Diagnostics
156 RTAC-SVX01J-EN
High Differential
Refrigerant Pressure
- Circuit 2
Circuit Normal Latch Cprsr Energized
The system differential pressure for the respective circuit was
above 275 Psid for 2 consecutive samples or more than 10
seconds
Remote
High Evaporator
Liquid Level - Circuit
1
Circuit Normal Latch
Starter Contactor
Energized
[all Stop modes]
The liquid level sensor is seen to be at or near its high end of
range for 80 contiguous minutes while the compressor is
running. (The diagnostic timer will hold, but not clear when the
circuit is off). Design: 80% or more of bit count corresponding
to +21.2 mm or more liquid level for 80 minutes)
Remote
High Evaporator
Liquid Level - Circuit
2
Circuit Normal Latch
Starter Contactor
Energized
[all Stop modes]
The liquid level sensor is seen to be at or near its high end of
range for 80 contiguous minutes while the compressor is
running. (The diagnostic timer will hold, but not clear when the
circuit is off). Design: 80% or more of bit count corresponding
to +21.2 mm or more liquid level for 80 minutes)
.
Remote
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 (and the chiller will be prevented from starting) 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
Info and
Special
Action (Pre
RTAC
Refresh
Rev 39)
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.
The leaving water temperature exceeded the high evap water
temp limit (TV service menu settable -default 105F) for 15
continuous seconds. The evaporator water pump relay will be
de-energized to stop the pump but only if it is running due to one
of the diagnostics listed on the left . The diagnostic will auto reset
and the pump will return to normal control when the
temperature falls 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 Evaporator
Water Temperature
Chiller
Immediate
Shutdown
(Beginning
with RTAC
Refresh
Rev 39 )
Latch
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.
The leaving water temperature exceeded the high evap water
temp limit (TV service menu settable -default 105F) for 15
continuous seconds, with one of the three diagnostics on the left
already active. The evaporator water pump relay will be de-
energized to stop the pump. The diagnostic can only be cleared
by a manual reset and will clear regardless of the temperature.
(although the diagnostic may reoccur based on the trip criteria).
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 a pump override to "on"
(as can be caused by a bad flow switches failure to close and
prove flow).
Local
High Oil
Temperature -
Compressor 1B
Cprsr 1B Immediate Latch All
The respective oil temperature as supplied to the compressor,
exceeded 200 F for 2 consecutive samples or for over 10
seconds. Note: As part of the Compressor High Temperature
Limit Mode (aka Minimum Limit), the running compressor's
female load step will be forced loaded when its oil temperature
exceeds 190F and returned to normal control when the oil
temperature falls below 170 F.
Remote
High Oil
Temperature -
Compressor 2B
Cprsr 2B Immediate Latch All
The respective oil temperature as supplied to the compressor,
exceeded 200 F for 2 consecutive samples or for over 10
seconds. Note: As part of the Compressor High Temperature
Limit Mode (aka Minimum Limit), the running compressor's
female load step will be forced loaded when its oil temperature
exceeds 190F and returned to normal control when the oil
temperature falls below 170 F.
Remote
Table 67. Main processor diagnostics (continued)
Diagnostic Name
Affects
Target Severity
Persist-
ence
Active Modes
[Inactive
Modes] Criteria
Reset
Level
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