Trane Ascend ACR C Series Installation, Operation And Maintenance Manual page 104

Diagnostics
Table 31. Diagnostics — main processor (continued)
Diagnostic
Affects Target
Name
AFD Interrupt
Chiller
Failure - xA
AFD Unexpected
Cprsr
Shutdown - xA
Chiller Service
Chiller
Recommended
Compressor
Discharge
Refrigerant Cprsr
Temperature
Sensor - xy
Condenser
Refrigerant Circuit
Pressure Sensor
Emergency Stop
Chiller
Feedback Input
Evap Water
Pump 1 Svc Chiller
Recommended
Evaporator
Circuit
Approach Error
Evaporator Diff
Water Pressure Chiller
Xdcr
Evaporator
Entering Water Chiller
Pressure
104
Severity
Persistence
Immediate
Shutdown and
Latch
Special Action
Normal NonLatch
Warning
Latch
Immediate Latch
Immediate Latch
Immediate Latch
Warning
Latch
Immediate Latch
Warning
Latch
Warning
Latch
Active Modes
[Inactive
Modes]
Respective AFD is reporting that it is still running the
compressor when the MP has commanded the drive/
compressor to be Off. This diagnostic is triggered if the AFD
running status remains in running for more than 16 seconds
after the MP initiates the OFF command. On detection and
until the controller is manually reset: this diagnostic shall be
active and the alarm relay shall be energized, the Evap
Pump Output will be energized, the effected compressor
AFD Intended to
will be continually commanded off, and be unloaded, while
be OFF
a normal stop shall be commanded to all other
compressors. For as long as compressor operation
continues, the MP shall continue oil return and fan control
on the circuit affected. During AFD interrupt failure, circuit
will not be confirmed off, so THR unit sequence should
continue running. If THR turns off due to a diagnostic or
lockout during AFD interrupt failure, the circuit reverts to air-
cooled condenser fan control within 1 second.
The AFD status reported back that it is stopped when the
MP thinks it should be running and no AFD diagnostic
exists. This diagnostic will be logged in the active buffer and
Running then automatically cleared. This diagnostic could be caused
by intermittent communication problems from the AFD to
the MP or due to mis-binding. Note: This is a Controller
diagnostic, not one originating from the AFD.
Service
Chiller service interval time has elapsed. Chiller service is
Messages
recommended.
Enabled
All Bad Sensor or LLID
All Bad Sensor or LLID
A. Emergency stop feedback input is open. An external
interlock has tripped. Time to trip from input opening to unit
All
stop shall be 0.1 to 1.0 seconds.
Service
Pump service recommended as service interval hours have
Messages
elapsed.
Enabled
The Evaporator approach temperature for the respective
circuit (ELWT – Evap Sat Temp Ckt x) is negative by more
Respective
than 10°F for 1 minute continuously while the circuit /
circuit running
compressor is operating. Either the Evap Leaving Water
Temp sensor or Evap Suction Rfgt Pressure Sensor Ckt x is
in error.
Bad Sensor or LLID
a. Display invalid value
All b. Flow calculation shall be disabled.
See Water_Flow_and_Tons_Sensing.doc specification for
additional information
Bad Sensor or LLID
a. Display invalid value
All b. Flow calculation shall be disabled.
See Water_Flow_and_Tons_Sensing.doc specification for
additional information
Criteria
AC-SVX003A-EN
Reset
Level
Local
Local
Remote
Remote
Remote
Local
Remote
Remote
Remote
Remote