AC-SVX003A-EN
107
Table 31. Diagnostics — main processor (continued)
Diagnostic
Name
Affects Target Severity
Persistence
Active Modes
[Inactive
Modes]
Criteria
Reset
Level
High Evaporator
Refrigerant
Pressure
Chiller Immediate NonLatch All
The evaporator refrigerant pressure of either circuit has
risen above 190 psig. The evaporator water pump relay will
be de-energized to stop the pump regardless of why the
pump is running. The diagnostic will auto reset and the
pump will return to normal control when all of the evaporator
pressures fall below 185 psig. The primary purpose is to
stop the evaporator water pump and its associated pump
heat from causing refrigerant side pressures, close to the
evaporator relief valve setting, when the chiller is not
running, such as could occur with Evap Water Flow
Overdue or Evaporator Water Flow Loss Diagnostics.
Remote
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)-
120°F (48.9°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
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.
For GP4 with triple RTD temperature sensors, a
temperature greater than 265°F will generate this
diagnostic.
Local
High Pressure
Cutout - xy
Cprsr
Immediate Latch All
A high pressure cutout was detected; trip at 315 ± 5 PSIG.
See 'AFD High Pressure Cutout - xy' diagnostic for AFD
equivalent.
This is only applicable to the Electro-Mechanical starter (i.e.
GP2/GP2.5 Fixed Speed)
Local
High Refrigerant
Pressure 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
Chiller
Warning/Normal
NonLatch/Latch
Any Ckt
Energized
[No Ckts
Energized]
*Function: Not Enabled (Default): diagnostic is Non-
Latching and Warning. Enabled: diagnostic is Latching and
Normal Shutdown. 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 < 2F. 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
Diagnostics
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