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INSTALLER’S & OWNER’S MANUAL
HVAC INSTALLER: PLEASE LEAVE MANUAL FOR HOMEOWNER
The Ultra-Aire 90H dehumidifier performs multiple functions in
a compact enclosure; high-capacity dehumidification, fresh air
ventilation, and particulate filtration.
Dehumidification
The highly efficient UA-90H dehumidifier utilizes refrigeration to cool
the incoming air stream below its dew point. This cooled and drier
air is used to pre-cool the incoming air stream resulting in increased
overall efficiency. After the pre-cooling stage the processed air is
reheated by passing through the condenser coil. The heat removed
by the evaporator coil is returned to the air stream, resulting in an
overall temperature increase from the incoming air.
P/N 4025700 • Serial No.________________________ Install Date:___________
Sold by:
Fresh Air Ventilation (optional)
Fresh air may be ducted to the unit and regulated by a variety of
controls in order to provide desired ventilation rates.
Air Filtration
The UA-90H includes particulate filtration to improve the indoor
air quality of your living/working space. MERV-11 media filter is
standard.
P.O. Box 8680 Madison, WI 53708 • TOLL-FREE 1-800-533-7533 • www.thermastor.com • sales@thermastor.com
© 2008 Therma-Stor LLC • Manual P/N TS-325b
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TABLE OF CONTENTS
Introduction .............................................................................3
Features & Benefits .................................................................3
Safety Precautions ...................................................................3
1. Intended Application ............................................................3
2. Registrations .......................................................................3
3. Specifications ......................................................................3
4 . Installation ..........................................................................3
4.1 Installation Checklist .....................................................3
4.1A Power Accessibility ................................................3
4.1B Space ....................................................................4
4.1C Low Voltage Wiring ................................................4
4.1D Back-Draft Damper ...............................................4
4.1E Support Structure and Suspension .........................4
4.2 Electrical Requirements ................................................4
4.3 Condensate Removal ....................................................4
4.3A Lifting Condensate ................................................4
4.3B Condensate Pump Kit ............................................4
4.4 Ducting ........................................................................5
4.4A Fresh Air/Supply Air ................................................5
4.4B Ducting for Fresh Air - Option ................................5
4.4C Installation in a Basement or Crawlspace ..............6
4.4D Installation in an Attic ............................................6
4.4E Installation in a Structure with
No Forced Air HVAC System ............................................6
4.4F Ducting for High Efficiency Filtration .......................7
4.5 Compressor Release and Noise Abatement ....................7
4.6 Controls ........................................................................7
4.6A Humidity/Fan Control Panel
WITHOUT Fresh Air Ventilation or Damper ......................7
4.6B Humidity/Fan Control Panel WITH
Fresh Air Ventilation and WITHOUT Damper ....................7
4.6C Humidity/Fan Control Panel WITH
Fresh Air Ventilation AND Damper ..................................7
4.6D Ventilation Timer and Humidity Control
WITH Fresh Air AND Motorized Damper ..........................8
4.6E DEH 3000 Digital Controller WITH
Fresh Air AND Damper ...................................................8
4.6F DEH 3000 Digital Controller
WITHOUT Fresh Air ........................................................8
4.7 Humidity Control Adjustment ........................................8
4.8 Fan/Filter Switch ...........................................................8
4.9 Ventilation Timer ...........................................................8
4.9A Setting the Time ....................................................8
4.9B Ventilation Schedule ..............................................8
4.9C Automatic or Manual Mode ....................................9
5. DEH 3000/DEH 3000R Digital Control ................................10
6. Control Package Diagram Sheet..........................................11
7. Maintenance ......................................................................12
7.1 Standard Air Filter .......................................................12
7.2 High Efficiency Air Filter ..............................................12
7.3 Optional Fresh Air Intake .............................................12
8. Wiring Diagrams ................................................................ 13
9. Optional Parts List ..............................................................14
10. Service Parts List .............................................................15
11. Service ............................................................................16
11.1 Technical Description ................................................16
11.2 Troubleshooting ........................................................16
11.3 Refrigerant Charging ................................................17
11.4 Compressor/Capacitor Replacement .........................17
11.5 Electric Ventilation Damper .......................................17
11.6 Condensate Pump Kit ...............................................18
Warranty ................................................................................20
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Ultra-Aire 90H Installer’s & Owner’s Manual
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SAFETY PRECAUTIONS
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 90H indoor air quality system.
READ AND SAVE THESE INSTRUCTIONS
• The device is designed to be installed INDOORS IN A SPACE THAT
IS PROTECTED FROM RAIN AND FLOODING.
