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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.
Table 4.8-1 Selection of insulation
(for using an insulation material with equal heat transmission rate or below 0.040 W/(m·k))
Relative humidity
Pipe diameter
(mm)
* When an ambient temperature and relative humidity exceed 32 °C, please strengthen heat insulation of refrigerant pipe.
4.9. DRAIN PROCESSING
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.
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.
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.
Fig. 4.9-1
Rear panel
Drain pipe mounting holes
Drain pan
Drain pipe
9374241033_IM_en_p01-17.p65
< = 70%
6.35
8
9.52
9
12.70
10
15.88
10
19.05
10
22.22
11
28.58
11
34.92
11
41.27
12
Rear panel
Hose
Open this
knockout hole
Do not open this knockout hole.
17
Insulation material
Minimum thickness (mm)
< = 75%
10
11
12
12
13
13
14
14
15
CAUTION
Outdoor unit
Gutter
Drain hose processing
OK
hose
No Good
Raised
26/8/2008, 18:23
Fig. 4.8-1
Insulation
Putty
< = 80%
< = 85%
13
17
14
18
15
19
16
20
16
21
17
22
18
23
18
24
19
25
50 mm
or more
10 mm or more
Wavy
Tip immersed in water
En-17
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