Mitsubishi Electric PMFY-P VBM-E Série Manuel D'installation page 5

3. Refrigerant pipe and drain pipe
45°±2°
Fig. 3-2
B Refrigerant pipe sizes & Flare nut tightening torque
Liquid pipe
Pipe size
(mm)
P20/25/32/40 O.D. ø6.35 (1/4")
Max. 20m
0.75 –1.5m
Fig. 3-4
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. 3-3
Max. 15cm
.. Connecting pipes (Fig. -)
• 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 in-
sulation 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 2 wrenches to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections. In-
sulate 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)
(N.m)
O.D. ø6.35 (1/4") 14 - 18 O.D. ø12.7 (1/2")
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 that are attached to the main unit.
(Use of commercially-available products may result in cracking.)
Installing procedures (Fig. 3-3)
1. Remove the flare nuts and caps from the indoor unit.
2. Flare-cut the liquid and gas pipes then apply refrigerating machine oil (to be lo-
cally procured) over the flare-cut seat surface.
3. Quickly connect the refrigerant piping.
* Remember to tighten the flare nuts with a double spanner.
4. Slide the supplied pipe cover
sheet metal inside the unit.
5. Slide the provided pipe cover
the sheet metal inside the unit.
6. Tighten the pipe cover at the both ends (15 - 20 mm) with the supplied bands
3
A Gas piping
B Liquid piping
C Band (large) 4
D Pipe cover 3
3.3. Drainage piping work (Fig. 3-4)
• Use O.D. ø26 mm PVC TUBE for drain piping and provide 1/100 or more down-
ward slope.
• Be sure to connect the piping joints using adhesive of polyvinyl chloride family.
• Observe the figure for piping work.
• Use attached drain hose to change the pipe extraction direction.
1 Correct piping
2 Wrong piping
A Insulation (9 mm or more)
B Downward slope (1/100 or more)
C Support metal
Grouped piping
D VP-20 (O.D. ø26 PVC TUBE)
E Make it as large as possible.
F Indoor unit
G Make the piping size large for grouped
piping.
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
torque
(mm) (mm)
(N.m)
49 - 61 17
over the gas piping until it is pressed against the
3
over the liquid piping until it is pressed against
3
E Turn the seam upward.
F Press the pipe cover against the sheet metal.
G Refrigerant piping heat insulating material
H Wrap tightly.
I Cut off excess length of band.
K Air bleeder
L Raised
M Odour trap
N Make as little as possible.
O Make as great as possible (approx. 10 cm).
H Downward slope (1/100 or more)
I O.D. ø38 PVC TUBE for grouped piping
(9 mm or more insulation)
J Up to 50 cm
Gas pipe
(mm)
26
.
4