Ultra-Aire 70H User manual

The Ultra-Aire 70H is a whole house ventilating dehumidifier that
is integrated into the heating and cooling system to provide the
ultimate in comfort, health and property protection through:
• Dehumidification
• Fresh Air Ventilation (Optional)
• Air Filtration
TS-781 4/27/16
Installation Instructions
P/N: 4033730 Serial No.: Install Date:
Sold by:
HVAC Installer: Please Leave Manual for Homeowner
INSTALLATION BY A HVAC PROFESSIONAL IS RECOMMENDED
YEAR
FULL WARRANTY
YEAR
FULL WARRANTY

Safety Instructions ...................................................................... 3
Specifications .............................................................................. 4
Optional Accessories................................................................... 5
Dehumidifier Set Up .................................................................... 6
Attaching Duct Collars................................................................. 7
Electrical Requirements .............................................................. 8
Drain Installation ......................................................................... 9
Ducting to HVAC Systems.......................................................... 10
Recommended HVAC System Installations ........................................ 11
Alternative HVAC System Installations................................................ 12
Recommended Multiple HVAC Systems Installation .......................... 13
No Existing Ductwork Installation ....................................................... 14
Recommended Closet Installation ...................................................... 15
Alternative Closet Installations ............................................................ 16
Fresh Air Ventilation .................................................................. 17
Controls ..................................................................................... 19
Air Filtration............................................................................... 21
Service....................................................................................... 23
Warranty .................................................................................... 26
TABLE OF CONTENTS
Ultra-Aire is committed to manufacturing quality products. To maintain
our standards, product specifications may change without notice.
4201 Lien Rd. Madison, WI 53704
1-800-533-7533
www.Thermastor.com | www.Ultra-Aire.com
© 2015 Therma-Stor LLC

3
www.Ultra-Aire.com | 1-800-533-7533 Ultra-Aire 70H Installation Instructions
SAFETY INSTRUCTIONS
WARNING!
THIS SYMBOL MEANS IMPORTANT INSTRUCTIONS. FAILURE TO HEED THEM
CAN RESULT IN SERIOUS INJURY OR DEATH.
READ THE INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS CAREFULLY
BEFORE INSTALLING AND OPERATING THIS DEVICE. PROPER ADHERENCE TO THESE
INSTRUCTIONS IS ESSENTIAL TO OBTAIN MAXIMUM BENEFIT FROM YOUR ULTRA-AIRE
WHOLE HOUSE VENTILATING DEHUMIDIFIER.
CAUTION!
THIS SYMBOL MEANS IMPORTANT INSTRUCTIONS. FAILURE TO HEED THEM
CAN RESULT IN INJURY OR MATERIAL PROPERTY DAMAGE.
Registrations
The Ultra-Aire 70H conforms to unified standard UL 60335-2-40 and CSA Standard C22.2.60335-2-40.
CAUTION!
READ ALL INSTRUCTIONS BEFORE BEGINNING INSTALLATION.
ALWAYS USE CAUTION AND WEAR CUT RESISTANT GLOVES WHEN HANDLING SHEET
METAL.
IMPROPER INSTALLATION MAY CAUSE PROPERTY DAMAGE OR INJURY.
INSTALLATION, SERVICE, AND MAINTENANCE MUST BE PERFORMED BY A QUALIFIED
SERVICE TECHNICIAN.
DEHUMIDIFIER IS HEAVY. HANDLE WITH CARE AND FOLLOW INSTALLATION INSTRUCTIONS.
DO NOT USE IN POOL APPLICATIONS, OR WARRANTY WILL BE VOID.
NEVER OPERATE A UNIT WITH A DAMAGED POWER CORD. IF THE POWER CORD IS
DAMAGED, IT MUST BE REPLACED BY THE MANUFACTURER, ITS SERVICE AGENT, OR A
SIMILARLY QUALIFIED PERSON IN ORDER TO AVOID A HAZARD.
THIS APPLIANCE IS NOT INTENDED FOR USE BY PERSONS (INCLUDING CHILDREN) WITH
REDUCED PHYSICAL, SENSORY OR MENTAL CAPABILITIES, OR LACK OF EXPERIENCE
OR KNOWLEDGE, UNLESS THEY HAVE BEEN GIVEN SUPERVISION OR INSTRUCTION
CONCERNING THE USE OF THE APPLIANCE BY A PERSON RESPONSIBLE FOR THEIR
SAFETY. CHILDREN SHOULD BE SUPERVISED TO ENSURE THAT THEY DO NOT PLAY WITH
THE APPLIANCE.
WARNING!
120 VOLTS MAY CAUSE SERIOUS INJURY FROM ELECTRIC SHOCK.
DISCONNECT ELECTRICAL POWER BEFORE STARTING INSTALLATION OR
SERVICING, AND LEAVE POWER DISCONNECTED UNTIL INSTALLATION OR
SERVICE IS COMPLETED.

