Trane CVGF-SVU02B-E4 Operation And Maintenance Manual page 70

Oil Temperature Control
The oil heater is used to
maintain the oil temperature
within +/- 2.5°F (1.4°C) of the oil
temperature control setpoint. The
oil heater is commanded off when
the oil pump is commanded on.
If the oil temperature is at or
below the Low Oil Temperature
Cutout setpoint, this diagnostic
will be issued and stops the
compressor. This diagnostic is
ignored for the first 10 minutes
of compressor run. After that, if
the oil temperature falls below
this cutout temperature for more
than 60 consecutive seconds this
diagnostic is issued.
Low Oil Temperature Cutout
If the oil temperature is at or
below the Low Oil Temperature
Cutout, for more than 60
consecutive seconds this
diagnostic will be issued
stopping the compressor.
This diagnostic does not take
affect during the first 10 minutes
of compressor run.
70
Machine Protection and
Adaptive
High Oil Temperature Cutout
This is a latching diagnostic
resulting in an immediate
shutdown. Default Setpoint
value: 165°F (73.9°C)
Implemented to avoid
overheating of the oil and the
bearings.
If the oil temperature is at or
above the High Oil Temperature
Cut-out setpoint this diagnostic
will be issued, which will stop
the compressor. If Oil
Temperature violates this
temperature cut-out for more
than 120 seconds, this diagnostic
is issued.
Manual Oil Pump Control
The oil pump control accepts
commands to turn on the oil
pump. The manual oil pump
choices will be "Auto" or "On."
When the oil pump is
commanded "On," it will revert
to "Auto" in 10 minutes, and is
adjustable at DynaView
TechView ™ .
Controls Chilled Water Reset
(CWR)
Chilled water reset is designed
for those applications where the
design chilled water temperature
is not required at partial load. In
these cases, the leaving chilled
water temperature setpoint can
be reset upward using the CWR
features.
When the CWR function is based
on return water temperature, the
CWR feature is standard. When
the CWR function is based on
outdoor air temperature, the
CWR feature is an option
requiring an outdoor
temperature sensor.
The type of CWR is selected in
the Operator Interface settings
Menu along with the Reset Ratio,
Start Reset Setpoint, and the
Maximum Reset Setpoint.
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CVGF-SVU02B-E4