Troubleshooting
AVOID INJURY. The compressor’s elapsed time meter contains a lithium
battery. Do not remove the battery. Do not recharge, disassemble, mutilate, wet
or dispose of the meter in fire. Contact local environmental authorities for proper
disposal of the lithium battery.
Compressor Capsule
Compressor motor checks for winding continuity, resistance and grounding will isolate most
motor electrical problems. Current measurements will separate a locked rotor condition from
other electrical problems. When the checks indicate a faulty compressor, a replacement is
needed. Contact a SCAI Service Center.
AVOID ELECTRIC SHOCK. Disconnect the power to the compressor before
troubleshooting the electrical components.
AVOID INJURY FROM BURNS. During operation, some surfaces under the
compressor’s cover become hot. Allow the compressor to cool for 1/2 hour after
shutdown before removing the cover for maintenance.
AVOID ELECTRIC SHOCK. Permit only qualified electrical technicians to open
electrical enclosures, to perform electrical checks or to perform tests with the
power supply connected and wiring exposed. Failure to observe this warning can
result in serious injury or death.
Winding Continuity, Grounding and Resistance Checks
Tools required: Ohmmeter or multimeter
#2 Phillips screwdriver.
1. Disconnect the power to the compressor.
2. Remove the compressor’s cover.
3. Remove the terminal box cover from the top of the compressor motor to expose the three
terminals M, S, and C. See Figure 7. Disconnect wires 7, 8, and 9 from terminals C, M,
and S respectively.
4. With an ohmmeter, check the resistance across compressor terminals C and M. Resistance
should be 0.8 to 1.2 ohms. If the resistance is outside this range, consult a SCAI Service
Center. If there is no continuity, the winding is open. Consult a SCAI Service Center.
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