S90-010 M FRICK
QUANTUM™ COMPRESSOR CONTROL PANEL
Page 38 MAINTENANCE
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” 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.
Confirm 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 first 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 first 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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