Trane CVGF-SVU02B-E4 Operation And Maintenance Manual page 19

5. Post-lube: The oil pump
lubricates the bearings for 60
seconds after the compressor
is stopped to ensure bearings
remain lubricated as the
compressor coasts to a stop.
If a start command is issued
while in post-lube, a quick restart
will be performed.
The post-lube mode is indicated
to the user on DynaView
TechView .
™
6. Manual: The oil pump can be
commanded on and off in a
manual mode.
CVGF-SVU02B-E4
General
Information
Oil Temperature Control
The oil heater is used to
maintain the oil temperature
within +/- 2.5°F (4.5°C) of the oil
temperature control setpoint.
The oil heater is commanded off
when the oil pump is
commanded on.
Oil Differential Pressure
Check
™ and
The Oil Differential Pressure
Check validates the oil
differential pressure before the
oil pump is turned on. This check
in necessary in case the
differential pressure switch is
not operational. Without this
check, the differential oil
pressure feedback is gone. This
check is made after post-lube is
complete to verify that the
differential pressure has
dropped to indicate no oil flow.
Here are the details:
•
CH530 verifies that the
pressure switch is reading no
differential pressure with the
oil pump off before proceeding
with pre-lube.
•
CH530 displays a mode
Waiting for Low Oil Differential
Press.
•
The check is made if oil pump
is off and before it is turned on.
•
CH530 allows five minutes for
the differential oil pressure
switch to open.
•
This check is performed on
power up or reset also. If a
MPL occurred or power up was
within the post-lube time, oil
pump is running so do not do
the check.
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