Mitsubishi Electric PKFY-P20VBM-E [4/14] Installing the indoor unit

Fig. 3-6 Fig. 3-7

Fig. 3-8

3. Installing the indoor unit

4. Refrigerant pipe and drain pipe

90 ±0.5

øA

R0.4 - R0.

45 ±2

Fig. 4-1

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)

Flare dimensions

øA dimensions (mm)

ø6.35 8.7 - 9.1

ø12.7 16.2 - 16.6

- 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.

Refrigerant pipe sizes & Flare nut tightening torque

R407C or R22 R410A

Flare nut O.D.

Liquid pipe Gas pipe Liquid pipe Gas pipe

Pipe size(mm)

Tighten-

ing torque

(N.m)

Pipe size (mm)

Tightening

torque

(N.m)

Pipe size (mm)

Tightening

torque

(N.m)

Pipe size (mm)

Tightening

torque

(N.m)

Liquid pipe

(mm)

Gas pipe

(mm)

P15/P20/25 ODø6.35 (1/4”) 14 - 18 ODø12.7 (1/2”) 49 - 61 ODø6.35 (1/4”) 14 - 18 ODø12.7 (1/2”) 49 - 61 17 26

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.

Mitsubishi Electric PKFY-P20VBM-E [4/14] Installing the indoor unit

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