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Appendix F: Troubleshooting • F-3
Compressor will not Operate Compressor is not programmed
properly.
Verify that E2 was programmed
for correct number of compres-
sor stages. Highlight the General
tab (C1) in the Suction Group
Setup screen. Is the correct num-
ber of stages in the “Number of
Stages” field?
Compressor types are set up
incorrectly.
Make sure that compressor
stages were properly set up as
VS (variable speed), C (com-
pressor), or U (unloader).
Compressor programmed with
incorrect rating.
Verify that compressors were
assigned the proper rating (HP/
AMP, or BTU).
Pressure setpoints are set up
incorrectly.
Set proper pressure setpoints.
If you are controlling the rack
using suction pressure, enter the
pressure setpoint in the SUC
PRES SETPT field. If you are
controlling by temperature, enter
the temperature setpoint in the
CTRL TEMP SETPT field.
Note: Pressure setpoints are
located under the Setpoints tab
(C2) in the Suction Group Setup
screen.
Board and point addresses are
incorrect.
Set proper board and point set-
tings for input, output, and com-
pressor outputs. Board and point
settings are located under the
Inputs tab (C4), Outputs tab
(C5), and Comp Outs tab (C7) in
the Suction Group Setup screen.
SYMPTOM POSSIBLE PROBLEM SOLUTION