QUANTUM
™
HD COMPRESSOR CONTROL PANEL
MAINTENANCE
090.040-M (NOV 2016)
Page 61
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 sepa-
rator temperature is not greater than or equal to the Oil Heater Off Above setpoint, 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 energized BEFORE
the 100% SV. Feel hydraulic tubing to the compressor unloading pistons. 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.
Conrm 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
PARTIALLY LOAD* (Compressor
that steps on Capacity)
With the rst SV (solenoid valve) properly energized, verify that the second SV energizes
and then check the third SV if there is one for this compressor model.
Check that the hydraulic valves feeding the rst SV as well as those feeding the compressor
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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