Trane R Series, Installation Operation & Maintenance

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150 RLC-SVX07A-EN
Diagnostics
Oil System Fault - Ckt 1 CMR Entering Oil Temp on either compressor of the given circuit
reads a temperature x degrees below the given ckts' saturated
condenser temperature for more than 30 minutes where x is
the Oil Loss Differential Setpoint (2 degree F hysterisis to
clear timer).
Oil System Fault - Ckt 2 CMR Same as for Ckt 1, above.
Outdoor Air Temp Sensor (Both Outdoor Air
Reset and Low Ambient Lockout not selected) None Open or short.
a. Display dashes e.g. “14----”.
Outdoor Air Temp Sensor (Either Outdoor Air
Reset or Low Ambient Lockout selected.) I FW Open or short.
a. Use end of range value (whatever value the open or
short.
b. Clear diag. when the resistance returns to normal range.
Over Voltage MAR Line voltage above + 10% of nominal. (Must hold = + 10% of
nominal. Must trip = + 15% of nominal. Reset differential =
min. of 2% and max. of 4%. Time to trip = minimum of 10 sec.
and maximum of 20 seconds.)
Design: Nom. trip: 15 seconds at greater than 113.5%,
± 2.8% at 200V, or ± 1.8% at 575V, Auto reset at 110.5% or
less.
Overload Trip - CPRSR A CMR Cprsr current exceeded overload time vs. trip characteristic.
Overload Trip - CPRSR B CMR Same as Diagnostic for Cprsr A.
Overload Trip - CPRSR C CMR Same as Diagnostic for Cprsr A.
Overload Trip - CPRSR D CMR Same as Diagnostic for Cprsr A.
Phase Loss - Cprsr A CMR No current was sensed on one or more of the current x former
inputs. (Must hold = 20% RLA. Must trip = 5% RLA.) Time to
trip shall be 1 second minimum, 3 seconds maximum.
Phase Loss - Cprsr B CMR Same as Diagnostic for Cprsr A, above.
Phase Loss - Cprsr C CMR Same as Diagnostic for Cprsr A, above.
Phase Loss - Cprsr D CMR Same as Diagnostic for Cprsr A, above.
Phase Reversal - Cprsr A CMR A phase reversal was detected on the incoming current. On a
compressor startup the phase reversal logic must detect and
trip in a maximum of 1.0 second from compressor start.
Phase Reversal - Cprsr B CMR Same as Diagnostic for Cprsr A, above.
Phase Reversal - Cprsr C CMR Same as Diagnostic for Cprsr A, above.
Phase Reversal - Cprsr D CMR Same as Diagnostic for Cprsr A, above.
Phase Rev Prot Lost Cprsr A CMR The phase reversal protection on compressor A has become
inoperative. The phase rotation protection system failed to
detect 2 in a row of one of the four phase circuit states: Phase
reversal, Phase rotation OK, Phase A lost., Phase B lost.
Phase Rev Prot Lost - Cprsr B CMR Same as Cprsr A, above, but Cprsr B.
Phase Rev Prot Lost - Cprsr C CMR Same as Cprsr A, above, but Cprsr C.
Phase Rev Prot Lost - Cprsr D CMR Same as Cprsr A, above, but Cprsr D.
Phase Unbalance - Cprsr A CMR A 15% phase unbalance condition has been detected.
Phase Unbalance - Cprsr B CMR Same as Diagnostic for Cprsr A.
Phase Unbalance - Cprsr C CMR Same as Diagnostic for Cprsr A.
Table 28 Diagnostic Codes
Diagnostic Description Type Cause