4Ultra-Aire 70H Installation Instructions www.Ultra-Aire.com | 1-800-533-7533
SPECIFICATIONS
Part Number: 4033730
Blower: 150 CFM @ 0.0" WG
140 CFM @ 0.2" WG
130 CFM @ 0.4" WG
Power: 580 Watts @ 80°F and 60% RH
Supply Voltage: 115 VAC – 1phase – 60 Hz
Current Draw: 5.1 Amps
Circuit Requirement: 15 Amps
Energy Factor: 2.4 L/kWh
Operating Range: 49°F Min, 95°F Max (Inlet Air Temperature)
Sized for: Up to 1,800 Sq. Ft. - Typical
Water Removal at 80°F and 60% RH Water Removal at 70°F and 60% RH
Capacity: 70 pints/day Capacity: 47 pints/day
Efficiency: 5.0 Pints/kWh Efficiency: 4.0 Pints/kWh
Duct Connections: 8" Round Inlet; 8" Round Outlet
Air Filter: MERV-11, Mini Pleat
Efficiency: 65% ASHRAE Dust Spot
Size: 9" x 11" x 1"
Optional Air Filter: MERV-14, Embossed Pleat (will need filter housing)
Efficiency: 95% ASHRAE Dust Spot
Size: 20" x 24" x 4"
Power Cord: 9', 115VAC, Ground
Drain Connection: 3/4" Threaded Female NPT
Refrigerant Type: R410A (Refer to manufacturers label for more information)
Refrigerant Amount: 15 oz.
Dimensions: Unit With Collars Unit Without Collars Shipping
Width: 12" 12" 15 5/8"
Height: 12" 12" 16"
Length: 28" 22" 31 5/8"
Weight: 55 lbs. 54 lbs. 65 lbs.
28"
With Collars Installed
22"
Without Collars Installed
12"
12"
Side ViewFront View Rear View
12"
12"
BACK
12”
12”
8"
8"
28”
22”
FRONT
12”
12”
8"
8"

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OPTIONAL ACCESSORIES
4028539 DEH 3000 Control
4028407 DEH 3000R Control (with remote)
4030671 MERV 11 Filter (14"x14"x1")
4030734 MERV 11 Filters 4-Pack
4030733 MERV 11 Filters 12-Pack
4030113 Pump Kit
4036695 Hang Kit
4025287 MERV 14 Filter Housing
4024370 MERV 14 Filter (20"x24"x4")
4029087 MERV 14 Filters 3-Pack
4023672 6" Motorized Damper
4026859 6" Flex Duct 25'
4020128 6" Flex Insulated Duct 25'
4020656 6" Inlet Hood
4023647 8" Gravity Damper
4020646 8" Butterfly Damper
4027415 8" Flex Duct 25'
4020177 8" Flex Insulated Duct 25'
Items Included in Box:
• Ultra-Aire 70H Dehumidifier
• Ultra-Aire 70H Installation Instructions
• Ultra-Aire 70H Leveling Feet

