6
4. Installing the refrigerant piping
90°±0.5°
øA
R0.4~R0.8
A
45±2°
B
C
D
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
insulation materials (specific gravity of 0.03, thickness of 9 mm or more).
• Apply thin layer of refrigerant oil to pipe and joint seating surface before
tightening flare nut.
• Use two wrenches to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections.
Insulate carefully.
A
Flare cutting dimensions
Copper pipe O.D.
(mm)
Flare dimensions
øA dimensions (mm)
ø6.35
8.7 - 9.1
ø9.52
12.8 - 13.2
ø12.7
16.2 - 16.6
ø15.88
19.3 - 19.7
ø19.05
22.9 - 23.3
B
Refrigerant pipe sizes & Flare nut tightening torque
C
Do not apply refrigerating machine oil to the screw portions.
(This will make the flare nuts more apt to loosen.)
D
Be certain to use the flare nuts that are attached to the main unit.
(Use of commercially-available products may result in cracking.)
R407C or R22
R410A
Flare nut O.D.
Liquid pipe
Gas pipe
Liquid pipe
Gas pipe
Pipe size O.D.
(mm)
Tightening
torque.
(N·m)
Pipe size O.D.
(mm)
Tightening
torque.
(N·m)
Pipe size O.D.
(mm)
Tightening
torque.
(N·m)
Pipe size O.D.
(mm)
Tightening
torque.
(N·m)
Liquid
pipe
(mm)
Gas
pipe
(mm)
P32/40
ODø6.35 (1/4”)
14 - 18
ODø12.7 (1/2”)
49 - 61
ODø6.35 (1/
4
”)
14 - 1
8 O
Dø12.7 (1/2”)
4
9 - 61
17 26
P50
ODø9.52 (3/8”)
14 - 18*
ODø
15.88
(
5/8
”)
49
-
61
*
O
Dø
6.35
(
1/4") 14 - 18
ODø
12.7
(
1/2") 49 - 61 17 26
* Connect the joint with the following pipes: Liquid and gas pipes of P50.
E
Apply refrigerating machine oil over the entire flare seat surface.
Fig. 4-2
D
F
F
G
E
(
A
)
(
B
)
(
C
)
PKFY-P·VHM-E
4.2. Positioning refrigerant and drain piping (Fig. 4-2)
PKFY-P·VHM-E
A
Gas pipe
* Indicates the condition with accessories mounted.
B
Liquid pipe
C
Drain hose
D
Left-side piping knockout hole
E
Right-side piping knockout hole
F
Lower piping knockout hole
G
Mount board
1
