172 CG-SVX17D-EN
Diagnostics
High Evaporator Water Temperature
High Evaporator Water Temperature
High Evap Water Temperature
Chiller
Info and
Special Action
NonLatch
Only effective if
either
1) Evaporator
Water Flow
Overdue,
2) Evaporator
Water Flow Lost,
3) Low Evap
Water Temp: Unit
Off, diagnostic is
active.
The leaving water temperature
exceeded the high evap water temp
setting (TV service menu settable
– default 55.0°C (131°F)) 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 2.778°C (5°F) below the trip
setting. The primary purpose is to stop
the evaporator water pump and its
associated pump heat from causing
excessive water-side temperatures
and water-side pressures when the
unit is not running but the evap pump
is on due to either Evaporator Water
Flow Overdue, Evaporator Water Flow
Lost, or Low Evap Water Temp – Unit
Off diagnostics. This diagnostic will not
auto clear solely due to the clearing of
the enabling diagnostic.
*at unit installation, especially
reversible units, high evap water temp
setting will need to be written.
Remote
High Suction Refrigerant Pressure
High Suction Refrigerant Pressure
High Suction Rfgt Press
Chiller Immediate NonLatch All
Any circuit’s suction pressure has risen
above 95% of the high pressure cutout
setting. 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 circuits’ suction
pressures fall below 85% of the high
pressure cutout setting.
The primary purpose is to stop the
evaporator water pump and its
associated pump heat from causing
refrigerant side pressures close to the
relief valve setting when the chiller is
not running, such as could occur with
Evaporator Water Flow Overdue,
Evaporator Water Flow Lost, or Low
Evap Water Temp – Unit Off
diagnostics. This condition is unlikely
unless a discharge isolation valve is
installed and closed.
Remote
High Pressure Cutout
High Pressure Cutout
High Pressure Cutout
Circuit Immediate Latch All
The high pressure cutout switch
recognized a high pressure. See High
Suction Refrigerant Pressure above for
more details.
Local
High Discharge Refrigerant Pressure
High Discharge Refrigerant Pressure
High Discharge Rfgt Press
Circuit Immediate Latch All
Discharge pressure exceeded the high
pressure cutout setpoint + 100 kPa.
Likely cause: failed or incorrectly set
high pressure cutout switch. Prevents
release of refrigerant through relief
valve.
Local
Emergency Stop
Emergency Stop
Emergency Stop
Chiller Immediate Latch All Emergency Stop input is open. Local
Starts/Hours Modified
Starts/Hours Modified
Starts/Hours Modified
Cprsr Warning NonLatch All
A counter for compressor starts or
hours has been modified by TechView.
This diagnostic is immediately and
automatically cleared and thus can
only be seen in the historic diagnostic
list.
NA
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