En-5
Bending pipes4. 3. 2.
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 bend or stretched, the material will harden, making it difcult •
to bend or stretch them any more.
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.
Pipe connection4. 3. 3.
CAUTION
Be sure to apply the pipe against the port on the indoor unit correctly. If the centering
is improper, the are nut cannot be tightened smoothly. If the are nut is forced to turn,
the threads will be damaged.
Do not remove the are nut from the indoor unit pipe until immediately before
connecting the connection pipe.
Do not use mineral oil on ared part. Prevent mineral oil from getting into the system
as this would reduce the lifetime of the units.
Detach the caps and plugs from the pipes.(1)
Centering the pipe against port on the indoor unit, turn the are nut with your hand.(2)
Connection pipe
(small)
Flare nut
Flare nut
Connection pipe
(large)
When the are nut is tightened properly by your hand, hold the body side coupling with (3)
a separate spanner, then tighten with a torque wrench. (See the table below for the
are nut tightening torques.)
CAUTION
Hold the torque wrench at its grip, keeping it in the right angle with the pipe, in order to
tighten the are nut correctly.
Tighten the are nuts with a torque wrench using the specied tightening method.
Otherwise, the are nuts could break after a prolonged period, causing refrigerant to
leak and generate a hazardous gas if the refrigerant comes into contact with a ame.
Tighten with 2 wrenches.
Connection pipe
Torque wrench
Indoor unit pipe
(Body side)
Flare nut
Holding Wrench
Flare nut [mm (in.)] Tightening torque [N·m (kgf·cm)]
6.35 (1/4) dia. 16 to 18 (160 to 180)
9.52 (3/8) dia. 32 to 42 (320 to 420)
12.70 (1/2) dia. 49 to 61 (490 to 610)
15.88 (5/8) dia. 63 to 75 (630 to 750)
19.05 (3/4) dia. 90 to 110 (900 to 1,100)
Installing heat insulation4. 4.
Install the heat insulation material after performing a refrigerant leak check (see the
Installation Manual for the outdoor unit for details).
COUPLER HEAT INSULATION4. 4. 1.
Insulate with the coupler heat insulation (Accessories) around the gas pipe and liquid pipe •
at indoor unit.
After installing the coupler heat insulation, wrap both ends with vinyl tape so that there is •
no gap.
After af xing the coupler heat insulation, secure it with 2 cable tie (large), one on each •
end of the insulation.
Make sure that the cable tie overlap the heat insulation pipe.•
Heat insulation
Coupler heat
insulation
(Accessories)
Cover this portion with
heat insulation.
Cable tie (Large)
(Accessories)
CAUTION
After checking for gas leaks (refer to the Installation Manual of the outdoor unit),
perform this section.
Install heat insulation around both the large (gas) and small (liquid) pipes. Failure to
do so may cause water leaks.
INSTALLING DRAIN PIPES5.
CAUTION
Install the drain pipe in accordance with the instructions in this Installation Manual and
keep the area warm enough to prevent condensation. Problems with the piping may
lead to water leaks.
This UNIT has drain ports in 2 locations. Follow the procedure in the gure to connect
drain pipes to each of them.
Be sure to properly insulate the drain pipes.
The position of the installed drain pipe should have a downward gradient of 1/100 or
more.
Do not connect the drain pipe in which ammonia or other types of gas affecting the
unit is generated.
Install the drain pipes according to the measurements given in the following gure.
Flange positions for connecting the drain pipes
Safty drain port
Φ25.4 (O.D.)
Main drain port
Φ25.4 (O.D.)
Unit : mm
29
148
382
400
9380441038_IM.indb 5 28/1/2556 13:44:36
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