Tyler Refrigeration NCSGX, Installation & Service Manual

Page: 7 / 18

Installation & Service Manual
NFX, NFSX, NCSX,
NFSGX, NCSGX
January, 2006 Page 7
INSTALLATION PROCEDURES
Carpentry Procedures
Case Pull-Up Locations
The NFX/NFSX/NCSX/NFSGX and NCSGX
models have two pull-ups at each end of the
case. Pull-ups A and B are located as shown
and used for joining all cases.
1” Solid Partition
A 1” insulated partition is required between
adjacent gas defrost cases that are on different
refrigeration systems. 1” partitions are shipped
installed as specified in the case order. Make
sure the partitioned case is being installed in
the proper location in the case line-up. This
assures proper refrigeration to all parts of the
case line-up.
Apply sealant to outside surface of partition
where the two surfaces of the adjoining case
will contact the partition.
See “General-UL/NSF I&S Manual” for
line-up assembly instructions.
After all case pull-ups have been secured, all
interior wall joint seams should be sealed with
duct tape.
Plexiglas Partition
A plexiglas plug partition is required on adja-
cent electric defrost cases that are on different
refrigeration systems. These partitions 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, control and superheat
information.
Optional Dual Temperature Control
The dual temperature control unit is a factory
installed option. This control allows the user
to easily switch from medium to low tempera-
ture operation by flipping a switch. The dual
temperature 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. The
toggle switch opens or closes this solenoid.
When the solenoid is open, the evaporator is
connected directly to the compressor suction
that allows for low temperature operation.
When the solenoid is closed, the evaporator
must operate through the EPR valve which
has been preset to the desired medium
temperature.
EXAMPLE: R-404A system with 12 psig of
suction pressure
. With the suction line sole-
noid open, the coil pressure operates at 12
psig with a temperature of -29°F. When the