• Install the unit with space to access the front panel for
maintenance and service. DO NOT INSTALL UNIT WITH THE
FRONT PANEL INACCESSIBLE.
• Avoid directing the discharge air at people, or over the water in
pool areas.
• If used near a pool or spa; be certain there is NO chance the unit
could fall into the water, splashed and that it is plugged into a
GFCI GROUND FAULT CIRCUIT INTERRUPT OUTLET.
• DO NOT use the device as a bench or table.
• DO NOT place the device directly on structural members.
• A drain pan MUST be placed under the unit if installed above a
living area or above an area where water leakage could cause
damage.Read and Save These Instructions
WARNING! — This symbol means important
instructions. Failure to heed them can result in serious
injury or death.
CAUTION! — This symbol means important
instructions. Failure to heed them can result in injury or
material property damage.
3. Specifications
Part Number: 4025700
Blower: 240 CFM @ 0.0" WG
220 CFM @ 0.4" WG
Supply Voltage: 110 -120 Volt – 60 Hz.
Amps: 6.3
Energy Factor: 2.37
Operating Temp.: 56°F Min, 100°F Max
Sized For: 2200 Square Foot Typical
Minimum Performance at Set Conditions:
Intake Air: 80°F, 60% RH
Capacity: 90 Pints/Day @ 80°F/60% RH
Pints/kWh: 5.0
UA-90H Duct Connections:
6" Round Inlet; 10" Round Inlet; 10" Round Outlet
Filter Efficiency: Standard MERV-11
(65% ASHRAE Dust Spot)
Optional MERV-14,
(95% ASHRAE Dust Spot)
Power Cord: 7.5', 115V With Ground
Drain Connection: 3/4" Threaded MPT
UA-90H Dimensions:
Unit Shipping
Width: 15 3/4" 20 1/2"
Height: 20 7/8" 25 7/8"
Length: 34 1/2" without collars 42"
40 1/2" with collars
Weight: 92 lbs 99 lbs
4. Installation
4.1 Installation Checklist
1. Intended Application for Ultra-Aire 90H
For the ideal installation, draw air from the central part of the home
and return it to isolated areas of the home like the bedrooms, den,
utility room, or family room. The ductwork of the existing heating
system can be used to supply air to the home.
2. Registrations
The UA-90H conforms to UL STD 474 and CSA Standard C22.2 No.92.
CAUTION!
Prior to installation of the UA-90H, the following checklist should
be reviewed. The UA-90H can be installed in a variety of locations
to meet the owner’s needs, and integrate with existing forced
air systems or existing ductwork if desired. The location choice
is contingent on a variety of requirements not limited to: ease
of service, controls access, drainage, filtration, power, fresh-air
ventilation, water damage prevention, and current regulatory codes
(ASHRAE, fire, etc). Please address all of these issues before you
select the device’s location.
n 4.1A Power Accessibility
Unit should be located in an area where the cord’s length (10’)
should easily reach a 115 VAC electrical outlet with a minimum of
a 15 A circuit capacity.
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n 4.1B Space
Location should have enough clearance to handle the unit’s overall
dimensions as well as the necessary return/supply ductwork to the
unit.
n 4.1C Low Voltage Wiring
Unit location should be in an area where field wiring the remote
controls (low voltage) to the unit will be possible.
n 4.1D Back-Draft Damper
It is recommended that a back draft damper be used in the
discharge duct of the UA-90H, especially when connecting to the
supply ducting system. The backdraft damper prevents supply air
from counter flowing through the UA-90H when it is not operating.
The unit location should be chosen to allow installation of this
accessory if requested by the end user.
n 4.1E Support Structure and Suspension
Place the UA-90H on supports to raise the base of the unit. Do not
place the UA-90H directly on structural building members without
vibration absorbers or unwanted noise may result.
The UA-90H may be suspended with steel hanger straps (plumbers
tape) or a suitable alternative from structural members, as long
as the suspending assembly supports the UA-90H’s base in its
entirety. Do not hang the UA-90H from the cabinet. Remember to
place a drain pan under the unit if it is suspended above a finished
area or above an area where water leakage could cause damage.
CAUTION!
Do not install the control panel 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 installer must supply the wiring between the UA90H and the control panel. Be sure to safely route the
control wiring to prevent damage during installation.
CAUTION!
Do not cross wires when connecting the UA-90H and the remote
control panel or damage to the transformer may result. The remote
controls of the UA-90H are powered by a low voltage circuit
(24VAC) and must NEVER contact or be connected to a high voltage
circuit.
