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4.8. INSTALLING INSULATION
• Install a insulation after performing “5.1. SEALING TEST”.
• Use an insulation on the refrigerant pipes to prevent condensation
and dripping. (Fig. 4.8-1)
• Determine the thickness of the insulation material by referring to Table 4.8-1.
• If the outdoor unit is installed at a level that is higher than the indoor unit, the water that has
condensed in the 3-way valve of the outdoor unit could travel to the indoor unit.
Therefore, use putty in the space between the pipe and the insulation to prevent the entry of water.
4.9. DRAIN PROCESSING
Perform the following steps to provide drain processing.
• Remove the rear panel.
• Open the 3 knockout holes shown in Fig. 4.9-1.
• Install the drain pipe (accessories) in the installation hole of the drain cover.
• Install a commercially available 16 mm drain hose on the drain pipe.
• Always provide drainage at the 3 locations.
Tip immersed in water
<
=
70%
<
=
75%
<
=
80%
<
=
85%
6.35
8
10
13
17
9.52
9
11
14
18
12.70
10
12
15
19
15.88
10
12
16
20
19.05
10
13
16
21
22.22
11
13
17
22
28.58
11
14
18
23
34.92
11
14
18
24
41.27
12
15
19
25
Table 4.8-1 Selection of insulation
(for using an insulation material with equal heat transmission rate or below 0.040 W/(m·k))
Insulation material
Minimum thickness (mm)
Pipe diameter
(mm)
Outdoor unit
Gutter
10 mm or more
50 mm
or more
OK
No Good
hose
Raised
Wavy
Fig. 4.9-1
Relative humidity
Drain water could leak from the outdoor unit during
cooling or heating operation.
Provide drain processing as necessary.
To prevent drain water from flowing around the unit,
install a drainage channel as shown on the right.
Knockout hole:
Be careful not to deform or scratch the panel while opening the knockout holes.
After opening the knockout holes, deburr the edges to prevent them from cutting the wires.
CAUTION
Drain processing:
Do not use a drain hose in a cold region, as it can cause the inside of the drain hose to freeze.
If it is necessary to provide drainage, take appropriate measures to prevent the inside of the drain hose
from freezing.
Do not open this knockout hole.
Insulation
Fig. 4.8-1
Putty
Drain pipe mounting holes
Rear panel
Rear panel
Hose
Drain pan
Drain pipe
Open this
knockout hole
Drain hose processing
* When an ambient temperature and relative humidity exceed 32 °C, please strengthen heat insulation of refrigerant pipe.
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