6Ultra-Aire 70H Installation Instructions www.Ultra-Aire.com | 1-800-533-7533
Important Precautions
• The device is designed to be installed indoors in a space that is protected from rain and flooding.
• Install the unit with enough space to access all sides for maintenance and service. The entire shell needs to be
removed in order to do repairs.
• Avoid directing the discharge air at people. The dehumidifier should be used in the upright position.
• If used near a water source; be certain there is no chance the unit could fall into the water or get splashed and
that it is plugged into a dedicated circuit and Ground Fault Circuit Interrupter (GFCI) protected outlet.
• DO NOT use the dehumidifier as a bench or table.
• DO NOT place the dehumidifier directly on structural building members without vibration absorbers or unwanted
noise may result. Place the Ultra-Aire 70H on supports to raise the base of the unit.
• A drain pan MUST be placed under the dehumidifier if installed above a living area or above an area where
water leakage could cause damage.
Location Considerations
• Allow sufficient clearance to handle the unit’s overall dimensions as well as the necessary return and supply
ductwork to the unit.
• Allow sufficient clearance for filter removal and to prevent airflow obstruction.
• Electrical service access will require the removal of the outside shell. Allow sufficient clearance around the unit.
• Locate the dehumidifier in an area where the cord’s lenght (9') easily reaches a 115 VAC electrical outlet with a
minimum of a 15 Amp circuit capacity.
• Locate the dehumidifier in an area where field wiring the control (low voltage) to the unit will be possible.
• It is recommended that a
backdraft damper be used in
the discharge duct of the
Ultra-Aire 70H, especially
when connecting to the supply
ducting system. The backdraft
damper prevents supply air
from counter flowing through
the Ultra-Aire 70H when it is
not operating. The dehumidifi-
er’s location should be chosen
to allow installation of this
accessory if necessary.
• The Ultra-Aire 70H may be
suspended with the hang kit
or a suitable alternative from
structural members,
ensuring the assembly
supports the dehumidifier’s
base in its entirety. DO NOT
hang the Ultra-Aire 70H from
its’ cabinet.
• Allow for proper drainage and
routing of needed drain pipes.
ELECTRICAL SERVICE
ACCESS THIS SIDE
6" MINIMUM CLEARANCE
FOR PROPER AIR FLOW
FILTER
9' POWER CORD
TOP VIEW
MINIMUM
CLEARANCE
FOR FILTER
(EITHER SIDE)
13"
B
B
RETURN AIR DUCT
SUPPLY AIR DUCT
A
B
C
A
DRAIN
ACCESS
DEHUMIDIFIER SET UP

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Fresh Air Ventilation Duct
Fresh air ventilation is optional. If setting up the unit to provide fresh air ventilation, see page 17.
Return Air Inlet
An 8” diameter duct collar is attached to the unit.
Supply Air Outlet
The back panel of the dehumidifier can be rotated to allow for horizontal flow through or vertical flow through
of the supply air.
• Horizontal Flow Through
The unit ships configured for a horizontal flow through. An 8" diameter duct collar is attached to the unit.
• Vertical Flow Through
Remove the exhaust panel. Rotate the panel so the exhaust collar is located on the top of the unit. Align screw
holes and snap the panel onto the base. Secure the exhaust panel to the base by replacing the six screws.
OUTLET DUCT
COLLAR WITH
BACK DRAFT
DAMPER
RETURN AIR
INLET DUCT
COLLAR
FRESH AIR
INLET DUCT
COLLAR
RETURN AIR
INLET DUCT
COLLAR
FRESH AIR
INLET DUCT
COLLAR
Front View
Horizontal Flow Through
(End Discharge)
AIR FLOW
Rear View
Vertical Flow Through
(Top Discharge)
8" Return Air Inlet
8" Supply Air Outlet
A
B
A
AB
A
8" Return Air Inlet
8" Supply Air Outlet
A
B
Top View
Front View
A
Rear View
B
B
Air Flow Air Flow
B
ATTACHING DUCT COLLARS
OUTLET DUCT
COLLAR WITH
BACK DRAFT
DAMPER
RETURN AIR
INLET DUCT
COLLAR
FRESH AIR
INLET DUCT
COLLAR
RETURN AIR
INLET DUCT
COLLAR
FRESH AIR
INLET DUCT
COLLAR
Front View
Horizontal Flow Through
(End Discharge)
AIR FLOW
Rear View
Vertical Flow Through
(Top Discharge)
8" Return Air Inlet
8" Supply Air Outlet
A
B
A
AB
A
8" Return Air Inlet
8" Supply Air Outlet
A
B
Top View
Front View
A
Rear View
B
B
Air Flow Air Flow
B

