Positioning Refrigerant And Drain Piping - Mitsubishi Electric City Multi PKFY-P VBM-E Série Manuel D'installation

4. Refrigerant pipe and drain pipe
660
450
520
Fig. 4-2
54
24.4
Fig. 4-3
Inclined downwards
Must be lower than outlet point
Water leakage
Trapped drainage
Air
Wavy
The end of drain pipe is under water.
Drainage ditch
5 cm or less between the end of drain pipe and
the ground
Fig. 4-4
Fig. 4-5
(mm)
110
116
(mm)
16 2.5
10
45 91.5
34
(mm)
100

4.2. Positioning refrigerant and drain piping

Position of refrigerant and drain piping (Fig. 4-2)
• The drain pipe can be cut midway to meet the on-site conditions.
(Total length of fl exible hose)
Liquid pipe
Determine the position of the knockout holes on the unit body. (Fig. 4-3)
Cut the knockout holes using a saw blade or an adequate knife.
Take care not to damage other parts of the unit.
• Remove the corner box and drill a knockout hole. If a hole is made without remov-
ing the box, the drain hose could be damaged.
Left-side piping
Lower piping
Right-side piping
Knockout hole for left-side piping
4.3. Drain piping (Fig. 4-4)
• Drain pipes should have an inclination of 1/100 or more.
• For extension of the drain pipe, use a soft hose (inner dia. 16 mm) available on
the market or hard vinyl chloride pipe (VP-16). Make sure that there is no water
leakage from the connections.
• If the drain pipe passes indoors it must be covered with insulating material (foamed
polyethylene: specifi c gravity: 0.03, thickness: 9 mm or more) available on the
market.
• Do not put the drain piping directly in a drainage ditch where sulphuric gas may
be generated.
• When piping has been completed, check that water fl ows from the end of the
drain pipe.
Caution:
The drain pipe should be installed according to this Installation Manual to
ensure correct drainage. Thermal insulation of the drain pipes is necessary
to prevent condensation. If the drain pipes are not properly installed and in-
sulated, condensation may drip on the ceiling, fl oor or other possessions.
4.4. Completing the piping (Fig. 4-5)
• To prevent condensation from dripping, put felt tape over the insulation materials
on the refrigerant and drain pipes within the unit as shown in the diagram.
• Arrange the drain hose so that it goes to the bottom of the unit.
• The overlapping width of felt tape is one half of the tape width.
Felt tape
Liquid pipe
Gas pipe
Drain piping
Viewed from the back
Take care that the middle of the drain hose is not raised.
In the case of left piping, the refrigerant pipes and the drain pipe should be taped
separately.
Wrap together the refrigerant pipes and the drain pipe with felt tape so that white felt over
laps by 20 mm or more.
* The pipes should be wrapped so that they are housed behind the unit.
Fix the end of the felt tape with a bandage fi xture.
Gas pipe
Drain hose
Corner box
Knockout hole for lower piping
Through hole for the remote controller's
cable
Knockout hole for right-side piping
5