Panasonic CS-ME9PB4EA, Руководство по обслуживанию

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POSITIONS OF AIR CONDITIONER BODY AND CEILING SURFACE
11.4 REFRIGERANT PIPING
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Refrigerant is charged to the outdoor unit. For
details, see the manual for installation work of
outdoor unit. (Additional charging, etc.)
1 Brazing for piping.
o
Execute brazing before tightening the
flare nut.
o
Brazing must be executed while blowing
nitrogen gas.
(This prevents generation of oxidized
scale in copper pipe.)
2 When there is a lot of brazings for long piping,
install a strainer midway of the piping. (The
strainer is locally supplied.)
3 Use clean copper pipe with inner wall surface
free from mist and dust. Blow nitrogen gas or
air to blow off dust in the pipe before
connection.
4 Form the piping according to its routing. Avoid
bending and bending back the same piping
point more than three times.
(This will result in hardening of the pipe).
5 After deforming the pipe, align centers of the
union fitting of the indoor unit and the piping,
and tighten them firmly with wrenches.
6 Connect pipe to the service valve or ball valve
which is located below the outdoor unit.
7 After completed the piping connection, be
sure to check if there is gas leakage in indoor
and outdoor connection.
Vacuum drying
After completing the piping connection, execute vacuum drying for the connecting piping and the indoor unit.
The vacuum drying must be carried out by using the service ports of both the liquid and gas side valves.
CAUTION Use two wrenches and tighten with regular torque.
Flare nut fastening torque N•m (kgf•cm)
ø6.35 mm 18 (180) ø12.7 mm 55 (560) ø19.05 mm 100 (1020)
ø 9.52 mm 42 (430) ø15.88 mm 65 (660)
Liquid size piping Gas side piping
ø6.35 mm (1/4”) ø 12.7 mm (1/2”)