87
Drain cap
Drain hose
Adjustthe piping slightlydownwards.
How to pull the piping and drain hose out, in case of the embedded piping
.
PVC tube
for drain
hose
Indoor unit
72 mm
Piping
Cable
Apply putty or
caulking material
to seal the wall
opening.
Connectin g
cable
Piping
M
o
r
e
t
h
a
n
4
7
0
m
m
M
o
r
e
t
h
a
n
1
1
5
0
m
m
PVC tube (VP-65) for piping
and connecting cable
PVC tube for drain hose (VP-30)
PVC tube for
drain hose (VP-20)
More than 700 mm
In case of left piping how to insert the
connecting cable and drain hose.
Cable
4
5
°
Drain
hose
Piping
Drain hose
from main unit
(For the right piping, follow the same procedure)
Sleeve for piping hole
Drain hose
Piping
Connecting
cable
More than 1150 mm
Rear view forleft piping installation
Replace the drain hose
Connecting cable
Drain hose
11.4.4 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.
7. After completed the piping connection, be sure to
check if there is gas leakage in indoor and outdoor
connection.
Union
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) Cooling capacity Liquid piping Gas side piping
ø6.35mm 18 (180) ø12.7mm 55 (560) 2.2kW - 6.3kW ø6.35mm ø12.7mm
ø9.52mm 42 (430) ø15.88mm 65 (660) 7.1kW or more ø9.52mm ø15.88mm
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