Ultra-Aire 98H User manual
The Ultra-Aire 98H 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-1037 12/17 Rev A
P/N: 4034240 Serial No.: Install Date:
Sold by:
HVAC Installer: Please Leave Manual for Homeowner
98H
Installation Instructions
INSTALLATION BY A HVAC PROFESSIONAL IS RECOMMENDED
YEAR
FULL WARRANTY
YEAR
FULL WARRANTY
Safety Instructions ...................................................................... 3
Specifications .............................................................................. 4
Optional Accessories................................................................... 5
Removal of Compressor Shipping Support .................................. 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
Determine Ventilation Requirements................................................... 18
Controls ..................................................................................... 19
Wiring Controls.................................................................................... 19
Air Filtration............................................................................... 21
MERV Rating Chart ............................................................................. 22
Service....................................................................................... 23
Troubleshooting .................................................................................. 24
Warranty .................................................................................... 27
TABLE OF CONTENTS
Ultra-Aire is committed to manufacturing quality products. To maintain
our standards, product specifications may change without notice.
4201 Lien Road, Madison, WI 53704
(800) 533-7533
www.Thermastor.com | www.Ultra-Aire.com
© 2015 Therma-Stor LLC
3
www.Ultra-Aire.com | (800) 533-7533 Ultra-Aire 98H 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 98H 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 98H Installation Instructions www.Ultra-Aire.com | (800) 533-7533
SPECIFICATIONS
Part Number: 4034240
Blower: 320 CFM @ 0.0" WG
297 CFM @ 0.2" WG
215 CFM @ 0.4" WG
Power: 670 Watts @ 80°F and 60% RH
Supply Voltage: 115 VAC – 1phase – 60 Hz
Current Draw: 5.9 Amps
Transformer Protection: Push Button Reset (located near power cord)
Circuit Requirement: 15 Amps
Energy Factor: 2.95 L/kWh
Operating Range: 49°F Min, 95°F Max (Inlet Air Temperature)
34°F Min, 135°F Max (Outside Cabinet)
Sized For: Up to 2,300 Square Feet
Water Removal at: 80°F and 60% RH 70°F and 60% RH
Capacity: 98 Pints/Day 75 Pints/Day
Efficiency: 6.1 Pints/kWh 5.4 Pints/kWh
Duct Connections: 6" Round Inlet; 10" Round Inlet; 10" Round Outlet
Air Filter: MERV-13, Mini Pleat
Efficiency: 90% ASHRAE Dust Spot
Size: 14" x 17.5" x 1.75"
Optional Air Filters:
MERV-11, Mini Pleat
Efficiency: 65% ASHRAE Dust Spot
Size: 14" x 17.5" x 1.75"
MERV-14, Embossed Pleat (will need filter housing)
Efficiency: 95% ASHRAE Dust Spot
Size: 20" x 24" x 4"
Power Cord: 9', 115VAC, Ground
Internal Insulated Cabinet: Yes
Drain Connection: 3/4" Threaded Female NPT
Refrigerant Type: R410A (Refer to manufacturers label for more information.)
Refrigerant Amount: 1 lb. 9 oz.
Dimensions: Unit With Collars Unit Without Collars Shipping
Width: 14 1/2" 14 1/2" 23"
Height: 19 1/2" 19 1/2" 30"
Length: 32 3/8" 26" 40"
Weight: 81 lbs. 80 lbs. 95 lbs.
Side ViewFront View Rear View
32 3/8"
With Collars Installed
26"
Without Collars Installed
14 1/2"
19 1/2"
14 1/2"
19 1/2"
6" Diameter
10" Diameter
10" Diameter
5
www.Ultra-Aire.com | (800) 533-7533 Ultra-Aire 98H Installation Instructions
OPTIONAL ACCESSORIES
4028539 DEH 3000 Control
4028407 DEH 3000R Control (with remote)
4037722 MERV-13 Filter (14" x 17.5" x 1.75")
4037731 MERV-13 Filters 4-Pack
4037732 MERV-13 Filters 12-Pack
4035319 MERV-11 Filter (14" x 17.5" x 1.75")
4035131 MERV-11 Filters 4-Pack
4035132 MERV-11 Filters 12-Pack
4025287 MERV-14 Filter Housing
4024370 MERV-14 Filter (20" x 24" x 4")
4029087 MERV-14 Filters 3-Pack
4033038 Pump Kit
4036695 Hang Kit
4023672 6" Motorized Damper
4026859 6" Flex Duct 25'
4020128 6" Flex Insulated Duct 25'
4020656 6" Inlet Hood
4024375 10" Gravity Damper
4026969 10" Flex Duct 25'
4022126 10" Flex Insulated Duct 25'
Items Included in Box:
• Ultra-Aire 98H Dehumidifier
• Ultra-Aire 98H Installation Instructions
• Ultra-Aire 98H Leveling Feet
Removal of Compressor Shipping Support
The Ultra-Aire 98H uses a compressor to power the
refrigeration system. To protect the compressor and
refrigeration system during shipping, a plastic tie wrap
secures it to the unit’s frame. Remove the tie wrap by
cutting the tie wrap and pulling from the unit as shown.
