En-8
Tighten with 2 wrenches.
Holding wrench
Flare nut
Connection pipe
Torque wrench
Indoor unit pipe
(Body side)
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)
4.4. Installing heat insulation
Install the heat insulation material after performing a refrigerant leak check (see the In-
stallation 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 insulation, wrap both end with vinyl tape so that there
is no gap.
• After affi xing the coupler heat insulation, 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),
perform 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
exchange 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
transparent drain port and the drain piping fi nal 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.)
5.1. When drain pump is used
• Use general hard polyvinyl chloride pipe (VP25) [outside diameter 32 mm].
• 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.
Gap of 1.5 to 2 m
700 mm or less
Horizontal or
upward gradient
Supporter
Max. 300 mm
Locally arranged pipe
GOOD
VP25 [O.D
32 mm or more]
Rise
Air bleeding
PROHIBITED
Trap
Observe the following procedures to construct centralized drain pipe fi ttings.
VP30 or more [O.D 38 mm or more]
Downward gradient 1/100 or more
700 mm or less
5.2. When drain pump is not used (Natural drainage)
CAUTION
Set “7.4. Switching of drainage function”
Drain pump cannot be used if it is installed in wall mounted type/floor standing
concealed type.
If the drain pump is not used, please replace with the drain cap.
Wall mounted type /
Floor standing concealed type
Ceiling concealed type
• Use general hard polyvinyl chloride pipe (VP25) [outside diameter 32 mm].
• 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.
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