Mitsubishi Electric CITY MULTI PKFY-P NKMU-E2 Manual De Instalación página 7

4. Installing the refrigerant piping
B
A
45±2°
Fig. 4-1
A Flare cutting dimensions
Copper pipe O.D. Flare dimensions
(mm, inch) øA dimensions (mm, inch)
ø9.52, 3/8" 12.8 - 13.2, 1/2 - 33/64
ø15.88, 5/8" 19.3 - 19.7, 49/64 - 25/32
Refrigerant pipe sizes & Flare nut tightening torque
B
Liquid pipe
Tightening
Pipe size O.D.
torque.
(mm, inch)
(N·m, ft·lbs)
P24 ODø9.52 34 - 42
P30 3/8" 25 - 30
Do not apply refrigerating machine oil to the screw portions.
C
(This will make the flare nuts more apt to loosen.)
Be certain to use the flare nuts that are attached to the main unit.
D
(Use of commercially-available products may result in cracking.)
E Apply refrigerating machine oil over the entire flare seat surface.
 PKFY-P·NKMU-E
2-9/16
13/32
C
R22
Gas pipe
Tightening
Pipe size O.D.
torque.
(mm, inch)
(N·m, ft·lbs)
ODø15.88 68 - 82
5/8" 49 - 59
D
3-1/32
F
3-7/16
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, 212 °F
or more, thickness of 12 mm, 1/2 inch or more).
• The indoor parts of the drain pipe should be wrapped with polyethylene foam
D
insulation materials (specific gravity of 0.03, thickness of 9 mm, 23/64 inch or
more).
• Apply thin layer of refrigerant oil to pipe and joint seating surface before
tightening flare nut.
• Use two wrenches to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections.
Insulate carefully.
Liquid pipe
Tightening
Pipe size O.D.
torque.
(mm, inch)
(N·m, ft·lbs)
ODø9.52 34 - 42
3/8" 25 - 30
46-1/16
17-15/32 ( A )*
18-31/32 ( B )
23-1/32 ( C )
45-15/32
3-1/32
F
3-7/16
Fig. 4-
4.. Positioning refrigerant and drain piping (Fig. 4-)
 PKFY-P·NKMU-E
Gas pipe
A
Liquid pipe
B
Drain hose
C
Left-side piping knockout hole
D
Right-side piping knockout hole
E
Lower piping knockout hole
F
Mount board
G 1
R410A
Gas pipe
Tightening
Pipe size O.D.
torque.
(mm, inch)
(N·m, ft·lbs)
ODø15.88 68 - 82
5/8" 49 - 59
11-5/8
4-27/32
6-1/16
5-9/32
2-51/64
* Indicates the condition with accessories mounted.
Flare nut O.D.
Liquid Gas
pipe pipe
(mm, (mm,
inch) inch)
22 29
7/8 1-9/64
(inch)
3/16
G
2-9/16
E
7