Diagnostics
RTAF-SVX001A-EN
73
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 15 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. (further
review needed when implementing thermal dispersion for Pueblo)
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
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
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
Excessive
Condenser
Pressure
Circuit
Immediate Latch
All
The condenser pressure sensor of this circuit has detected a condensing
pressure in excess of the design high side pressure as limited by the
particular compressor type.
Remote
External Chilled
Water Setpoint
Ext Chilled Wtr
Setpt
Chiller
Info
Latch
All
a. Function Not “Enabled”: no diagnostics. b. “Enabled “: Out-Of-Range
Low or Hi or bad LLID, set diagnostic, default CWS to next level of
priority (e.g. Front Panel SetPoint).
Remote
External
Demand Limit
Setpoint
Ext Demand
Limit Setpoint
Chiller
Info Latch
All
a. Not “Enabled”: no diagnostics. b. “Enabled “: Out-Of-Range Low or
Hi or bad LLID, set diagnostic, default CLS to next level of priority (e.g.
Front Panel SetPoint.)
Remote
EXV Pressure
Equalization
Failed
EXV Press
Equalization Fail
Circuit
Immediate Latch
All
EXV Pressure Equalization process failed to meet the equalization
criteria within the allotted time.
Remote
Heat Recovery
Entering Water
Temperature
Sensor
Heat Recovery
Entering Water
Temp Sensor
Heat Rcvry Ent
Water Temp
Chiller
Info
Latch
All
Bad Sensor or LLID
Remote
Table 27.
Main processor diagnostics (continued)
Diagnostic
Name
Affects
Target Severity Persistence
Active
Modes
[Inactive
Modes]
Criteria
Reset
Level