8Ultra-Aire 70H Installation Instructions www.Ultra-Aire.com | 1-800-533-7533
The Ultra-Aire 70H plugs into a common grounded 115VAC outlet. The device draws 5.1 Amps at 80°F and
60% RH. Locate the dehumidifier in an area where the cord’s length (9') easily reaches a 115 VAC electrical
outlet with a minimum of 15 Amp circuit capacity. If used in an area that may become wet, a GFCI protected
circuit is recommended. Consult local electrical codes for any further information.
Ultra-Aire offers a variety of control devices for use with the Ultra-Aire 70H. The controls are to be located
remotely from the dehumidifier and placed in the space to be conditioned. Low voltage (24 Volt) controls can be
used with the Ultra-Aire 70H and MUST be connected with low voltage (18-22 gauge) thermostat wire.
ELECTRICAL REQUIREMENTS
CAUTION!
DO NOT ALLOW THE YELLOW LEAD TO CONTACT THE RED LEAD ON THE ULTRA-AIRE 70H OR
DAMAGE TO THE TRANSFORMER WILL RESULT.
Electrical Precautions
• Do not install the control where it may not accurately sense the relative humidity such as near HVAC
supply registers, near exterior doors, on an outside wall, near a window, or near a water source.
• The control wires leaving the Ultra-Aire 70H and the control are numbered and color-coded to
prevent confusion.
• Be sure to consult the electrical schematic in the CONTROLS Section (page 21) of this manual or
inside the access panel of the Ultra-Aire 70H before making control connections.
WARNING!
THE REMOTE CONTROLS OF THE ULTRA-AIRE 70H ARE POWERED BY A LOW VOLTAGE CIRCUIT
(24VAC) AND MUST NEVER CONTACT OR BE CONNECTED TO A HIGH VOLTAGE CIRCUIT.
CAUTION!
SOME OF THE CONTROL WIRES LEAVING THE ULTRA-AIRE 70H MAY NOT BE USED WITH
CERTAIN CONTROLS AND SHOULD BE LEFT UNCONNECTED WITH WIRE NUTS TAPED ONTO
THE STRIPPED ENDS FOR SAFETY.
Wiring Schematic

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www.Ultra-Aire.com | 1-800-533-7533 Ultra-Aire 70H Installation Instructions
The Ultra-Aire 70H generates condensate.
Place a secondary drain pan under the dehumidifier if it is suspended above a finished area or above an
area where water leakage could cause damage.
A drain trap is required for the dehumidifier to run properly. Install a 3/4" threaded male NPT adapter to the
drain pan. Install a drain pipe assembly utilizing 3/4" PVC pipe to transport the condensate to a drain. Pitch
of drain should be 1" per 10'.
An optional condensate pump kit is available for use with the Ultra-Aire 70H and may be installed if lift is
required to dispose of condensate. Condensate is automatically pumped to a remote location when the
water level in the pump’s reservoir rises to close the float switch.
The pump also contains a safety float switch. The white leads from this switch extend from beneath the
pump cover. This switch should be installed in series with the field wire that connects to the common lead
from the Ultra-Aire 70H to the control panel. If the pump fails, this switch opens the common control circuit
and stops water production before the reservoir overflows. Contact a qualified electrician to install the safety
float switch to the Ultra-Aire 70H dehumidifier.
Note: An optional condensate pump kit can be purchased from a local dealer or online.
DRAIN INSTALLATION
Drain Installation
Front View
Secondary Drain Pan
Drain Port
Drain Trap

10 Ultra-Aire 70H Installation Instructions www.Ultra-Aire.com | 1-800-533-7533
The recommended installation creates a separate return for the Ultra-Aire 70H in a central area of the
structure. Duct the supply of the unit to the air supply of the existing HVAC system. Connect an insulated
duct from outside to provide fresh make-up air (optional).
DUCTING TO HVAC SYSTEMS
CAUTION!
DO NOT CONNECT WITH A STATIC PRESSURE GREATER THAN OR EQUAL TO +0.5 WG.
CONTACT TECHNICAL SUPPORT AT 1-800-533-7533 FOR ADDITIONAL DETAILS.
Ducting Considerations:
• All flexible ducting connected to the Ultra-Aire 70H should be UL listed.
• A short piece of flexible ducting on all Ultra-Aire 70H duct connections is recommended to reduce noise
and vibration transmitted to rigid ductwork in the structure.
• Use a minimum 8" diameter round or equivalent rectangular duct for total duct lengths of up to 25'. Use
a minimum 10" diameter or equivalent for longer lengths.
• Grills or diffusers on the duct ends must not excessively restrict airflow.
• A length of 8" or more of insulated flex duct or any other vibration isolating material on the outlet of the
Ultra-Aire 70H will reduce air noise from the blower.
• Effective dehumidification may require that ducting be branched to isolated, stagnant air flow areas.
When ducting to two or three areas, use 6" or larger diameter branch ducting. When ducting to four or
more areas, use 4"-6" or larger diameter branch ducting. Provisions must be made to provide airflow
from supply locations to the central return location. Proper air distribution is important to ensure even
humidity control and heat distribution throughout the structure.
• DO NOT locate the return in a bathroom or a kitchen.

