En-6
4.3.3. Pipe connection
CAUTION
Be sure to install the pipe against the port on the indoor unit correctly. If the centering
is improper, the flare nut cannot tighten smoothly. If the flare nut is forced to turn, the
threads will be damaged.
Do not remove the flare nut from the indoor unit pipe until immediately before connect-
ing the connection pipe.
Hold the torque wrench at its grip, keeping at the right angle with the pipe, in order to
tighten the flare nut correctly.
Tighten the flare nuts with a torque wrench using the specified tightening method. Other-
wise, the flare nuts could break after a prolonged period, causing refrigerant to leak and
generate hazardous gas if the refrigerant comes into contact with a flame.
When the flare nut is tightened
properly by your hand, hold the body
side coupling with a separate spanner,
then tighten with a torque wrench.
(See the table below for the flare nut
tightening torques.)
Tighten with
2 wrenches.
Holding
wrench
Flare nut
Connection pipe
Torque wrench
Indoor unit pipe
(body side)
Flare nut [in (mm)]
Tightening torque [lbf·ft (N·m)]
1/4 (6.35) dia.
11.8 to 13.3 (16 to 18)
3/8 (9.52) dia.
23.6 to 31.0 (32 to 42)
1/2 (12.70) dia.
36.1 to 45.0 (49 to 61)
5/8 (15.88) dia.
46.5 to 55.3 (63 to 75)
3/4 (19.05) dia.
66.4 to 81.1 (90 to 110)
4.4. Installing heat insulation
Install the heat insulation material after performing a refrigerant leak check (see the Instal-
lation Manual for the outdoor unit for details).
4.4.1. Coupler heat insulation
• Insulate by the coupler heat insulation
(accessories) around the gas pipe and
liquid pipe of indoor side.
• After installing the coupler heat insula-
tion, wrap both end with vinyl tape so
that there is no gap.
• After affixing the coupler heat insula-
tion, secure it with 2 cable ties (large),
one on each end of the insulation.
• Make sure that the cable ties overlap
the heat insulation pipe.
Coupler heat
insulation
(accessories)
Cover this portion with
heat insulation.
cable tie (large)
(accessories)
Heat insulation
CAUTION
After checking for gas leaks (refer to the Installation Manual of the outdoor unit), per-
form this section.
Install heat insulation around both the large (gas) and small (liquid) pipes. Failure to do
so may cause water leaks.
5. INSTALLING DRAIN PIPES
Use general hard polyvinyl chloride pipe and connect it with adhesive (polyvinyl chloride)
so that there is no leakage.
Always heat insulate the indoor side of the drain hose.
Use a drain hose that matches the size of the drain pipe.
• Do not perform a rise, trap and air bleeding.
• Provide a downward gradient (1/100 or more).
• Provide supporters when long pipes are installed.
• Use an insulation material as needed, to prevent the pipes from freezing.
• Install the pipes in a way that allows for the removal of the control box.
(Right side)
Unit: in (mm)
Liquid pipe
Drain port
Gas pipe
9-7/16 (240)
1-1/4 (32)
2-5/8 (66)
4-1/2 (1
14)
(Left side) Unit: in (mm)
Drain port
The drain cap is attached at
the factory setting.
1-1/4 (32)
9-7/16 (240)
Pipe size
Drain pipe
Φ 3/4 in (19 mm) [I.D.],
Φ 1-1/16 in (27 mm) [O.D.]
• When the unit is shipped from the factory, the drain port is on the right side (control box
side).
• When using the drain port on the left side of the unit, reinstall the drain cap to the right
side drain port.
Drain port
Drain cap
Cable tie (large)
(accessories)
• Cover the drain cap with the drain hose insulation.
Drain hose insulation (accessories)
Unit
Unit
Drain hose insula-
tion (accessories)
Drain cap
0 in (0 mm)
Install the drain hose
Working procedure
(1) Install the attached drain
hose to the drain port of the
body. Install the hose band
from the top of the hose
within the graphic display
area. Secure firmly with the
hose band.
Ensure there is no space
Hose band
(accessories)
Soft PVC side
Drain hose
(accessories)
Drain pan
3/8 to 9/16
(10 to 15)
Unit: in (mm)
(2) Use vinyl adhesive agent to
glue the drain piping (PVC pipe)
[Φ 3/4 in (19 mm) I.D. Φ 1-1/16
in (27 mm) O.D.] which is pre-
pared on site or socket. (Apply
color adhesive agent evenly
until the gauge line and seal)
Hard PVC
side
Applying
area of
adhesive
Joint pipe
(locally purchased)
Drain pipe (locally
purchased)
Φ 3/4 (19) [I.D.],
Φ 1-1/16 (27) [O.D.]
0.16 (4) or less
Unit: in (mm)
(3) Check the drainage.
(4) Install the heat insulation.
(5) Use the attached heat insulation to insulate the drain port and band parts of the
body.
Wrap the Drain hose insulation around
the drain hose connection.
Drain pan
Drain hose
3-15/16
(100)
Drain hose insula-
tion (accessories)
Unit: in (mm)
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