5
4.2. Positioning refrigerant and drain piping
1
Position of refrigerant and drain piping (Fig. 4-2)
• The drain pipe can be cut midway to meet the on-site conditions.
A
(Total length of flexible hose)
B
Liquid pipe
C
Gas pipe
D
Drain hose
2
Determine the position of the knockout holes on the unit body. (Fig. 4-3)
X
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
removing the box, the drain hose could be damaged.
E
Left-side piping
F
Lower piping
G
Right-side piping
H
Knockout hole for left-side piping
I
Corner box
J
Knockout hole for lower piping
K
Through hole for the remote controller’s cable
L
Knockout hole for right-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, 5/8 inch)
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: specific gravity: 0.03, thickness: 9 mm, 23/64 inch 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 flows 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
insulated, condensation may drip on the ceiling, floor 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.
A
Felt tape
B
Liquid pipe
C
Gas pipe
D
Drain piping
E
Viewed from the back
F
Take care that the middle of the drain hose is not raised.
G
In the case of left piping, the refrigerant pipes and the drain pipe should be taped
separately.
H
Wrap together the refrigerant pipes and the drain pipe with felt tape so that white felt over
laps by 20 mm, 25/32 inch or more.
* The pipes should be wrapped so that they are housed behind the unit.
I
Fix the end of the felt tape with a bandage fixture.
4. Refrigerant pipe and drain pipe
1
(inch)
Fig. 4-4
Fig. 4-3
Fig. 4-5
23-5/8
4-11/32
17-23/32
20-15/32
4-9/16
2-1/8
31/32
3/8
1-25/32
3/8
1-31/32
3/32
5/8
1-25/32 3-19/32
25/64
1-11/32
5/32
1-31/32
3/8
3/32
A
Inclined downwards
B
Must be lower than outlet point
C
Water leakage
D
Trapped drainage
E
Air
F
Wavy
G
The end of drain pipe is under water.
H
Drainage ditch
I
5 cm, 13/64 inch or less between the end of
drain pipe and the ground
3-15/16
2
(inch)
(inch)
Fig. 4-2
