Trane CVGF-SVU02B-E4 Operation And Maintenance Manual page 85

3. To reverse the oil pump motor
rotation, two leads must be
swapped on the oil pump
motor contactor. Be sure to
remove all power from the
unit before doing any
electrical wiring changes.
Note: Be sure to perform the
Bump Start test to determine
proper compressor rotation
before operating the chiller.
If the differential oil pressure
measured is below 12 psid (82
kPa), the oil filter may be
plugging or the regulator may
need adjustment.
4. Then check the pressure drop
across the oil filter, connect a
gauge to the service valve
before the oil filter and
another gauge to the service
valve after the oil filter.
Subtract the pressure reading
taken from after the oil filter
from the gauge before the oil
filter to obtain the pressure
drop. If the pressure drop is
excessive (more than 8 psid
(54 kPa)), shut the oil pump off
and replace the oil filter per
the procedure outlined
previously.
CVGF-SVU02B-E4
Periodic
Maintenance
5. When the oil filter change is
completed, check the
differential oil pressure and if
it is below 18 psid (124 kPa),
adjust the oil pressure
regulator to obtain a reading
of between 18 to 22 psid (124-
151 kPa).
If the pressure drop across the
filter is not excessive, but the
oil differential pressure is
below 18 psid, adjust the oil
pressure regulating valve to
obtain 18 to 22 psid (124-151
kPa) oil pressure. To increase
pressure, remove the oil
pressure regulator cap and
screw the regulator stem in a
clockwise direction. Be sure to
replace the cap and tighten
when adjustment is complete.
6. Remove the pressure gauges
when all diagnostic work is
complete. Be sure and replace
and secure any valve caps
which were removed.
CVGF Oil Pump
The oil pump for the CVGF is a
positive displacement, direct
drive pump, three phase motor.
The motor must be phased
correctly to provide positive
differential oil pressure. This
pump and motor is located
within the oil sump and can not
be serviced without recovering
the refrigerant and removing the
oil from the machine.
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