Trane CITY RTSF Series Manual page 42

Maintenance Procedures
Oil Level Check
Figure 9 – Determining oil level in the oil separator
1 = Oil separator
2 = Valve
3 = 1/4" refrigeration hose
4 = Sight glass
5 = Minimum oil level
6 = Maximum oil level
How to measure the oil level:
1. Use the oil drain valve (bottom side) and the service valve on the oil separator (top side). This measurement can
be made, when the circuit is not running. Note: the bottom plate of the oil separator is approximately 25mm
thick.
2. The initial oil charge should be approximately at the level in of the above chart. This is the approximate oil level if
all the oil is in the oil lines, fi lter, and oil sump, and the unit is in vacuum so that there is no refrigerant dissolved
in the oil.
After the unit has run for a while, the oil level in the sump can vary greatly. However, if the unit has run 'normal'
conditions for a long time, the minimum and maximum oil levels should correspond to values shown in below table.
However excessive oil in the system will deteriorate the evaporator approach temperature.
Oil
separator Compressors type
size
8" "M" type
10" "N" type
The fi eld charging procedure depends on the circumstances that resulted in the need for oil charge.
1. Some services procedures may result in loss of small quantities of oil that must be replaced (oil analysis,
compressor fi lter replacement, re-tubing the evaporator, and so forth).
2. Additionally, some maintenance procedures may result in virtually all the oil being removed (compressor motor
burn or total removal of the charge to trouble shoot a unit).
3. Finally, leaks may result in a loss of oil that must be replaced.
Oil charging data.
The oil quantity is written on the nameplate of the unit.
42
Min. oil Max. oil
level (mm) level (mm)
50 mm 180 mm
50 mm 140 mm
RLC-SVX023B-GB