Trane R Series Installation Operation & Maintenance page 111

111
Maintenance Procedures
Field Oil Charging Procedure
Use the initial charging procedure under
the following circumstances:
• When virtually all of the oil has been
removed.
• If the oil charge is removed from the
compressor and oil system only but the
unit has been run for less than 15 min-
utes.
• If the oil charge is removed from the
compressor and oil system only and the
unit has been run for more than 15 min-
utes. However, reduce the amount of oil
added to the unit by the normal quantity
of oil in refrigeration system.
NOTE: This procedure can be followed
even with the refrigerant charge isolated
in the evaporating section of the unit.
If small quantities of oil were removed
to service refrigeration components,
such as the evaporator, simply replace
the oil that was removed into the ser-
viced component prior to vacuum and
recharge of the refrigerant.
If oil was removed from the compres-
sor only to service a compressor or
change the oil filter follow this proce-
dure:
1. If the compressor is a new compres-
sor or has been removed from the sys-
tem and reworked, add 1 quart (2 lb.) oil
to the motor cavity prior to installing the
compressor into the chiller.
2. Install the compressor in the system.
Make sure that the filter shut off valve
is closed. Other compressor isolation
valves may also be closed depending
upon the service that was completed.
For example, changing the oil filter
would require the compressor to be iso-
lated and pulled into vacuum.
NOTE: Make sure that compressor is
not pressurized.
3. Open the flare fitting on the oil line
shut off valve.
4. Open the flare fitting on the filter hous-
ing. This is the port that must be used to
put oil into the compressor.
5. Install charging hose on oil charging
port (with schrader valve) and the other
on the oil canister.
6. Lift the oil canister, or use a pump, to
pour oil into the filter housing.
7. When oil comes out of the flare fitting
on the oil line shut off valve the filter is
full. Stop adding oil.
8. Put the cap on the flare on the oil line
shut off valve, remove the charging hose
and put the cap back on the flare on the
filter housing.
9. Vacuum the compressor (low side)
and prepare it for inclusion in the sys-
tem.
There is a service valve on the suction
line and on the evaporator. Use these
valves to vacuum the compressor.
10. Open the oil line shut off valve. Se-
vere damage to the compressor can re-
sult if the oil line shut off valve is closed
when the compressor is started.
CAUTION
Compressor Damage!
Catastrophic damage to the compres-
sor will occur if the oil line shut off
valve or the isolation valves are left
closed on unit start-up.
11. Open the other compressor isolation
valves.
NOTE: This procedure assumes that the
oil that is put into the filter housing does
not have contaminants such as non-
condensable gases. The oil forces these
gases out of the filter and oil line shut off
valve without the need to pull a vacuum
on this small volume. If the oil has been
in an open container or is otherwise con-
taminated, then this small volume must
be subject to vacuum as well. However,
the filter cavity is full of oil. Therefore, be
sure to use a flash tank in line with the
vacuum pump to make sure that oil, that
is pulled out of the filter cavity, does not
slug the vacuum pump.
Evaporator tube replacement
The units were designed for installation
of the tubes from the end of the evapora-
tor opposite the control panel end.
The following units will need to have the
circuit 2 control panel removed to re-
place tubes in the evaporator.
• 30' Base - 3 compressor units
• 36' Base - 3 compressor units
RTAC-SVX002A-EN