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Indoor Air
Return
Backdraft
Damper
Dry Air to
Basement
Manual
Damper
Motorized
Damper
Fresh Air Intake
(Optional)
Basement / Crawlspace Intall
Air Handler Supply
Ultra-Aire Supply
Recommended HVAC System Installations
DUCTING TO HVAC SYSTEMS
The recommended installation pulls air from a dedicated indoor air return and ducts the supply of the
dehumidifier to the air supply of the existing HVAC system. Utilize the optional fresh air ventilation duct to
provide outside air.
• Install a dedicated 8" air return for the Ultra-Aire 70H from a central area of the structure.
• Duct the supply of the Ultra-Aire 70H to the supply of the existing HVAC system with a backdraft damper.
• If the existing system has multiple returns, instead of installing a dedicated return to the Ultra-Aire 70H, it
is possible to select one to disconnect from the existing HVAC system and use it for the dedicated
Ultra-Aire 70H return. Always select a return from a central location in the house that is always open to
the rest of the structure. DO NOT use a return from a room where doors are kept closed.
• DO NOT locate return in a bathroom or kitchen.
• Control should be located remotely from the dehumidifier and placed in a central location.
Ultra-Aire
Supply
Air Handler
HVAC Supply
Dedicated Ultra-Aire 70 Return to A/C Supply
HVAC Return
Indoor Air
Return
Fresh Air Intake (Optional)
Motorized Damper Backdraft
Damper
Attic Installation - Dedicated Ultra-Aire Return to HVAC Supply
Duct the supply of the Ultra-Aire 70H
to a 8” x 8” x 8” tee damper
that is 20 percent open to the
basement/crawlspace.
Basement/Crawlspace Installation - Dedicated Ultra-Aire Return to HVAC Supply

12 Ultra-Aire 70H Installation Instructions www.Ultra-Aire.com | 1-800-533-7533
Ultra-Aire
Supply
Air Handler
HVAC Supply
A/C Return to A/C Supply
HVAC Return
Backdraft
Damper
Fresh Air Intake
(Optional)
Motorized
Damper
Optional Check Damper
(no A/C fan needed)
HVAC Return to HVAC Supply
Ultra-Aire
Supply
Air Handler
HVAC
Supply
A/C Return to A/C Return
Indoor Air
Return
Optional Fresh Air Intake
HVAC Return
Motorized Damper Fresh Air Intake
(Optional)
Motorized
Damper
Optional Check Damper
(no A/C fan needed)
HVAC Return to HVAC Return
DUCTING TO HVAC SYSTEMS
Alternative HVAC System Installations
Air Handler
HVAC Supply
Dedicated Ultra-Aire 70 Return to A/C Return
HVAC Return
Ultra-Aire
Supply
Indoor Air
Return
Fresh Air Intake (Optional)
Motorized Damper
Dedicated Ultra-Aire Return to HVAC Return
If the Recommended Dedicated Ultra-Aire Return to HVAC Supply Installation is not possible, there are several
alternative installation options available.
• DO NOT locate return in a bathroom or kitchen.
• Control should be located remotely from the dehumidifier and placed in a central location.
• For basement and crawlspace installations, an optional tee can be installed on the Ultra-Aire 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.
Create a separate return for the
Ultra-Aire 70H in a central area of
the building.
Installing the supply air from the
Ultra-Aire 70H in the return of the
HVAC system requires the HVAC
fan to run when the Ultra-Aire
70H is operating.
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.

