Trane RTAA-100, Installation & Maintenance Manual

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128 RTAA-SVX01A-EN
Diagnostics
Contactor CPRSR A MMR a. Welded cprsr contactor.
b. Detected a welded compressor contactor when the
compressor was commanded off but the current does
not go to zero. Detection time shall be 5 second
minimum and 10 seconds maximum. On detection,
generate the diagnostic, energize the appropriate alarm
relay, continue to command the affected compressor off,
energize the affected compressors oil line solenoid, stop
all other compressors, unload the running compressor
with the welded contactor, open the EXV to its
maximum open position, and continue to do fan control.
Do not exit this condition until the controller is manually
reset.
Contactor CPRSR B MMR Same as CPRSR A.
Contactor CPRSR C MMR Same as CPRSR A.
Contactor CPRSR D MMR Same as CPRSR A.
CPRSR Suct Temp Sensor - Ckt 1 CMR Open or short.
CPRSR Suct Temp Sensor - Ckt 2 CMR Open or short.
CWS/Leaving Water Temp Cutout
Setpoint Overlap None No diagnostic, display to flash and 1imit value to last legal
value.
NOTE: The above is not a diagnostic because you
don't want the display vectoring you to a different
display state when you are trying to set either the
chilled water setpoint or the leaving water temp.
cutout setpoint as it will in the case of a diagnostic.
Discharge Temp - Cprsr A CMR a. The discharge temp. exceeded the trip value;
135 + or -3 C.
b. The discharge temp. PTC or wiring is open.
c. Time to trip from either trip value exceeded or input
open shall be 0.5 to 2.0 seconds.
Discharge Temp - Cprsr B CMR Same as Diagnostic for Cprsr A, above.
Discharge Temp - Cprsr C CMR Same as Diagnostic for Cprsr A, above.
Discharge Temp - Cprsr D CMR Same as Diagnostic for Cprsr A, above.
Emergency Stop MMR EMERGENCY STOP input is open. An external interlock has
tripped. Time to trip from input opening to unit stop shall be
0.1 to 1.0 seconds.
Entering Oil Temp Sensor - Cprsr A CMR Open or short.
Entering Oil Temp Sensor - Cprsr B CMR Open or short.
Entering Oil Temp Sensor - Cprsr C CMR Open or short.
Entering Oil Temp Sensor - Cprsr D CMR Open or short.
Evap Entering Wtr Temp Sensor MMR Open or short.
Evap Leaving Wtr Temp Sensor MMR Open or short.
Evap Rfgt Temp Sensor - CKT 1 CMR Open or short (for 30 sec).
Evap Rfgt Temp Sensor - CKT 2 CMR Open or short (for 30 sec).
Table 19 Diagnostic Codes
Diagnostic Description Type Cause