Mitsubishi Electric City Multi PMFY-P NBMU Serie Manual De Instalación página 6

3. Installing the refrigerant piping
A
45° ± 2°
Flare nut
Internal thread side
Tighten the flare nut
with a torque wrench.
Flare cutting dimensions
A
Copper pipe O.D.
ø6.35 (1/4")
ø9.52 (3/8")
ø12.7 (1/2")
ø15.88 (5/8")
ø19.05 (3/4")
A
B
Copper pipe O.D.
ø6.35 (1/4")
ø9.52 (3/8")
ø12.7 (1/2")
ø15.88 (5/8")
ø19.05 (3/4")
3.2. Connecting pipes (Fig. 3-1)
When commercially available copper pipes are used, insulate both the liquid and
en
gas pipes separately with commercially available insulation materials (heat-resistant
to 100 °C, 212 °F or more, thickness of 12 mm, 1/2 in. or more). (Fig. 3-3)
• 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 in.) or more).
Flare nut tightening torque
B
Pipe size
(mm, in.)
ODø6.35
P06, P08, P12, P15
Apply refrigerating machine oil over the entire flare seat surface.
C
* Do not apply refrigerating machine oil to the screw portions. (This will make the flare nuts more apt to loosen.)
Be certain to use the flare nuts those are attached to the main unit. (Use of commercially-available products may result in cracking.)
D
5
B
D
Union joint
External thread side
Grip the nut on the
union joint with a wrench.
Fig. 3-1
mm (in.)
Flare dimensions
øA dimensions
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 (49/64-25/32)
23.6 - 24.0 (15/16-61/64)
A
Die
A
Copper pipe
B
Fig. 3-2
mm (in.)
A
Flare tool for R410A
Clutch type
0 - 0.5 (0-1/64)
0 - 0.5 (0-1/64)
0 - 0.5 (0-1/64)
0 - 0.5 (0-1/64)
0 - 0.5 (0-1/64)
R410A
Liquid pipe Gas pipe
Tightening
Pipe size
torque
(mm, in.)
(N·m, ft·lbs)
14 - 18 ODø12.7
1/4" 10 - 13 1/2"
3.1. Precautions
mm (in.)
3.1.1. For devices that use R410A refrigerant
• Use C1220 copper phosphorus, for copper and copper alloy seamless pipes,
C
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 compounds,
oxidants, debris, or dust.
Warning:
When installing or relocating, or servicing the air conditioner, use only the
specified refrigerant (R410A) 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.
Liquid pipe
Gas pipe
• Do not use pipes thinner than those specified above.
• Apply thin layer of refrigerant oil to pipe and joint seating surface before tightening
flare nut.
• Use 2 wrenches to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections.
Insulate carefully.
Flare nut O.D.
Tightening
Liquid pipe Gas pipe
torque
(mm, in.) (mm, in.)
(N·m, ft·lbs)
49 - 61 17
35 - 44 43/64 1-7/64
P06, P08, P12, P15
ø6.35 (1/4") thickness 0.8 (1/32")
ø12.7 (1/2") thickness 0.8 (1/32")
D
C
Liquid pipe
A
Gas pipe
B
Insulation
C
B
Taping
D
A
Fig. 3-3
26
mm (in.)