Xvi. troubleshooting, Xvii. troubleshooting, Cooling trouble shooting chart – Comfort-Aire TGRG Series for R-410A User Manual

Page 60: Warning, Figure 38 60

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104

WARNING

!

DISCONNECT ALL POWER TO UNIT BEFORE SERVICING. CONTACTOR MAY BREAK ONLY ONE SIDE. FAILURE
TO SHUT OFF POWER CAN CAUSE ELECTRICAL SHOCK RESULTING IN PERSONAL INJURY OR DEATH.

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Unit will not run

• Power off or loose electrical connection

Check for correct voltage at compressor contactor in control
box

• Thermostat out of calibration-set too high

Reset

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• High pressure control open (if provided)

Reset-also see high head pressure remedy-The high pressure
control opens at 610 PSIG

• Interconnecting low voltage wiring damaged

Replace thermostat wiring

Condenser fan runs, compressor

• Run or start capacitor failed (single phase only)

Replace

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• Start relay defective 9single phase only)

Replace

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check & tighten all connections

• Compressor stuck, grounded or open motor winding

Wait at least 2 hours for overload to reset.

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• Air, non-condensibles or moisture in system

Recover refrigerant, evacuate & recharge, add filter drier

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Remove or replace defective component

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expansion device or liquid line

Circulating air blower & inducer

• Manual reset overtemperature control

Reset or replace

run continuously,

• tripped

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COOLING TROUBLE SHOOTING CHART

XVII. TROUBLESHOOTING

FIGURE 59

COOLING TROUBLE SHOOTING CHART

XVI. TROUBLESHOOTING

FIGURE 38

60

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