18
Multi F Ceiling Cassette Indoor Unit
Due to our policy of continuous product innovation, some specifications may change without notification.
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MAX
MULTI
F
MULTI
F
Ceiling Height
Mode Selection
IHHW
Low Ceiling
7-1/2 feet to 8-7/8 feet
Standard
8-7/8 feet to 10-3/16 feet
High Ceiling
10-3/16 feet to 11-13/16 feet
Very High Ceiling
Table 8: Ceiling Cassette Indoor Unit High Ceiling Mode Selection
Options.
Installing in an Area with High Humidity Levels
If the environment is prone to humidity levels of 80% or more (near the ocean, lakes,
etc.) or where steam could collect in the plenum:
• Install additional insulation to the indoor unit (glass wool insulation >13/32 inches
thick).
• Install additional insulation to the refrigerant piping (insulation >13/16 inches thick).
• Seal all gaps between the indoor unit and the ceiling tiles (make the area air tight) so
that humidity does not transfer from the plenum to the conditioned space. Also, add a
ceiling grille for ventilation.
Ventilation Grille
Figure 7: Installing in a Highly Humid Location.
Installing in a High or Dropped Ceiling
High or dropped ceilings, often found in commercial buildings and
offices, will cause a wide temperature differentiation. To countermea-
sure:
• Change the indoor unit mode selection to allow for higher ceilings
(see table).
• Install an air circulator.
• Set the air discharge outlet so that heated air flows in a downward
direction.
• Use a dual door system to protect the building gate or exit.
Figure 8: Installing Multiple Indoor Units.
Installing Multiple Indoor Units in One Area
Ensure there is enough space between indoor units, lighting fixtures,
and ventilation fans / systems.
>59-1/16 inches
Indoor unit
Lighting
Ventilator
Indoor unit
>78-25/32 inches
>118-5/32 inches
•
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Installing in an Area Exposed to Unconditioned Air
In some installation applications, areas (floors, walls) in some rooms will be exposed to unconditioned air (room will be above or next to an
unheated garage or storeroom). To countermeasure:
• Verify that carpet is or will be installed (carpet will increase the temperature by three (3) degrees).
• Add insulation between the floor joists.
• Install radiant heat or another type of heating system to the floor.
INSTALLATION
Indoor Unit Location Selection