5
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.
A
Flare cutting dimensions
B
Flare nut tightening torque
90
°
±
0.5
°
ø
A
R0.4~R0.8
A
45
°±
2
°
B
C
D
Fig. 4-1
4.2. Indoor unit (Fig. 4-2)
Installing procedures
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
E
Pipe cover
3
B
Liquid tubing
F
Press the pipe cover against the sheet metal.
C
Band
4
G
Refrigerant tubing heat insulating material
D
Pipe cover
2
4. Installing the refrigerant piping
G
C
DE
A
B
D
E
F
C
Fig. 4-2
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
23.6 - 24.0
Copper pipe O.D.
Flare nut O.D.
Tightening torque
(mm)
(mm)
(N·m)
ø6.35
17
14 - 18
ø6.35
22
34 - 42
ø9.52
22
34 - 42
ø12.7
26
49 - 61
ø12.7
29
68 - 82
ø15.88
29
68 - 82
ø15.88
36
100 - 120
ø19.05
36
100 - 120
*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.
C
Apply refrigerating machine oil over the entire flare seat surface.
D
Use the flare nuts as follows.
Indoor unit
RP1.6, 2
RP2.5, 3
RP4-6
Refrigerant
R407C
Joint outdoor unit
PU(H)-P1.6/2 PU(H)-P2.5/3 PU(H)-P4/5/6
Gas side
Pipe size (mm)
ø15.88
ø15.88
ø19.05
Indoor nut
*1
*1
*1
Outdoor nut
*1
*1
*1
Liquid side
Pipe size (mm)
ø9.52
ø9.52
ø9.52
Indoor nut
*1
*1
*1
Outdoor nut
*1
*1
*1
Indoor unit
RP1.6, 2
RP2.5, 3
RP4-6
Refrigerant
R410A
Joint outdoor unit
PUHZ-RP1.6/2 PUHZ-RP2.5/3 PUHZ-RP4/5/6
Gas side
Pipe size (mm)
ø12.7
ø15.88
ø15.88
Indoor nut
*2
*1
*2
Outdoor nut
*1
*1
*1
Liquid side
Pipe size (mm)
ø6.35
ø9.52
ø9.52
Indoor nut
*2
*1
*1
Outdoor nut
*1
*1
*1
4.3. For twin/triple combination
Refer to the outdoor unit installation manual.
5. Drainage piping work
B
A
Fig. 5-1
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.
A
Drain pan
B
Plug
