AC-SVX003A-EN
111
Table 31. Diagnostics — main processor (continued)
Diagnostic
Name
Affects Target Severity
Persistence
Active Modes
[Inactive
Modes]
Criteria
Reset
Level
Starts/Hours
Modified - xy
Cprsr Warning
NonLatch All
The current value for the cumulative starts and or hours for
the given compressor have been modified by a write
override from TU in any running mode. The diagnostic will
only appear in the Historic Alarms list.
Remote
Suction
Refrigerant
Pressure Sensor
- xy
Cprsr
Immediate Latch All Bad Sensor or LLID Remote
Unexpected
Starter Shutdown
- xy
Cprsr
Normal NonLatch
All Cprsr
Running modes,
Starting, Running
and Preparing to
Shutdown
The Starter module status reported back that it is stopped
when the MP thinks it should be running and no Starter
diagnostic exist. This diagnostic will be logged in the active
buffer and then automatically cleared. This diagnostic could
be caused by intermittent communication problems from
the Starter to the MP or due to mis-binding
Local
Very Low
Evaporator
Refrigerant
Pressure - xy
Chiller Immediate Latch All
The respective circuit’s evaporator pressure dropped below
80% of the current Low Evap Refrigerant Press Cutout
setting (see above) or 8 psia, whichever is less, regardless
of the running state of the circuit’s compressor. Note: Unlike
previous products, even if the circuit associated with the
suction pressure sensor is locked out, it will not defeat the
protection afforded by this diagnostic.
Local
Write Command
Failure Energy
Meter X
Chiller
Warning
Latch All
Loss of communication to the Energy Meter during write
command process (Controller writes to Energy Meter). Or
Energy Meter X's 'Command Status' returns value that is
NOT equal to 0 or 3 (0: successful, 3: in Progress).
Note: This diagnostic is applied to Schneider energy meter
only.
Remote
Write Value
Failure Energy
Meter X
Chiller
Warning
Latch All
The read back value is not equal the written value. It will be
tripped after two retries of write failure.
Note: This diagnostic currently applies to Trane Enercept
(Veris) energy meter only.
Remote
Communication Diagnostics
Table 32. Diagnostics — communication
Diagnostic
Name
Affects Target Severity
Persistence
Active Modes
[Inactive
Modes]
Criteria
Reset
Level
Comm Loss:
Condenser
Receiver Tank
Valve
Circuit
Warning
Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period.
Remote
Comm Loss:
Condenser
Refrigerant
Pressure
Circuit Immediate Latch All
Continual loss of communication between the MP and the
Functional ID has occurred for a 30 second period.
Remote
Comm Loss:
Electronic
Expansion Valve
1
Circuit Normal Latch All
Continual loss of communication between the MP and the
EXV Step Status has occurred for a 30 second period, OR
EXV Steps Maximum Position has not been received. If
EXV Steps Maximum Position has not been received, MP
will periodically request EXV Steps Maximum Position,
since it is only transmitted upon request.
Remote
Diagnostics
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