MODEL PCA090480WH
CHAPTER 3
TROUBLESHOOTING
Section 4: Troubleshooting Refrigeration System
3-4
March 2013
Page 82
Proprietary/Confidential
© 2013 Twist, Inc.
Trouble XII
U
: Refrigerant discharge pressure too high
PROBABLE CAUSE
SUGGESTED REMEDY
1.
Obstructed air to the condenser coils
1. Clean coils.
2. Air or other non-condensable gases in
the system
1.
Reclaim refrigerant, check system
for leaks, remove non-condensable
from gas, and re-charge system.
3. Excessive refrigerant charge
1. Reclaim system and re-install proper
amount of refrigerant.
1.
Check circuit breakers, overloads,
and magnetic contactors.
Repair/replace components as
necessary.
2. Check control circuit to ensure that
control power is available.
3. Check fan cycling switch to ensure
status of voltage and condition of
switch.
4. Check fan blade assembly for proper
mounting. Retighten hub onto shaft
if necessary.
4. Condenser fan not operating
5. Repair/replace fan motor as
necessary.
5. Ambient
temperature above design
condition
1. Unit will automatically shut-down
compressor. High Pressure Switch
is a automatic reset switch.
6. Restriction in discharge line to
condenser
1. Reclaim refrigerant and remove
restriction in line. Re-charge system
and test.
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