Refrigerant Pipe And Drain Pipe - Mitsubishi Electric PKFY-P NBMU-E2 Series Installation Manual

3. Installing the indoor unit
2-2
Fig. 3-6
Fig. 3-8

4. Refrigerant pipe and drain pipe

45 ±2
Fig. 4-1
B Refrigerant pipe sizes & Flare nut tightening torque
Liquid pipe
Pipe size
(mm, inch)
ODø6.35
P06
1/4"
C Do not apply refrigeranting machine oil to the screw portions.
(This will make the flare nuts more apt to loosen.)
D Be certain to use the flare nuts that are attached to the main unit.
(Use of commercially-available products may result in cracking.)
E Apply refrigeranting machine oil over the entire flare seat surface.
4
3
Fig. 3-7
(inch)
R22
Gas pipe
Tightening Tightening
Pipe size
torque torque
(mm, inch)
(N·m, ft·ibs) (N·m, ft·ibs)
14-18 ODø12.7 49-61
10-13 1/2" 35-44
2-2 Lift the indoor unit by hooking the supporting piece (attached to the mount
board) to the ribs on the back of the unit as shown. (Fig. 3-6)
When piping work etc. is complete, replace the supporting piece on the
mount board.
(If the unit is not fixed securely, vibration may occur during operation.)
A Mount board
Supporting piece
B
C Rib
3 If the flare pipe is to be embedded into the wall in advance: (Fig. 3-7)
• Determine the length of pipe to be embedded by marking on the mounting plate
as a reference.
L Mark
1 Wall mounting fixture
3.3. Mounting the unit (Fig. 3-8)
1 Securely place the hanging fixtures for the indoor unit over the catches on the
wall mounting fixture.
A Indoor unit
Wall mounting fixture
B
C Catch
2 When piping has been completed, install the indoor unit and wall mounting
fixture with fixing screws.
4.1. 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).
• 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.
Insulate carefully. Insulate carefully.
A Flare cutting dimensions
Copper pipe O.D.
(mm, inch) øA 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
R410A
Liquid pipe
Tightening
Pipe size Pipe size
torque
(mm, inch) (mm, inch)
(N·m, ft·ibs)
ODø6.35 14-18 ODø12.7
1/4" 10-13 1/2"
Flare dimensions
Flare nut O.D.
Gas pipe
Tightening
Liquid pipe
torque
(mm, inch)
(N·m, ft·ibs)
49-61 17
35-44 43/64
Gas pipe
(mm, inch)
26
1-7/64