6M.1: Trouble Shooting Chart; Troubleshooting - Quantum 67ACW2-134 Owner's Manual

Owners Manual

6m.1: Trouble Shooting Chart

PROBLEM
1. Main switch open
2. Fuse blown, breakers open
3. Thermal overloads tripped
COMPRESSOR 4. Defective contactor or coil
WILL NOT RUN
5. System off by protection device
6. No heating required
7. Liquid line solenoid will not open
8. Motor electrical problem
9. Loose wiring, faulty controller sensor
10. Compressor failure
1. Refrigerant flooding compressor
COMPRESSOR
2. Refrigerant overcharged
NOISY OR
3. Improper line support
VIBRATING
4. Worn compressor
1. Lack of refrigerant
2. Restricted air or cold air re-circulated
3. Expansion valve not opened
EVAPORATOR COIL 4. Expansion valve power element
ICING UP
5. De-ice interval too long for that
6. Too much cold water to be heated
1. Compressor loses oil owing to
2. Compressor loses oil owing to
3. System contaminated, and/or Liquid
COMPRESSOR
THERMAL SWITCH
4. Suction superheat too high
OPEN
5. Oil degrades owing to high
6. De-icing could not de-ice completely.
7. Crankcase heater burned out
1. Non condensibles in system
2. Refrigerant overcharged
HIGH
3. Water temp cut-out setting too high
DISCHARGE
4. Condenser water tube scaled
PRESSURE
5. Blocked condenser
6. Higher suction pressure than normal
1. Lack of refrigerant
2. Evaporator dirty
3. Clogged filter drier (pipe after the
LOW SUCTION
PRESSURE
4. Expansion valve malfunctioning
5. De-icing could not de-ice completely
UNSTABLE 1. Expansive valve hunting
SUCTION 2. Ice-blocking in the expansion valve
PRESSURE
UNSTABLE 1. Non condensibles in system
DISCHARGE 2. Refrigerant overcharged
PRESSURE
COMPRESSOR 1. Erratic water thermostat
INTERVAL TOO 2. Insufficient water flow
SHORT
1. Low voltage during high loads
MOTOR 2. Defective or grounded motor wiring
OVERLOAD 3. Loose power wiring
RELAYS OPEN 4. High evaporating temperature
OR BLOWN 5. Liquid refrigerant flood back
FUSES 6. Unbalanced voltage
Document Number : QDC0049PD-5
POSSIBLE CAUSES
/ broken wire
sufficiently
leaks
particular site
refrigerant flooding back
refrigerant leaks
injection capillary tube blocked
temperature
filter cold)
(leakage phial/bulb)
(ice up in the Valve body)
Quantum Energy Technologies
POSSIBLE CORRECTIVE STEPS
1. Close switch
2. Check electrical circuits and motor windings for shorts.
Check for overloads and loose connections. Replace
fuse or reset breaker.
3. Check unit when back on line, auto reset
4. Repair or replace
5. Determine cause and correct
6. None, should start on call for heating
7. Repair or replace coil
8. Check motor for open or short circuit, or burnout
9. Check all wire junctions. Tighten all terminals
10. Replace compressor
1. Check expansion valve setting and superheat
2. Remove excess refrigerant
3. Relocate or add supports
4. Replace compressor
1. Check for leaks. Repair and replace refrigerant.
2. Proper clearance for air flow
3. Check and adjust for proper superheat
4. Replace expansion valve
5. Shorten the de-ice interval
6. Reduce the amount of water or add a head pressure
regulator to the machine
1. Check and fix the flood back problem. Add oil if
necessary
2. Find and repair the leakage. Add oil if necessary
3. Purging the system and change oil and the filter/drier
4. Adjust superheat
5. Find and rectify the high discharge temperature. Change
the oil (to the requirement amount!) purge the system
and change the filter/drier
6. Find and rectify the de-ice problem
7. Replace crankcase heater
1. Remove with authorized procedures
2. Remove excess charge
3. Check the settings
4. Clean the tube
5. Clean condenser
6. Refer to 'High Suction Pressure'
1. Check for leaks. Repair then replace refrigerant.
2. Clean evaporator
3. Replace filter drier
4. Check and change it
5. Check and adjust the de-icing setting if necessary.
1. Check and close the valve for proper superheat
2. Check and change the refrigerant and the drier
1. Remove with authorized procedures
2. Remove excess charge
1. Replace sensor
2. Adjust flow
1. Check supply voltage
2. Replace compressor
3. Check all connections and tighten
4. See steps for high discharge
5. Too much refrigerant. Check the evaporator, the fan and
the TX valve opening.
6. Check voltage. Contact Power Company
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