Analyzing Discharge Pressure - Koolaire STH045 8/15 Technician's Handbook

Analyzing Discharge Pressure

1. Determine the ice machine operating conditions:
Air temp. entering condenser
Air temp. around ice machine
Water temp. entering sump trough ______
2. Refer to "Cycle Times, 24 Hr. Ice Production and
Refrigerant Pressure Charts" on page 121 for ice
machine being checked.
Use the operating conditions determined in step 1 to
find the published normal discharge pressures.
Freeze Cycle
Harvest Cycle
3. Perform an actual discharge pressure check.
Beginning of
Cycle
Middle of
Cycle
End of
Cycle
4. Compare the actual discharge pressure (step 3)
with the published discharge pressure (step 2).
The discharge pressure is normal when the actual
pressure falls within the published pressure range for
the ice machine's operating conditions. It is normal for
the discharge pressure to be higher at the beginning of
the freeze cycle (when load is greatest), then drop
through out the freeze cycle.
68
______
______
Freeze
Cycle PSIG
__________
__________
__________
______
______
Harvest
Cycle PSIG
__________
__________
__________
Part Number STH045 8/15