After removing tie wrap, insert plastic plugs provided
into the holes.
CAUTION!
REMOVE COMPRESSOR SHIPPING TIE FROM THE UNIT. FAILURE TO REMOVE SHIPPING TIE
WILL CAUSE EXCESS VIBRATION TO BE TRANSMITTED TO THE FRAME.
6Ultra-Aire 98H Installation Instructions www.Ultra-Aire.com | (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 one of the side panels for maintenance and service.
• 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 98H on supports to raise the base of the unit.
• A drain pan with a float switch 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 a side panel. Allow sufficient clearance on a side of the unit.
• Locate the dehumidifier in an area where the cord’s length (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 98H, especially
when connecting to the supply ducting
system. The backdraft damper prevents
supply air from counter flowing through
the Ultra-Aire 98H when it is not
operating. The dehumidifier’s location
should be chosen to allow installation
of this accessory if necessary.
• The Ultra-Aire 98H may be suspended
from structural members with steel
hanger straps or a suitable
alternative, ensuring the assembly
supports the dehumidifier’s base in
its entirety. DO NOT hang the
Ultra-Aire 98H from its cabinet.
• Allow for proper routing and drainage
of needed drain pipes.
Electrical Service Access
(Either Side)
Filter 9' Power Cord
Top View
Minimum
Clearance
For Filter
(Either Side)
15"
6" Fresh Air Intake (Optional)
10" Return Air Duct
10" Supply Air Duct
A
B
C
32 3/8"
With Collars Installed
26"
Without Collars Installed
B
C
Drain Port
A
DEHUMIDIFIER SET UP
7
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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
Air
Flow
Rear View
Vertical Flow Through
(Top Discharge)
6" Fresh Air Inlet (Optional)
10" Return Air Inlet
10" Supply Air Outlet
A
B
C
A
B
C
A
B
C
Top View
C
6" Fresh Air Inlet (Optional)
10" Return Air Inlet
10" Supply Air Outlet
A
B
C
A
B
C
Air
Flow
Rear ViewFront View
A
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
Air
Flow
Rear View
Vertical Flow Through
(Top Discharge)
6" Fresh Air Inlet (Optional)
10" Return Air Inlet
10" Supply Air Outlet
A
B
C
A
B
C
A
B
C
Top View
C
6" Fresh Air Inlet (Optional)
10" Return Air Inlet
10" Supply Air Outlet
A
B
C
A
B
C
Air
Flow
Rear ViewFront View
A
B
Fresh Air Ventilation Duct
Fresh air ventilation is optional. A 6" diameter duct is attached to the unit. The 6" duct should be capped if
fresh air is not desired. If setting up the unit to provide fresh air ventilation, see page 17.
Return Air Inlet
A 10" 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. A 10" diameter duct collar is attached to the unit.
• Vertical Flow Through
Remove the exhaust panel using a T25 torx bit.. 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.
8Ultra-Aire 98H Installation Instructions www.Ultra-Aire.com | (800) 533-7533
The Ultra-Aire 98H plugs into a common grounded 115 VAC outlet. The device draws 5.9 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 further information.
Ultra-Aire offers a variety of control devices for use with the Ultra-Aire 98H. The control is to be located
remotely from the dehumidifier and placed in the space to be conditioned. A low voltage (24 Volt) control MUST
be used with the Ultra-Aire 98H and MUST be connected with low voltage (18-22 gauge) thermostat wire.
ELECTRICAL REQUIREMENTS
CAUTION!
DO NOT ALLOW THE 24V TERMINAL TO CONTACT THE COM/DMPR TERMINALS ON THE
ULTRA-AIRE 98H 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 screw terminals on the Ultra-Aire 98H and
the control are labeled to prevent confusion.
• Be sure to consult the electrical schematic in the
CONTROLS Section (page 20) of this manual or
inside the access panel of the Ultra-Aire 98H
before making control connections.
