Installing The Refrigerant Piping - Mitsubishi Electric PCFY-PVKM-E-Serie Installationshandbuch

3. Installing the indoor unit
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
torque
(mm)
(N.m)
P40 ODø6.35 (1/4") 14 - 18
P63 ODø9.52 (3/8") 34 - 42
P100/125 ODø9.52 (3/8") 34 - 42
* Flare nut ø19.05 (purchased locally): Gas pipe of P100, P125 (R407C or R22).
Fig. 4-2
4
7~12
B
C
B
R407C or R22
Gas pipe
Tightening
Pipe size
torque
(mm)
(N.m)
ODø12.7 (1/2") 49 - 61
ODø15.88 (5/8") 68 - 82
ODø19.05 (3/4") 68 - 82*
2) Installing the suspending bracket first onto the ceiling (Fig. 3-6)
Installing procedures
1. Remove the suspending brackets and U-shaped washers from the unit.
2. Adjust the suspending bracket holding bolts on the unit.
3. Attach the suspending brackets to the suspending bolts.
4. Check that the suspending brackets are horizontal (front and rear / right and left).
5. Set (hook) the unit to the suspending brackets.
6. Tighten fixed bolts of the suspending brackets.
w Be sure to install the U-shaped washers.
A Suspending bracket holding bolt
B Unit
C U-shaped washer
D Suspending bolt
E Washer 1
F 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 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)
(N.m)
ODø6.35 (1/4") 14 - 18 ODø12.7 (1/2")
ODø9.52 (3/8") 34 - 42 ODø15.88 (5/8")
ODø9.52 (3/8") 34 - 42 ODø15.88 (5/8")
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 (20 mm) with the supplied
bands 4.
A Gas tubing E Pipe cover 3
B Liquid tubing F Press the pipe cover against the sheet metal.
C Band 4 G Refrigerant tubing heat insulating material
D Pipe cover 2
P40
G
P63
P100, P125
Flare dimensions
ø A dimensions (mm)
8.7 - 9.1
12.8 - 13.2
16.2 - 16.6
19.3 - 19.7
22.9 - 23.3
Flare nut O.D.
Gas pipe
Tightening
Liquid pipe
torque
(mm) (mm)
(N.m)
49 - 61 17
68 - 82 22
68 - 82 22
(mm)
882 - 887
1202 - 1207
1522 - 1527
Gas pipe
(mm)
26
29
29