Trane CVGF-SVU02B-E4 Operation And Maintenance Manual page 82

3. Attach the oil transfer hose of
the recovery unit oil pump to
the oil sump charging and
drain valve and evacuate.
4. Open the oil charging valve on
the bottom of the oil tank of
the CVGF and operate the oil
recovery and recharge unit oil
pump to charge the oil into
the tank.
5. When the oil is at the center of
the upper sight glass, stop the
transfer of oil.
6. Energize the oil heaters.
7. At the control panel, go to the
Service Tests menu and scroll
down to the "oil pump"
screen. Turn the oil pump on
in manual mode and let it run
for several minutes. This will
charge the oil lines and oil
cooler with oil.
8. After shutting the oil pump
off, check the oil level in the
sump sight glasses. The level
should be between the center
of the upper glass and center
of the lower sight glass. Float
balls are installed in each sight
glass to allow easy level
determination.
9. If the oil level is below the
center of the lower sight glass,
charge oil into the sump as
outlined in step 4.
82
Periodic
Maintenance
10. Close the oil sump drain
valve and remove the oil
charging line.
11. Reinstall the oil drain valve
cap and tighten securely.
Unit in a Vacuum.
1. Connect one end of an oil
charging line to an oil supply
(15 gallons (56.8 l) total
required) and the other end to
the oil sump drain valve
located at the bottom of the
oil sump (See Figure 23). If
possible, evacuate the oil
charging line to remove any
non-condensables and
moisture. This will require a
shutoff valve on the oil supply
side of the line and an access
valve located on the line itself.
2. Open the oil sump drain valve
and allow the vacuum to draw
the oil into the sump until the
upper sight glass ball is
located in the center of the
upper sight glass.
3. Close the oil sump drain valve
and remove the oil charging
line. Reinstall the oil drain
valve cap and tighten
securely.
4. Make sure the oil heaters are
energized and the oil is up to
temperature (greater than
122°F (50°C)).
5. Continue pulling a vacuum on
the unit to remove any
residual moisture or non-
condensables, which may
have been introduced during
the oil charging. A vacuum of
at least 500 microns (0.5 mm
Hg) should be attained before
blanking off the vacuum
pump. A vacuum rise test
should be performed to insure
all non-condensables and
moisture have been removed
from the system before
charging the unit with
refrigerant 134a. The vacuum
level should not rise by more
than 100 microns (0.1 mm Hg)
in a 2 hour period.
6. After charging the unit with
refrigerant, operate the oil
pump in the manual mode as
outlined in step 7 in the
preceding procedure and
follow that procedure if
additional oil is required to
bring the level between the
center of the two sight
glasses.
CVGF-SVU02B-E4