new 60 Series Service Manual.rev. 06.01.16.docx - 35 –
Test Procedure for Compressor Electrical Components
1. Testing The Potential Relay:
2. Before testing the relay, be sure it is the one specified for use with the ice machine
compressor and the mounting position of the relay is correct.
3. Measure for continuity between terminals 5 and 2—if there is no continuity, replace the relay.
4. Measure for continuity between terminals 2 and 1—if there is no continuity, the contacts are
open and the relay must be replaced.
5. The relay may also malfunction if the supply voltage is 10% higher or lower than the rated
voltage or if the relay is loosely mounted, allowing it to vibrate or if it is used in conjunction
with an incorrect start capacitor.
Testing the Run Capacitor:
1. Before testing the run capacitor, be sure it is the one specified for use with the ice machine
compressor.
2. After making sure the capacitor is discharged, disconnect it and test the value with a
capacitance meter. If the measured value is more than 10% higher or lower than the rated
value, replace the run capacitor.
3. The capacitor may also malfunction if the supply voltage is more than 10% higher than the
rated voltage.
Testing the Start Capacitor:
1. Before testing the start capacitor, be sure it is the one specified for use with the ice machine
compressor.
2. After making sure the capacitor is discharged, disconnect it and test the value with a
capacitance meter. If the measured value less than the rated value or more than 20% higher
than the rated value, replace the start capacitor.
3. As an alternative, test the run capacitor by determining if there is continuity across the
terminals. Use a meter set to the R x 1 scale. If there is continuity the capacitor is shorted
and must be replaced.
4. Another alternative is to set the meter to the R x 100,000 scale. If there is no needle
deflection on an analog meter when placing the probes across the capacitor terminals or if
infinite resistance is indicated on a digital meter, the capacitor is open and needs to be
replaced.
5. The capacitor may also malfunction if the relay contacts are not working properly, or if the
capacitor is subjected to prolonged operation of the start cycle, because the start relay is
incorrect, the starting load is too high, or the supply voltage is more than 10% lower than the
rated voltage.
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