Installing The Refrigerant Piping - Mitsubishi Electric CITY MULTI PKFY-P NLMU Série Manuel D'installation

4. Installing the refrigerant piping

A
45°±2°
A Flare cutting dimensions
Copper pipe O.D.
(mm, inch)
ø6.35, 1/4
ø9.52, 3/8
ø12.7, 1/2
ø15.88, 5/8
ø19.05, 3/4
B Refrigerant pipe sizes & Flare nut tightening torque
Liquid pipe
Pipe size O.D. Tightening torque.
(mm, inch)
ODø6.35, 1/4 14 - 18, 10 - 13
C Apply refrigerating machine oil over the entire flare seat surface.
■ PKFY-P04/06/08/12NLMU
LEFT FRONT
49 (1-15/16)
D
FRONT(OPEN THE GRILLE)
C
BOTTOM
■ PKFY-P15/18NLMU
LEFT FRONT
en
49 (1-15/16)
D
FRONT(OPEN THE GRILLE)
C
BOTTOM
5
B
Fig. 4-1
Flare dimensions øA dimensions
(mm, inch)
8.7 - 9.1, 11/32 - 23/64
12.8 - 13.2, 1/2 - 33/64
16.2 - 16.6, 41/64 - 21/32
19.3 - 19.7, 49/54 - 25/32
22.9 - 23.3, 15/16 - 61/64
R410A
Pipe size O.D.
(N·m, ft·lbs) (mm, inch)
ODø12.7, 1/2
525 (20-43/64) 199 (7-53/64)
773 (30-7/16)
360 (14-11/64)
192 (7-9/16)
423 (16-21/32) 178 (7-1/64)
160 (6-19/64)
E E
650 (25-19/32) 199 (7-53/64)
898 (35-3/8)
450 (17-23/32) ( ) 192 (7-9/16)
A
533 (20-63/64) ( ) 178 (7-1/64)
B
160 (6-19/64)
Fig. 4-2
E
E
4.1. Connecting pipes (Fig. 4-1)
mm (inch)
C
• 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).
• Apply thin layer of refrigerant oil to pipe and joint seating surface before
B
tightening flare nut.
• Use two wrenches to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections.
Insulate carefully.
• Do not apply refrigerating machine oil to the screw portions.
(This will make the flare nuts more apt to loosen.)
• Use flare nut installed to this indoor unit.
Warning:
When installing the unit, securely connect the refrigerant pipes before
starting the compressor.
Gas pipe
Tightening torque. Liquid pipe
(N·m, ft·lbs) (mm, inch)
49 - 61, 35 - 44 17, 43/64
mm (inch)
4.2. Positioning refrigerant and drain piping (Fig. 4-2)
RIGHT
A Gas pipe
B Liquid pipe
F
C Drain hose (Effective length: 500 mm, 19-11/16 inch)
D Left-side piping knockout hole
E Lower piping knockout hole
237 (9-11/32) 5 (13/64)
F Mount board 1
RIGHT
F
237 (9-11/32) 5 (13/64)
Flare nut O.D.
Gas pipe
(mm, inch)
26, 1-1/32
* Indicates the condition with accessories mounted.