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41 21 21
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 bend or stretched, the material will harden, making it difficult
to bend or stretch them any more.
•
Do not bend or stretch the pipes more than 3 times.
To prevent breaking of the pipe, avoid sharp bends.
If the pipe is bent repeatedly at the same place, it will break.
41 21 21
Pipe connection
Be sure to apply the pipe against the port on the indoor unit correctly. If the centering
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
connecting the connection pipe.
Do not use mineral oil on flared part. Prevent mineral oil from getting into the system
as this would reduce the lifetime of the units.
(1)
Detach the caps and plugs from the pipes.
(2)
Centering the pipe against port on the indoor unit, turn the flare nut with your hand.
Flare nut
(3)
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.)
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 a hazardous gas if the refrigerant comes into contact with a flame.
Torque wrench
Indoor unit pipe
(Body side)
Flare nut [mm (in.)]
6.35 (1/4) dia.
9.52 (3/8) dia.
12.70 (1/2) dia.
15.88 (5/8) dia.
19.05 (3/4) dia.
En-5
CAUTION
CAUTION
Flare nut
Connection pipe
(large)
Connection pipe
(small)
CAUTION
Tighten with 2 wrenches.
Holding Wrench
Flare nut
Connection pipe
Tightening torque [N·m (kgf·cm)]
16 to 18 (160 to 180)
32 to 42 (320 to 420)
49 to 61 (490 to 610)
63 to 75 (630 to 750)
90 to 110 (900 to 1,100)
41 41
Installing heat insulation
Install the heat insulation material after performing a refrigerant leak check (see the
Installation Manual for the outdoor unit for details).
41 41 11
COUPLER HEAT INSULATION
•
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 affi 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.
Coupler heat
insulation
(Accessories)
Cable tie (Large)
(Accessories)
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.
51
INSTALLING DRAIN PIPES
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 figure 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 figure.
Flange positions for connecting the drain pipes
Safty drain port
Φ25.4 (O.D.)
Cover this portion with
heat insulation.
Heat insulation
CAUTION
CAUTION
29
148
Main drain port
Φ25.4 (O.D.)
Unit : mm
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