Installing The Refrigerant Piping - Mitsubishi Electric CITY MULTI PKFY-P Installationshandbuch

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)
ø9.52 12.8 - 13.2
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)
P63 ODø9.52 (3/8") 34 - 42
P100 ODø9.52 (3/8") 34 - 42
* Connect the joint with the following pipes: Liquid and gas pipes of P50, gas pipe of P100/P125.
E Apply refrigerating machine oil over the entire flare seat surface.
PKFY-P·VKM-E
65
C
R407C or R22
Gas pipe
Tightening
Pipe size O.D.
torque.
(mm)
(N·m)
ODø15.88 (5/8") 68 - 82
ODø19.05 (3-4") 68 - 82*
77
18.2 87
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.
Warning:
When installing the unit, securely connect the refrigerant pipes before start-
ing the compressor.
R410A
Liquid pipe
Tightening
Pipe size O.D.
torque.
(mm)
(N·m)
ODø9.52 (3/8") 34 - 42
ODø9.52 (3/8") 34 - 42
1170
1155
Fig. 4-2
4.2. Positioning refrigerant and drain piping (Fig. 4-2)
PKFY-P·VKM-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 1
Mount board
Gas pipe
Tightening
Pipe size O.D.
torque.
(mm)
(N·m)
ODø15.88 (5/8") 68 - 82
ODø15.88 (5/8") 68 - 82
295
123
154
134
77
87 71.2
Flare nut O.D.
Liquid Gas
pipe pipe
(mm) (mm)
22 29
22 29
5
65
7