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MULTI TYPE
4 rooms type
Condition Contents Countermeasures (Reference)
When inside
the ceiling is
high
temperature
and high
humidity.
When the indoor unit is installed where the inside of
the ceiling is 30°C (86°F) RH80% or greater, the dew
point temperature of the outer perimeter may
become higher than the cabinet surface temperature
and moisture will condense on the surface of the
cabinet and water drops may fall inside the room.
→Refer to Fig. A.
In addition, the humidity may vary considerably the
same as when the inside of the ceiling is close to
hermetically sealed and used as the outside air
intake path.
1. Add heat insulating material to
the outside of the indoor unit
cabinet.
*Regarding the cassette
type, use of optional High
humidity correspondence
kit is recommended.
2. Strengthen the heat insulating
material of the refrigerant
piping and drain piping too.
→Refer to Fig. B.
3. When the humidity inside the
ceiling changes considerably,
install a ventilation port.
Moist air curve
Condition which
requires addition
of outside heat
insulation
Relative humidity 80%
Dry bulb temperature 30°C (86°F)
Fig. A
Work method when reinforcing the heat insulation
of on-site piping
Fig. B
Slit of heat insulating
material facing
upward
Covered gas
pipe (heat
insulation
strengthened)
Heat insulating
material (procured at
the site)
Small exposed part
of copper pipe is
desirable.
Fit tightly
(purpose is to
cover the sealant)
Binding material
Flare connection
To indoor unit
Heat insulation
reinforcement material
(procured at the site)
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