Trane RTAA-100, Installation & Maintenance Manual

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RTAA-SVX01A-EN 129
Diagnostics
External Chilled Water Setpoint IFW a. Not “Enabled”: no diagnostics.
b. “Enabled”: Out-Of-Range Low, set diagnostic.
Out-Of-Range Hi, no diagnostic.
External Current Limit Setpoint IFW a. Not “Enabled”: no diagnostics.
b. “Enabled”: Out-Of -Range Low, set diagnostic.
Out-Of -Range Hi, no diagnostic.
EXV Elec. Drive CKT - Rfgt Ckt 1 CMR Run the EXV electrical drive circuit test both on demand from
the human interface and just before either a circuit or one of a
pair of circuits starts.
EXV Elec. Drive CKT - Rfgt Ckt 2 CMR Same as Diagnostic for Ckt 1, above.
High Diff. Press. - Ckt 1 CMR The difference between the Condenser pressure and the
evaporator pressure exceeded 350 PSID for 0.8-5.0 seconds.
320 PSID must hold, 320 + to trip in One Hour.
High Diff. Press - Ckt 2 CMR Same as Diagnostic for Ckt 1, above.
High Oil Temp - Cprsr A CMR Entering Oil Temp to given compressor exceeded 170F. Time to
trip is given by equation: trip time = (190-0il Temp) x 180 sec/F.
High Oil Temp - Cprsr B CMR Same as Cprsr A, above.
High Oil Temp - Cprsr C CMR Same as Cprsr A, above.
High Oil Temp - Cprsr D CMR Same as Cprsr A, above.
High Pressure Cutout - Cprsr A CMR A high pressure cutout was detected on Cprsr A; trip at 405 +
or -7 PSIG.
High Pressure Cutout - Cprsr B CMR A high pressure cutout was detected on Cprsr B; trip at 405 +
or -7 PSIG.
High Pressure Cutout - Cprsr C CMR A high pressure cutout was detected on Cprsr C; trip at 405 +
or -7 PSIG.
High Pressure Cutout - Cprsr D CMR A high pressure cutout was detected on Cprsr 0; trip at 405 +
or -7 PSIG.
Loss of Local Display Panel COM IFW The 1U1 has detected a loss of IPC communication with the
Local Display panel for at least 15 seconds.
Low Chilled Water Temp (Unit off) IFW The chilled water temp. fell below the cutout setpoint while the
compressors were not running.
Low Chilled Water Temp (Unit on) MAR The chilled water temp. fell below the cutout setpoint while the
compressors were running for 30 degree F Seconds.
Low Differential Press - Ckt 1 CMR The fan control algorithm detected a low differential Temper-
ature/Pressure condition that existed for more than 180
contiguous seconds. Trip point is 40 PSID.
Low Differential Press - Ckt 2 CMR Same as Diagnostic for Ckt 1, above.
Low Evap Rfgt Temp - Ckt 1 CMR a. The Saturated Evap Rfgt Temp - Circuit 1 dropped below
the Low Rfgt Temp Cutout Setpoint while the circuit was
running for 30 deg F seconds.
b. See the low ambient ignore time on startup.
Low Evap Rfgt Temp - Ckt 2 CMR Same as Diagnostic for Ckt 1, above.
Table 19 Diagnostic Codes
Diagnostic Description Type Cause