Tyler Advantage NFNX, Installation & Service Manual

Defrost Information

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

Defrost Control Chart 

NFNX/NCNX/NFNGX/NCNGX

Defrost

Defrost

Defrosts

Duration

Term.

Type       

Per Day  

(Min)    

Temp.

Electric/FF

1

60

50°F

Electric/IC

1

36

50°F

Electric/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

E = Electric Defrost Termination
F/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 the
evaporator coil.  The diagram shows the 
location for each defrost type that uses a
klixon.

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 12 will cover the NFN(G)X/NCN(G)X 
case circuits and dual temp circuits with 
electric and hot gas defrost options.

November, 2007

Page 8

NFNX, NCNX, NFGNX,

NCNGX