Trane RTWB Helical-Rotary Installation Operation & Maintenance page 37

RTWB-SVN01B-E4
Periodic
Maintenance
To change the oil filter in the unit,
refer to Figure 14 and follow the
steps listed below.
For units without the discharge
valve option:
1. Shut off the compressor and
disconnect all electrical service
to the compressor.
2. Vacuum the refrigerant out of
the circuit.
3. Remove the seven bolts on the
oil filter cover. A pan may be
necessary to catch any oil that is
released after the cover is
loosened.
4. Remove the cover and the oil
filter element.
5. Install the new filter element.
6. Coat the new cover gasket with
refrigerant oil.
7. Install the cover plate and cover
plate gasket.
8. Install a new copper gasket
under the bolt head that had one
at time of removal. Replace all
other bolts and tighten to 89.5
Nm.
9. Vacuum the refrigerant circuit at
500 micron and isolate the
vacuum pump.
10. Confirm that no moisture or
leaks are present by letting the
vacuum stand for 2 hours. The
pressure should not raise more
than 250 microns.
11. Charge the unit with oil, in a
quantity equal to what has been
removed, by using the charging
valve placed on the oil filter.
Note: the oil is very sensitive to
moisture. Use the oil
immediately after the oil can has
been opened.
12. Charge the unit with refrigerant
R134a (refer to the charging
procedure)
37