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System Testing & Troubleshooting
DIAGNOSTIC DISPLAYED REASON FOR DIAGNOSTIC UCM’S REACTION RESET REQUIRED
Evaporator Solution Flow Loss
The switch connected to the flow
proving switch input on a unit with a
Brazed Plate heat exchanger has
failed CLOSED;
or
during power-up, a unit with a
Brazed Plate heat exchanger has
detected that older versions of
control modules are installed.
Units with a Brazed Plate heat
exchanger require a flow proving switch
for freeze protection functionality. This
flow proving switch input was detected
closed (shorted) at the time the solution
pump was commanded ON (Only on
units with "Chiller Solution Pump Mode"
set to AUTO).
Also, units with Brazed Plate heat
exchanger require newer versions of
control boards for proper operation.
During power-up, the unit detected at
least one replacement module with a
Software Verison number less than what
is required.
A "Lockout all Circuit" request
is issued to the compressor
staging function. Compressor
Relays, LPC Bypass Relays,
Liquid Line Solenoid Relays
and HGBP relay are all de-
energized.
(PMR) A manual reset is required
after this diagnostic occurs. The
Diagnostic can be reset by the unit
mounted Human Interface Module
or Tracer, or by cycling power to the
CGM.
For Service Parts Replacement,
please note:
(a) For proper operation of units with
Brazed Plate heat exchangers,
please insure the following board is
installed:
Multiple Compressor Module (MCM)
- Software Version number greater
than or equal to 10.00
or
Single Compressor Module
(SCM) - Software Version number
greater than or equal to 10.00
(b) To eliminate this diagnostic
when it is due to an incompatible
Software Version number(s), please
install the appropriate board(s) per
the following:
Cold Generator Module (CGM) -
Software Version number greater
than or equal to 3.00
CG Unit Human Interface (HI) -
Software Version number greater
than or equal to 27.00
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