Refrigerant Pipe; Refrigerant Piping - Mitsubishi Electric City Multi PFFY-P VKM-E Seire Manuel D'installation

3. Installing the indoor unit
2)
150
168
3)
60
Fig. 3-9

4. Refrigerant pipe

A
45°±2°
Fig. 4-1
Refrigerant pipe sizes & Flare nut tightening torque
B
Liquid pipe
Pipe size
(mm)
P20/25/32/40 O.D. ø6.35 (1/4")
Apply refrigerating machine oil over the entire flare seat surface.
C
* Do not apply refrigerating machine oil to the screw portions. (This will make the flare nuts more apt to loosen.)
Be certain to use the flare nuts those are attached to the main unit. (Use of commercially-available products may result in cracking.)
D
4
(mm)
61
31
75
62
700
Fig. 3-8
4)
60
Fig. 3-10
B
C
D
R407C or R22
Gas pipe
Tightening Tightening
Pipe size
torque torque
(mm)
(N·m) (N·m)
14 - 18 O.D. ø12.7 (1/2") 49 - 61
Fig. 4-2
2) For right downward or left downward piping (Fig. 3-8)
(The following figure is a view of the bottom of the indoor unit from above.)
When the unit is installed on the wall.
A
When the unit is installed on the floor.
B
3) For left piping (Fig. 3-9)
4) For right piping (Fig. 3-10)
3.4.3. Sealing the holes
Use putty or a caulking compound to seal the holes.
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 tighten-
ing flare nut.
• Use two wrenches to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections.
Insulate carefully.
Warning:
When installing the unit, securely connect the refrigerant pipes before start-
ing the compressor.
Flare cutting dimensions
A
Copper pipe O.D.
(mm)
ø6.35
ø9.52
ø12.7
ø15.88
ø19.05
R410A
Liquid pipe
Tightening
Pipe size Pipe size
torque
(mm) (mm)
(N·m)
O.D. ø6.35 (1/4") 14 - 18 O.D. ø12.7 (1/2")

4.2. Refrigerant piping

4.2.1. Connecting pipe installation
Install the connecting pipes so that the piping can move slightly to the front, back,
left, and right. (Fig. 4-2)
Flare dimensions
øA dimensions (mm)
8.7 - 9.1
12.8 - 13.2
16.2 - 16.6
19.3 - 19.7
23.6 - 24.0
Flare nut O.D.
Gas pipe
Tightening
Liquid pipe Gas pipe
torque
(mm)
(N·m)
49 - 61 17
(mm)
26