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Installation under high-humidity atmosphere
In some cases including the rainy season, especially inside of the ceiling may become high-humidity atmosphere.
1. Installation to inside of the ceiling with tiles on the roof
2. Installation to inside of the ceiling with slated roof
3. Installation to a place where inside of the ceiling is used for pathway to intake the fresh air
4. Installation to a kitchen
• In the above cases, additionally attach the heat insulator to all positions of Flow Selector unit, which come to
contact with the high-humidity atmosphere.
[Installation condition for additional insulation]
When the dry-bulb temperature inside the ceiling is 28°C or the relative temperature exceeds 80%
(The shaded area on the psychrometric chart.)
Psychrometric Chart
Installation condition
for additional
insulation
Relative humidity 80%
28°CDB
Installation and service space
Reserve suffi cient space required for installation or service work.
• Make space for installation and service. (Make space to the electrical parts box cover side for service.)
• When installing the unit inside the ceiling, be sure to create a check port.
The check port is required when the unit is installed and serviced.
• Keep a clearance of 100 mm or more between the top panel of the unit and the ceiling.
EN-11
<Installation space>
550 or more
Check port
Service hole
450
6
Bolt size : M10 or Ø3/8
(fi eld supply)
100 or more
300
or more
100 or more
600 or more
Control Box
Service hole
450
(Y1801FU12PE
only)
50
50
Enough space
to connect the
site pipe
(Unit : mm)
EN-12
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