WARNING!
THE REMOTE CONTROLS OF THE ULTRA-AIRE 98H ARE POWERED BY A LOW VOLTAGE CIRCUIT
(24 VAC) AND MUST NEVER CONTACT OR BE CONNECTED TO A HIGH VOLTAGE CIRCUIT.
CAUTION!
SOME OF THE SCREW TERMINALS ON THE ULTRA-AIRE 98H MAY NOT BE USED WITH
CERTAIN CONTROLS AND SHOULD BE LEFT UNCONNECTED.
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The Ultra-Aire 98H generates condensate.
Place a secondary drain pan with a float switch 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 drain 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 98H 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 98H 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 98H dehumidifier.
Note: An optional condensate pump kit can be purchased through your dealer or online.
DRAIN INSTALLATION
Drain Installation
Drain
Trap
Secondary
Drain Pan
Drain
Port
Drain Trap
Secondary Drain Pan
Drain Port
Drain
Trap
Secondary
Drain Pan
Drain
Port
Drain Trap
Secondary Drain Pan
Drain Port
10 Ultra-Aire 98H Installation Instructions www.Ultra-Aire.com | (800) 533-7533
The recommended installation creates a separate return for the Ultra-Aire 98H 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 the 6" collar of the Ultra-Aire 98H to provide fresh make-up air.
DUCTING TO HVAC SYSTEMS
CAUTION!
DO NOT CONNECT WITH A STATIC PRESSURE GREATER THAN OR EQUAL TO +0.5 WG.
CONTACT TECHNICAL SUPPORT AT (800) 533-7533 FOR ADDITIONAL DETAILS.
Ducting Considerations:
• All flexible ducting connected to the Ultra-Aire 98H should be UL listed.
• A short piece of flexible ducting on all Ultra-Aire 98H duct connections is recommended to reduce noise
and vibration transmitted to rigid ductwork in the structure.
• Use a minimum 10" diameter round or equivalent rectangular duct for total duct lengths of up to 25'. Use
a minimum 12" diameter round or equivalent rectangular duct for longer lengths.
• Grills or diffusers on the duct ends must not excessively restrict airflow.
• A length of 10" or more of insulated flex duct or any other vibration isolating material on the outlet of the
Ultra-Aire 98H 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 8" or larger diameter branch ducting. When ducting to four or
more areas, use 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.
11
www.Ultra-Aire.com | (800) 533-7533 Ultra-Aire 98H Installation Instructions
Dry Air to
Basement
Manual Damper
Basement / Crawlspace Intall
Air Handler Supply
Indoor
Air Return
Ultra-Aire Supply
Fresh Air
Intake (Optional) Motorized
Damper
Backdraft Damper
Recommended HVAC System Installation
DUCTING TO HVAC SYSTEMS
The recommended installation draws 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 10" air return for the Ultra-Aire 98H from a central area of the structure.
• Install an insulated duct from outside to the 6" collar of the Ultra-Aire 98H to provide fresh air
ventilation (optional).
• Duct the supply of the Ultra-Aire 98H 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 98H, it
is possible to select one to disconnect from the existing HVAC system and use it for the dedicated
Ultra-Aire 98H return. 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 90 Return to A/C Supply
HVAC Return
Fresh Air Intake
(Optional)
Motorized
Damper
Indoor
Air Return
Backdraft
Damper
Attic Installation - Dedicated Ultra-Aire Return to HVAC Supply
Duct the supply of the Ultra-Aire 98H
to a 10" x 10" x 10" tee damper
that is 20 percent open to the
basement/crawl space.
Basement/Crawl Space Installation - Dedicated Ultra-Aire Return to HVAC Supply
Note: Therma-Stor does not
recommend positive pressure
of crawl space applications.
This could potentially bring
contaminated air into living
spaces. The recommended
application is to achieve neutral
pressure in crawl spaces.
12 Ultra-Aire 98H Installation Instructions www.Ultra-Aire.com | (800) 533-7533
A/C Return to A/C Supply
Ultra-Aire
Supply
Air Handler
HVAC Supply
HVAC Return
Backdraft
Damper
Optional Check Damper
(no HVAC fan needed)
Fresh Air Intake
(Optional)
Motorized
Damper
HVAC Return to HVAC Supply
Ultra-Aire
Supply
Air Handler HVAC
Supply
A/C Return to A/C Return
HVAC Return
Optional Check Damper
(no HVAC fan needed)
Fresh Air
Intake
(Optional) Motorized
Damper
HVAC Return to HVAC Return
DUCTING TO HVAC SYSTEMS
Alternative HVAC System Installations
Ultra-Aire
Supply
Air Handler
HVAC Supply
Dedicated Ultra-Aire 90 Return to A/C Return
HVAC Return
Fresh
Air Intake
(Optional) Motorized
Damper
Indoor
Air Return
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 crawl space 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 98H in a central area of
the building.
