Mitsubishi Electric PKA-ALA Serie Manuel D'installation page 7

4. Installing the refrigerant piping
45°±2°
D
Union joint
Male side
Lock the union joint
with a wrench.
Fig. 4-1
A Flare cutting dimensions
Copper pipe O.D. (mm, inch)
dimensions (mm, inch)
ø6.35, 1/4" 8.7 - 9.1, 11/32 - 23/64
ø12.7, 1/2" 16.2 - 16.6, 41/64 - 21/32
E
F
Fig. 4-2
Copper pipe O.D. (mm, inch)
ø6.35, 1/4"
ø12.7, 1/2"
LEFT FRONT
49 (1-15/16) 650 (25-19/32)
D
FRONT (OPEN THE GRILLE)
533 (20-63/64) (
C
BOTTOM
E
Fig. 4-3
Flare nut
Female side
Tighten the flare nut
with a torque wrench.
Flare dimensions øA
B
E Die
F Copper pipe
B (mm, inch)
Flare tool for R410A
Clutch type
0 - 0.5, 0 - 1/64
0 - 0.5, 0 - 1/64
mm (inch)
RIGHT
237 (9-11/32)
199 (7-53/64)
898 (35-23/64)
450 (17-23/32) ( ) 192 (7-9/16)
A
) 178 (7-1/64)
B
160 (6-19/64)
E
4.1. Precautions
For devices that use R410A refrigerant
• Use alkylbenzene oil (small amount) as the refrigeration oil applied to the
flared sections.
• Use C1220 copper phosphorus for copper and copper alloy seamless pipes, to
connect the refrigerant pipes. Use refrigerant pipes with the thicknesses specified
in the table below. Make sure the insides of the pipes are clean and do not contain
any harmful contaminants such as sulfuric compounds, oxidants, debris, or dust.
Warning:
When installing or relocating, or servicing the air conditioner, use only the
specified refrigerant written on outdoor unit to charge the refrigerant lines. Do
not mix it with any other refrigerant and do not allow air to remain in the lines.
If air is mixed with the refrigerant, then it can be the cause of abnormal high
pressure in the refrigerant line, and may result in an explosion and other hazards.
The use of any refrigerant other than that specified for the system will cause
mechanical failure or system malfunction or unit breakdown. In the worst
case, this could lead to a serious impediment to securing product safety.
ø6.35 mm, 1/4 inch thickness
0.8 mm, 1/32 inch
ø12.7 mm, 1/2 inch thickness
0.8 mm, 1/32 inch
• Do not use pipes thinner than those specified above.
4.2. 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
insulation materials (specific gravity of 0.03, thickness of 9 mm, 23/64 inch or more).
• Flare the ends of the refrigerant pipes. A
• Apply refrigerating machine oil over the entire flare seat surface. B
• Use the flare nuts as follows. C
• For connection, first align the center, then tighten the first 3 to 4 turns of flare nut by hand.
• Use 2 wrenches to tighten piping connections. D
• Use refrigerant piping insulation provided to insulate indoor unit connections.
Insulate carefully.
• After connecting the refrigerant piping to the indoor unit, be sure to test the pipe
connections for gas leakage with nitrogen gas. (Check that there is no refrigerant
leakage from the refrigerant piping to the indoor unit.)
• Use flared nut installed to this indoor unit.
• In case of reconnecting the refrigerant pipes after detaching, make the flared part
of pipe re-fabricated.
Flare nut tightening torque
D
Copper pipe O.D.
(mm, inch)
ø6.35, 1/4
ø12.7, 1/2
Warning:
• Be careful of flying flare nut! (Internally pressurized)
Remove the flare nut as follows:
1. Loosen the nut until you hear a hissing noise.
2. Do not remove the nut until the gas has been completely released (i.e.,
hissing noise stops).
3. Check that the gas has been completely released, and then remove the nut.
• When installing the unit, securely connect the refrigerant pipes before starting
the compressor.
4.3. Positioning refrigerant and drain piping (Fig. 4-3)
A Gas pipe * Indicates the condition with accessories mounted.
F
B Liquid pipe
C Drain hose (Effective length: 500 mm, 19-11/16 inch)
D Left-side piping knockout hole
5 (13/64)
E Right-side piping knockout hole
F Lower piping knockout hole
G Mount board 1
ø9.52 mm, 3/8 inch thickness
0.8 mm, 1/32 inch
ø15.88 mm, 5/8 inch thickness
1.0 mm, 3/64 inch
Flare nut O.D. Tightening torque
(mm, inch) (N·m, ft·lbs)
17, 43/64 14 - 18, 10 - 13
28, 1-7/64 49 - 61, 35 - 44
en
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