13
www.Ultra-Aire.com | 1-800-533-7533 Ultra-Aire 70H Installation Instructions
The Ultra-Aire 70H can be installed on multiple HVAC systems. Dehumidified air will be provided to both
HVAC systems for distribution throughout the structure.
• A backdraft damper is required in the supply ducts.
• DO NOT locate the return in a bathroom or kitchen.
• One control will service both HVAC zones. Control should be located remotely from the dehumidifiers and
placed in a central location.
• HVAC systems should be in close proximity for optimal air flow.
• For multiple systems, contact Technical Support at 1-800-533-7533.
DUCTING TO HVAC SYSTEMS
Recommended Multiple HVAC System Installation
HVAC
Supply
Ultra-Aire
Supply
Second Air Handler
Dedicated Ultra-Aire 90 Return to multi systems A/C Supply
HVAC Return
Backdraft
Damper
First Air HandlerHVAC Return HVAC
Supply
Backdraft
Damper
Indoor
Air Return
Fresh Air Intake
(Optional)
Motorized
Damper
Dedicated Ultra-Aire Return to Multiple HVAC Systems
CAUTION!
DO NOT CONNECT WITH A STATIC PRESSURE GREATER THAN OR EQUAL TO +0.5 WG.
CONTACT TECHNICAL SUPPORT AT 1-800-533-7533 FOR ADDITIONAL DETAILS.

14 Ultra-Aire 70H Installation Instructions www.Ultra-Aire.com | 1-800-533-7533
When installing the Ultra-Aire 70H in a structure that does not have a forced air HVAC system, a single
return for the Ultra-Aire 70H should be installed in a central location.
Install a 6" insulated duct from outside, teeing into the 8" return duct of the Ultra-Aire 70H to provide fresh
air ventilation (optional).
The supply of the Ultra-Aire 70H should be ducted to remote areas of the structure such as bedrooms, living
room, den, etc. Be sure to utilize multiple rooms to allow air inside the structure to properly circulate. Proper
air distribution is important to ensure even humidity control and heat distribution throughout the structure.
A 6" diameter duct is recommended for branches to bedrooms. An 8" diameter duct is recommended for
branches to larger areas.
• DO NOT locate the return in a bathroom or kitchen.
• DO NOT locate the supply in smaller rooms where doors may be closed.
• Control should be located remotely from the dehumidifier and placed in a central location.
Ultra-Aire
Air Supply
Indoor Air
Return
Optional Fresh
Air Intake
Motorized
Damper
DUCTING TO HVAC SYSTEMS
No Existing Ductwork Installation
No Existing Ductwork Installation

15
www.Ultra-Aire.com | 1-800-533-7533 Ultra-Aire 70H Installation Instructions
Due to space limitations, a closet installation may require additional considerations. Locate the dehumidifier
under or next to the HVAC system as space allows. A passive vent or louver door is required to allow air to
be pulled in from the living space.
• No inlet duct is required. Air is pulled through the louvers or grille from the living space.
• Install a 6" insulated duct from outside, teeing into the 8" return duct of the Ultra-Aire 70H to provide
fresh air ventilation (optional).
• Control should be placed in a central location or the on board control can be used for this installation.
• Where inlet space is restricted, the inlet duct collar is optional.
• Where outlet space is restricted, the outlet duct collar is optional or vertical flow through may be preferred.
HVAC
Supply
Backdraft
Damper
Ultra-Aire
Supply
HVAC
Return
Ultra-Aire
Return
Fresh Air Intake
(Optional)
DUCTING TO HVAC SYSTEMS
Recommended Closet Installation
WARNING!
WHEN INSTALLING THE DEHUMIDIFIER AS PART OF A COMBUSTION TYPE HVAC SYSTEM (GAS,
OIL, PROPANE, ETC.), FOLLOW ALL LOCAL AND NATIONAL BUILDING AND SAFETY CODES.
Central Return to HVAC Supply
Duct the supply of the Ultra-Aire 70H
to the supply of the existing HVAC
system with a backdraft damper.

