Installing The Refrigerant Piping - Mitsubishi Electric PKA-RP-FAL Installation Manual

3. Installing the indoor unit
1
A
E
3
Fig. 3-11

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
1
E
25 B
Fig. 4-2
2
F G
30
37
74
Fig. 4-3
3
J
M
Fig. 4-4
B
B
C
D
8.7 - 9.1
C
D
D
55
B
120
1110 183
C
B
H I
39
98 32
37
74
340
L
3.4. Mounting the indoor unit (Fig. 3-11)
1 Make sure to hang the metal catches of the indoor unit over the hooks of the wall
mounting fixture.
2 When the piping has been completed, use the securing screws to fix the indoor
unit on the wall mounting fixture.
Note:
Check that the catches of the indoor unit securely fit over the hooks of the wall
mounting fixture.
2
D
3 The screw indicated by the bold arrow is used only during transportation and
C
should be removed. Remove the screw before installation if there is not enough
space at the left side to remove it once the unit has been installed.
A Indoor unit
B Wall fixing bracket 1
C Hook
D Metal catch of the indoor unit
E Securing screws
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
ø9.52
ø12.7
ø15.88
ø15.88
C Apply refrigerating machine oil over the entire flare seat surface.
D Use the flare nuts as follows.
Indoor unit (Liquid)
Indoor unit (Gas)
Outdoor unit (Liquid)
Outdoor unit (Gas)
A
* In case that the flare nut attached to indoor gas valve is used, gas leakage or even
111
pipe extraction will occur.
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
30
could be damaged.
3 L-shaped connection pipe (for gas piping) (Fig. 4-4)
A 107 mm (RP2.5, 3), 102 mm (RP4)
B Drain hose
C Liquid pipe
D Gas pipe
E Drain hose in left-side piping
F Knockout holes on the unit body
K
G For left-side piping
J
Flare nut O.D. Tightening torque
(mm)
17
22
26
29
36 100 - 120
RP2.5, 3
Flare nut attached to Flare nut attached to
indoor liquid valve indoor liquid valve
Flare nut attached to * Flare nut in outdoor
indoor gas valve unit accessories
Flare nut attached to Flare nut attached to
outdoor liquid valve outdoor liquid valve
Flare nut attached to Flare nut attached to
outdoor gas valve outdoor gas valve
H For lower-side piping
I For right-side piping
J L-shaped connection pipe (option)
K Unit side
L On-site piping side
M Piping
(N·m)
14 - 18
34 - 42
49 - 61
68 - 82
RP4
5