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INSTALLATION AND SERVICE MANUAL 917N-CMT, 927CMT, 957CMT
184617-02
8.2 Refrigeration Settings
1. On self-contained air or water-
cooled freezers:
a. Check the refrigeration pressure
settings with the gauges attached to
2. On air-cooled remote freezers:
a. Refrigerant does not need to be added or removed at installation, or as the
seasons change. The freezer, condenser, and line sets are factory charged with
the proper amount of refrigerant for all ambient conditions and for either 25 ft. or
50 ft. line lengths. The total system charge is 10.5 lb. of R404a. If a leak is found,
recover the refrigerant, repair the leak, evacuate the system, and recharge with
10.5 lb. of R404a.
b. Operate the freezer until the system stabilizes before adjusting pressures. Adjust
to proper settings (See Figure 8-3.)
A refrigeration test gauge must be used when adjusting the suction pressure. To
reduce the suction pressure, turn the adjustment screw on the expansion valve
counterclockwise. Do not turn more than ¼ turn at a time. Let the unit operate a
sufficient length of time — at least two minutes — to properly read the adjustment.
Figure 8-3 Air-cooled remote freezer settings
AIR-COOLED REMOTE FREEZER SETTINGS
Figure 8-2 Self-contained freezer settings
SELF-CONTAINED FREEZERS
Refrigerant Model Cabinet
Suction
Cylinder
Suction
Head
Pressure
Head Pressure
Control Valve
Setting
Fan Control
Cut-in Diff.
Bristol Compressors
R-404a
917N-CMT
10-12
17-19
250-350 psig
250 psig
245
20
R-404a
957CMT
10-12
17-19
250-350 psig
250 psig
245
20
R-404a
927CMT
10-12
17-19
250-350 psig
250 psig
245
20
Maneurop Compressors
R-404a
917N-CMT
10-12
15-17
250-350 psig
250 psig
245
20
R-404a
957CMT
10-12
15-17
250-350 psig
250 psig
245
20
R-404a
927CMT
10-12
15-17
250-350 psig
250 psig
245
20
Tecumseh Compressors
R-404a
917N-CMT
10-12
16-18
250-350 psig
250 psig
245
20
R-404a
957CMT
10-12
16-18
250-350 psig
250 psig
245
20
R-404a
927CMT
10-12
16-18
250-350 psig
250 psig
245
20
Refrigerant Model Cabinet
Suction
Cylinder
Suction
Head
Pressure
Head Pressure
Control Valve
Setting
Fan Control
Cut-in Diff.
Bristol Compressors
R-404a
917N-CMT
10-12
17-19
250-350 psig
250 psig
245
20
R-404a
957CMT
10-12
17-19
250-350 psig
250 psig
245
20
R-404a
927CMT
10-12
17-19
250-350 psig
250 psig
245
20
Maneurop Compressors
R-404a
917N-CMT
10-12
15-17
250-350 psig
250 psig
245
20
R-404a
957CMT
10-12
15-17
250-350 psig
250 psig
245
20
R-404a
927CMT
10-12
15-17
250-350 psig
250 psig
245
20
Tecumseh Compressors
R-404a
917N-CMT
10-12
16-18
250-350 psig
250 psig
245
20
R-404a
957CMT
10-12
16-18
250-350 psig
250 psig
245
20
R-404a
927CMT
10-12
16-18
250-350 psig
250 psig
245
20
the service valves on the compres-
sor and receiver tank. Adjust to the
proper settings (See Figure 8-2.)