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The following compressor checklist is provided to analyze the compressor and determine if it is
operating properly or if it is faulty:
1. Electrical Service Panel – turn power off.
a. Check circuit connections for tightness
b. Circuit breaker sized right?*
c. Wire size correct?*
2. Check start and run capacitors or other start components for bulges, overheating or
loose connections.
3. Test capacitors and start components and replace if necessary. Capacitors can be
checked by substitution.
4. Check incoming power supply voltage to determine whether it is within acceptable
voltage range.* (See Figure 39)
5. Check voltage at compressor unit terminals to determine whether it is within
acceptable voltage range.* (See Figure 39)
6. Running Amperage. Connect a clip-on type ammeter to the (common) lead to the
compressor. Turn on the supply voltage and energize the unit. The compressor will
initially draw high amperage; it should soon drop to the RLA value (See Figure 7) or less.
If the amperage stays high, check the motor winding resistance.
Note: Feel the top of the compressor to see if it has overheated. If it is hot, the internal
overload may be open. You may have to wait several hours for it to reset.
If the compressor draws a high amperage and does not start (amperage is approximately
locked rotor amperage – LRA (See Figure 7)), the compressor is locked mechanically
and should be removed from the system.
SD-410-QS (H) (06/15)
Figure 39. Compressor Unit Voltage Information
Page 51
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