Refrigerant Pipe And Drain Pipe - Mitsubishi Electric CITY MULTI PKFY-P*VBM-E Installationshandbuch

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

4. Refrigerant pipe and drain pipe

45 ±2
Fig. 4-1
Refrigerant pipe sizes & Flare nut tightening torque
Liquid pipe
Tighten-
Pipe size(mm) ing torque
P15/P20/25 ODø6.35 (1/4")
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 that are attached to the main unit.
(Use of commercially-available products may result in cracking.)
Apply refrigerating machine oil over the entire flare seat surface.
4
Fig. 3-7
R407C or R22
Gas pipe
Tightening
Pipe size (mm) torque
(N.m) (N.m)
14 - 18 ODø12.7 (1/2") 49 - 61
- 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.)
Mount board
Supporting piece
Rib
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.
Mark
Wall mounting fixture
3.3. Mounting the unit (Fig. 3-8)
Securely place the hanging fixtures for the indoor unit over the catches on the
wall mounting fixture.
Indoor unit
Wall mounting fixture
Catch
When piping has been completed, install the indoor unit and wall mounting fix-
ture 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 or more,
thickness of 12 mm or more).
• The indoor parts of the drain pipe should be wrapped with polyethylene foam in-
sulation materials (specific gravity of 0.03, thickness of 9 mm or more).
• Apply thin layer of refrigerant oil to pipe and joint seating surface before tighten-
ing flare nut.
• Use two wrenches to tighten piping connections.
• Use refrigerant piping insulation provided to insulate indoor unit connections. In-
sulate carefully.
Warning:
When installing the unit, securely connect the refrigerant pipes before start-
ing the compressor.
Flare cutting dimensions
Copper pipe O.D.
(mm)
ø6.35
ø12.7
R410A
Liquid pipe
Tightening
Pipe size (mm) torque Pipe size (mm)
(N.m)
ODø6.35 (1/4") 14 - 18 ODø12.7 (1/2")
Flare dimensions
øA dimensions (mm)
8.7 - 9.1
16.2 - 16.6
Flare nut O.D.
Gas pipe
Tightening
Liquid pipe
torque
(mm)
(N.m)
49 - 61 17
Gas pipe
(mm)
26