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Ultra-Aire SD12 Installer’s & Owner’s Manual
3.9E Installation in an Attic with an Existing Forced Air
HVAC System
Always install a catch pan with a drain and/or float interrupt switch for
condensate under the Ultra-Aire SD12 in an attic to reduce likelihood of
water damage.
Locate a separate return for the Ultra-Aire SD12 in a central area of
the structure. Duct the supply of the Ultra-Aire SD12 to the air supply
of the existing HVAC system. Connect an insulated duct from outside
to the 6” collar of the Ultra-Aire SD12 if you wish to provide fresh air
ventilation. Adjust damper in the collar to provide the desired amount
of fresh air. Using a remote control, program the unit to bring in the
desired amount of fresh air.
3.9F Installation in a Structure with Two Forced Air HVAC
Systems
The Ultra-Aire SD12 can be installed into two typical HVAC ducting
systems. Install a separate return for the Ultra-Aire SD12 as directed
above. Discharge air from the dehumidifier should be split and routed
to each supply ducting system. A balancing damper and a backdraft
damper is required in each duct between the Ultra-Aire SD12 and the
HVAC ducting system. This allows airflow to be adjusted and prevents
flow of air between the ducting systems. Contact the factory for as-
sistance, if necessary.
IMPORTANT!
INSULATED SUPPLY AND RETURN
DUCTS MUST BE USED WHEN INSTALLING THE ULTRA-AIRE SD12
DEHUMIDIFIER IN UNCONDITIONED SPACES TO PREVENT WATER
CONDENSATION ON THE DUCTING. THE ULTRA-AIRE SD12 DEHU-
MIDIFIER WILL REDUCE THE SUPPLY AIR TEMPERATURE 5°F TO
10°F BELOW THE RETURN AIR TEMPERATURE AND PROPERLY
FOR HVAC INSTALLER ONLY
INSULATING THE SUPPLY DUCT IS NECESSARY.
3.9G Installation in a Structure with No Existing Forced
Air HVAC System
When installing the Ultra-Aire SD12 in a structure that does not have
a forced air HVAC system, a single return for the Ultra-Aire SD12
should be installed in central open area of the structure. DO NOT
locate the return in a bathroom or a kitchen. The supply of the
Ultra-Aire SD12 should be located in the remote areas of the struc-
ture (such as bedrooms, den, etc.). By ducting this way, the air inside
the structure will circulate through the Ultra-Aire SD12 to be filtered
and dehumidified. Avoid discharging all the air from the dehumidifier
in one location to prevent overcooling that area. 4” diameter duct
is recommended for branches to the bedrooms, 6” diameter duct is
recommended for branches to larger areas. Refer to section 3.9B for
branch duct sizing.
Connect an insulated duct from outside to the 6” collar of the
Ultra-Aire SD12 if you wish to provide fresh air ventilation.
3.10 Quiet Installation
Consider fan vibration and airflow noise during installation. Use of flex
duct and/or vibration isolation materials during mounting and ducting
will result in quieter operation.
A length of flexible ducting on all Ultra-Aire SD12 duct connections is
recommended to reduce noise and vibration transmitted to rigid
ductwork in the structure.
3.11 System Start Up
1. Rotate the condensing unit fan to check for binding.
2. Inspect all factory and field wiring for loose connections.
3. Check the voltage supply at the condensing unit disconnect switch
and make sure it is 120Vac ±10%. If the supply voltage is outside
this range, do not start the system and repair the power supply
circuit.
4. Plug in the dehumidifier and set the remote control to dehumidify.
Close the condensing unit disconnect to start the condensing unit.
5. Recheck the voltage supply at the condensing unit and make sure
it is 120Vac ±10% while the unit is operating.
6. Check the condensing unit and dehumidifier operation.
4. Controls
The Ultra-Aire SD12 can be equipped with various accessories to
enhance its operation. A remote control must be used with the
Ultra-Aire SD12 system. Therma-Stor offers the DEH 3000 proprietary
controller. The DEH 3000 allows homeowners the ability to moni-
tor and control relative humidity levels in their home. This control is
also offered with a remote sensing option. Refer to Section 3.2B for
Control Installation.
Indoor
Air Supply
UA Indoor
Air Return
UA Supply
Backdraft
Damper
Secondary Drip Pan
Motorized
Damper
DEH 3000
Digital Control
Power Supply
120VAC
Heating & A/C Unit
Fresh Air
Intake
(optional)
Indoor Air
Return
Outdoor
Condensing
Unit
FIGURE 14B: DEHUMIDIFIER ATTIC INSTALL
Содержание SD12
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