Diagnostics
RTAF-SVX001A-EN
75
High Evaporator
Water
Temperature
High Evap
Water
Temperature
Chiller
Info and
Special
Action
NonLatch
Only effective
if either
1)Evap Wtr
Flow Overdue
2)Evap Wtr
Flow Loss or
3)Low Evap
Rfgt Temp,-
Unit Off,
diagnostic is
active.
Either the leaving or the entering water temperature exceeded the high
evap water temp limit (TU service menu settable –default
105F(65.55C), range 80F(26.67C)-150F(65.55C) for 15 continuous
seconds. The evaporator water pump relay will be de-energized to stop
the pump but only if it is running due one of the diagnostics listed on
the left. The diagnostic will auto reset and the pump will return to
normal control when both the entering and leaving temperatures fall
5°F below the trip setting. The primary purpose is to stop the
evaporator water pump and its associated pump heat from causing
excessive waterside temperatures and waterside pressures when the
chiller is not running but the evap pump is on due to either Evap Water
Flow Overdue, Evaporator Water Flow Loss, or Low Evap Temp – Unit
Off Diagnostics. This diagnostic will not auto clear solely due to the
clearing of the enabling diagnostic.
Remote
High Motor
Winding
Temperature –
xA
High Mtr
Windng Temp -
xA
Circuit
Immediate Latch
All
The respective compressor’s motor winding thermostat is detected to
be open. The compressor shall stop within 5 seconds of this diagnostic.
Local
High Oil
Temperature -
xy
Cprsr
Immediate Latch
All
[compressor
run unload or
compressor
not running]
The oil temperature entering the compressor exceeded 199.4°F.
Remote
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 UC800 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
LCI-C Software
Mismatch: Use
BAS Tool
LCI-C Software
Mismatch
Chiller
Info
Nonlatch
All
The neuron software in the LCI-C module does not match the chiller
type. Download the proper software into the LCI-C neuron. To do this,
use the Rover service tool, or a LonTalk® tool capable of downloading
software to a Neuron 3150®.
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
Table 27.
Main processor diagnostics (continued)
Diagnostic
Name
Affects
Target Severity Persistence
Active
Modes
[Inactive
Modes]
Criteria
Reset
Level
