TROUBLE SHOOTING GUIDE
36
PRIMARY COMPRESSOR NOT STARTING
If the Primary Compressor fails to start, the reason for the failure needs to be determined before attempting to condemn the
system. There are a few things that can cause this failure:
1. Check the compressor starting gear with power disconnected to the system.
a. an ohm reading across the contactor contacts for both Primary Compressor contactors. Ensure
that both sets of contacts on each contactor are engaging when the armature is pulled in. Ensure both contacts are
disengaging when the armature is not pulled in.
b. Remove the wires from the start and run capacitors to isolate them. With a Capacitance tester, test these for the correct
MFD or UF rating that is marked on the side of the component.
IMPORTANT:
capacitor being open, shorted, or neither open or shorted.
c. With the capacitor wires still removed and not touching anything or the metal of the electrical box, test both Potential
e. Readings need to be taken
from 5-2 terminals (coil) and 2-1 terminals (contacts). The contacts are a normally closed set of contacts and the coil should
See Figure 14, Appendix B.
(NOTE) For more precise measurement readings, contact Hallowell International Technical Support.
2. If a compressor starting is tripping the circuit breaker, contact Hallowell International Technical Support.
BOOSTER COMPRESSOR NOT STARTING
1. Check the compressor starting gear with power disconnected to the system.
a.
contactor are engaging when the armature is pulled in. Ensure both contacts are disengaging when the armature is not
pulled in.
b. Remove the wires from the start and run capacitors to isolate them. With a Capacitance tester, test these for the correct
MFD or UF rating that is marked on the side of the component.
IMPORTANT: ing; the only thing that can be gathered is the
capacitor being open, shorted, or neither open or shorted.
c. With the capacitor wires still removed and not touching anything or the metal of the electrical box, test the Potential relay
Readings need to be taken from 5-2 terminals (coil) and 2-1 terminals (contacts). The contacts are
a normally closed set of contacts and the See Figure 14, Appendix B.
(NOTE) For more precise measurement readings, contact Hallowell International Technical Support.
2. If a compressor trying to start trips the circuit breaker, contact Hallowell International Technical Support.
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