Maritime Geothermal TF-45, Инструкция по установке и обслуживанию

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1-Jul-2017 Page 49 001223MAN-05
COMPRESSOR TROUBLESHOOTING
Fault Possible Cause Verification Recommended Action
Compressor will
not start
Faulty control board. Measuring from C on the terminal strip,
verify there is voltage at Y, HP1, HP2,
LP1, LP2, and both flow pins but no volt-
age present at CC.
Replace control board.
Faulty run capacitor.
(Single phase only)
Check value with capacitance meter.
Should match label on capacitor. Com-
pressor will hum while trying to start and
then trip its overload.
Replace if faulty.
Loose or faulty wiring. Check all compressor wiring, including
inside compressor electrical box.
Fix any loose connections. Replace
any damaged wires.
Faulty compressor contactor. Voltage on line side with contactor held
closed, but no voltage on one or both
terminals on the load side.
Points pitted or burned.
Or, 24VAC across coil but contactor will
not engage.
Replace contactor.
Thermal overload on
compressor tripped.
Ohmmeter shows reading when placed
across R and S terminals and infinity
between C & R or C & S. A valid re-
sistance reading is present again after
the compressor has cooled down.
Proceed to Operation Troubleshoot-
ing to determine the cause of the
thermal overload trip.
Burned out motor
(open winding)
Remove wires from compressor.
Ohmmeter shows infinite resistance
between any two terminals Note: Be
sure compressor overload has had a
chance to reset. If compressor is hot this
may take several hours.
Replace the compressor.
Burned out motor
(shorted windings)
Remove wires from compressor. Re-
sistance between any two terminals is
below the specified value.
Replace the compressor.
Motor shorted to ground. Remove wires from compressor. Check
for infinite resistance between each ter-
minal and ground.
If any terminal to ground is not infinite
replace the compressor.
Seized compressor due to
locked or damaged
mechanism.
Compressor attempts to start but trips its
internal overload after a few seconds.
(Run capacitor already verified)
Attempt to “rock” compressor free. If
normal operation cannot be
established, replace compressor.
Compressor
starts hard
Start capacitor faulty.
(Single phase only)
Check with capacitance meter.
Check for black residue around blowout
hole on top of capacitor.
Replace if faulty.
Remove black residue in electrical
box if any.
Potential Relay faulty.
(Single phase only)
Replace with new one and verify com-
pressor starts properly.
Replace if faulty.
Compressor is “tight” due to
damaged mechanism
Compressor attempts to start but trips its
internal overload after a few seconds.
Run capacitor has been verified already.
Attempt to “rock” compressor free. If
normal operation cannot be estab-
lished, replace compressor.
Compressor
Stage 2 will not
activate
Faulty Stage 2 module Verify if 24VAC is present across
Y2 and C of the terminal strip.
Replace module if signal is present.
Check wiring if signal is not present.