Trane CVGF500 Installation, Operation & Maintenance Manual page 121

8. After shutting the oil pump off, check the oil level in the sump sight glasses. The
9. If the oil level is below the center of the lower sight glass, charge oil into the sump
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.
2. Open the oil sump drain valve and allow the vacuum to draw the oil into the sump
3. Close the oil sump drain valve and remove the oil charging line. Reinstall the oil
4. Make sure the oil heaters are energized and the oil is up to temperature (greater
5. Continue pulling a vacuum on the unit to remove any residual moisture or
6. After charging the unit with refrigerant, operate the oil pump in the manual mode
Replacing the Oil Filter
The oil filter should not be changed unless absolutely required due to plugging, which
will shut the chiller off on low oil pressure or if the oil is required to be changed. To re-
place the oil filter, use the following procedure:
1.
2. Locate the two oil filter isolation valves (See Figure 40).
3. Connect an approved refrigerant recovery unit for R134a to the 1/4 inch Schrader
4. Close both isolation valves.
5. Recover the refrigerant and oil out of the oil filter cavity.
6. Remove the oil filter cover by removing the bolts and loosening the Roto-Lock con-
CVGF-SVX03B-EN
pump" screen. Turn the oil pump on in manual mode and let it run for several min-
utes. This will charge the oil lines and oil cooler with oil.
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.
as outlined in step 4.
Connect one end of an oil charging line to an oil supply (15 gallons (56.8 l) total re-
quired) and the other end to the oil sump drain valve located at the bottom of the
oil sump (See Figure 40). 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.
until the upper sight glass ball is located in the center of the upper sight glass.
drain valve cap and tighten securely.
than 122°F (50°C)).
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-con-
densables 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 mi-
crons (0.1 mm Hg) in a 2 hour period.
as outlined in step 7 in the preceding procedure and follow that procedure if addi-
tional oil is required to bring the level between the center of the two sight glasses.
Be sure the chiller is in the Stop mode.
valve on the oil filter inlet isolation valve to allow removal of oil and refrigerant
from the oil filter cavity.
nector on the outlet oil filter isolation valve.
When removed, do not allow any contaminants to get on the oil filter cover. Re¬in-
stalling a contaminated oil filter cover could decrease the life of the compressor.
Periodic Maintenance
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