Installing The Refrigerant Piping - Mitsubishi Electric city multi P40 Installationshandbuch

3. Installing the indoor unit
A
B
C
D
Fig. 3-6

4. Installing the refrigerant piping

A
45°±2°
Fig. 4-1
B Refrigerant pipe sizes & Flare nut tightening torque
Liquid pipe
Tightening
Pipe size
(mm)
ODø6.35 (1/4")
P20/25/32/40
ODø9.52 (3/8")
P50
P63/80 ODø9.52 (3/8")
ODø9.52 (3/8")
P100/125
* Use the provided flare nut for the following pipes: Liquid pipe of P50, P100, P125, and gas pipe of P50.
C
DE
G
Fig. 4-2
4
E
7–12
F
G
H
C
B
C
B
R407C or R22
Gas pipe
Tightening
Pipe size
torque torque
(mm)
(N.m) (N.m)
14 - 18 ODø12.7 (1/2") 49 - 61
34 - 42* ODø15.88 (5/8") 68 - 82*
34 - 42 ODø15.88 (5/8") 68 - 82
34 - 42 ODø19.05 (3/4") 100 - 120*
A
C
D
E
F
When embedding pipes, into the wall (Fig. 3-6)
2) Installing the suspending bracket first onto the ceiling
Installing procedures
1. Remove the suspending brackets, U-shaped washers, and suspending bracket
holding screws from the unit.
2. Adjust the suspending bracket holding bolts on the unit.
3. Attach the suspending brackets to the suspending bolts.
4. Set (hook) the unit to the suspending brackets.
∗ Be sure to install the U-shaped washers.
A Bolt
B Unit
C Washer
D Suspending bracket holding screw
E Bolt
F Washer 1
G Double nuts
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
insulation 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 tight-
ening flare nut.
• Use two wrenches to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections.
Insulate carefully.
A Flare cutting dimensions
Copper pipe O.D.
(mm)
ø6.35
ø9.52
ø12.7
ø15.88
ø19.05
R410A
Liquid pipe
Tightening
Pipe size
torque
(mm)
(N.m)
ODø6.35 (1/4") 14 - 18
ODø6.35 (1/4") 34 - 42
ODø9.52 (3/8") 34 - 42
ODø9.52 (3/8") 34 - 42
C Apply refrigerating machine oil over the entire flare seat surface.
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
B Liquid tubing
C Band 4
B
D Pipe cover 2
H P40
P63, P100
P125
Flare dimensions
øA dimensions (mm)
8.7 - 9.1
12.8 - 13.2
16.2 - 16.6
19.3 - 19.7
22.9 - 23.3
Gas pipe
Tightening
Liquid
Pipe size
torque
pipe
(mm)
(N.m) (mm)
ODø12.7 (1/2") 49 - 61
17
ODø12.7 (1/2") 68 - 82
22
ODø15.88 (5/8") 68 - 82 22
ODø15.88 (5/8") 100 - 120
22
E Pipe cover 3
F Press the pipe cover against the sheet metal.
G Refrigerant tubing heat insulating material
(mm)
900 - 905
1207 - 1212
1514 - 1519
Flare nut O.D.
Gas
pipe
(mm)
26
29
29
36