Mitsubishi Electric Mr.Slim PUZ-A NHA6 Series Installation Manual page 5

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A Flare cutting dimensions
B Flare nut tightening torque
Gas side Pipe size (mm, inch)
Liquid side Pipe size (mm, inch)
A (Fig. 4-1)
Flare dimensions
Copper pipe O.D.
øA dimensions
( (mm) ) ( (inch) ) (mm) (
ø6.35 1/4" 8.7 - 9.1
ø9.52 3/8" 12.8 - 13.2
ø12.7 1/2" 16.2 - 16.6
ø15.88 5/8" 19.3 - 19.7
B (Fig. 4-1)
Copper pipe O.D. pp p p p Flare nut O.D.
(mm) ( ) ( (inch) ) (mm) (
ø6.35 1/4" 17
ø9.52 3/8" 22
ø12.7 1/2" 26
ø15.88 5/8" 29
A12, A18
D
D D
A Front piping cover
B Piping cover
C Stop valve
D Service panel
E Bend radius : 100 mm, 3-15/16 inch-150 mm, 5-27/32 inch
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A
Liquid pipe
B
Gas pipe
C
Inslation
D
Taping
B
C
D
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A12, A18 A24 - A42
ø12.7, 1/2" ø15.88, 5/8"
ø6.35, 1/4" ø9.52, 3/8"
) ( (inch) )
11/32 - 23/64
1/2 - 33/64
41/64 - 21/32
49/64 - 25/32
Tightening torque g g
) (inch) ( ) ( (N·m) )
43/64 14 - 18 10 - 13
7/8 34 - 42 25 - 30
1 - 3/64 49 - 61 35 - 44
1 - 9/64 68 - 82 49 - 59
A24-A42
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to connect the refrigerant pipes. Use refrigerant pipes with the thicknesses
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clean and do not contain any harmful contaminants such as sulfuric com-
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Warning:
When installing or relocating, or servicing the air conditioner, use only the
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any other refrigerant and do not allow air to remain in the lines.
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mechanical failure or system malfunction or unit breakdown. In the worst
case, this could lead to a serious impediment to securing product safety.
(inch)
Liquid pipe
thickness 0.8 mm, 1/32 inch
Gas pipe
thickness 0.8 mm, 1/32 inch
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When commercially available copper pipes are used, inslate both the liquid and
gas pipes separately with commercially available insulation materials (heat-resist-
ant to 100 °C, 212 °F or more, thickness of 12 mm, 1/2 inch or more). (Fig. 4-1)
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[Fig. 4-2]
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completed.
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traction may occur.
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may result.
1 Pipes must be connected starting from the indoor unit.
Flare nuts must be tightened with a torque wrench.
2 Flare the liquid pipes and gas pipes and apply a thin layer of refrigeration oil
(Applied on site).
Warning:
When installing the unit, securely connect the refrigerant pipes before starting
the compressor.
q
( (ft·lbs) )
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Remove the service panel D (1 screw).
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Remove the service panel D (3 screws) and the front piping cover A (2 screws) and
rear piping cover B (2 screws).
1 Perform refrigerant piping connections for the indoor/outdoor unit when the out-
door unit's stop valve is completely closed.
2 Vacuum-purge air from the indoor unit and the connection piping.
3 After connecting the refrigerant pipes, check the connected pipes and the indoor
unit for gas leaks. (Refer to 4.4 Refrigerant pipe airtight testing method)
4 Vacuumize the refrigerant lines through the service port of the liquid stop valve
and then open the stop valves completely (for both the liquid and gas stop valves).
This will completely connect the refrigerant lines of the indoor and outdoor units.
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C C
control valves will be damaged.
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sections of the outdoor unit.
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B B 20 to 25 N·m, 14 to 18 ft·lbs (200 to 250 kgf·cm).
Failure to replace and tighten the caps may result in refrigerant leakage. In addi-
tion, do not damage the insides of the valve caps as they act as a seal to prevent
refrigerant leakage.
5 Use sealant to seal the ends of the thermal insulation around the pipe connection
sections to prevent water from entering the thermal insulation.
A12, A18
ø6.35 mm, 1/4inch ø9.52 mm, 3/8 inch
thickness 0.8 mm, 1/32 inch
ø12.7 mm, 1/2 inch ø15.88 mm, 5/8 inch
thickness 1.0 mm, 3/64 inch
A24-A42
5