Diagnostics
84
RTAF-SVX001K-EN
Evaporator Refrigerant Pool Temperature
Sensor
Evap Rfgt Pool Temp Sensor
Evap Rfgt Pool Temp Sensor
Circuit
Warning
and Special
Action
Latch
All
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 Refrigerant Saturated Temperature
for freeze protection functions. If
evaporator isolation valves are not
installed, revert to Evaporator Saturated
Temperature for freeze protection
functions.
Remote
Evaporator Shell Refrigerant Pressure
Sensor
Evaporator Shell Rfgt Pressure Sensor
Evap Shell Rfgt Press Sensor
Circuit
Normal
Latch
All
Bad Sensor or LLID. Note: The evaporator
shell refrigerant pressure sensor is used to
avoid high shell pressures, to equalize
evaporator and condenser pressure prior
to circuit start, and as a backup sensor to
the pool temperature sensor.
Remote
Evaporator Water Flow Lost – Pump 1
Evap Water Flow Lost Pump 1
Chiller
Warning
and Special
Action
NonLatch
All
For dual evaporator pump configurations
only. Evaporator Water Flow Lost
diagnostic occurred while Pump 1 was the
selected pump. Specific details of special
action are described in
Evaporator_Water_Pump_Control.doc
Remote
Evaporator Water Flow Lost – Pump 2
Evap Water Flow Lost Pump 2
Chiller
Warning
and Special
Action
NonLatch
All
For dual evaporator pump configurations
only. Evaporator Water Flow Lost
diagnostic occurred while Pump 2 was the
selected pump. Specific details of special
action are described in
Evaporator_Water_Pump_Control.doc
Remote
Evaporator Water Flow Lost
Evap Water Flow Lost
Chiller Immediate
NonLatch
[All Stop
modes]
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 output. C. 6 seconds of contiguous
flow shall clear this diagnostic.
Remote
Evaporator Water Flow Overdue –
Pump 1
Evap Wtr Flow Overdue Pump 1
Chiller
Warning
and Special
Action
NonLatch
All
After the pump request was activated, the
evaporator water flow overdue wait time
elapsed before water flow was established.
Special action is to keep the evap pump
request active in a diagnostic override
mode. See
Evaporator_Water_Pump_Control.doc
Remote
Evaporator Water Flow Overdue – Pump
2
Evap Wtr Flow Overdue Pump 2
Chiller
Warning
and Special
Action
NonLatch
All
After the pump request was activated, the
evaporator water flow overdue wait time
elapsed before water flow was established.
Special action is to keep the evap pump
request active in a diagnostic override
mode. See
Evaporator_Water_Pump_Control.doc
Remote
Evaporator Water Flow Overdue
Evap Water Flow Overdue
Chiller
Normal
NonLatch
Estab. Evap.
Water Flow on
going from
STOP to AUTO
or Evap Pump
Override.
Evaporator water flow was not proven
within 20 minutes of the Evaporator water
pump relay being energized in normal
“Stop” to “Auto” transition. If the pump is
overridden to “On” for certain diagnostics,
the delay on diagnostic callout shall be
only 255 seconds. The pump command
status will not be effected by this
diagnostic in either case.
Remote
Table 33. Main processor diagnostics (continued)
Diagnostic Name
Affects
Target
Severity Persistence
Active
Modes
[Inactive
Modes]
Criteria
Reset
Level