SECTION KU - TROUBLE SHOOTING
FAILURE TO START
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PROBABLE CAUSE I
CORRECTION
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lPmvernotturnedon.
\Tmnthepowcx “ON” byclosingtiemah diwomect I
switch or circuit breaker.
Blown control circuit fbse.
Replace fuse. Find and correct cause.
4
Safety circuit shutdown resulting from high discharge
Correct the situation in accordance with the instructions
air temperature.
in the “High Discharge Air Temperature” section of this
trouble shooting guide. Restart the compressor.
Thermal overload relays tripping.
Correct the cause of the overloaded condition and press
the start button.
Low Voltage.
Ask the power company to make a voltage check at
your entrance meter, then compare that reading to a
reading taken at the motor terminals. Use these two
readings as a basis for locating the source of low
voltage.
]Faultv start switch.
lCheck the switch for malfimction or loose connections. I
]Povverfailure.57
lCheck power supply.
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]Faultv control relay.
lReplace relay.
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Loose wire connections.
Check all wiring terminals for contact and tightness.
Faulty High Air Temperature Switch.
Check HAT switch. Contact a qualii3ed serviceman for
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1repairs.
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lFaulty transformer.
lCheck secondary voltage on transformer.
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UNSCHEDULED SHUTDOWN
PROBABLE CAUSE
CORRECTIONS
High air discharge temperature.
Correct the situation in accordance with the instruction
in the “High Discharge Air Temperature” section of this
trouble shooting guide. Restart the compressor.
Thermal overload relays tripping.
Correct the cause of the overloaded condition and press
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Ithe start button.
Power failure.
Check power supply.
Faulty HAT switch.
Contact a qualifkxl serviceman for repairs.
Loose wire connections.
Check all wiring terminals for contact and tightness.
Faulty control relay.
Replace as necessary.
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