Hussmann Ingersoll Rand User Manual page 250

Observation
14. Motor burnout
15. On parallel
compressor
installations, oil
level does not
equalize or remain
at a constant level in
all compressors
16. Compressor
running hot
Installation and Start-up
Possible Cause
Check control box for
welded starter contacts,
welded overload contacts,
or burned out heater
elements.
Oil equalization line not
preventing gas equalization
Excessive blow by into
crankcase – worn rings,
valves, or blown gasket.
Blown valve plate or
cylinder head gasket
Broken suction or discharge
valve
Compression ratio too high
High suction temperature
Cylinder head cooling fan
not operating or incorrect
voltage to fan motor
High oil level
Excessive blow-by into
crankcase – worn rings,
valves, or blown gasket.
16
Remedy
Replace defective components.
Level oil equalization line
Replace gasket, valve plate, or
compressor.
See no. 3.
Replace valves and valve plate, if
necessary.
a. Check setting of low and high
pressure switches
b. Check condenser – is it
plugged
c. Check that all evaporator and
condenser fans are operating
properly.
Reduce suction temperature by TXV
adjustment or provide desuperheating
Replace defective part or check that
available voltage agrees with fan
motor voltage.
Lower oil level
Replace gasket, valve plate, or
compressor.