Scotsman C2648 - Pressure Switch Testing; High Pressure Switch Test; Transformer Voltage Check; Controller Function Confirmation

C2648 Prodigy and Prodigy Plus Service Manual
January 2015
Page 50
Pressure switch
High pressure cut out. The high pressure cut out switch will open at a preset pressure, shutting off power to
the compressor contactor. After the pressure has fallen to another preset level, the switch will re-close and the
contactor coil will be energized.
To Test High Pressure Switch:
A. Attach refrigeration gauge set to high side port.
B. Disconnect leads to fan motor.
C. Measure voltage at high pressure control.
D. Switch ice machine on, observe pressure that the pressure control opens at, compare to spec. Allow system
to equalize, observe the pressure that the pressure control closes at, compare to spec.
Transformer
Check secondary voltage, it must be between 10 and 15.5 AC volts. Replace if no voltage is output or if above
or below the acceptable voltage..
Controller
The controller’s software operation is conrmed if it is functioning. Execute the test to conrm its operation of
the loads. Illumination of a diagnostic code (other than E) is not an indication of controller failure. Each code
requires its own diagnosis.