Diagnostics
72 RTAF-SVX001A-EN
Evaporator
Leaving Water
Temperature
Sensor
Evaporator
Leaving Water
Temp Sensor
Evap Leav
Water Temp
Sensor
Chiller Normal Latch All Bad Sensor or LLID Remote
Evaporator
Pump 1 Fault
Chiller
Immediate
or Warning
and Special
Action
NonLatch All
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 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.doc
Remote
Evaporator
Pump 2 Fault
Chiller
Immediate
or Warning
and Special
Action
NonLatch All
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 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.doc
Remote
Evaporator
Refrigerant Pool
Temperature
Sensor
Evap Rfgt Pool
Temp Sensor
Evap Rfgt Pool
Temp Sensor
Circuit
Info 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
Refrigerant Pool
Temperature
Sensor Error -
Cktx
Evap Rfgt Pool
Temp Sensor
Error - Cktx
Evap Pool Temp
Error Cktx
Circuit
Info and
Special
Action
Latch
Ckt Energized
[Ckt Not
Energized]
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. There is an ignore time of 2 minutes
following circuit startup. The trip criteria is not evaluated (and time
above the threshold is not counted) until the ignore time passes.
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.
Local
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
(Entering Water
Temp)
Evap Water
Flow (Entering
Water Temp)
Evap Flow (Ent
Water Temp)
Chiller Info Latch
Any Ckt
Energized [No
Ckts
Energized]
The entering evaporator water temp fell below the leaving evaporator
water temp by more than 2°F for 180 °F-sec, minimum trip time 30
seconds. It can warn of improper flow direction through the evaporator,
misbound water temperature sensors, improper sensor installation,
partially failed sensors, or other system problems. Note that either
entering or leaving water temp sensor or the water system could be at
fault.
Remote
Table 27. Main processor diagnostics (continued)
Diagnostic
Name
Affects
Target Severity Persistence
Active
Modes
[Inactive
Modes] Criteria
Reset
Level
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