FTS LYOSTAR 3, Operator'S Manual

Page: 76 / 82

Appendix B: Troubleshooting FTS Systems LyoStar™ 3
66 Rev 006, 01/14
© SP Scientific 2014
Condition Possible Cause Recommended Corrective Action
Compressor does not start.
No power to compressor.
Verify that power is connected and
refrigeration switch is on.
Check for power on compressor wires in
electrical panel (See schematic drawing).
Compressor pulling excessive
amperage LRA (Locked Rotor Amps).
Replace Compressor.
Condenser temperature OK,
shelf/product chamber temperature
will not decrease.
Shelf/product chamber solenoid not
opening. Check voltage to coil – replace coil if
necessary.
Low heat transfer fluid.
Check heat transfer level at service
panel. The fluid should fill ½ to ¾ sight
glass at room temperature. Add fluid if
necessary.
No or low nitrogen pressure in heat
transfer system. Nitrogen pressure should be 20 psig at
nitrogen charge access valve.
Heat transfer fluid not circulating. No nitrogen pressure (see above).
Heat transfer pump not turning.
Check voltage to pump motor. Replace
pump if necessary.
Possible refrigeration system leak.
Find leak, repair, evacuate and recharge
to specifications.
Shelf/product chamber temperature
OK, condenser temperature will not
decrease.
Condenser solenoid not opening.
Check voltage to coil. Replace coil if
necessary.
Condenser expansion valve improperly
adjusted (if equipped).
Readjust valve so the compressed
suction service valve has frost on it, but
not on the body of the compressor. This
should be tested at the specified
temperature.
Possible refrigeration system leak.
Find leak, repair, evacuate and recharge
to specifications.
Shelf/product chamber temperature
will not reach specified low
temperature.
Shelf expansion valve improperly
adjusted (if equipped).
Readjust valve so the compressed
suction service valve has frost on it, but
not on the body of the compressor. This
should be tested at the specified
temperature.
Low refrigerant.
Check static charge, find leak, repair,
evacuate and recharge to specifications.