Installing The Refrigerant Piping - Mitsubishi Electric Air-Conditioners For Building Application Installation Manual

2. Installing the indoor unit
90°
B
9-13/16 (250)
A
A Fresh air intake hole (Knock out)
B 4-1/8 in. (ø2.8) burring hole
Fig. 2-8

3. Installing the refrigerant piping

3.1. Precautions
3.1.1. For devices that use R22 refrigerant
• Use 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 to the below. Make sure the insides of the pipes are
clean and do not contain any harmful contaminants such as sulfuric com-
pounds, oxidants, debris, or dust.
A
B
45°±2°
Fig. 3-1
A Flare cutting dimensions
Flare dimensions
Copper pipe O.D.
øA dimensions
1/4" (ø6.35) 11/32-23/64 (8.7 - 9.1)
3/8" (ø9.52) 1/2-33/64 (12.8 - 13.2)
1/2" (ø12.7) 41/64-21/32 (16.2 - 16.6)
5/8" (ø15.88) 49/64-25/32 (19.3 - 19.7)
3/4" (ø19.05) 15/16-61/64 (23.6 - 24.0)
A
A
B
Fig. 3-2
Copper pipe O.D. Flare tool for R22
1/4" (ø6.35) 0-1/64 (0 - 0.5)
3/8" (ø9.52) 0-1/64 (0 - 0.5)
1/2" (ø12.7) 0-1/64 (0 - 0.5)
5/8" (ø15.88) 0-1/64 (0 - 0.5)
3/4" (ø19.05) 0-1/64 (0 - 0.5)
in. (mm)
11-3/8 (288.5)
A
C
D
in. (mm)
A Die
B Copper pipe
in. (mm)
A
Flare tool for R410A
Clutch type
3/64-1/16 (1.0 - 1.5)
3/64-1/16 (1.0 - 1.5)
3/64-1/16 (1.0 - 1.5)
3/64-1/16 (1.0 - 1.5)
3/64-1/16 (1.0 - 1.5)
2.5. Fresh air intake hole (Fig. 2-8)
At the time of installation, use the hole (knock out) located at the positions shown in
following diagram, as and when required.
Note:
Make sure that the fresh air intake is no more than 20% of the entire air intake
(when the air flow speed is set to its highest setting).
Caution:
Linkage of duct fan and air conditioner.
If a duct fan is used, be sure to link it with the air conditioner when outside air
is taken in.
Do not run just the duct fan. Otherwise, condensation may form.
3.1.2. 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 to the below. Make sure the insides of the pipes are
clean and do not contain any harmful contaminants such as sulfuric com-
pounds, oxidants, debris, or dust.
Warning:
When installing or moving the air conditioner, use only the specified refriger-
ant (R410A) to charge the refrigerant lines. Do not mix it with any other refriger-
ant and do not allow air to remain in the lines. Air enclosed in the lines can
cause pressure peaks resulting in a rupture and other hazards.
P06, P08, P12, P15
Liquid pipe 1/4" (ø6.35) thickness 1/32" (0.8)
Gas pipe 1/2" (ø12.7) thickness 1/32" (0.8)
• Do not use pipes thinner than those specified above.
3.2. Connecting pipes (Fig. 3-1)
• When commercially available copper pipes are used, wrap liquid and gas pipes
with commercially available insulation materials (heat-resistant to 212 °F (100 °C)
or more, thickness of 1/2 in. (12 mm) or more).
• The indoor parts of the drain pipe should be wrapped with polyethylene foam insu-
lation materials (specific gravity of 0.03, thickness of 23/64 in. (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. Insu-
late carefully.
B Flare nut tightening torque
Copper pipe O.D. Flare nut O.D.
in. (mm) in. (mm)
1/4" (ø6.35) 43/64 (17)
1/4" (ø6.35) 7/8 (22)
3/8" (ø9.52) 7/8 (22)
1/2" (ø12.7) 1-3/64 (26)
1/2" (ø12.7) 1-9/64 (29)
5/8" (ø15.88) 1-9/64 (29)
5/8" (ø15.88) 1-27/64 (36)
3/4" (ø19.05) 1-27/64 (36)
C Apply refrigerating machine oil over the entire flare seat surface.
D Use correct flare nuts meeting the pipe size of the outdoor unit.
Available pipe size in. (mm)
P06, P08, P12, P15
1/4" (ø6.35)
Liquid side
–
1/2" (ø12.7)
Gas side –
–
: Factory flare nut attachment to the heat-exchanger.
in. (mm)
Tightening torque
ft·lbs. (N·m)
10-13 (14 - 18)
25-30 (34 - 42)
25-30 (34 - 42)
35-44 (49 - 61)
49-59 (68 - 82)
49-59 (68 - 82)
72-87 (100 - 120)
72-87 (100 - 120)
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