Installing The Refrigerant Piping - Mitsubishi Electric CITY MULTI PKFY-P-VHM-E Manuel D'installation

4. Installing the refrigerant piping

A B
45±2°
Fig. 4-1
A Flare cutting dimensions
Copper pipe O.D. Flare dimensions
(mm) øA dimensions (mm)
ø6.35
ø9.52 12.8 - 13.2
ø12.7 16.2 - 16.6
ø15.88 19.3 - 19.7
ø19.05 22.9 - 23.3
B Refrigerant pipe sizes & Flare nut tightening torque
C 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.)
Liquid pipe
Tightening
Pipe size O.D.
torque.
(mm)
(N·m)
P32/40 ODø6.35 (1/4") 14 - 18
P50 ODø9.52 (3/8") 14 - 18*
* Connect the joint with the following pipes: Liquid and gas pipes of P50.
E Apply refrigerating machine oil over the entire flare seat surface.
PKFY-P·VHM-E
6
C
8.7 - 9.1
R407C or R22
Gas pipe
Tightening
Pipe size O.D.
torque.
(mm)
(N·m)
ODø12.7 (1/2") 49 - 61
49 - 61*
ODø15.88 (5/8")
D
F
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
D
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
tightening flare nut.
• Use two wrenches to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections.
Insulate carefully.
R410A
Liquid pipe
Tightening
Pipe size O.D.
torque.
(mm)
(N·m)
ODø6.35 (1/4") 14 - 18
ODø6.35 (1/4") 14 - 18
( B )
( A )
( C )
F
Fig. 4-2
4.2. Positioning refrigerant and drain piping (Fig. 4-2)
PKFY-P·VHM-E
A Gas pipe * Indicates the condition with accessories mounted.
B Liquid pipe
C Drain hose
D Left-side piping knockout hole
E Right-side piping knockout hole
F Lower piping knockout hole
G Mount board 1
Flare nut O.D.
Gas pipe
Tightening Liquid
Pipe size O.D.
torque. pipe
(mm)
(N·m) (mm)
ODø12.7 (1/2") 49 - 61 17
49 - 61 17
ODø12.7 (1/2")
G
E
Gas
pipe
(mm)
26
26