QUANTUM™ HD COMPRESSOR CONTROL PANEL
MAINTENANCE
090.040-M (MAR 12)
Page 59
SYMPTOM PROBABLE CAUSES and CORRECTIONS
OIL HEATERS DO NOT OPERATE
The oil heaters should operate only when the compressor is NOT running and the oil
separator temperature is not greater than or equal to the Oil Heater Off Above set-
point, and that the Oil Level input is made.
If the oil heaters do not work and the LED (D21) for Output 21 (MOD 21) is on, check
for the proper panel voltage between position 4 and 1 on the P6 DIO connector on
Digital I/O board #1. If the proper voltage is not found, check the fuse (F21) and if the
fuse is OK, check the output module (MOD 21). If the voltage was OK, check for the
proper voltage between position 1 on the P6 DIO connector and position 9 on the
terminal strip. If voltage is OK, check for the proper voltage between position 9 and 2
on the terminal strip. If the voltage is OK, check the Oil Heater Relay (1CR).
If the problem hasn’t been located, check the circuit breaker (1CB). If the breaker is not
tripped, check power into 1CB. If OK check between Wires 103 and 106. If the Oil Heater
Relay (1CR) is closed, check for proper panel voltage between wires 106 and 102. If OK,
check the Oil Heater.
COMPRESSOR DOES NOT LOAD
and/or UNLOAD* (Compressor
that steps on Capacity)
For a 4-Step compressor, verify that the 50% SV (Solenoid Valve) is energized
BEFORE the 75% SV is energized. For a 3-Step compressor, verify that 75% SV is en-
ergized BEFORE the 100% SV. Feel hydraulic tubing to the compressor unloading pis-
tons. If tubing is hot, inspect the unloader pistons for worn parts or improper seating.
Check that the hydraulic valves feeding the solenoid valve as well as those feeding the
unloader pistons are open.
Confi rm that hydraulic tubing and wiring is properly connected.
Check the solenoid valve coil to see if it has been damaged.
NOTE: Verify that the proper capacity control setpoint has been programmed.
COMPRESSOR WILL ONLY PAR-
TIALLY LOAD* (Compressor that
steps on Capacity)
With the fi rst SV (solenoid valve) properly energized, verify that the second SV ener-
gizes and then check the third SV if there is one for this compressor model.
Check that the hydraulic valves feeding the fi rst SV as well as those feeding the com-
pressor unloading pistons are open.
Inspect the compressor unloading ports for worn or improperly seated parts.
SLIDE VALVE DOES NOT LOAD
and/or UNLOAD*
Verify that the Slide Valve is in the AUTO mode and that capacity control is calling for
load and/or unload. Output 5 (MOD 5) controls the Slide Valve Load Solenoid. If LED
(D5) for Output 5 (MOD 5) is on, check for the proper panel voltage between position
4 and 1 on the P2 DIO connector on Digital I/O board #1. If the proper voltage is not
found, check the fuse (F5) and if the fuse is OK, check the output module (MOD 5). If
the voltage was OK, check for the proper voltage between position 1 on the P2 DI O
connector and position 17 on the terminal strip. If voltage is OK, check for the proper
voltage between position 17 and 2 on the terminal strip. If the voltage is OK, check the
solenoid valve.
Output 6 (MOD 6) controls the Slide Valve Unload Solenoid. If the LED (D1) for Output
6 (MOD 6) is on, check for the proper panel voltage between position 4 and 2 on the
P2 DIO connector on Digital I/O board #1. If the proper voltage is not found, check the
fuse (F6) and if the fuse is OK, check the output module (MOD 6). If the voltage was OK,
check for the proper voltage between position 2 on the P2 DIO connector and position
16 on the terminal strip. If voltage is OK, check for the proper voltage between position
16 and 2 on the terminal strip. If the voltage is OK, check the solenoid valve.
NOTE: Verify that the proper capacity control setpoint has been programmed.
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