Diagnostics
RTAF-SVX001K-EN
87
High Pressure Cutout - xy
Cprsr
Immediate
Latch
All
A high pressure cutout was detected; trip
at 315 ± 5 PSIG. For AFD compressor
configurations, the HPC is connected
directly to the AFD and the Symbio™ 800
will get an AFD Fault – xA diagnostic when
the HPC is tripped.
Local
High Refrigerant Pressure Ratio - xy
High Rfgt Press Ratio - xy
Cprsr
Immediate
Latch
Cprsr
Energized
The pressure ratio for the respective circuit
exceeded 12.3 for 1 contiguous minute
while any compressor is running or in
service pumpdown. This pressure ratio is a
fundamental limitation of the HiVi
compressor. The pressure ratio is defined
as Pcond (abs)/Pevap(abs).
Remote
Inverted Evaporator Water Temperature
Inverted Evap Water Temp
Chiller
Warning
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
Liquid Line Pressure Sensor
Circuit
Normal
Latch
All
Bad Sensor or LLID. Note: This is the
subcooled liquid line pressure sensor.
Remote
Liquid Line Temperature Sensor
Liquid Line Temp Sensor
Liquid Line Temp Sensor
Circuit
Normal
Latch
All
Bad Sensor or LLID. Note: This is the
subcooled liquid line temp sensor.
Remote
Loss of Oil for Compressor (Running)
Loss of Oil for Cprsr (Run)
Circuit Immediate
Latch
Starter
Contactor
Energized
In running modes, Oil Loss Level Sensor
detects lack of oil in the oil sump feeding
the compressor (distinguishing a liquid
flow from a vapor flow).
Local
Loss of Oil for Compressor (Stopped)
Loss of Oil for Cprsr (Stop)
Circuit
Immediate
and Special
Action
Latch
Compressor
Pre-start [all
other modes]
Oil Loss Level Sensor detects a lack of oil
in the oil sump feeding the compressor for
90 seconds after EXV preposition is
completed (and before EXV equalization, if
applicable) on an attempted circuit start.
Note: Compressor start is delayed pending
oil detection during that time, but not
allowed once the diagnostic occurs.
Local
Low Differential Refrigerant Pressure - xy
Low Differential RfgtPressure - xy
Low Diff Rfgt Press - xy
Cprsr
Immediate
Latch
Cprsr
Energized
The system differential pressure for the
respective circuit was below the greater of
25 psid (240.5 kPa) or the pressure ratio
listed in the table in GP2 Compressor Type
FSpec while the compressor is running for
a period of time dependent on the deficit
(15 sec ignore time from circuit start) –
refer to the Oil Flow Protection
specification for the time to trip function.
Remote
Low Discharge Superheat - xy
Cprsr
Normal
Latch
Any Running
Mode
While Running Normally, the Discharge
Superheat was less than the Low
Discharge Superheat Setpoint for more
than 6500 degree F seconds. At circuit
startup, the Discharge Superheat will be
ignored for 5 minutes.
Remote
Table 33. Main processor diagnostics (continued)
Diagnostic Name
Affects
Target
Severity Persistence
Active
Modes
[Inactive
Modes]
Criteria
Reset
Level