16 Ultra-Aire 70H Installation Instructions www.Ultra-Aire.com | 1-800-533-7533
DUCTING TO HVAC SYSTEMS
Alternative Closet Installations
HVAC
Supply
Backdraft
Damper
Ultra-Aire
Supply
HVAC
Return
Ultra-Aire
Return
Central Return to HVAC Return
Duct the supply of the Ultra-Aire 70H
to the return side of the existing
HVAC system.
In a central return system, the
HVAC fan must run when the
dehumidifier is running.
HVAC
Supply
Ultra-Aire
Supply
HVAC
Return
Ultra-Aire
Return
No Duct - Central Return to HVAC Return
Attach outlet duct with a vertical
flow through so air is not
discharged into wall or other
obstruction. The HVAC system
will naturally pull dehumidified
air from the closet and distribute
throughout the structure. See
Page 7 for Vertical Flow Through.
If the Recommended Closet Installation is not possible, there are several alternative installation options available.
• No inlet duct is required. Air is pulled through the louvers or grille from the living space.
• Install a 6” insulated duct from outside, teeing into the 8” return duct of the Ultra-Aire 70H to provide fresh
air ventilation (optional).
• Control should be placed in a central location or the on board control can be used for this installation.

17
www.Ultra-Aire.com | 1-800-533-7533 Ultra-Aire 70H Installation Instructions
Fresh air ventilation is optional.
Fresh air may be brought into the structure by connecting an insulated duct from outside the structure to a
tee located in the inlet duct of the Ultra-Aire 70H. A ventilation control is needed to program the time and
frequency that the unit introduces outside air. The time and frequency of ventilation should be based on the
size and occupancy of the residence.
• The 6" fresh air ventilation duct should tee into the 8" round collar on the front of the Ultra-Aire 70H.
• An insulated 6" diameter duct provides up to 55 CFM of outside air.
• Performance of the Ultra-Aire 70H can be impacted by inside and outside air conditions.
• When a 6" motorized damper is used, a digital control is required.
• It may be necessary to use 8" duct work if additional fresh air is required.
• In cold climates or at times when the dew point is low, ventilation can be used to dehumidify the
structure, making the Ultra-Aire 70H capable of year-round drying.
FRESH AIR VENTILATION
B
Motorized Damper
6" Fresh Air Inlet
(Optional)
8" Return Air Inlet
8" Supply Air Outlet
A
B
C
Outdoor Air
90°F, 65%RH
Hot Climate
A
Mixed Air
75°F
65%RH
Mixed Air
75°F
65%RH
Indoor Air
70°F, 50%RH
B
C
Outlet Air
75°F, 65%RH
B
Motorized Damper
6" Fresh Air Inlet
(Optional)
8" Return Air Inlet
8" Supply Air Outlet
A
B
C
Outdoor Air
30°F, 65%RH
Cold Climate
A
Mixed Air
59°F
51%RH
Mixed Air
59°F
51%RH
Indoor Air
70°F, 50%RH
B
C
Outlet Air
59°F, 51%RH
Fresh Air Ventilation With Dehumidier Off and Fan Only Operation
Outside air mixes with return air prior to beginning the dehumidification process. Outside
and inside temperature and relative humidity will impact the combined outlet air conditions.

18 Ultra-Aire 70H Installation Instructions www.Ultra-Aire.com | 1-800-533-7533
Option 1: Calculating Airflow Requirement Using ASHRAE 62.2-2010 Airflow Equation
ASHRAE Airflow in CFM = [House Area in Sq.Ft. x 0.01] + [(Number of Bedrooms +1) x 7.5]
NOTE: Use ‘Number of Bedrooms + 1’ or ‘Number of Occupants’, whichever is larger.
Example 1: Number of Bedrooms + 1
1800 square foot house with 3 bedrooms, 4 occupants = [1800 X 0.01] + [(3+1) X 7.5] = 48 CFM
Example 2: Number of Occupants
1800 square foot house with 3 bedrooms, 5 occupants = [1800 X 0.01] + [5 X 7.5] = 55.5 CFM
Record the required CFM ____________
FRESH AIR VENTILATION
Determine Ventilation Requirements
The MINIMUM ventilation requirement is calculated using ASHRAE 62.2-2010. Use one or both of the options
below to determine your ventilation requirement. Follow all local and national building and safety codes.
Table 4.1 from ASHRAE 62.2-2010
Floor Area
(ft2)
< 1500 ft2
1501 - 3000
3001 - 4500
4501 - 6000
6001 - 7500
> 7500 ft2
0-1
30
45
60
75
90
105
2-3
45
60
75
90
105
120
4-5
60
75
90
105
120
135
6-7
75
90
105
120
135
150
>7
90
105
120
135
150
165
Number of Bedrooms
Option 2: Calculating Airflow Requirement Using Table 4.1 from ASHRAE 62.2-2010
See chart below to find the calculated airflow values to the nearest 5 CFM.
Record the required CFM ____________
Ventilation Air Requirements, CFM

