RLC-SVX09Q-EN
77
Table 32. Main processor diagnostics (continued)
Diagnostic
Name
Affects Target Severity
Persistence
Active Modes
[Inactive
Modes]
Criteria
Reset
Level
Evap Rfgt Liquid
Level Sensor –
Cktx
Circuit Normal Latch All Bad Sensor or LLID Remote
Evaporator
Approach Error
Circuit Immediate Latch
Respective
circuit running
The Evaporator approach temperature for the respective
circuit (ELWT – Evap Sat Temp Ckt x) is negative by more
than max(10°F,'Cooling Design Delta Temp(waterside)') for
1 minute continuously while the circuit / compressor is
operating. Either the Evap Leaving Water Temp sensor or
Evap Suction Rfgt Pressure Sensor Ckt x is in error.
note: 'Cooling Design Delta Temp(waterside)' is the TU
setpoint
Remote
Evaporator
Entering Water
Temperature
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
Temperature
Sensor
Chiller Normal Latch All Bad Sensor or LLID Remote
Evaporator
Water Flow Lost
Chiller Immediate NonLatch
[All Stop Modes]
The Evaporator water flow proof input was open for more
than 6 contiguous seconds. In the Normal Cooling and Ice
Building Modes, this diagnostic does not affect the Evap
Pump output, and it will generally remain on, In the Heating
Mode of operation, the Evap Pump shall be commanded off
excepting any freeze avoidance diagnostic overrides. 6
seconds of contiguous flow shall auto-reset this diagnostic.
Remote
Evaporator
Water Flow
Overdue
Chiller Normal NonLatch
Estab. Evap.
Water Flow on
going from
STOP to AUTO
or Evap Pump
Override
The evaporator water flow was not proven within 20
minutes of the Evaporator Water Pump Relay being
energized in normal “Stop” to “Auto” transition. In the case
where the pump is overridden to “On” per certain freeze
avoidance diagnostics, the delay on the callout of this
diagnostic will be shortened to 255 seconds. In Cooling and
Ice Building Modes the pump command status will not be
affected by this diagnostic and it will generally remain on. In
the Heating Mode of Operation, this diagnostic will
generally force the pump to be off, excepting certain freeze
avoidance diagnostic overrides.
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
Diagnostics
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