Panasonic S-22KA1E5S Service Manual page 141

INSTALLATION OF DUCT
1. There are three ways to install the duct for the air inlet as shown below; (a) ~ (c).
2. The bottom of the panel can be converted into an air inlet [as the case of diagram (c)] as shown below;
11.10.4 REFRIGERANT PIPING
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.
a. Execute brazing before tightening the flare nut.
b. 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.
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)
ø6.35mm 18 (180)
ø9.52mm 42 (430)
ø12.7mm 55 (560)
ø15.88mm 65 (660)
7. After completed the piping connection, be sure to
check if there is gas leakage in indoor and
outdoor connection.
•
Confirm the round mark of the union (thin side) is
always at lower direction after connecting piping.
Cooling capacity
2.2kW - 6.3kW
7.1kW or more
141
Union
round mark
Liquid piping Gas piping
ø6.35mm ø12.7mm
ø9.52mm ø15.88mm