5
4. Refrigerant pipe
90
°
±
0.5
°
ø
A
R0.4~R0.8
A
45
°±
2
°
B
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 insu-
lation 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. Insu-
late carefully.
C
B
A
Flare cutting dimensions
Copper pipe O.D.
Flare dimensions
(mm)
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
C
Apply refrigerating machine oil over the entire flare seat surface.
B
Refrigerant pipe sizes & Flare nut tightening torque
* Use the provided flare nut for the following pipes: Liquid pipe of P50, gas pipe of P50, P100, and P125.
P20/25/32/40
P50
P63/80
P100/125
Flare nut O.D.
Liquid
Gas
pipe
pipe
(mm)
(mm)
17
26
22
29
22
29
22
36
R410A
Liquid pipe
Gas pipe
Tightening
Tightening
Pipe size
torque
Pipe size
torque
(mm)
(N.m)
(mm)
(N.m)
ODø6.35 (1/4”)
14 - 18
ODø12.7 (1/2”)
49 - 61
ODø6.35 (1/4”)
34 - 42
ODø12.7 (1/2”)
68 - 82
ODø9.52 (3/8”)
34 - 42
ODø15.88 (5/8”)
68 - 82
ODø9.52 (3/8”)
34 - 42
ODø15.88 (5/8”)
100 - 120
R407C or R22
Liquid pipe
Gas pipe
Tightening
Tightening
Pipe size
torque
Pipe size
torque
(mm)
(N.m)
(mm)
(N.m)
ODø6.35 (1/4”)
14 - 18
ODø12.7 (1/2”)
49 - 61
ODø9.52 (3/8”)
34 - 42*
ODø15.88 (5/8”)
68 - 82*
ODø9.52 (3/8”)
34 - 42
ODø15.88 (5/8”)
68 - 82
ODø9.52 (3/8”)
34 - 42
ODø19.05 (3/4”)
100 - 120*
4.2. Positioning refrigerant and drain piping
1
Position of refrigerant and drain piping (Fig. 4-2)
2
Determine the position of the knockout holes on the unit body (Fig. 4-3)
• Make the knockout holes using a saw blade or an adequate knife.
Caution:
The side panel must be removed before drilling a knockout hole in it.
If a hole is made with the side panel in place, the refrigerant pipe within the unit
could be damaged.
3
L-shaped connection pipe (for gas piping) (Fig. 4-4)
A
107 mm (P63), 102 mm (P100)
H
For lower-side piping
B
Drain hose
I
For right-side piping
C
Liquid pipe
J
L-shaped connection pipe (option)
D
Gas pipe
K
Unit side
E
Drain hose in left-side piping
L
On-site piping side
F
Knockout holes on the unit body
M
Piping
G
For left-side piping
4.3. Refrigerant piping (Fig. 4-5)
1) Indoor unit
Caution:
Before connecting right, lower, left or left rear piping, connect the supplied L-
shaped connection pipe
B
to the on-site piping.
Liquid pipe
Gas pipe
Insulation material
3
Band (large)
4
Band (small)
4
Band (small)
4
Tape
Thermal insulating
material for
refrigerant piping
Thermal insulating
material for liquid pipe
Liquid pipe
Fig. 4-5
25
1110
183
120
55
42
58
111
C
D
A
D
C
B
B
B
E
1
Fig. 4-2
2
30
37
74
100
39
4
30
37
74
39
98
32
37
65
100
39
4
G
F
H
I
3
Fig. 4-3
Fig. 4-4
J
M
K
J
L
340
80
Summary of Contents for PKFY-P VFM-E
Page 79: ......
