4
Fig. 3-6
Fig. 3-7
Fig. 3-8
3. Installing the indoor unit
4. Refrigerant pipe and drain pipe
90 ±0.5
øA
R0.4~R0.8
45 ±2
Fig. 4-1
4.1. Connecting pipes (Fig. 4-1)
• When commercially available copper pipes are used, wrap liquid and gas pipes
with commercially available insulation materials (heat-resistant to 100 °C or more,
thickness of 12 mm or more).
• The indoor parts of the drain pipe should be wrapped with polyethylene foam in-
sulation materials (specifi c gravity of 0.03, thickness of 9 mm or more).
• Apply thin layer of refrigerant oil to pipe and joint seating surface before tighten-
ing fl are nut.
• Use two wrenches to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections. In-
sulate carefully.
Flare cutting dimensions
Copper pipe O.D.
(mm)
Flare dimensions
øA dimensions (mm)
ø6.35
8.7 - 9.1
ø12.7
16.2 - 16.6
-
Lift the indoor unit by hooking the supporting piece (attached to the mount
board) to the ribs on the back of the unit as shown. (Fig. 3-6)
When piping work etc. is complete, replace the supporting piece on the
mount board.
(If the unit is not fi xed securely, vibration may occur during operation.)
Mount board
Supporting piece
Rib
If the fl are pipe is to be embedded into the wall in advance: (Fig. 3-7)
• Determine the length of pipe to be embedded by marking on the mounting plate
as a reference.
Mark
Wall mounting fi xture
3.3. Mounting the unit (Fig. 3-8)
Securely place the hanging fi xtures for the indoor unit over the catches on the
wall mounting fi xture.
Indoor unit
Wall mounting fi xture
Catch
When piping has been completed, install the indoor unit and wall mounting fi x-
ture with fi xing screws.
-
Refrigerant pipe sizes & Flare nut tightening torque
R407C or R22
R410A
Flare nut O.D.
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
Pipe size(mm)
Tighten-
ing torque
(N.m)
Pipe size (mm)
Tightening
torque
(N.m)
Pipe size (mm)
Tightening
torque
(N.m)
Pipe size (mm)
Tightening
torque
(N.m)
Liquid pipe
(mm)
Gas pipe
(mm)
P15/P20/25
ODø6.35 (1/4”)
14 - 18
ODø12.7 (1/2”)
49 - 61
ODø6.35 (1/4”)
14 - 18
ODø12.7 (1/2”)
49 - 61
17
26
Do not apply refrigerating machine oil to the screw portions.
(This will make the fl are nuts more apt to loosen.)
Be certain to use the fl are nuts that are attached to the main unit.
(Use of commercially-available products may result in cracking.)
Apply refrigerating machine oil over the entire fl are seat surface.
