Refrigerant Pipe; Refrigerant Piping - Mitsubishi Electric PFFY-P20VKM-E Installation Manual

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

4. Refrigerant pipe

A
45°±2°
Fig. 4-1
B
Refrigerant pipe sizes & Flare nut tightening torque
Liquid pipe
Pipe size
(mm)
P20/25/32/40 O.D. ø6.35 (1/4")
C
Apply refrigerating machine oil over the entire flare seat surface.
* Do not apply refrigerating machine oil to the screw portions. (This will make the flare nuts more apt to loosen.)
D Be certain to use the flare nuts those are attached to the main unit. (Use of commercially-available products may result in cracking.)
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.)
A
When the unit is installed on the wall.
B When the unit is installed on the floor.
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.
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 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