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Refrigeration Settings - H.C Duke & Son Freedom 360 Degrees Series Operator’s Manual With Illustrated Parts List

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INSTALLATION AND SERVICE MANUAL 917N-CMT, 927CMT, 957CMT
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8.2

Refrigeration Settings

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A refrigeration test gauge must be used when adjusting the suction pressure. To
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reduce the suction pressure, turn the adjustment screw on the expansion valve
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counterclockwise. Do not turn more than ¼ turn at a time. Let the unit operate a
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sufficient length of time — at least two minutes — to properly read the adjustment.
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1. On self-contained air or water-
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a. Check the refrigeration pressure
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
Refrigerant
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
Bristol Compressors
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R-404a
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R-404a
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R-404a
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Maneurop Compressors
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R-404a
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R-404a
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
R-404a
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
Tecumseh Compressors
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R-404a
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
R-404a
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
R-404a
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
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Figure 8-2 Self-contained freezer settings
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2. On air-cooled remote freezers:
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a. Refrigerant does not need to be added or removed at installation, or as the
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
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b. Operate the freezer until the system stabilizes before adjusting pressures. Adjust
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
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Refrigerant
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
Bristol Compressors
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R-404a
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R-404a
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
R-404a
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
Maneurop Compressors
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
R-404a
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
R-404a
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
R-404a
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
Tecumseh Compressors
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1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6
R-404a
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R-404a
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R-404a
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Figure 8-3 Air-cooled remote freezer settings
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22
cooled freezers:
settings with the gauges attached to
SELF-CONTAINED FREEZERS
Model
Cabinet
Suction
917N-CMT
10-12
957CMT
10-12
927CMT
10-12
917N-CMT
10-12
957CMT
10-12
927CMT
10-12
917N-CMT
10-12
957CMT
10-12
927CMT
10-12
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.
to proper settings (See Figure 8-3.)
AIR-COOLED REMOTE FREEZER SETTINGS
Model
Cabinet
Suction
917N-CMT
10-12
957CMT
10-12
927CMT
10-12
917N-CMT
10-12
957CMT
10-12
927CMT
10-12
917N-CMT
10-12
957CMT
10-12
927CMT
10-12
the service valves on the compres-
sor and receiver tank. Adjust to the
proper settings (See Figure 8-2.)
Cylinder
Head
Suction
Pressure
17-19
250-350 psig
17-19
250-350 psig
17-19
250-350 psig
15-17
250-350 psig
15-17
250-350 psig
15-17
250-350 psig
16-18
250-350 psig
16-18
250-350 psig
16-18
250-350 psig
Cylinder
Head
Suction
Pressure
17-19
250-350 psig
17-19
250-350 psig
17-19
250-350 psig
15-17
250-350 psig
15-17
250-350 psig
15-17
250-350 psig
16-18
250-350 psig
16-18
250-350 psig
16-18
250-350 psig
Head Pressure
Fan Control
Control Valve
Cut-in
Setting
250 psig
245
250 psig
245
250 psig
245
250 psig
245
250 psig
245
250 psig
245
250 psig
245
250 psig
245
250 psig
245
Head Pressure
Fan Control
Control Valve
Cut-in
Setting
250 psig
245
250 psig
245
250 psig
245
250 psig
245
250 psig
245
250 psig
245
250 psig
245
250 psig
245
250 psig
245
Diff.
20
20
20
20
20
20
20
20
20
Diff.
20
20
20
20
20
20
20
20
20
184617-02
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