En-5
Pipe
Die
Check if [L] is flared uniformly and
is not cracked or scratched.
Pipe outside diameter
[in (mm)]
Dimension A [in (mm)]
Dimension B
0 (0)
-0.015 (-0.4)
[in (mm)]
Flare tool for R410A,
clutch type
1/4 (6.35)
0 to 0.020
(0 to 0.5)
3/8 (9.1)
3/8 (9.52)
1/2 (13.2)
1/2 (12.70)
5/8 (16.6)
5/8 (15.88)
3/4 (19.7)
3/4 (19.05)
15/16 (24.0)
When using conventional (R22) flare tools to flare R410A pipes, the dimension A should
be approximately 0.020 in (0.5 mm) more than indicated in the table (for flaring with
R410A flare tools) to achieve the specified flaring. Use a thickness gauge to measure the
dimension A. It is recommended that a R410A flaring tool is used.
Width across
flats
Pipe outside diameter [in (mm)]
Width across flats of Flare
nut [in (mm)]
1/4 (6.35)
11/16 (17)
3/8 (9.52)
7/8 (22)
1/2 (12.70)
1 (26)
5/8 (15.88)
1-1/8 (29)
3/4 (19.05)
1-7/16 (36)
4.3.2. Bending pipes
• If pipes are shaped by hand, be careful not to collapse them.
• Do not bend the pipes in an angle more than 90°.
• When pipes are repeatedly bent or stretched, the material will harden, making it difficult
to bend or stretch them anymore.
• Do not bend or stretch the pipes more than 3 times.
CAUTION
To prevent breaking of the pipe, avoid sharp bends.
If the pipe is bent repeatedly at the same place, it will break.
4.3.3. Pipe connection
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.)
Connection pipe
Flare nut
Tighten with 2
wrenches.
Torque
wrench
Indoor unit pipe
(body side)
Holding
wrench
CAUTION
Hold the torque wrench at its grip, keep-
ing it at a right angle with the pipe, in
order to tighten the flare nut correctly.
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).
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)
Cable tie (large)
(accessories)
Heat insulation
Heat insu-
lation
Cover this portion with
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
WARNING
Do not insert the drain piping into the sewer where sulfurous gas occurs. (Heat ex-
change erosion may occur)
Insulate the parts properly so that water will not drip from the connection parts.
Check for proper drainage after the construction by using the visible portion of transpar-
ent drain port and the drain piping final outlet on the body.
CAUTION
Do not apply adhesive agent on the drain port of the body. (Use the attached drain hose
and connect the drain piping)
• Install the drain pipe with downward gradient (1/100 to 1/50) and so there are no rises or
traps in the pipe. Unsmooth draining caused by accumulated water flow in the pipe may
cause clogged drain.
• Use general hard polyvinyl chloride pipe (Ø 3/4 in [I.D.]; Ø 1-1/16 in [O.D.]).
• When the pipe is long, install supporters.
• Do not perform air bleeding. Drainage may be blown out.
• Always heat insulate the indoor side of the drain pipe.
• If it is impossible to have sufficient gradient of pipe, perform drain lift-up.
Pipe size
Drain pipe
Ø 3/4 in [I.D.]; Ø 1-1/16 in [O.D.]
Hanging
fi
ttings
Ø 3/4 in [I.D.]; Ø 1-1/16 in [O.D.]
Downward gradient 1/100 to 1/50
60 to 78 in (1.5 to 2.0 m)
Rise
PROHIBITED:
Trap
Air bleeding
When lifting up drain:
• Height of inclined pipe should be less than 27 in (700 mm) from the ceiling. A rise dimen-
sion over this range will cause leakage.
• Lift up the pipe vertically at the position of 11 in (300 mm) or less from the unit.
Ø 3/4 in [I.D.];
Ø 1-1/16 in [O.D.]
local arrangement
Ø 1 in [I.D.]; Ø 1-5/16 in [O.D.] or more
Downward gradient 1/100 to 1/50
Downward gradient
1/100 to 1/50
11 in (300 mm)
or less
27 in (700 mm)
or less
27 in (700 mm)
or less
Horizontal or
upward gradient
9371022659-02_L3.indb Sec1:5
9371022659-02_L3.indb Sec1:5
9/24/2019 11:10:54 AM
9/24/2019 11:10:54 AM
