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4. Installing the refrigerant piping
A
45°±2°
Fig. 4-1
A Flare cutting dimensions
Copper pipe O.D.
Flare dimensions
(mm)
øA dimensions (mm)
ø6.35
ø9.52
12.8 - 13.2
ø12.7
16.2 - 16.6
ø15.88
19.3 - 19.7
ø19.05
23.6 - 24.0
C
DE
G
Fig. 4-2
5. Drainage piping work
A
Fig. 5-1
B
C
D
8.7 - 9.1
A
C
D
E
F
A Drain pan
B Plug
B
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.
B Flare nut tightening torque
Copper pipe O.D.
(mm)
ø6.35
ø6.35
ø9.52
ø12.7
ø12.7
ø15.88
ø15.88
ø19.05
C Apply refrigerating machine oil over the entire flare seat surface.
D Use the flare nuts as follows.
Indoor unit
Refrigerant
Joint outdoor unit
Gas side
Pipe size (mm)
Indoor nut
Outdoor nut
Liquid side
Pipe size (mm)
Indoor nut
Outdoor nut
Indoor unit
Refrigerant
Joint outdoor unit
Gas side
Pipe size (mm)
Indoor nut
Outdoor nut
Liquid side
Pipe size (mm)
Indoor nut
Outdoor nut
*1: The flare nut is attached to its pipe.
*2: The flare nut is in the outdoor unit accessory.
Do not use the flare nut attached. If it is used, a gas leakage or even a pipe
extraction may occur.
Refer to the outdoor unit installation manual for the specification of connecting pipes.
4.2. Indoor unit (Fig. 4-2)
Installing procedures
B
1. Slide the supplied pipe cover 2 over the gas tubing until it is pressed against the
sheet metal inside the unit.
2. Slide the provided pipe cover 3 over the liquid tubing until it is pressed against
the sheet metal inside the unit.
3. Tighten the pipe covers 2 and 3 at the both ends (15 - 20 mm) with the supplied
bands 4.
A Gas tubing
B Liquid tubing
C Band 4
D Pipe cover 2
4.3. For twin/triple combination
Refer to the outdoor unit installation manual.
5.1. Preparation for left side tubing installation (Fig. 5-1)
• For left side tubing, be sure to insert the rubber plug into the right drain port.
• Install the drain tubing as it slopes continuously downward.
• After completion of work, check that correct drain is available from the outflow port
of the drain tubing.
Flare nut O.D.
Tightening torque
(mm)
(N·m)
17
14 - 18
22
34 - 42
22
34 - 42
26
49 - 61
29
68 - 82
29
68 - 82
36
100 - 120
36
100 - 120
RP1.6, 2
RP2.5, 3
R407C
PU(H)-P1.6/2 PU(H)-P2.5/3 PU(H)-P4/5/6
ø15.88
ø15.88
*1
*1
*1
*1
ø9.52
ø9.52
*1
*1
*1
*1
RP1.6, 2
RP2.5, 3
R410A
PUHZ-RP1.6/2 PUHZ-RP2.5/3 PUHZ-RP4/5/6
ø12.7
ø15.88
*2
*1
*1
*1
ø6.35
ø9.52
*2
*1
*1
*1
E Pipe cover 3
F Press the pipe cover against the sheet metal.
G Refrigerant tubing heat insulating material
RP4-6
ø19.05
*1
*1
ø9.52
*1
*1
RP4-6
ø15.88
*2
*1
ø9.52
*1
*1
5
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