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System Testing & Troubleshooting
DIAGNOSTIC DISPLAYED REASON FOR DIAGNOSTIC UCM’S REACTION RESET REQUIRED
Evap Solution Flow Proving Switch
Problem: Solution Flow Switch is
open after the Solution Pump is ON.
Check: Verify Solution Pump
operation and that the Evaporator
Solution Flow Switch is working
properly.
The diagnostic can occur at any time
after the Evaporator Solution Pump
Relay has been requested ON, and the
Solution Flow Switch input is detected
OPEN (no flow) for 5 continuous
minutes.
When the Solution Flow Switch
input is detected OPEN
(no flow) for 6 continuous
seconds, the Unit will de-
energize
the following relays:
Compressor Relays, LPC
Bypass Relays, Liquid Line
Solenoids, and HGBP Relay.
(PAR) An automatic reset
occurs after the Evap
Solution Flow Proving
Switch has detected
Solution flow for 6
continuous seconds.
External Leaving Solution STP Input
Fail
Problem: CGM is receiving an
External Leaving Solution Setpoint
(LSS) Input signal which is out of
range. Check field/unit wiring
between CGM and External
Leaving Solution Setpoint
potentiometer.
The External Leaving Solution Setpoint
(LSS) is designated as the Leaving
Solution Setpoint source and it is out of
range. Out of range is defined as one of
the following:
a) External LSS > 65 deg F or < 51 deg
F for unit with LSS Range 51-65 deg F.
b) External LSS > 50 deg F or < 40 deg
F for unit with LSS Range 40-50 deg F.
c) External LSS > 39 deg F or < 30 deg
F for unit with LSS Range 30-39 deg F.
d) External LSS > 29 deg F or < 20 deg
F for unit with LSS Range 20-29 deg F.
e) External LSS > 75 deg F or < 10 deg
F for unit with LSS Range SPECIAL.
While the diagnostic is active,
the Leaving Solution Setpoint
will revert to using the default
(HI) Leaving Solution Setpoint.
(PAR) An automatic reset occurs
after the External Leaving Solution
Setpoint returns to its allowable
range. In order to prevent rapid
cycling of the Diagnostic, there is a
10 second delay before the
automatic reset.
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