10.10 Replacing the return oil circuit
D A N G E R
• Turn OFF all the power source switches.
1 Remove the front service cover as described in the procedure
Removing the front service cover, see on page 292.
2 Remove
the
electrical box, wiring and electrical box stay as
described in the procedures Removing the electrical box for
RAS-(8-12)FSXN, see on page 295 and Removing the
electrical box for RAS-(14-18)FSXN, see on page 295,
Removing the electrical box stay for RAS-(8-12)FSXN, see on
page 296 and Removing the electrical box stay for RAS-
(14-18)FSXN, see on page 296.
3 Close the following stop valves.
a Heat pump system: Close the high pressure gas stop valve
-A- and the liquid stop valve -C-.
b Heat recovery system: Close the high pressure gas stop
valve, the low pressure gas stop valve -B- and the liquid
stop valve -C-.
4 Collect the outdoor unit refrigerant from the low pressure check
joint -D- and the high pressure check joint -E-. Make sure that
the pressure will not increase at this time.
N O T E
If the pressure increases, collect all the refrigerant in the refrigerant circuit.
5 Remove the flare nut from the upper part of the return oil circuit -G-.
6 Remove the return oil circuit and the flare nut of the oil separator outlet port -F-.
N O T E
• When
the
flare nut of the oil separator outlet port -F- and the flare nut of the upper part of the return oil
circuit -G- are removed, the refrigerant oil can overflow. Prepare an oil pan to collect the refrigerant oil before
removing.
• H: Oil separator.
F
F
G
G
H
H
RAS - (8-12) FSXN RAS - (14-18) FSXN
7 Fit the return oil pipe to replace it. After replacing charge with nitrogen from the low pressure check joint -D- by applying
pressure. Check that there is no leakage in the connection of the flare nut.
8 Perform vacuuming and charge refrigerant. After charging the refrigerant, open the stop valves.
10 Servicing
311
SMGB0065 rev. 1 - 12/2010
10
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