AC-SVX001A-EN
89
Table 27. Diagnostics — main processor (continued)
Diagnostic
Name
Affects
Target
Severity
Persistence
Active
Modes
[Inactive
Modes]
Criteria
Reset
Level
Evap Rfgt Pool
Temp Sensor
Error – Ckt2
Circuit
Info and
Special Action
Latch
Ckt Energized
[Ckt Not
Energized
The evaporator refrigerant pool temperature sensor
is indicating a temperature significantly warmer than
the evaporator entering water temperature (by more
than 7.2°F for 5 continuous min excluding ckt
nonoperation and a 2 min ignore time relative to ckt
startup). While this diagnostic is active, it will
invalidate the evaporator pool temperature sensor.
Freeze protection functions (i.e. freeze diagnostics
and Evap Pump Override) will default to the
respective evaporator pressure transducer and its
calculated saturation temperature
Local
Evap Spillover
Liquid Level
Sensor – Ckt1
Circuit Normal Latch All Bad Sensor or LLID Remote
Evap Spillover
Liquid Level
Sensor – Ckt2
Circuit Normal Latch All Bad Sensor or LLID Remote
Evap Water
Flow (Entering
Water Temp)
None Info NonLatch
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
Evaporator
Approach Error
– Ckt1
Circuit Immediate Latch
Respective
circuit running
The Evaporator approach temperature for the
respective circuit (ELWT – Evap Sat Temp Ckt 1) is
negative by more than 10°F for 1 minute
continuously while the circuit / compressor is
operating. Either the Evap Leaving Water Temp
sensor, or Evap Suction Rfgt Pressure Transducer Ckt
1 is in error
Remote
Evaporator
Approach Error
– Ckt2
Circuit Immediate Latch
Respective
circuit running
The Evaporator approach temperature for the
respective circuit (ELWT – Evap Sat Temp Ckt 2) is
negative by more than 10°F for 1 minute
continuously while the circuit / compressor is
operating. Either the Evap Leaving Water Temp
sensor, or Evap Suction Rfgt Pressure Transducer Ckt
2 is in error
Remote
Evaporator
Entering Water
Temp Sensor
Chiller Normal Latch All
Bad Sensor or LLID. Note: Entering Water Temp
Sensor is used in EXV pressure control as well as ice
making so it must cause a unit shutdown even if ice
or CHW reset is not installed
Remote
Evaporator
Leaving Water
Temp Sensor
Chiller Normal Latch All Bad Sensor or LLID Remote
Evaporator
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
Remote
DDiiaaggnnoossttiiccss
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