AAON HA-50 - Manual (Page 9)

9
STUCK COMPRESSOR
MOTOR WINDING OPEN
COMPRESSOR RUNS
REVERSE LEADS
CHECK UNIT FUSES
AND WINDING
GROUNDED WINDING
INTERNAL
OVERLOAD OPEN
REPLACE
COMPRESSOR
COMPRESSOR CHECKOUT PROCEDURE
NO POWER TO
CONTACTOR
POWER TO
UNIT
NO POWER TO
UNIT
COMPRESSOR
WON'T RUN
CHECK CIRCUIT BREAKER AT
POWER DISTRIBUTION PANEL
NO 24 VOLT POWER
TO HOLDING COIL
CONTACTOR
OPEN
POWER TO HOLDING COIL HOLDING COIL BURNED OUT REPLACE CONTACTOR
BROKEN OR LOOSE CONTROL
TRANSFORMER OPEN
COMPRESSOR LOW AMBIENT LOCKOUT OPEN
(TEMPERATURE OUTSIDE BELOW 55 DEG.)
HI PRESSURE SWITCH OPEN
LO PRESSURE SWITCH OPEN
THERMOSTAT NOT CALLING FOR COOLING
CONTROL PANEL NOT SET FOR COOLING
COMPRESSOR
DOESN'T RUN
REPLACE
COMPRESSOR
REPLACE
COMPRESSOR
MOTOR
WINDING OPEN
POWER TO
COMPRESSOR
ALL 3 LEGS
COMPRESSOR
DOESN'T HUM
IF COMPRESSOR DOME IS HOT,
IT MAY BE LOCKED OUT ON
INTERNAL OVERLOAD.
WAIT FOR RESET, IT COULD TAKE
AS LONG AS 2 HOURS.
REPLACE LEADS BROKEN LEADS
NO POWER TO
COMPRESSOR
COMPRESSOR
HUMS
CONTACTOR
CLOSED
POWER TO CONTACTOR
ALL 3 LEGS
LOW AIR (CONDENSER)
OVERCHARGE OF REFRIGERANT
AIR IN SYSTEM
DIRTY CONDENSER COIL
HIGH HEAD
PRESSURE
LOW HEAD
HIGH SUCTION
PRESSURE
DEFECTIVE COMPRESSOR VALVES
LOW AIR (EVAPORATOR)
LOW REFRIGERANT CHARGE
LOW
SUCTION
PRESSURE
RESTRICTED FEEDER TUBE
BAD EXPANSION VALVE POWER ELEMENT
REPLACE COMPRESSOR
CHECK FILTERS,
OR DIRTY EVAPORATOR COIL
OR LOOSE BELT
COMPRESSOR RUNS
OR
COMPRESSOR CYCLES
(Poor Cooling)
CHECK COMPRESSOR
ROTATIONAL
DIRECTION