Trane Ascend ACS 140 Installation, Operation And Maintenance Manual page 77

Table 29. Main process diagnostics (continued)
Affects
Diagnostic
Target
Name
Evaporator
Chiller
Pump 2 Fault
Low Suction
Circuit
Superheat
High
Compressor
Circuit
Pressure
Differential
Low
Refrigerant Circuit
Pressure Ratio
Low Discharge
Saturated
Circuit
Temperature
Loss of Charge
Circuit
Chiller Service
Chiller
Recommended
Evap Water
Pump 1 Svc Chiller
Recommended
Evap Water
Pump 2 Svc Chiller
Recommended
Mfr
Maintenance
Cprsr
Recommended
- xy
Restart Inhibit
Cprsr
Invoked - xy
AC-SVX002D-EN
Severity
Persistence
Immediate or
Warning and
NonLatch
Special Action
Immediate Latch
Immediate Latch
Normal Latch
Normal Latch
Immediate Latch
Warning
Latch
Warning
Latch
Warning
Latch
Warning
Latch
Warning
NonLatch
Active
Modes
[Inactive
Modes]
For systems with no evaporator pump, a single
evaporator pump, or a single inverter driving dual
evaporator pumps, an immediate shutdown shall be
performed. For multiple pump systems, detection of
a pump fault will generally cause pump control to
All
switch to the redundant pump. For single inverter,
dual pump configuration, switching to the redundant
pump can only happen after the fault is cleared.
Specific details of special action are described in
Evaporator_Water_Pump_Control.
Measured suction superheat stays below 2.22 °C for
one continuous minute in cooling mode or 3 minutes
Ckt Energized
in heating mode, with a 1 minute ignore time from
[Ckt Not
Energized]
Suction Superheat = suction temp – sat. suction
Ckt Energized
[Ckt Not Compressor involute pressure differential exceeded
Energized or allowable limits. See Compressor Involute Pressure
Operational Differential Protection spec for details.
Pumpdown]
The refrigerant pressure ratio between compressors
Ckt Energized
outlet and inlet of a given circuit exceeded allowable
[Ckt Not
limits. See Low Refrigerant Pressure Ratio Protection
Energized]
The discharge saturated temperature for the
Ckt Energized respective circuit was below 10 °C for more than
[Ckt Not 2250 °C-sec, with a 10 minutes ignore time from the
Energized] start of the circuit. Integration starts after the ignore
For Release 1.0, this feature is factory enabled for
glycol applications only. The diagnostic occurs if the
EXV (normal cooling mode only) is consistently and
significantly more open than internal models predict
Ckt Energized for the conditions. This would occur with lack of
[Ckt Not subcooling from the condenser, a condition that
Energized] generally suggests undercharging or charge loss.
Pressure sensor errors or excessive compressor
capacity over the commanded capacity could also
cause this diagnostic. (Adjustment is available to
mitigate nuisance tripping)
Service
Chiller service interval time has elapsed. Chiller
Messages
service is recommended.
Enabled
Service Pump service recommended as service interval hours
Messages
Service
Pump service recommended as service interval hours
Messages
Enabled
Service
Compressor service recommended as service
Messages
interval hours have elapsed.
Enabled
When restart inhibit warning is enabled, the warning
exists when unit has been inhibited from starting and
All
is cleared when a start of a compressor is possible
(Start-to-Start Timer expires)
Criteria
the start of the circuit.
temp.
spec for details
time is completed.
have elapsed.
have elapsed.
D D i i a a g g n n o o s s t t i i c c s s
Reset
Level
Remote
Local
Local
Local
Local
Local
Remote
Remote
Remote
Remote
Remote
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