N7DNL, NHD
INSTALLATION PROCEDURES
Carpentry Procedures
Case Pull-Up Locations
All the N7DNL and NHD models have four
pull-ups at each end of the case. Pull-ups A,
B, C and D are located as shown and should
be installed and tightened starting with A and
finishing with D.
NOTE
If extra pull-up bolts are needed, use the
bolts from the side shipping supports.
See “General-UL/NSF I&S Manual” for
line-up assembly instructions.
Electrical Procedures
Electrical Considerations
CAUTION
Make sure all electrical connections at
components and terminal blocks are tight.
This will prevent burning of electrical
terminals and/or premature component
failure.
NOTE
Raceway covers will be shipped loose.
See the “General-UL/NSF I&S Manual” for
raceway cover installation and removal
instructions.
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 (NHD models only). On gas
defrost cases the fans circuit is controlled by
a klixon.
Fluorescent Lamp Circuit
The standard lighting for N7DNL and NHD
cases is 2 rows of T-8 canopy lights. Optional
T-8 Nose Light is available on all models,
while T-8 shelf lighting is only available on
the NHD models.
Defrost Information
See “General-UL/NSF I&S Manual” for
operational descriptions for each type of
defrost control.
Defrost Control Charts
N7DNL Models
Defrost
Defrost Defrosts Duration Term.
Type Per Day (Min) Temp.
Off Time 6 19 ------
The N7DNL cases do not have any klixons.
NHD Models
Defrost
Defrost Defrosts Duration Term.
Type Per Day (Min) Temp.
Off Time 4 24 ------
Electric 4 24 41°F
Gas 4 15 55°F
Most klixons are located on the right end of
the evaporator coil.
NOTE
The Gas Defrost Termination klixon is
located at the by-pass 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.
June, 2007Page 8
