Installing The Pipes; Refrigerant Piping Work - Mitsubishi Electric Mr.SLIM PLA-RP-AA Série Manuel D'installation

4. Installing the pipes

G
A
E D F
60 286 374
C
Fig. 4-1

5. Refrigerant piping work

A
45°±2°
Fig. 5-1
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
G
F
B,C
J
I
H
Fig. 5-2
A
Models
RP3 80
RP4, 5, 6 84
B
B
C
D
8.7 - 9.1
A Refrigerant pipe and insulating ma-
terial
A
B Pipe cover (large)
C Pipe cover (small)
D Refrigerant pipe (gas)
E Refrigerant pipe (liquid)
F Band
G Cross-sectional view of connection
H Pipe
I Insulating material
J Squeeze
D
B
E
C
F
4.1. Refrigerant and drainage piping locations of indoor
unit
The figure marked with * in the drawing represent the dimensions of the main unit
excluding those of the optional multi function casement. (Fig. 4-1)
A Drain pipe
B Ceiling
C Grille
D Refrigerant pipe (liquid)
E Refrigerant pipe (gas)
F Water supply inlet
(mm)
G Main unit
A
• When the optional multi-functional casement is installed, add 135 mm to the di-
mensions marked on the figure.
5.1. Connecting pipes (Fig. 5-1)
• 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)
* In case that the flare nut attached to indoor gas valve is used, gas leakage or even
pipe extraction will occur.
5.2. Indoor unit (Fig. 5-2)
Heat insulation for refrigerant pipes:
1 Wrap the enclosed large-sized pipe cover around the gas pipe, making sure that
the end of the pipe cover touches the side of the unit.
2 Wrap the enclosed small-sized pipe cover around the liquid pipe, making sure
that the end of the pipe cover touches the side of the unit.
3 Secure both ends of each pipe cover with the enclosed bands. (Attach the bands
20 mm from the ends of the pipe cover.)
• After connecting the refrigerant piping to the indoor unit, be sure to test the pipe
connections for gas leakage with nitrogen gas. (Check that there is no refrigerant
leakage from the refrigerant piping to the indoor unit.)
5.3. For twin/triple combination
Refer to the outdoor unit installation manual.
Flare nut O.D. Tightening torque
(mm)
17
22
26
29
36 100 - 120
RP3
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
(N·m)
14 - 18
34 - 42
49 - 61
68 - 82
RP4-6
5