Trane Ascend ACR C Series Installation, Operation And Maintenance Manual page 105

Table 31. Diagnostics — main processor (continued)
Diagnostic
Affects Target
Name
Evaporator
Entering Water
Chiller
Temperature
Sensor
Evaporator
Leaving Water Chiller
Pressure
Evaporator
Leaving Water
Chiller
Temperature
Sensor
Evaporator
Pump 1 Starts Chiller
Run Time Written
Evaporator
Refrigerant Pool
Circuit
Temperature
Sensor Error
Evaporator
Refrigerant Pool
Circuit
Temperature
Sensor
Evaporator
Chiller
Water Flow Lost
AC-SVX003A-EN
Severity
Persistence
Normal Latch
Warning
Latch
Normal Latch
Warning
NonLatch
Warning and
Latch
Special Action
Warning and
Latch
Special Action
Immediate NonLatch
Active Modes
[Inactive
Modes]
Bad Sensor or LLID. Note: Entering Water Temp Sensor is
used in EXV pressure control as well as ice making so it
All
must cause a unit shutdown even if ice or CHW reset is not
installed.
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
All Bad Sensor or LLID
Diagnostic is triggered when the Evap Pump 1 Starts Run
Time is manually over written. Diagnostic automatically
All
clears and is immediately placed into the Historic
Diagnostic Log.
This diagnostic can be triggered in two ways. There is an
ignore time of 2 minutes following circuit startup for both
criteria. The trip criteria is not evaluated until the ignore time
passes.
1.) The evaporator refrigerant pool temperature
measurement is larger than the evaporator entering water
temperature by more than 4°C (7.2°F) for 5 continuous
minutes.
2.) If the absolute value of the Actual Evap Pool Temp
Correction CktX is greater than the 'Evap Pool Temp
Ckt Energized Diagnostic Threshold CktX' AND the absolute value of the
[Ckt Not Pool Temp Error is greater than the 'Evap Pool Temp
Energized] Diagnostic Threshold CktX', the diagnostic will occur.
Continue to display the pool temperature measurement if
the diagnostic is active. If evaporator isolation valves are
installed, revert to Evaporator Shell Refrigerant Saturated
Temperature for freeze protection functions. If evaporator
isolation valves are not installed, revert to Evaporator
Saturated Temperature for freeze protection functions. Pool
Temp Sensor may have failed due to incorrect installation,
improper insulation, or an offset pool temperature
measurement typically caused by moisture intrusion.
Bad Sensor or LLID. Note: The Evap Pool Temp Sensors
are used for evaporator freeze protection (running and non-
running). Invalidate evaporator pool temperature sensor
measurement if this diagnostic is active. If evaporator
isolation valves are installed, revert to Evaporator Shell
All
Refrigerant Saturated Temperature for freeze protection
functions. If evaporator isolation valves are not installed,
revert to Evaporator Saturated Temperature for freeze
protection functions.
A. The Evaporator water flow switch input was open for
more than 6 contiguous seconds (or 20 seconds for thermal
dispersion type flow switch).
B. This diagnostic does not de-energize the evap pump
[All Stop Modes]
output.
C. 6 seconds of contiguous flow shall clear this diagnostic.
(further review needed when implementing thermal
dispersion for Pueblo)
Diagnostics
Criteria
Reset
Level
Remote
Remote
Remote
Local
Local
Remote
Remote
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