The control wires leaving the UA-90H and the remote control
panels are numbered and color-coded to prevent confusion. Some
of the control wires leaving the UA-90H may not be used with
certain control panels and should be left unconnected with wire
nuts taped onto the stripped ends for safety. Be sure to consult the
electrical schematic in this manual or inside the access panel of
the UA-90H before making control connections.
4.3 Condensate (Water) Removal
4.2 Electrical Requirements
WARNING!
Do not allow the yellow lead from the ultra-aire to
contact the red lead from the ultra-aire or damage to
the transformer will result.
The UA-90H plugs into a common grounded 115VAC outlet. The
device draws 6.3 Amps under normal operating conditions. If used
in an area which may become wet, a ground fault interrupter (GFI)
protected circuit is recommended. Please, consult local electrical
codes for any further information.
Therma-Stor LLC offers a family of control devices for use with the
UA-90H. The controls are to be located remotely from the unit and
located in the space to be conditioned. The controls are low voltage
(24 volt) and should be connected to the UA-90H with low voltage
wire (thermostat or other appropriate).
CAUTION!
A trap in the drain line is preferred, but not required for the unit to
drain properly. Local codes may require a trap. Use care to keep the
pipe assembly as flat to the floor as possible. Kinks and/or humps
will prevent proper drainage. The UA-90H generates condensate.
Install a 3/4" male nominal pipe thread adapter to the drain pan.
It is necessary to assemble your own drain pipe assembly utilizing
3/4" PVC pipe to get the condensate to a floor or other drain. Pipe is
commonly available in 10’ lengths from building supply, plumbing
or hardware stores. Grade of pitch should be 1" per 10'.
4.3A Lifting Condensate
An optional condensate pump kit may be installed if a lift is
required to dispose of the condensate. The condensate pump can
be ordered direct from the factory. See the optional parts list in
Section 8 for information on the kit.
4.3B Condensate Pump Kit
An optional condensate pump kit is available from the factory for
use with the UA-90H. 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
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pump cover. This switch should be installed in series with the field
wire that connects the blue (#5) lead from the UA-90H to the the
control panel. If the pump fails, this switch opens the compressor
control circuit and stops water production before the reservoir
overflows. The UA-90H will continue to ventilate or circulate air as
normal, but will not dehumidify until this switch closes.
4.4 Ducting
CAUTION!
Attention: For ventilation only! Remove label and 6’’
round insulation from the duct prior to installing ducting
for outside ventilation. For all other applications leave in
place.
For the ideal installation, draw air from the central part of the home
and return it to the isolated areas of the home like the bedrooms,
den, utility room, or family room. The ductwork of the existing
heating system can be used to supply air to the home. If the
existing supply goes to isolated areas of the home, discharge the
supply of the UA-90H into the supply of the existing heating system.
Installation of a separate supply duct to the UA-90H from a central
area is recommended.
4.4A Fresh Air/Supply Air
CAUTION!
DO NOT draw air directly from the kitchen, laundry, or isolated
basement.
Connecting to existing HVAC systems: An optional 10" check
backdraft damper is available from the factory to prevent reverse
air flow through the UA-90H. If the UA-90H is ducted to the supply
of an air handler, the check damper should be placed in the UA90H supply duct. Ventilation operation is controlled by the remote
controls offered with the UA-90H. These controls determine the
time/frequency that the unit introduces outside air. The amount of
outside air can be restricted by the blade damper in the 6" collar.
Some control options require a 6" motorized damper be installed in
the 6" fresh air duct.
CAUTION!
Contact the factory when connecting to a static pressure of
greater than or equal to +.5" WG.
4.4B Ducting for Fresh Air — Option
Fresh air may be brought into the structure by connecting an
insulated duct from outside the structure to the 6" inlet of the UA90H. Advantages of this form of ventilation include:
You may draw air from a basement that is open to the home. All
flexible ducting connected to the UA-90H should be UL listed.
A short piece of flexible ducting on all UA-90H duct connections
is recommended to reduce noise and vibration transmitted to
rigid ductwork in the structure. Ducting the UA-90H as mentioned
requires consideration of the following points:
Duct Sizing: For total duct lengths up to 25’, use a minimum 10"
diameter round or equivalent rectangular. For longer lengths, use a
minimum 12" diameter or equivalent. Grills or diffusers on the duct
ends must not excessively restrict airflow. Isolated Areas: Effective
dehumidification may require that ducting be branched to isolated,
stagnant air flow areas. Use 8" or larger diameter branch ducting
to each of two or three areas, use 6" or larger to each of four or
more areas. Provisions must be made to provide airflow from
supply locations to central return location. Proper air distribution
is important to ensure even humidity control and heat distribution
throughout the structure. See Figure 1.
