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pressure
3. Stop valve is yet closed.
High suction
1. Excessive chilled product.
pressure
2. Expansion valve overfeeding.
Low suction
1. Lack of refrigerant.
pressure
2. Evaporator is full of ice
3. Clogged liquid line.
4. Expansion valve malfunctioning.
5. Improper TXV.
Compressor
1. Leaking of refrigerant.
loses oil
2. Loosened cylinder ring
3. Refrigerant flood back.
4. Pipe sizing or trapping is not correct
Compressor
1. Operating beyond design conditions.
thermal
2. Condenser fins are overly dirty
protector switch
3. Overcharged refrigerant
is open.
Evaporator Trouble shooting
Symptoms
Fan(s) is not turned.
Room temperature is too
high.
OASMs-616-C-19-07-05/13/1/07
Possible Causes
1. Main switch is open.
2. Fuses are blown.
3. Motor is out of order.
4. Defective Timer or defrost
thermostat.
5. Unit is in defrosts cycle.
6. Coil is not cooled down
enough to reset thermostat.
1. Room temp. is overly set.
2. Superheat is too high.
3. Refrigerant is shortage.
4. Evap. Coil is highly ice
accumulation.
KOLDTECH
The Technology of Excellence
3. Open stop valve properly.
1. Chilled volume to specification
2. Check remote bulb. Regulate superheat.
1. Check leaking and fix.
2. Defrost system does not work.
3. Replace Stainer-Drier
4. Check and reset for proper superheat.
5. Check for proper sizing.
1. Check leaking and recharge refrigerant.
2. Replace compressor.
3. Maintain proper superheat at
compressor.
4. Re-correct piping.
1. Tuning facilities to the allowable limits.
2. Clean Fin coil.
3. Release the excessive
Actions
1. Close switch.
2. Replace fuses. Check cause of short
circuits or overload conditions.
3. Replace motor.
4. Replace defective component.
5. Wait until resuming
6. Adjust fan delay setting or wait until
resuming.
1. Properly tune thermostat.
2. Adjust thermal expansion valve.
3. Check, fix leaking, and Recharge ref.
4. Do Manually defrost and check
defrost control setting
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