Scotsman BC0530 Service Manual page 31

BC0530 Service Manual
Additional Service Information
Testing the External Thermal Protector:
1. After allowing sufficient time for the thermal
protector to reset, disconnect it and test for
continuity across the terminals. If there is no
continuity, replace the thermal protector.
2. Disconnect and test the compressor wiring by
confirming that there is continuity between relay
terminal 5 and compressor terminal C and also
between terminals 2 and S as well as 4 and R.
3. Replace the potential relay if all other tests do not
reveal the problem. A new relay will eliminate any
electrical problems that cannot be determined
with the previous testing. If a new relay does not
correct the operation, the compressor may have a
mechanical problem.
Note: Excessive short cycling may be caused by a
faulty thermal protector, but it also may be caused by
other malfunctioning system components such as the
bin thermostat, Ice-Off-Wash switch, and contactor or
high pressure cut-out.
March 2020
Page 31