32
Multi F Ceiling Cassette Indoor Unit
Due to our policy of continuous product innovation, some specifications may change without notification.
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4. Special Unconditioned Location: If conditions 1 and 2 below are present.
1. An unconditioned space or plenum of a building.
2. An area where there is an elevated humidity level.
5. Additional Insulation for Indoor Units Will be Required in Humid Environments.
The air conditioner factory insulation has been tested according to “ISO Conditions with Mist,” and it satisfies the requirements. If the system
has been operating for a long time in a high humidity environment (dew point temperature: more than 73°F), condensate is likely to form. If
this happens, install 3/8 inch thick EPDM insulation that is plenum-rated with a heat-resistance factor of more than 248°F.
3. Typical Unconditioned Location
When piping passes through an indoor area where the indoor unit does not operate, such as a hallway, dormitory, or school, etc. An uncondi-
tioned space inside a building.
GENERAL INSTALLATION GUIDELINES
Insulating Refrigerant Piping
1. Typical Air-Conditioned Location
A building plenum or space that contains conditioned air that does not exceed 80°F DB. When piping passes through an indoor area where
the indoor unit operates, such as an apartment, classroom, office, mall, hospital, etc.
2. Special Air-Conditioned Location
1. When the location is air conditioned, but there is severe temperature/humidity difference due to high ceilings.
• Church, auditorium, theater, lobby, etc.
2. When the location is air conditioned, but internal temperature/humidity are high.
• Bathroom, swimming pool, locker room, etc.
1
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Air-conditioned location
Non-air conditioned location
1. Typical Conditioned
Location
2. Special Conditioned
Location
3. Typical Unconditioned
Location
4. Special Unconditioned
Location
Liquid pipe
ø1/4 inch
>1/2 inches
>1/2 inches
>1/2 inches
>1/2 inches
ø3/8 inch
¡LQFK
>1/2 inches
>1/2 inches
>1/2 inches
>1/2 inches
Vapor pipe
ø3/8 inch
>1/2 inches
>3/4 inches
>3/4 inches
>1 inch
ø1/2 inch
ø5/8 inch
ø3/4 inch
ø7/8 inch
ø1 inch
ø1-1/8 inches
>3/4 inches
ø1-1/4 inches
>1 inch
>1 inch
ø1-3/8 inches
ø1-1/2 inches
ø1-3/4 inches
Table 19: Insulation Guidelines for Typical and Special Circumstances.
Minimum Refrigerant Pipe Ethylene Propylene Diene Methylene (EPDM) Insulation Wall Thickness Requirements
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