Mitsubishi Electric TPKA0A.1KA Serie Manual De Instalación página 8

4. Installing the refrigerant piping
45°± 2°
Union joint
Male side
Lock the union joint
with a wrench.
Fig. 4-1
7
Flare nut
Female side
Tighten the flare nut
with a torque wrench.
4.1. Precautions
4.1.1. For devices that use R410A refrigerant
• Use ester oil, ether oil, 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:
W hen 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.
I f 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.
Liquid pipe ø9.52 mm, 3/8 inch thickness 0.8 mm, 1/32 inch
Gas pipe ø15.88 mm, 5/8 inch thickness 1.0 mm, 3/64 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 sea 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.
A Flare cutting dimensions
Copper pipe O.D. Flare dimensions
(mm, inch) øA dimensions (mm, inch)
ø9.52, 3/8" 12.8 - 13.2, 1/2-33/64
ø15.88, 5/8" 19.3 - 19.7, 49/64-25/32
Flare nut tightening torque
D
Copper pipe O.D. Flare nut O.D.
(mm, inch) (mm, inch)
ø9.52, 3/8"
ø15.88, 5/8"
Warning:
• B e careful of flying flare nut! (Internally pressurized)
Remove the flare nut as follows:
1. Loosen the nut until you hear a hissing noise.
2. D o not remove the nut until the gas has been completely released (i.e.,
hissing noise stops).
3. C heck 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.
A024, 030, 036
Tightening torque
(N·m, ft·lbs)
22, 7/8 34 - 42, 25-30
29, 1-9/64 68 - 82, 49-59