Ultra-Aire SD12 Attic Installation (Alternate Install Options)

1. The indoor air return should come from an open area on the first floor or main level of the home / building.
2. The Ultra-Aire supply can be ducted into the forced air system downstream of the air conditioning coil. The duct connection should be perpendicular to the air flow. You may also run an independent supply directly from the dehumidifier into a large open room. Depending on the application, multiple returns and or supplies may be needed.
3. The optional six inch fresh air intake should be located at least six feet away from any exhaust ports, such as, dryer, range hood, or combustion device exhaust. Intake location should be consistent with local codes.
4. A section of flex duct or vibration absorbing duct should be located between the connections of the Ultra-Aire ductwork and the forced air system ductwork. (When ducting into the forced air systems)
5. A back draft damper should be installed when ducting into the forced air system. This prevents counter-flow of the A/C supply air through the UA SD12. A back draft damper is not needed when ducted independently.
6. If placed over a finished area, a secondary drip pan is recommended
7. Place condensing unit outside of the structure on a level pad (or bracket). If placed on a roof, vibration dampening material may be used.
8. Install a dedicated 120VAC branch circuit for the condensing unit.
9. Supply a line set suitable for use with R410A refrigerant to connect the indoor unit to the outdoor unit. The maximum allowable length of the line set is 50 feet. Braze the lines to the dehumidifier and the condensing unit.

Please Note: Therma-Stor does not recommend drawing air from the return ducting system and discharging into the supply, because it could reduce the capacity and may cause counterflow through the air conditioning unit. Preferred installation is to draw air from a separate return duct located in the central part of the home. Duct the outlet air into the supply duct for distribution throughout the home. A backdraft damper prevents air from the supply duct from being pushed backward through the Ultra-Aire SD12 when central (A/C) fan is on and the Ultra-Aire fan is off.