OMM TGZ-1 TGZ 040A through TGZ 190A 81
Troubleshooting Chart, Continued
Little or No Oil
Pressure
1. Clogged suction oil strainer.
2. Excessive liquid in crankcase.
3. Oil pressure gauge defective.
4. Low oil pressure safety switch
defective
5. Worn oil pump.
6. Oil pump reversing gear stuck in
wrong position.
7. Low oil level.
8. Loose fitting on oil lines.
9. Pump housing gasket leaks.
10. Flooding of refrigerant into
crankcase.
1. Clean.
2. Check crankcase heater. Reset
expansion valve for higher
superheat. Check liquid line
solenoid valve operation.
3. Repair or replace. Keep valve
closed except when taking reading.
4. Replace
5. Replace
6. Reverse direction of compressor
rotation by switching compressor
leads.
7. Add oil.
8. Check and tighten system.
9. Replace gasket.
10. Adjust thermal expansion valve.
Motor Overload
Relays or
Circuit Breakers
Open
1. Low voltage during high load
conditions.
2. Defective or grounded wiring in
motor or power circuits.
3. Loose power wiring.
4. High condensing temperature.
5. Power line fault causing unbalanced
voltage.
6. High ambient temperature around
the overload relay.
7. Failure of second starter to pull in on
part winding start system.
1. Check supply voltage for excessive
line drop.
2. Replace compressor motor.
3. Check all connections and tighten.
4. See corrective steps for high
discharge pressure.
5. Check Supply voltage. Notify power
company. Do not start until fault is
corrected.
6. Provide ventilation to reduce heat.
7. Repair or replace starter or time
delay mechanism.
Compressor
Thermal Switch
Open
1. Operating beyond design conditions.
2. Discharge valve partially shut.
3. Blown valve plate gasket.
1. Add facilities so that conditions are
within allowable limits.
2. Open valve.
3. Replace gasket.
Freeze
Protection
Opens
1. Thermostat set too low.
2. Low water flow.
3. Low suction pressure.
1. Reset to 42°F (6°C) or above.
2. Adjust flow.
3. See “Low Suction Pressure.”
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