Omcan IC-CN-0040, Инструкция по эксплуатации

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17
Troubleshooting
compressor.
DISCONNECT POWER BEFORE SERVICING!
If the compressor uses an internal overload, be certain that the compressor has cooled and the overload
has reset before diagnosing the compressor. If the compressor is cool and is still not running, check the
compressor motor windings by first removing the wires at the compressor terminals. With an ohmmeter, check
for continuity between all three terminals, if an open circuit exists between any of the terminals, the compressor
may need to be replaced. Check for continuity from each terminal to the compressor body, if continuity is found
from any terminal to the compressor body, the compressor windings are shorted to ground and the compressor
will need to be replaced. If the compressor appears to be good at this point, it is advisable to use a compressor
analyzer to isolate the compressor from the start components while checking for a locked rotor. If it is not
available, the compressor starting components must be checked. If all starting components are working, check
the amp rating from the 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 amp rating, (see
locked rotor amps on compressor tag) the compressor has a locked rotor and should be replaced.
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.
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 productivity 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 working. 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.
Thermostatic Expansion Valve (TXV)
The thermostatic expansion valve measures the flow of refrigerant into the evaporator changing its state