Trane R Series Installation, Operation And Maintenance Manual page 155

Diagnostics
Table 67. Main processor diagnostics (continued)
Affects
Diagnostic Name Target Severity
Evaporator Entering Chilled
Water Temperature Water
Sensor Reset
Evaporator Leaving
Water Temperature Chiller
Sensor
Evaporator Liquid
Level Sensor - Circuit Immediate
Circuit 1
Evaporator Liquid
Level Sensor - Circuit Immediate
Circuit 2
Evaporator Rfgt
Circuit
Drain - Circuit 1
Evaporator Rfgt
Circuit
Drain - Circuit 2
Evaporator Water
Flow (Entering Chiller
Water Temp)
Evaporator Water
Flow (High Approach
Chiller
Temperature)-
Circuit 1
Evaporator Water
Flow (High Approach
Chiller
Temperature)-
Circuit 2
Evaporator Water
Chiller Immediate NonLatch
Flow Lost
Evaporator Water
Chiller
Flow Overdue
External Chilled
None
Water Setpoint
External Current
None
Limit Setpoint
High Differential
Refrigerant Pressure Circuit
- Circuit 1
RTAC-SVX01J-EN
Active Modes
Persist- [Inactive
ence Modes]
Info Latch
Normal Latch
Latch
Latch
Circuit non-
running modes
NA Latch [Drain Valve
commanded
closed]
Circuit non-
running modes
NA Latch [Drain Valve
commanded
closed]
Any Ckt Energized
Immediate
Latching [No Ckts
Shutdown
Energized]
Ckt Energized
Immediate
Latching [Ckt Not
Shutdown
Energized]
Ckt Energized
Immediate
Latching [Ckt Not
Shutdown
Energized]
Whenever Evap
Pump is
commanded on
due to Auto mode
and certain off-
cycle diagnostics
Whenever Evap
Pump is
commanded on
Normal NonLatch
due to Auto mode
and certain off-
cycle diagnostics
Info NonLatch
Info NonLatch
Normal Latch Cprsr Energized
Bad Sensor or LLID a. Normal operation, no effects on control.
b. Chiller shall remove any Return or Constant Return Chilled
All
Water Reset, if it was in effect. Apply slew rates per Chilled
Water Reset spec.
All Bad Sensor or LLID
All Bad Sensor or LLID
All Bad Sensor or LLID
This diagnostic is effective only with Remote Evap units. The
liquid level of the respective evaporator was not seen to be below
the level of -21.2 mm within 5 minutes of the commanded
opening of its Drain Valve Solenoid. The diagnostic will not be
active if the drain valve is commanded closed.
This diagnostic is effective only with Remote Evap units. The
liquid level of the respective evaporator was not seen to be below
the level of -21.2 mm within 5 minutes of the commanded
opening of its Drain Valve Solenoid Valve. The diagnostic will not
be active if the drain valve is commanded closed.
The entering evaporator water temp fell below the leaving
evaporator water temp by more than 2 F for 180 F-sec,
minimum trip time 1 minute.
Large evaporator approach temps, low evap sat temps, and
presence of liquid refrigerant, suggest this circuit is running with
no or reversed evaporator water flow.
Large evaporator approach temps, low evap sat temps, and
presence of liquid refrigerant, suggest this circuit is running with
no or reversed evaporator water flow.
a. The Evaporator water flow switch input was open for more
than 6-10 sec (HV binary input) or 20-25* sec (for factory mtd
low voltage binary input)
energize the evap pump output c. 6-10 seconds of contiguous
flow shall clear this diagnostic. d. Even though the pump times
out in the STOP modes, this diagnostic shall not be called out in
the STOP modes, (with the exception of pump override due to
certain off-cycle diagnostics). * could be longer if water temps
are rapidly changing warmer
Evaporator water flow was not proven within 4:15 (RTAC Rev 20
and earlier) or 20:00 (RTAC Rev 21) of the Evaporator water
pump relay being energized. With SW Rev 17.0 and earlier, the
diagnostic will de-energize the Evaporator Water Pump output.
It will be re-energized if the diagnostic clears with the return of
flow and the chiller will be allowed to restart normally (to
accommodate external control of pump) With SW Rev 18.0 and
later, the pump command status will not be effected. In the case
of certain "Off-cycle" diagnostics in which the pump is
overridden to on, the delay to callout of the diagnostic is
shortened to 4:15.
a. Function Not "Enabled": no diagnostics. b. "Enabled ": Out-
Of-Range Low or Hi or bad LLID, set diagnostic, default CWS to
All next level of priority (e.g. Front Panel SetPoint). This Info
diagnostic will automatically reset if the input returns to the
normal range.
a. Not "Enabled": no diagnostics. b. "Enabled ": Out-Of-Range
Low or Hi or bad LLID, set diagnostic, default CLS to next level
All
of priority (e.g. Front Panel SetPoint. This Info diagnostic will
automatically reset if the input returns to the normal range.
The system differential pressure for the respective circuit was
above 275 Psid for 2 consecutive samples or more than 10
seconds.
Criteria
b. This diagnostic does not de-
Reset
Level
Remote
Remote
Remote
Remote
Remote
Remote
Remote
Remote
Remote
Remote
Remote
Remote
Remote
Remote
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