1. Outside air is filtered before entering the building.
2. Outside air will be dehumidified before entering if the UA-90H
is running in dehumidification mode.
3. Drawing air from outside and blowing inside aids in slightly
pressurizing the structure. This helps prevent dirty and humid
air from entering elsewhere. It also reduces the potential for
carcinogenic radon gas to enter and provides a small amount
of make-up air for open combustion and exhaust devices like
the clothes drier, fireplace, and water heater.
4. Exhaust fans are recommended in the bath rooms and
kitchen.
In cold climates or areas where the outdoor dew point is low at
times, ventilation can be used to dehumidify the structure, making
the UA-90H capable of year-round drying. This is accomplished
by bringing the dry, low dew point air into the structure during
these times. This approach is often more economical than running
the dehumidifier to remove excess moisture from the structure.
In cold climates, it is critical to adequately ventilate to reduce the
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FOR HVAC INSTALLER ONLY
inside moisture content to avoid moisture accumulating in the wall
cavities. For example; in a house that experiences condensation on
the interior surface of the windows during the winter, increasing the
amount of ventilation will often cure the problem.
An insulated 6" diameter duct is generally sufficient to provide up
to 75 CFM of outside air. Large quantities of outside air will impact
UA-90H performance positively or negatively, depending upon the
inside and outside air conditions.
The outside air duct should be connected to the 6" round collar on
the front of the unit. The amount of outside air can be restricted
by the blade damper in the 6" collar. These controls determine
the time/frequency that the unit introduces outside air. The
amount/frequency of ventilation should be based on the size and
occupancy of the residence. If you are unsure of your ventilation air
requirements or have need for higher air flows, consult the factory
by calling 1-800-533-7533 for assistance.
4.4C Installation in a Basement or Crawlspace with an
Existing Forced Air HVAC System.
Instead of installing a separate return to the UA-90H, and if the
existing system has multiple returns, it is possible to select one to
disconnect from the existing forced air system and use it for the
dedicated Ultra-Aire return. Always select a return from a central
location in the structure in an area that is always open to the rest
of the structure. Do not use a return from a room that may have
its door closed much of the time or, alternatively, install a separate
return from the open part of the house.
4.4D Installation in an Attic with an Existing Forced Air
HVAC System
CAUTION!
ALWAYS install a catch pan with a drain or float interrupt
for condensate under the UA-90H in an attic or condensate
may damage the living space below.
The interrupt switch should be installed in series with the field wire
that connects the blue (#5) lead from the UA-90H to the blue (#5)
lead on the control panel. If overflow occurs, this switch opens
the compressor control circuit and stops water production before
the catch pan overflows. The UA-90H will continue to ventilate or
circulate air as normal, but will not dehumidify until this switch
closes.
Basement Installation: Install a separate 10" return for the UA90H in a central area of the structure. Optional: Duct the supply
of the Ultra-Aire to a 10" x 10" x 10" tee/damper, adjusted to
20% open to the basement. Duct the other side of the tee to the
air supply of the existing HVAC system with a backdraft damper.
Connect a duct from outside to the 6" collar of the Ultra-Aire if you
wish to provide ventilation air. See Figure 2.
Crawlspace Installation: Install a separate return for the UA-90H
in a central area of the structure. Optional: Duct the supply of the
UA-90H to a 10" x 10" x 10" tee/damper that is 20% open to
the crawlspace if desired. Duct the other side of the tee to the
air supply of the existing HVAC system with a backdraft damper.
Connect an insulated duct from outside to the 6" collar of the UA90H if you wish to provide optional ventilation air.
The preferred method of installation is to create a separate return
for the UA-90H in a central area of the structure. Duct the supply of
the UA-90H to the air supply of the existing HVAC system. Connect
an insulated duct from outside to the 6" collar of the UA-90H if you
wish to provide fresh make-up air. Adjust a damper in the duct to
provide the desired.
4.4E Installation in a Structure with No Existing Forced
Air HVAC System
When installing the UA-90H in a structure that does not have a
forced air HVAC system, a single return for the UA-90H should
be installed in central open area of the structure. DO NOT locate
the return in a bathroom or a kitchen. The supplies of the UA90H should be located in the remote areas of the structure (such
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Ultra-Aire 90H Installer’s & Owner’s Manual
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FOR HVAC INSTALLER ONLY
as bedrooms, den, etc.). By ducting this way, the air inside the
structure will circulate through the UA-90H to be filtered and
dehumidified. 6" diameter duct is recommended for branches to
the bedrooms, 8" diameter duct is recommended for branches
to larger areas. Connect an insulated duct from outside to the 6"
collar of the UA-90H if you wish to provide ventilation. See Figure 4.
