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NFX, NFSX, NCSX, 

NFSGX, NCSGX

Page 8

November, 2007

toggle switch is flipped, the solenoid closes
directing the flow through the EPR valve.  If
the EPR valve is set for 48 psig, the evapora-
tor will see a coil temperature of 12°F and will
operate at a discharge air temperature of
about 22°F.

When gas defrost is used, an additional
check valve is mounted around the EPR valve
to allow reverse flow for the defrosting gas.  
A fan delay is also connected with gas defrost
to cycle the fans off, but only during the 
medium temperature mode.

Electrical Procedures

Electrical Considerations

CAUTION

Make sure all electrical connections are
tight.  This prevents burning of electrical
terminals and/or premature component
failure.

NOTE

The raceway houses the electrical wiring
and components for the case.  All raceway
covers will be shipped loose.

Case Fan Circuit

This circuit is to be supplied by an uninter-
rupted, protected 120V circuit.  The case fan
circuit is not cycled, except when equipped
for gas defrost.  On gas defrost cases the fan
circuit is controlled by a 50/40 klixon when
used for medium temperatures.

NOTE

With gas defrost, the fans will not start
until the coil temperature reaches 40°F at
the fan delay klixon.

Anti-Sweat Circuit

All cases have at least one anti-sweat heater
in each discharge air grid and return air grid.
Cases with front glass have an additional 
anti-sweat heater under the glass retainer.
Anti-sweat heaters are wired directly to the
main power supply so they can operate at 
all times.

Defrost Information

See “General-UL/NSF I&S Manual” for 
operational descriptions for each type of
defrost control.

Defrost Control Chart 

NFX/NFS(G)X/NCS(G)X

Defrost

Defrost

Defrosts Duration

Term.

Type         Per Day      (Min)        Temp.
Electric/FF

1

60

50°F

Elec/IC/MED 1

36

50°F

Gas/FF

2-3

20-25

55°F

Gas/IC

1

25-30

55°F

Gas/MED

2-3

16-20

55°F

Most klixons are located on the end of the
evaporator coil.  Klixon uses are as follows:
Electric Defrost Termination, Electric Defrost
Failsafe (Opt.), Gas Defrost Fan Delay (Dual
Temp) and Glass Anti-Sweat (Dual Temp).

NOTE

The defrost termination klixon for gas
defrost is located at the bypass check
valve.

CAUTION

If electronic sensors are used in place of
the klixons, the sensors must be located 
in the same location as the klixons for that
defrost type.  Any other locations will effect
the refrigeration efficiency of the case.

WIRING DIAGRAMS

ELECTRICIAN NOTE - OVERCURRENT 

PROTECTION

120V circuits should be protected by 15 or 20 Amp
devices per the requirements noted on the cabinet
nameplate or the National Electrical Code, Canadian
Electrical Code - Part 1, Section 28.  208V defrost 
circuits employ No. 12 AWG field wire leads for field
connections.  On remote cases intended for end to
end line-ups, bonding for ground may rely upon the
pull-up bolts.

The following wiring diagrams on pages 9 thru
11 will cover the NFX/NFSX/NCSX/NFSGX/
NCSGX case circuits and dual temp circuits
with electric and hot gas defrost options.

Summary of Contents for NCSGX

Page 1: ...ture Reference This merchandiser conforms to the American National Standard Institute NSF International Health and Sanitation standard ANSI NSF 7 2003 PRINTED IN Specifications subject to REPLACES ISSUE PART IN U S A change without notice EDITION 1 06 DATE 11 07 NO 9037163 REV C Tyler Refrigeration Niles Michigan 49120 OPEN WELL FROZEN FOOD ICE CREAM MERCHANDISERS Low Temperature Self Serve Displa...

Page 2: ...ual Temperature Control 7 Electrical Procedures 8 Electrical Considerations 8 Defrost Information 8 Defrost Control Chart 8 Installation Procedure Check Lists See General UL NSF I S Man Wiring Diagrams 8 NFX NFSX NCSX NFSGX NCSGX Domestic Export 50 Hz Case Circuits 9 Dual Temperature Control Circuits 11 Cleaning and Sanitation See General UL NSF I S Manual Component Removal and Installation Instru...

Page 3: ...ZEN FOOD MERCHANDISER NCSGX 8 12 GLASS FRONT OPEN WELL ICE CREAM MERCHANDISER Page Service Instructions Preventive Maintenance See General UL NSF I S Manual Fan Blade and Motor Replacement See Gen UL NSF I S Manual Color Band and Bumper Replacement See Gen UL NSF I S Man NSF Product Thermometer Replacement 14 Defrost Heater Replacement 14 Anti Sweat Replacement 15 Front Glass Replacement NFSGX NCS...