Installing the supply air from the
Ultra-Aire 98H to the return of the
HVAC system requires the HVAC
fan to run when the Ultra-Aire 98H
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 | (800) 533-7533 Ultra-Aire 98H Installation Instructions
The Ultra-Aire 98H can be installed on multiple HVAC systems. Dehumidified air will be provided to both
HVAC systems for distribution throughout the structure.
• Backdraft dampers are 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 (800) 533-7533.
DUCTING TO HVAC SYSTEMS
Recommended Multiple HVAC Systems 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
Fresh Air Intake
(Optional)
Motorized
Damper
Indoor
Air Return
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 (800) 533-7533 FOR ADDITIONAL DETAILS.
14 Ultra-Aire 98H Installation Instructions www.Ultra-Aire.com | (800) 533-7533
When installing the Ultra-Aire 98H in a structure that does not have a forced air HVAC system, a single
return for the Ultra Aire 98H should be installed in a central location.
Install an insulated duct from outside to the 6" collar of the Ultra-Aire 98H to provide fresh air
ventilation (optional).
The supply of the Ultra-Aire 98H 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 rooms where doors may be closed.
• Control should be located remotely from the dehumidifier and placed in a central location.
Ultra-Aire
Supply
Fresh Air Intake
(Optional)
Motorized
Damper
Indoor Air
Return
DUCTING TO HVAC SYSTEMS
No Existing Ductwork Installation
No Existing Ductwork Installation
15
www.Ultra-Aire.com | (800) 533-7533 Ultra-Aire 98H 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 passive vent or louver door from the living space.
• Install an insulated duct from outside to the 6" collar of the Ultra-Aire 98H to provide fresh air
ventilation (optional).
• Control should be located remotely from the dehumidifier and placed in a central location.
• 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 98H
to the supply of the existing HVAC
system with a backdraft damper.
16 Ultra-Aire 98H Installation Instructions www.Ultra-Aire.com | (800) 533-7533
DUCTING TO HVAC SYSTEMS
Alternative Closet Installations
HVAC
Supply
Backdraft
Damper
Ultra-Aire
Supply
HVAC
Return
Fresh Air Intake
(Optional)
Ultra-Aire
Return
Central Return to HVAC Return
Duct the supply of the Ultra-Aire 98H
to the return side of the existing
HVAC system.
The HVAC fan must run when the
dehumidifier is running.
HVAC
Supply
Ultra-Aire
Supply
HVAC
Return
Fresh Air Intake
(Optional)
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 (see Page 7 for Vertical
Flow Through). The HVAC system
will naturally pull dehumidified
air from the closet and distribute
throughout the structure.
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 passive vent or louver door from the living space.
• Install an insulated duct from outside to the 6" collar of the Ultra-Aire 98H to provide fresh air ventilation
(optional).
• Control should be located remotely from the dehumidifier and placed in a central location.
17
www.Ultra-Aire.com | (800) 533-7533 Ultra-Aire 98H 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
the 6" inlet of the Ultra-Aire 98H. 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 fresh air ventilation duct should be connected to the 6" round collar on the front of the Ultra-Aire 98H.
• An insulated 6" diameter duct provides up to 75 CFM of outside air.
• If a motorized damper is not being used, fresh air is controlled by the manual damper in the 6” collar of the
Ultra-Aire 98H.
• Performance of the Ultra-Aire 98H 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 98H capable of year-round drying.
FRESH AIR VENTILATION
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
AIR FLOW
Air
Flow
Outdoor Air
90°F, 65%RH
Indoor Air
70°F, 50%RH
Mixed Air
75°F
65%RH
Mixed Air
75°F
65%RH
Outlet Air
75°F, 65%RH
Hot Climate
6" Fresh Air Inlet
(Optional)
10" Return Air Inlet
10" Supply Air Outlet
A
B
C
A
B
C
Outdoor Air
30°F, 65%RH
Indoor Air
70°F, 50%RH
Outlet Air
59°F, 51%RH
Cold Climate
A
B
C
6" Fresh Air Inlet
(Optional)
10" Return Air Inlet
10" Supply Air Outlet
A
B
C
Mixed Air
59°F
51%RH
Mixed Air
59°F
51%RH
Fresh Air Ventilation With Dehumidier O and Fan Only Operation
Outside air mixes with the dehumidifier’s return air before being supplied to the home. Outside
temperature, inside temperature and relative humidity will impact the combined outlet air conditions.
