PROBLEM
PROBABLE CAUSE
CORRECTION
| Condensing unit runs, | 1.OVERLOAD PROTECTOR. | 1.SEE PROBLEM # 3. |
| |
| but short cycles on: | 2.THERMOSTAT. | 2.DIFFERENTIAL MUST BE WIDENED. | ||
|
| 3.HIGH PRESSURE | 3. |
|
|
|
| (a) INSUFFICIENT AIR SUPPLY. | (a) CHECK AIR SUPPLY TO CONDENSER. | ||
|
| (B) OVERCHARGE. | (b) EVACUATE AND | ||
|
| (c) AIR IN SYSTEM. | (c) EVACUATE AND | ||
|
| 4.LOW PRESSURE | 4. |
|
|
|
| (a) VALVE LEAK. | (a) REPLACE, EVACUATE AND RE- | ||
|
|
| CHARGE. |
|
|
|
| (b) UNDERCHARGE. | (b) EVACUATE AND | ||
|
| (c) RESTRICTION IN EXPANSION DEVICE. | (c) REPLACE EXPANSION DEVICE. | ||
|
|
|
| ||
| Condensing unit runs, | 1.SHORTAGE OF REFRIGERANT. | 1.FIX LEAK,EVACUATE AND | ||
| but for prolonged | 2.CONTROL CONTACTS STUCK CLOSED. | 2.CLEAN CONTACTS OR REPLACE | ||
| periods or continuous. | 3.EXCESSIVE HEAT LOAD PLACED INTO | CONTROL. |
|
|
|
| 3.ALLOW UNIT SUFFICIENT TIME FOR | |||
|
| CABINET. | REMOVAL OF LATENT HEAT. |
| |
|
| 4.PROLONGED OR TOO FREQUENT DOOR | 4.PLAN OR ORGANIZE SCHEDULE TO | ||
|
| OPENINGS. | CORRECT CONDITION. |
| |
|
| 5.EVAPORATOR COIL ICED. | 5.DEFROST EVAPORATOR COIL. |
| |
|
| 6.RESTRICTION IN REFRIGERATION SYSTEM. | 6.DETERMINE LOCATION AND REMOVE. | ||
|
| 7.DIRTY CONDENSER. | 7.CLEAN CONDENSER COIL. |
| |
|
| 8.FILTER DRIER CLOGGED. | 8.REPLACE,EVACUATE AND | ||
|
|
|
| ||
| Start capacitor open, | 1.RELAY CONTACT NOT OPENING PROPERLY. | 1.CLEAN CONTACTS OR REPLACE RELAY. | ||
| shorted or blown. | 2.PROLONGED OPERATION ON START CYCLE: | 2. |
|
|
|
| (a) LOW VOLTAGE TO UNIT. | (a) DETERMINE REASON AND CORRECT. | ||
|
| (b) IMPROPER RELAY. | (b) REPLACE WITH CORRECT RELAY. | ||
|
| (c) STARTING LOAD TOO HIGH. | (c) CORRECT BY USING PUMP DOWN. | ||
|
| 3.EXCESSIVE SHORT CYCLING. | 3.DETERMINE REASON FOR | SHORT | |
|
|
| CYCLE, | (SEE PROBLEM | #5) AND |
|
| 4.IMPROPER CAPACITOR. | CORRECT. |
|
|
|
| 4.DETERMINE CORRECT SIZE AND | |||
|
|
| REPLACE. |
|
|
| Run capacitor open, | 1.IMPROPER CAPACITOR. | 1.CHECK SIZE AND REPLACE. |
| |
| shorted or blown. | 2.EXCESSIVELY HIGH LINE VOLTAGE, OVER | 2.DETERMINE REASON AND CORRECT. | ||
|
| 110% OF RATED MAXIMUM. |
|
|
|
|
|
|
|
| |
| Relay defective or | 1.INCORRECT RELAY. | 1.CHECK RELAY AND REPLACE. |
| |
| blown out. | 2.INCORRECT MOUNTING ANGLE. | 2.REMOUNT RELAY IN CORRECT | ||
|
|
| POSITION. |
|
|
|
| 3.VOLTAGE TOO LOW OR TOO HIGH. | 3.DETERMINE REASON AND CORRECT. | ||
|
| 4.EXCESSIVE SHORT CYCLING. | 4.DETERMINE REASON AND CORRECT | ||
|
|
| (SEE PROBLEM # 5). |
| |
|
| 5.LOOSE OR VIBRATING MOUNTING POSITION | 5.REMOUNT RIGIDLY. |
| |
|
| 6.INCORRECT RUN CAPACITOR. | 6.REPLACE WITH PROPER CAPACITOR. | ||
|
| 7.LOOSE WIRING ON RELAY OR OVERLOAD. | 7.TIGHTEN ALL WIRING SCREWS. |
- 24 -