart
NFW/NCW/NFWG/NCWG/NFWE/NCWEDefrost
Defrost Defrosts Duration Term.Type Per Day (Min) Temp.Electric/FF 1 46 50°FElectric/IC 1 46 50°FGas/FF 2-3 16-20 55°FGas/IC 2-3 20-26 55°F
E = Electric Defrost TerminationF/S = Electric Defrost Failsafe (Opt.)G = Gas Defrost Fan Delay (Dual Temp)A/S = Glass Anti-Sweat (Dual Temp)
Most klixons are located on the end of theevaporator coil. The diagram shows the loca-tion for each defrost type that uses a klixon.
NOTEThe defrost termination klixon for gasdefrost is located at the bypass check valve.
CAUTIONIf electronic sensors are used in place ofthe klixons, the sensors must be located inthe same location as the klixons for thatdefrost type. Any other locations will effectthe refrigeration efficiency of the case.
WIRING DIAGRAMSELECTRICIAN NOTE - OVERCURRENT
PROTECTION120V circuits should be protected by 15 or 20 Ampdevices per the requirements noted on the cabinetnameplate or the National Electrical Code, CanadianElectrical Code - Part 1, Section 28. 208V defrost cir-cuits employ No. 12 AWG field wire leads for fieldconnections. On remote cases intended for end toend line-ups, bonding for ground may rely upon thepull-up bolts.
The following wiring diagrams on pages 11thru 14 will cover the NFW/NCW/NFWG/NCWG/NFWE/NCWE case circuits and dualtemp circuits with electric and hot gas defrostoptions.
February, 2001 Page 11
NFW/NCW/NFWG/NCWG Domestic & Export (50Hz) Case Circuits
Page 12 February, 2001
February, 2001 Page 13
NFWE/NCWE Domestic & Export (50Hz) End Case Circuits
Page 14 February, 2001
Dual Temperature Control Circuits
Installation & Service ManualNFW, NCW, NFWG, NCWG,
2. Grasp and lift out each of the bottom traysfrom the case interior and carefullyremove through the door openings
3. After cleaning, replace in reverse order.
NSF Product Thermometer
Remove four screws and product thermome-ter bracket assembly from right rear locationin the case. After cleaning, replace productthermometer bracket assembly and securewith four screws.
Discharge Air Honeycomb
1. Remove screws and bottom retainer stripfrom front or rear interior of case.
NOTENote position of the honeycomb grid dur-ing removal so it can be reinstalled thesame way.
2. Remove honeycomb grid sections fromthe front or rear duct.
CAUTION
Improper installation of the honeycombgrid section could result in improper airflow and/or poor refrigeration.
3. After cleaning, replace honeycomb gridsections as they were removed andsecure with the bottom retainer strip andscrews.
Rear Air Duct Panels
1. Remove bottom trays and discharge airhoneycomb, see this page.
2. Remove mounting screws from rear ductpanel.
3. After cleaning, replace in reverse order.
Front Air Duct Panels
1. Remove bottom trays, see this page.
2. Remove screws and front air duct panelsfrom case.
3. After cleaning, replace in reverse order.
Corner Trim
1. See page 16 for corner trim removalinstructions.
2. After cleaning trim and cladding compo-nents, replace front and rear cladding andcorner trim components in reverse orderusing instructions below and on page 16.
Front & Rear Cladding
1. Remove kickplates and raceway coversfrom front and rear of case.
2. Remove screws from bottom and top offront and rear cladding and pull claddingdown to remove it from behind the bottomedge of the bumper retainer.
3. After cleaning, replace front and rearcladding and remaining components inreverse order.
Corner Trim Replacement(NFW/NCW/NFWG/NCWG w/wrap ends)(NFWE/NCWE end cases)
Since some of the corner trim fasteners arehidden, remove the trim and hardware in thefollowing sequence.
1. Remove kickplates (1) and kickplate cor-ner trim (2).
2. Remove raceway covers (3) from bothsides of the corner trim.
3. Remove four screws (4) and cladding cor-ner trim (5).
4. Remove two top screws (6) from racewaycorner trim (7), then lift and remove theraceway corner trim (7) from the retainersin the bottom slots.
5. Remove two bottom screws (8) and lift offthe bumper corner trim (9).
6. Replace bumper corner trim, raceway cor-ner trim, corner cladding trim, racewaycovers and kickplates in reverse order.
5. Install new defrost heater (6) in reverseorder.
6. Restore electrical power to case.
SERVICE INSTRUCTIONSSee “General-UL/NSF I&S Manual” for fanblade and motor replacement, color bandand bumper replacement and racewaycover removal instructions.
NSF Product ThermometerReplacement
1. Remove four screws (1) and thermometerbracket (2) from rear of case.
2. Remove two screws, nuts, washers andthe product thermometer (3) from thethermometer bracket (2).
3. Install and secure a new product ther-mometer (3) on the thermometer bracket(2) with two screws, washers and nuts.
4. Install thermometer bracket (2) on rear ofcase with four screws (1).
Installation & Service ManualNFW, NCW, NFWG, NCWG,
NFWE, NCWE
February, 2001 Page 17
Anti-Sweat ReplacementWARNING
Shut off or disconnect power supply tocase before changing an anti-sweat.Electrical power from wire ends coulddamage other components and/or causepersonal injury or death.
Discharge Air Grid Anti-Sweat (NFW/NCW)
1. Remove screws (1) retainer strip (2) anddischarge air grid (3) from interior of thefront case wall (4).
2. Remove mounting screws and supportassembly (5) from air grid opening.
3. Disconnect or cut the defective anti-sweatwire (6) from the case wires.
4. Remove and replace the aluminum tapeand defective anti-sweat wire (6) from topof support assembly (5).
5. Reconnect the anti-sweat wires andreplace the support assembly, dischargeair grid and mounting hardware.
Defrost Heater Replacement
WWAARRNNIINNGGAlways shut off electricity to case beforereplacing a defrost heater. Automaticcycling of fans or electrical power to wireends could cause personal injury and/ordeath.