QUANTUM™ HD COMPRESSOR CONTROL PANEL
MAINTENANCE
090.040-M (MAR 12)
Page 60
SYMPTOM PROBABLE CAUSES and CORRECTIONS
SLIDE STOP DOES NOT IN-
CREASE and/or DECREASE*
Verify that the Slide Stop is in the AUTO mode and that the VI Ratio is calling for a VI
increase or decrease.
Output 7 (MOD 7) controls Slide Stop Increase Solenoid. If the LED (D7) for Output 7
(MOD 7) is on, check for the proper panel voltage between position 4 and 5 on the P2
DIO connector on Digital I/O board #1. If the proper voltage is not found, check the fuse
(F7) and if the fuse is OK, check the output module (MOD 7). If the voltage was OK,
check for the proper voltage between position 5 on the P2 DIO connector and position
15 on the terminal strip. If voltage is OK, check for the proper voltage between position
15 and 2 on the terminal strip. If the voltage is OK, check the solenoid valve.
Output 8 (MOD 8) controls the Slide Stop Decrease Solenoid. If the LED (D8) for Output
8 (MOD 8) is on, check for the proper panel voltage between position 4 and 6 on the
P2 DIO connector on Digital I/O board #1. If the proper voltage is not found, check the
fuse (F8) and if the fuse is OK, check the output module (MOD 8). If the voltage was OK
check for the proper voltage between position 6 on the P2 DIO connector and position
14 on the terminal strip. If voltage is OK, check for the proper voltage between position
14 and 2 on the terminal strip. If the voltage is OK, check the solenoid valve.
LIQUID INJECTION SOLENOID
DOES NOT ENERGIZE* (Liquid
Injection Refrigerant Cutout -
LICO)
Verify that the Liquid Injection TXV is modulating properly and not feeding excessive
liquid to LICO the compressor. This solenoid SHOULD be de-energized when the com-
pressor is off. This solenoid should be energized if the Discharge temperature equals or
exceeds the “Discharge Temperature On At” setpoint for the delay time.
Output 9 controls the Liquid Injection Solenoid. If the LED (D9) for Output 9 (MOD 9) is
on, check for the proper panel voltage between position 4 and 1 on the P3 DIO connec-
tor on Digital I/O board #1. If the proper voltage is not found, check the fuse (F9) and
if the fuse is OK, check the output module (MOD 9). If the voltage was OK, check for
the proper voltage between position 1 on the P3 DIO connector and position 13 on the
terminal strip. If voltage is OK, check for the proper voltage between position 13 and 2
on the terminal strip. If the voltage is OK, check the solenoid.
HI Vi LIQUID INJECTION PORT
SOLENOID DOES NOT ENER-
GIZE*
Output 10 controls the Hi Vi Liquid Injection Port solenoid. If the LED (D10) for Output
10 (MOD 10) is on, check for the proper panel voltage between position 4 and 2 on
the P3 DIO connector on Digital I/O board #1. If the proper voltage is not found, check
the fuse (F10) and if the fuse is OK, check the output module (MOD 10). If the voltage
was OK check for the proper voltage between position 2 on the P3 DIO connector and
position 12 on the terminal strip. If voltage is OK, check for the proper voltage between
position 12 and 2 on the terminal strip. If the voltage is OK, check the solenoid. NOTE:
For an RXB and a GST compressor model, this output should only be on when the Vi
is at 5.0.
ECONOMIZER*
Output 11 (MOD 11) controls the Economizer Solenoid Valve. If the LED (D11) for Out-
put 11 (MOD 11) is on, check for the proper panel voltage between position 4 and 5 on
the P3 DIO connector on Digital I/O board #1. If the proper voltage is not found, check
the fuse (F11) and if the fuse is OK, check the output module (MOD 11). If the voltage
was OK, check for the proper voltage between position 5 on the P3 DIO connector and
position 11 on the terminal strip. If voltage is OK, check for the proper voltage between
position 11 and 2 on the terminal strip. If the voltage is OK, check the solenoid.
NOTE: The economizer output will be on based on the Economizer On/Off setpoint.
ALARM CIRCUIT DOES NOT
ENERGIZE
Output 22 (MOD 22) controls the Alarm Circuit. The Alarm should turn on only when
there is a warning or shutdown. If the Alarm does not occur when these conditions are
found and the LED (D22) for Output 22 (MOD 22) is off, check for the proper panel volt-
age between position 4 and 2 on the P6 DIO connector on Digital I/O board #1. If the
proper voltage is not found, check the fuse (F22) and if the fuse is OK, check the output
module (MOD 22). If the voltage was OK, check for the proper voltage between position
2 on the P6 DIO connector and position 21 on the terminal strip.
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