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INSTALLATION AND SERVICE MANUAL 959R
184981-02
21
8.2 Refrigeration Settings - Bristol Compressors
WATER COOLED FREEZERS
Figure 8-2 Water cooled freezer settings
Figure 8-3 Air cooled remote freezer settings
AIR COOLED REMOTE FREEZER SETTINGS
1
. 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 counterclock-
wise. Do not turn more than 1/8 turn
at a time or more than 0.5 psig
change in suction pressure. Let the
unit operate a sufficient length of time
— at least two minutes — to properly
read the adjustment.
2. On self-contained water-cooled
freezers:
a. Check the refrigeration pressure
settings with the gauges attached to
the service valves on the compressor
and receiver tank. Adjust to the
proper settings (See Figure 8-2.)
3. On air cooled remote freezers:
a. Refrigerant does not need to be
added or removed at inst allation,
or as the seasons change. The
freezer, condenser, and line sets
are factory charged with the proper
amount of refrigerant for all ambi-
ent conditions and for either 25 f t.
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, evacu-
ate the system, and recharge with
10.5 lb. of R404a.
b. Operate the freezer until the
system stabilizes before adjusting
pressures. Adjust to proper set-
tings (See Figure 8-3)
Refrigerant Model Cylinder
Suction
Head Pressure
Water Cooled
R-404a 959R 16-
17 psig
235-240 psig
Fan Control
Refrigerant Model Cylinder
Suction
Discharge Head
Pressure
Control Valve
Cut-in Diff.
R-404a
959R
16-17 psig 250-350 psig 250
245 20