RLC-SVX02G-E4
68
Maintenance Procedures
Filter Replacement
Procedure
Refrigerant Filter-Changing
Procedure
A dirty filter is indicated by a
temperature gradient across the
filter, corresponding to a pressure
drop. If the temperature
downstream of the filter is 8°F
[4.4°C] lower than the upstream
temperature, the filter should be
replaced. A temperature drop can
also indicate that the unit is
undercharged. Ensure proper
subcooling before taking
temperature readings.
1. With the unit off, verify that the
EXV is closed. Close the liquid-
line isolation valve.
2. Attach the vacuum hose to the
service port on the liquid-line
filter flange.
3. Evacuate the refrigerant from the
liquid-line and store.
4. Remove the vacuum hose.
5. Depress the Schrader valve to
equalize pressure in the liquid
line with atmospheric pressure.
6. Remove the bolts that retain the
filter flange.
7. Remove the old filter element.
8. Inspect the replacement filter
element and lubricate the o-ring
with Trane OIL 0048E.
Note: Do not use mineral oil. It
will contaminate the system.
9. Install the new filter element in
the filter housing.
10. Inspect the flange gasket and
replace it with a new one if
damaged.
11. Install the flange and torque the
bolts to 14-16 lb-ft [19-22 N-m].
12. Attach the vacuum hose and
evacuate the liquid line.
13. Remove the vacuum hose from
the liquid line and attach the
charging hose.
14. Replace the stored charge in the
liquid line.
15. Remove the charging hose.
16. Open the liquid-line isolation
valve.
Lubrication System
The lubrication system has been
designed to keep most of the oil
lines filled with oil as long as there
is a proper oil level in the oil sump.
The total oil charge can be removed
by draining the oil system, the oil
return line from the evaporator, the
evaporator, and the compressor.
Very small quantities of oil may be
found in other components.
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