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PROBLEM PROBABLE CAUSE CORRECTION
Condensing unit runs,
but short cycles on:
1.OVERLOAD PROTECTOR.
2.THERMOSTAT.
3.HIGH PRESSURE CUT-OUT DUE TO:
(a) INSUFFICIENT AIR SUPPLY.
(B) OVERCHARGE.
(c) AIR IN SYSTEM.
4.LOW PRESSURE CUT-OUT DUE TO:
(a) VALVE LEAK.
(b) UNDERCHARGE.
(c) RESTRICTION IN EXPANSION DEVICE.
1.SEE PROBLEM # 3.
2.DIFFERENTIAL MUST BE WIDENED.
3.
(a) CHECK AIR SUPPLY TO CONDENSER.
(b) EVACUATE AND RE-CHARGE.
(c) EVACUATE AND RE-CHARGE.
4.
(a) REPLACE, EVACUATE AND RE-
CHARGE.
(b) EVACUATE AND RE-CHARGE.
(c) REPLACE EXPANSION DEVICE.
Condensing unit runs,
but for prolonged
periods or continuous.
1.SHORTAGE OF REFRIGERANT.
2.CONTROL CONTACTS STUCK CLOSED.
3.EXCESSIVE HEAT LOAD PLACED INTO
CABINET.
4.PROLONGED OR TOO FREQUENT DOOR
OPENINGS.
5.EVAPORATOR COIL ICED.
6.RESTRICTION IN REFRIGERATION SYSTEM.
7.DIRTY CONDENSER.
8.FILTER DRIER CLOGGED.
1.FIX LEAK,EVACUATE AND RE-CHARGE.
2.CLEAN CONTACTS OR REPLACE
CONTROL.
3.ALLOW UNIT SUFFICIENT TIME FOR
REMOVAL OF LATENT HEAT.
4.PLAN OR ORGANIZE SCHEDULE TO
CORRECT
CONDITION.
5.DEFROST EVAPORATOR COIL.
6.DETERMINE LOCATION AND REMOVE.
7.CLEAN CONDENSER COIL.
8.REPLACE,EVACUATE AND RE-CHARGE.
Start capacitor open,
shorted or blown.
1.RELAY CONTACT NOT OPENING PROPERLY.
2.PROLONGED OPERATION ON START CYCLE:
(a) LOW VOLTAGE TO UNIT.
(b) IMPROPER RELAY.
(c) STARTING LOAD TOO HIGH.
3.EXCESSIVE SHORT CYCLING.
4.IMPROPER CAPACITOR.
1.CLEAN CONTACTS OR REPLACE RELAY.
2.
(a) DETERMINE REASON AND CORRECT.
(b) REPLACE WITH CORRECT RELAY.
(c) CORRECT BY USING PUMP DOWN.
3.DETERMINE REASON FOR SHORT
CYCLE, (SEE PROBLEM #5) AND
CORRECT.
4.DETERMINE CORRECT SIZE AND
REPLACE.
Run capacitor open,
shorted or blown.
1.IMPROPER CAPACITOR.
2.EXCESSIVELY HIGH LINE VOLTAGE, OVER
110% OF RATED MAXIMUM.
1.CHECK SIZE AND REPLACE.
2.DETERMINE REASON AND CORRECT.
Relay defective or
blown out.
1.INCORRECT RELAY.
2.INCORRECT MOUNTING ANGLE.
3.VOLTAGE TOO LOW OR TOO HIGH.
4.EXCESSIVE SHORT CYCLING.
5.LOOSE OR VIBRATING MOUNTING POSITION
6.INCORRECT RUN CAPACITOR.
7.LOOSE WIRING ON RELAY OR OVERLOAD.
1.CHECK RELAY AND REPLACE.
2.REMOUNT RELAY IN CORRECT
POSITION.
3.DETERMINE REASON AND CORRECT.
4.DETERMINE REASON AND CORRECT
(SEE PROBLEM # 5).
5.REMOUNT RIGIDLY.
6.REPLACE WITH PROPER CAPACITOR.
7.TIGHTEN ALL WIRING SCREWS.