Carrier 38AU Installation, Start-Up And Service Instructions Manual page 25

38AUZ*25 Check Compressor Oil Level —
After adjusting the refrigerant charge, allow the unit to
run fully loaded for 20 minutes. Stop the compressors and
check the oil level. Oil level should be
sight glass (see Fig. 22).
1
/ (MAX)
2
1
/ (MIN)
3
Fig. 22 - - Recommended Oil Level — 38AUZ*25
1 1
/ to / up on the
3 2
C01377
Fig. 23 - - 38AUZ*16 Charging Chart (Novation)
IMPORTANT: Oil level should only be checked
when the compressors are off.
Add oil only if necessary to bring the oil into view in the
sight glass. If oil is added, run the circuit for an additional
10 minutes, then stop and check oil level. If the level
remains low, check the piping system for proper design
for oil return; also, check the system for leaks. If checking
the oil level with unit running in part load, let unit run one
hour, then run at full load for 10 minutes. If oil does not
return to acceptable sight glass levels, check for correct
suction piping and line sizing.
Final Checks —
Ensure that all safety controls are operating, control panel
covers are on, and the service panels are in place.
25
C10945