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En-6
5) Use the attached heat insulation to insulate the drain port and hose band.
Install the knob facing upward
Attach hose band
(Accessories)
Locally installed
PCV pipe
Attach drain hose
(Accessories)
Attach heat insulation
(Accessories)
・
(a) Top view
(c) Hose opening view
Top view
(b) Side view
Hose band
Applying area of
adhesive 1-3/8 (35)
Gauge line
3/16 (4) or less
13/16 (20)
Transparent
visible portion
Make sure there
are no gaps
Wind the attached heat
insulation around the
hose band make sure
the alignment is on top
3/16 to 3/8 (5 to10)
13/16
(20)
[Unit: in (mm)]
3/4
(19)
NOTES:
Check for drainage
Pour about 1 liter of water from the position shown in the diagram or from the airflow outlet
to the dew tray. Check for any abnormalities such as strange noises and whether the drain
pump functions normally
The drain pump operates when operating in the cooling mode.
Drain pipe Wire cover
Screw
Watering pot
3.5. Pipe installation
CAUTION
• Tighten the flare nuts with a torque wrench using the specified tightening method.
Otherwise, 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.
• Be careful that foreign matter (oil, water, etc.) does not enter the piping with refrig-
erant R410A models. Also, when storing the piping, securely seal the openings by
pinching, taping, etc.
• While brazing the pipes, be sure to purge with dry nitrogen gas.
3.5.1. Pipe connection
■
Flaring
Use special pipe cutter and flare tool designed for R410A pipework.
(1) Cut the connection pipe to the necessary length with a pipe cutter.
(2) Hold the pipe downward so that cuttings will not enter the pipe and remove any burrs.
(3) Insert the flare nut (always use the flare nut attached to the indoor unit(s) and outdoor
unit or branch box respectively) onto the pipe and perform the flare processing with a
flare tool. Use the special R410A flare tool, or the conventional flare tool. Leakage of
refrigerant may result if other flare nuts are used.
(4) Protect the pipes by pinching them or with tape to prevent dust, dirt, or water from
entering the pipes.
Die
A
Pipe
B
L
Check if [L] is flared uniformly
and is not cracked or scratched.
Pipe outside diameter
[in (mm)]
Dimension A [in (mm)]
Dimension B [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 flare tools to flare R410A pipes, the dimension A should be ap-
proximately 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.
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)
■
Bending pipes
CAUTION
• To prevent breaking of the pipe, avoid sharp bends.
• If the pipe is bent repeatedly at the same place, it will break.
• The pipes are shaped by your hands. Be careful not to collapse them.
• Bend R 2-3/4 in (70 mm) or more with a pipe bender.
• Do not bend the pipes in an angle more than 90°.
• When pipes are repeatedly bend 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.
• When bending the pipe, do not bend it as
is. The pipe will be collapsed. In this case,
cut the insulating pipe with a sharp cutter
as shown on the right, and bend it after
exposing the pipe. After bending the pipe
as you want, be sure to put the heat insu-
lating pipe back on the pipe, and secure it
with tape.
Pipe
Insulating
pipe
Cutter
Cut line
■
Flare connection
CAUTION
• Be sure to install the pipe against the port on the indoor unit correctly. If the center-
ing is improper, the flare nut cannot be tightened 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 con-
necting the connection pipe.
• Hold the torque wrench at its grip, keeping it in 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.
Otherwise, 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.
• Connect the piping so that the control box cover can easily be removed for servic-
ing when necessary.
• In order to prevent water from leaking into the control box, make sure that the pip-
ing is well insulated.
• When flared joints are reused indoors, the flare part shall be re-fabricated.