Outdoor
Condensing Unit
Air Handler
HVAC Supply
Dedicated Ultra-Aire 90 Return to A/C Supply
HVAC Return
Fresh Air Intake
(Optional)
Motorized
Damper
Indoor
Air Return
Ultra-Aire
Supply
Backdraft
Damper
Recommended Installation
Dedicated Return to HVAC Supply
• Create a separate return for the Ultra-Aire SD12
in a central area of the building.
• Duct the supply of the Ultra-Aire SD12 to the air
supply of the HVAC system with a backdraft damper.
• 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.
Outdoor
Condensing
Unit
A/C Return to A/C Supply
Air Handler
HVAC Supply
HVAC Return
Backdraft
Damper
Optional Check Damper
(no HVAC fan needed)
Fresh Air Intake
(Optional)
Motorized
Damper
Ultra-Aire
Supply
HVAC Return to HVAC Supply
• Check Damper should be in place between the Return and
Supply connections of the dehumidifier.
• If Check Damper is not in place, the HVAC fan must turn on
when the dehumidifier is in operation.
• 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.
Outdoor
Condensing
Unit
Air Handler
HVAC Supply
Dedicated Ultra-Aire 90 Return to A/C Retur
n
HVAC Return
Fresh Air Intake
(Optional)
Motorized
Damper
Indoor
Air Return
Ultra-Aire
Supply
Dedicated Return to HVAC Return
• Create a separate return for the Ultra-Aire SD12 in a central
area of the building.
• Installing the supply air from the Ultra-Aire SD12 in the
return of the HVAC system requires the HVAC fan to run
when the Ultra-Aire SD12 is operating.
• 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.
Air Handler
HVAC
Supply
A/C Return to A/C Return
HVAC Return
Fresh Air
Intake
(Optional)
Motorized
Damper
Optional Check Damper
(no HVAC fan needed)
Ultra-Aire
Supply
Outdoor
Condensing
Unit
HVAC Return to HVAC Return
• Check Damper should be in place between the Return and
Supply connections of the dehumidifier.
• If Check Damper is not in place, the HVAC fan must turn on
when the dehumidifier is in operation.
• 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.
(800) 533-7533 | www.Ultra-Aire.com
Rev 6/1/18
Alternative Installations
Ultra-Aire
™
SD12 Split Dehumidifier
