RLC-SVX09Q-EN
79
Table 32. Main processor diagnostics (continued)
Diagnostic
Name
Affects Target Severity
Persistence
Active Modes
[Inactive
Modes]
Criteria
Reset
Level
High Evaporator
Water
Temperature
Chiller
Warning 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 105°F (65.55°C), range 80°F (26.67°C)-
150°F(65.55°C) 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
Cprsr
Immediate Latch All
Any of the compressor’s motor winding temperature
sensors (RTD) is seen to be beyond the windings rated
temperature of 265°F (129.4°C)
Local
High Motor
Winding
Temperature - xA
Cprsr
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 Pressure
Cutout - xy
Cprsr
Immediate Latch All
A high pressure cutout was detected.
Local
High Refrigerant
Pressure Ratio -
xy
Cprsr
Immediate Latch
Cprsr Energized
High Vi GP2 Cprsr : The pressure ratio for the respective
compressor exceeded 12.3 for 1 contiguous minute while
any compressor is running normally or in service
pumpdown. This pressure ratio is a fundamental limitation
of the particular compressor design. The pressure ratio is
defined as Pcond (abs)/Pevap(abs)
Low Vi GP2 Cprsr: 5.61.
Remote
Inverted
Evaporator
Water
Temperature
Chiller
Warning/Normal
NonLatch/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. Diagnostic will auto clear if
the leaving water temp – entering water temp < 2°F. It can
warn of improper flow direction through the evaporator,
misbound water temperature sensors, improper sensor
installation, grossly inaccurate sensors, or other system
problems. Note that either entering or leaving water temp
sensor or the water system could be at fault.
Remote
Diagnostics
To Next Page