19
www.Ultra-Aire.com | 1-800-533-7533 Ultra-Aire 70H Installation Instructions
A control can be used with the Ultra-Aire 70H. The Ultra-Aire 70H features a built-in dehumidistat control as well
as the ability to wire a remote mounted control to the unit. If the Ultra-Aire 70H is located outside of the area
where humidity control is desired, consider using a remote wired humidity controller that is located in the area
where humidity control is desired. If using the built-in dehumidistat to control the unit, locate the control in an
area where it can accurately sense the humidity of the area where humidity control is desired.
If the Ultra-Aire 70H is located in the area where humidity control is desired, consider using the built-in control.
Adjust the humidity control so that the unit maintains the desired level of humidity.
Ultra-Aire offers the DEH 3000 proprietary control. The DEH 3000 allows homeowners to monitor and control
relative humidity and proper ventilation levels in their home. This control is also available with a remote
sensing option.
Note: The DEH 3000 is sold seperately and can be purchased online or through your local dealer. Other
thermostats are compatible with the Ultra-Aire 70H.
CONTROLS
CAUTION!
DO NOT ALLOW THE YELLOW LEAD FROM THE ULTRA-AIRE 70H TO CONTACT THE RED
LEAD OR THE WHITE LEAD FROM THE ULTRA-AIRE 70H OR DAMAGE TO THE TRANSFORMERS
WILL RESULT.
DO NOT CONNECT THE WHITE WIRE TO THE CONTROL IF THE OPTIONAL DAMPER IS NOT
USED OR DAMAGE TO THE TRANSFORMER WILL RESULT.
Control Connections
The control and the control wires leaving the Ultra-Aire 70H are numbered and color-coded to prevent
confusion. Depending on the control, some of the wires leaving the Ultra-Aire 70H may not be used. For
safety, the unconnected wires should be covered with wire nuts. Be sure to consult the electrical schematic
in this manual or inside the access panel of the Ultra-Aire 70H before making control connections.
Wiring Controls
• Central Fan Integration – Operates HVAC
fan with dehumidifier operation.
• A/C Sensor – Automatically activates or
deactivates the dehumidifier when the air
conditioner runs.
• High Temperature Cut-Out – Disables
dehumidifier operations if household
temperature reaches the cut-out setpoint.
• Dry Out Cycle Timer – Automatic fan
cycling to ensure dry and clean coils.
• Auto Reboot – Resumes operation with
prior settings in the event of power failure.
Ultra-Aire DEH 3000 Digital Control
See DEH 3000 manual for detailed instructions.
CAUTION!
WHEN USING A REMOTE WIRED DEHUMIDISTAT, BE SURE THE BUILT-IN DEHUMIDISTAT IS SET
TO THE OFF POSITION BY TURNING IT COUNTERCLOKWISE UNTIL IT STOPS. FAILURE TO DO
SO MAY CAUSE THE UNIT TO SENSE THE HUMIDITY FROM THE WRONG AREA.

20 Ultra-Aire 70H Installation Instructions www.Ultra-Aire.com | 1-800-533-7533
CONTROLS
A low voltage control must be used with the Ultra-Aire 70H.
Basic Control Wiring
Control
Dehumidifier
Yellow
Yellow
Blue
Blue
Low Voltage
Wiring
Green (or brown) Fan control
Blue Dehumidication (fan and compressor) control
Red 24VAC power transformer neutral side (common with white)
White 24VAC power transformer neutral side (common with red)
Yellow Transformer high side
Five Color Coded Wires Control Operation.
Unit ON Make contact between yellow and blue wires
Unit OFF Make contact between yellow and green (or brown) wires
Power HVAC Accessory Connect the accessory to the white (or red) wire and the yellow wire
Between the red/white lead and the yellow lead is a 40VA transformer. This low voltage power source
powers the relay coils which control the fan and compressors. This 24VAC transformer can also be
used to power HVAC accessories external to the dehumidifier.
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