Ice-O-Matic ICE0250 Series - Manual (Page 75)

ICE Series Electrical System
Page F2
Compressor Check (Continued)
If all starting components are good, check the voltage from the common terminal of the
compressor, making sure proper voltage is supplied to the compressor and all wiring is properly
connected. If the compressor does not start and there is excessive amperage draw, (see locked
rotor amps on compressor tag) the compressor has a locked rotor and should be replaced.
Important: Compressors returned to the factory for warranty are tested and will not be covered
under the warranty policy if they are not defective.
Overload (External)
If there is no amperage draw check the compressor overload. The compressor overload can be
checked for continuity after removing it from the compressor and letting it cool to room
temperature. If there is no continuity between the two terminals, replace the overload. If the
overload is suspected of opening prematurely, it should be replaced with an overload, which is
known to be good.
Capacitors
The start capacitor is an electrical storage device used to provide starting torque to the
compressor. If a start capacitor is defective, the compressor will not start properly.
The run capacitor is an electrical storage device used to improve the running characteristics and
efficiency of the compressor.
Before checking a capacitor, it should be discharged by shorting across the terminals. If a run or
start capacitor is cracked, leaking or bulging it should be replaced. If a capacitor is suspected of
being defective, it can easily be checked by replacing it with a capacitor of the correct size, which
is known to be good. If the compressor starts and runs properly, replace the original capacitor. A
capacitor tester can also be used.
Start Relay
The start relay breaks the electrical circuit to the start windings when the compressor motor speed
increases. If the relay is defective, the compressor will not start or it may start but will run for a
very short time.
A compressor relay can be checked by removing the relay and checking the relay contacts for
damage and check for continuity across the closed relay points. Check the relay coil with an
ohmmeter. If no continuity is read, replace the relay.