Note: Temperature and relative humidity may vary depending on duct distribution scheme.
18 Ultra-Aire 98H Installation Instructions www.Ultra-Aire.com | (800) 533-7533
Option 1: Calculating Airflow Requirement Using ASHRAE 62.2-2016 Airflow Equation
ASHRAE Airflow in CFM = [House Area in Sq.Ft. x 0.03] + [(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 0.03] + [(3+1) X 7.5] = 84 CFM
Example 2: Number of Occupants
1800 square foot house with 3 bedrooms, 5 occupants = [1800 X 0.03] + [5 X 7.5] = 91.5 CFM
Record the required CFM ____________
FRESH AIR VENTILATION
Determine Ventilation Requirements
The MINIMUM ventilation requirement is calculated using ASHRAE 62.2-2016. Use one or both of the options below
to determine your ventilation requirement. Follow all local and national building and safety codes.
Floor Area
(ft2)
< 500
501 - 1000
1001 - 1500
1501 - 2000
2001 - 2500
2501 - 3000
1
30
45
60
75
90
105
2
38
53
68
83
98
113
3
45
60
75
90
105
120
4
53
68
83
98
113
128
5
60
75
90
105
120
135
Number of Bedrooms
Option 2: Calculating Airflow Requirement Using Table 4.1 from ASHRAE 62.2-2016
Record the required CFM ____________
Ventilation Air Requirements, CFM
Table 4.1 from ASHRAE 62.2-2016
19
www.Ultra-Aire.com | (800) 533-7533 Ultra-Aire 98H Installation Instructions
A control must be used with the Ultra-Aire 98H. 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 through your local dealer or online. Other
thermostats are compatible with the Ultra-Aire 98H.
CONTROLS
CAUTION!
DO NOT ALLOW THE 24V TERMINAL FROM THE ULTRA-AIRE 98H TO CONTACT THE COM/DMPR
TERMINALS FROM THE ULTRA-AIRE 98H OR DAMAGE TO THE TRANSFORMERS WILL RESULT.
DO NOT CONNECT THE COM TERMINAL TO THE CONTROL IF THE OPTIONAL DAMPER IS NOT
USED OR DAMAGE TO THE TRANSFORMER WILL RESULT.
Circuit Breaker
To prevent damage to the 24 volt control transformer, the Ultra-Aire 98H
comes with a resettable circuit breaker. Check wiring for any electrical short
and repair before resetting breaker. Resetting the circuit breaker without
correcting the electrical short may result in transformer damage. Be sure to
check the electrical schematic in this manual or inside the access panel of
the Ultra-Aire 98H before making any control connections. The reset button
for the circuit breaker can be found on the back of the unit.
Control Connections
The control and the screw terminals on the Ultra-Aire 98H are labeled
to prevent confusion. Depending on the control, some of the screw
terminals on the Ultra-Aire 98H may not be used. Be sure to consult
the electrical schematic in this manual or inside the access panel of the
Ultra-Aire 98H before making control connections.
• 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
Wiring Controls
See DEH 3000 manual for detailed instructions.
Rear View
Circuit Breaker Reset Button
20 Ultra-Aire 98H Installation Instructions www.Ultra-Aire.com | (800) 533-7533
CONTROLS
Ultra-Aire Wired to the DEH 3000 Digital
Control (Part # 4028539)
COM
FAN
24V
DEHU
*
DMPR
24V AC
COMP FAN
Ultra-Aire Wired to the Remote Dehumidistat
(Part # 4020175)
COM
FAN
24V
DEHU
*
DMPR
RED
A low voltage control must be used with the Ultra-Aire 98H.
COM 24VAC Power Transformer Neutral Side
FAN Fan Control
24V Transformer High Side
DEHU Dehumidication (Fan and Compressor) Control
DMPR 24VAC Power Transformer Neutral Side
* Spare Terminal (Open)
Terminal Block Control Operation:
Unit ON Make contact between 24V and DEHU terminals
Unit OFF Make contact between 24V and FAN terminals
Power HVAC Accessory Connect the accessory to the DMPR (or COM) and 24V terminals
Between the COM/DMPR lead and the 24V TERMINAL 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.
NOTE: 18 gauge wire needed between the Ultra-Aire 98H dehumidifier and the external control.
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