146 RLC-SVX07A-EN
Diagnostics
In the table below, a latching diagnostic is a condition which shall cause the
machine or a portion of the machine as noted to shut down and shall require a
manual reset to restore operation. A diagnostic that is non-latching shall reset
automatically when the condition causing the diagnostic goes away. A non-
latching diagnostic shall shut down the machine or a part of the machine if so
indicated. If a diagnostic is informative only, no machine or circuit action is
taken except to load a diagnostic code into the last diagnostic register.
Diagnostic Types (And Action)
MMR = Machine Shutdown, Manual Reset
MAR = Machine Shutdown, Auto Reset
CMR = Circuit Shutdown, Manual Reset
CAR = Circuit Shutdown, Auto Reset
IFW = Information Warning
Table 28 Diagnostic Codes
Diagnostic Description Type Cause
Chilled Water Flow (Ent Wtr Temp) MMR
a. The entering evaporator water temp. fell below the
leaving evaporator water temp. by more than 2F for 100
degree F - seconds.
b. Causes to trip this diagnostic include either a loss of
chilled water flow or a calibration shift in the evap. water
temp. sensors.
Chilled Water Flow Interlock MAR The chilled water flow switch input was open for more than 6
seconds.
Compressor Overload Setting Cprsr A IFW The CPM NovRam Based overload setting did not agree with
the MCSP Dip Switch overload setting for 30 contiguous
seconds. The affected MCSP shall use the minimum (00000
binary, 00 decimal) overload setting as a default until the UCM
is reset when this diagnostic occurs.
Compressor Overload Setting - Cprsr B I FW Same as Cprsr A, above.
Compressor Overload Setting - Cprsr C IFW Same as Cprsr A, above.
Compressor Overload Setting - Cprsr D IFW Same as Cprsr A, above.
Cond Fan Var Speed Drive Fault Ckt 1 IFW The controlling MCSP for the given circuit has unsuccessfully
attempted (5 times within 1 minute) to clear a fault signal from
the Condenser Fan Inverter Drive. The 5th attempt removes
power from the inverter to create a power up reset. If the fault
does not clear, the UCM will revert to constant speed
operation without the use of the inverters fan. The inverter
must be manually bypassed for full fixed speed fan operation.
Cond Fan Var Speed Drive Fault Ckt 2 IFW Same as Ckt 1, above.
Cond Entering Wtr Temp Sensor IFW Shorted Cond. temp sensor. No diagnostic on open.
Cond Leaving Wtr Temp Sensor IFW Shorted Cond. temp sensor. No diagnostic on open.
Cond Rfgt Temp Sensor - CKT 1 CMR Open or short.
Cond Rfgt Temp Sensor - CKT 2 CMR Open or short.
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