Page 4: ...NFX NFSX NCSX NFSGX NCSGX Page 4 March 2008 SPECIFICATIONS NFX NFSX NCSX NFSGX NCSGX Open Well FF IC Merchandisers ...

Page 5: ...Installation Service Manual NFX NFSX NCSX NFSGX NCSGX March 2008 Page 5 ...

Page 6: ...NFX NFSX NCSX NFSGX NCSGX Page 6 March 2008 ...

Page 7: ... can be installed after the cases have been joined 1 Install partition brackets 1 at case joint on front center and or rear case wall 2 with screws 3 2 Slide plexiglas partitions 4 into partition brackets 1 Trim Installation Alignment See General UL NSF I S Manual for bumper color band raceway and kickplate installation Refrigeration Procedures See General UL NSF I S Manual for general system cont...

Page 8: ...eat heater under the glass retainer Anti sweat heaters are wired directly to the main power supply so they can operate at all times Defrost Information See General UL NSF I S Manual for operational descriptions for each type of defrost control Defrost Control Chart NFX NFS G X NCS G X Defrost Defrost Defrosts Duration Term Type Per Day Min Temp Electric FF 1 60 50 F Elec IC MED 1 36 50 F Gas FF 2 ...

Page 9: ...November 2007 Page 9 NFX NFSX NCSX NFSGX NCSGX Domestic Export 50 Hz Case Circuits ...

Page 10: ...Page 10 November 2007 ...

Page 11: ...November 2007 Page 11 Dual Temperature Control Circuits ...

Page 12: ...Page 12 November 2007 ...

Page 13: ...e honeycomb grid section could result in improper air flow and or poor refrigeration 3 After cleaning replace honeycomb grid sections as they were removed and secure with the bottom retainer strip and screws Rear Duct Panels 1 Remove bottom trays and discharge air honeycomb see this page 2 Remove mounting screws from rear duct panel 3 After cleaning replace in reverse order Front Air Duct Panels 1...

Page 14: ... nuts 4 Install thermometer bracket 2 on rear of case with four screws 1 Defrost Heater Replacement WARNING Always shut off electricity to case before replacing a defrost heater Automatic cycling of fans or electrical power to wire ends could cause personal injury and or death 1 Remove bottom trays from case 2 Unclip and lift up fan plenum 1 3 Disconnect defective defrost heater 2 and remove from ...

Page 15: ...1 Unplug or disconnect heated glass panels and glass retainer anti sweat wires 1 2 Remove two screws 2 and glass joint trim 3 from both joints of the broken glass 4 3 Remove screws 5 and glass trim rail 6 from top of glass 4 4 Loosen rear retainer 7 and remove broken glass 4 from glass retainer assembly 8 NOTE Inspect the anti sweat wire in glass retainer assembly If wire is damaged or broken repl...

Page 16: ... 4 5105037 4 12 Return Air Duct Joint Trim 5203017 5203017 13 Hand Rail Backer 9025316 9025316 14 Color Band Backer Ptd 9040223 9040223 NFX NFSX NCSX 15 Bumper Backer color per order 16 Horizontal Joint Trim 5127503 5127503 17 Cladding Retainer 9300197 4 9300197 4 Screw 5183536 8 5183536 8 18 Raceway Cover Backer color per order 19 Raceway 9300218 9300219 Screw 5183536 18 5183536 18 Kickplate Hang...

Page 17: ...9 Bumper color per order 30 Color Band Ptd NFX NFSX NCSX 9023798 9023800 31 Bumper Retainer Hand Rail color per order Bumper Retainer 9025058 9025061 32 Bumper End Trim color per order 33 Glass Trim NFSGX NCSGX 9031808 9031808 34 Screw 5048626 2 5048626 2 35 Color Band Ptd NFSGX NCSGX 9020971 9020972 Color Band Backer NFSGX NCSGX 9025982 9025982 ...

Page 18: ...05279 Opt ECM Fan Blades 6 25 1 4 3B 9025138 9025138 Anti Sweat Heater Wire Hi Watt 5124818 5124819 5081149 5081150 Lo Watt 5124216 5124217 5081147 5081148 glass retainer 5218331 5218332 5081149 5081150 NFSGX NCSGX Electric Def Heater 5960934 5960935 5088278 5088279 Electric Def Term Klixon 5125211 5125211 5125211 5125211 Opt Gas Def Fan Delay Klixon 9023503 9023503 9023503 9023503 Opt Gas Def Ter...

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