Trane RTHC Installation Operation & Maintenance page 143

Diagnostic Diagnostic
Description Type
Over Voltage MAR
Phase Loss MMR
Phase Reversal MMR
Phase Reversal MMR
Protection Lost
Phase Seq MMR
Monitor: Phase
Reversal
Rfgt Monitor IFW
Auxiliary Alarm
Rfgt Monitor Aux IFW
Input Error
Rfgt Monitor IFW
Bench Flow Loss
Rfgt Monitor IFW
Calibration Error
Rfgt Monitor IFW
Chopper
Rfgt Monitor IFW
External Reset
Rfgt Monitor Fault IFW
Rfgt Monitor IR IFW
Source
Rfgt Monitor IFW
Level 3 Rfgt
Alarm
Rfgt Monitor IFW
Level 2 Rfgt
Alarm
Installation, Operation and Maintenance
Shutdown
Action
Friendly a. 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 1 min. 10 sec. and
maximum of 5 min. 20 seconds)
Design: Nom. trip: 60 seconds at greater than 112.5%, + or -2.5%,
Auto Reset at 109% or less.
Immediate a. No current was sensed on one or more of the current transformer
inputs. (Must hold = 20% RLA. Must trip = 5% RLA.) Time to trip
shall be 1 second minimum, 3 seconds maximum. Actual design trip
point is 10%. The actual design trip time was 2.64 seconds.
Immediate a. A phase reversal was detected on the incoming current. On a
compressor start-up the phase reversal logic must detect and trip in
a maximum of 0.3 second from compressor start.
Immediate a. The phase reversal protection on the compressor 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.
Immediate At start-up, the Phase Sequence Monitor detected a Voltage-based
phase reversal in the compressor motor terminal box. The
combination of the Phase Sequence Monitor and the Starter Module
shall de-energize the starter within 0.3 seconds from start if a phase
reversal exists. The Phase Sequence monitor presents a Form A
(NO) contact which closes after 3 Phase Line Voltage of proper
rotation is applied. The phase sequence monitor is only used in
remote starter applications.
N/A The Refrigerant Monitor auxiliary input signal indicates an alarm
condition.
N/A The Refrigerant Monitor auxiliary input is outside the 4-20 mA range. Check Signal At
N/A Air flow loss to the Refrigerant Monitor optical bench.
a. IFW to the chiller, MMR/MAR to the Refrigerant Monitor.
N/A The Refrigerant Monitor calibration failed.
a. IFW to the chiller, IFW to the Refrigerant Monitor.
N/A Refrigerant Monitor optical bench photo-interrupter failure.
a. IFW to the chiller, MAR to the Refrigerant Monitor.
N/A The Refrigerant Monitor external reset switch (Normally Closed) is
stuck in the "reset" state or the switch/jumper is missing.
N/A A undefined diagnostic detected by the Refrigerant Monitor.
a. IFW to the chiller, MMR to the Refrigerant Monitor.
N/A Refrigerant Monitor infrared optical source failure.
a. IFW to the chiller, MAR to the Refrigerant Monitor.
N/A The Refrigerant Monitor has read a refrigerant concentration greater
or equal to the level 3 setpoint.
N/A The Refrigerant Monitor has read a refrigerant concentration greater
or equal to the level 2 setpoint.
Cause Help Message
Check Main Power
Supply & Wiring
Check Main Power
Supply & Wiring
Check Main Power
Supply & Wiring
Check Starter
Module.
See
Troubleshooting
Service Bulletin
N/A
Input
See Refrigerant
Monitor IOM
Manual
See Refrigerant
Monitor IOM
Manual
Check Chopper
Wiring And
Connections
See Refrigerant
Monitor IOM
Manual.
See Refrigerant
Monitor IOM
Manual.
Check IR Source
Wiring And
Connections
N/A
N/A
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