Check UL1 Cylinders
refrigeration
Description
A problem was detected in the front cylinder head of the compressor; alarm only.
Activation Conditions
A problem has been detected inside the front cylinder head of the compressor with a cylinder suction valve, cylinder discharge valve, head gasket or valve plate gasket.
Unit Behavior
Alarm Only
Reset Conditions
Auto reset if Pretrip is started again, or alarm may be manually reset using the display mounted keys or by turning the unit off, then back on again.
Corrective Actions
1. Check Refrigerant Charge: Refer to Section 8.7.2. 2. Check System Pressures: Install manifold gauge set to check and compare actual compressor discharge and suction pressures with those shown in Unit Data. Refer to Section 8.9.10 for instruction on comparison. 3. Check Compressor Front Head Cylinder Valves and Gaskets: Remove compressor front head and inspect condition of cylinder suction valves, cylinder discharge valves and gaskets. Must be in good condition. Refer to Section 8.8.