4.4F Ducting for High Efficiency Filtration
The standard filter included with the UA-90H is a very effective
MERV 11 media filter. Additional filtering options, including charcoal
filtration and 95% efficient filtration, are available with an optional
external filter housing that may be installed with the UA-90H. The
filter box is ducted to the intake of the UA-90H, and the intake
ducting is then connected to the intake side of the filter box. See
the optional accessories list or call the factory for details.
Humidity/Fan Control Panel (P/N 4024155) (Figure 1, p.7)
4.6A Humidity/Fan Control Panel WITHOUT Fresh Air
Ventilation or Damper
4.6B Humidity/Fan Control Panel WITH Fresh Air
Ventilation and WITHOUT Damper
4.6C Humidity/Fan Control Panel WITH Fresh Air
Ventilation AND Damper
Ventilation Timer/Humidity Control Panel (P/N 4024125)
(Figure 2, p.7)
4.6D Ventilation Timer and Humidity Control WITH Fresh Air
AND Motorized Damper
DEH 3000 Digital Control (P/N 4028539)
4.6E Digital Controller WITH Fresh Air AND Damper
4.6F Digital Controller WITHOUT Fresh Air
4.6A Humidity/Fan Control Panel WITHOUT Fresh Air
Ventilation or Damper
The humidity/fan control panel automatically controls the humidity
of the living space. The humidity/fan control panel contains an
adjustable humidity control and a fan switch. The panel has a
cover that must remain open to the air within the living space for
accurate humidity sensing. When the fan switch is in the “ON”
position, air will be continually filtered and circulated throughout
the home. For humidity control operation refer to section 4.7.
4.5 Noise Abatement
A length of 10 feet or more of acoustical flex ducting on the outlet
of the UA-90H will reduce air noise from the fan. A length of flexible
ducting on all UA-90H duct connections is recommended to reduce
noise transmitted to rigid ductwork in the structure.
4.6 Controls
All control panels should be mounted in a central area of the
structure where it can accurately sense the humidity of the air in
the living space and be accessed. All controls require field wiring
from the unit location to the panel mount location.
Figure 1:
Humidity/Fan Control Panel
Part No. 4024155
To determine how each control operates the UA-90H, it must
first be determined which control is being used and whether
or not the 90H is ducted for fresh air ventilation. Refer to
appropriate section.
Figure 2: Ventilation Timer
and Humidity Control Panel
Part No. 4024125
4.6B Humidity/Fan Control Panel WITH Fresh Air
Ventilation and WITHOUT Damper
The humidity/fan control panel automatically controls the humidity
of the living space. The humidity/fan control panel contains an
adjustable humidity control and a fan switch. The panel has a
cover that must remain open to the air within the living space for
accurate humidity sensing. Outside air is continually introduced
whenever fan is “ON.” Manual operation of fan filter switch controls
outside air ventilation. Since the fan operates whenever the UA-90H
is dehumidifying outside air will also be introduced. For humidity
control operation refer to section 4.7.
4.6C Humidity/Fan Control Panel WITH Fresh Air
Ventilation AND Damper
In this configuration, a motorized damper has been installed
in the fresh air duct. When the fan/filter switch is in the “OFF”
position, the damper is closed. The UA-90H will then circulate and
dehumidify air to provide humidity control.
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When the fan/filter switch is in the “ON” position, the motorized
damper will open and the fan will run, introducing outside air. The
unit may or may not be dehumidifying in the ventilation mode,
depending on the humidity control setting. See Section 4.7 for
humidity control operation.
4.6D Ventilation Timer and Humidity Control WITH
Fresh Air AND Motorized Damper
Refer to sections 4.7 through 4.9C.
4.6E DEH 3000 Digital Control WITH Fresh Air AND
Damper
Refer to Section 5.
4.6F DEH 3000 Digital Control WITHOUT Fresh Air
Refer to Section 5.
4.7 Humidity Control Adjustment
Set the humidity control to the desired
humidity level for the home. Turning the
knob clockwise results in a drier setting. See
the back of the control panel cover for set
points. The dehumidifier will run continuously
Figure 3
Humidity Control
Adjustment Knob
unit will simply run longer to reduce the RH to the setting. The
UA-90H unit (and refrigerant-based dehumidifiers in general) will
reduce a warm space’s RH to a lower level than that of a cool
space. Therefore there is no benefit to set the humidity control to
excessively low levels in cool rooms; doing so will result in long
periods of ineffective dehumidifier run time. Settings below 45%
are not recommended.
until the relative humidity (RH) is reduced
to the humidity control dial setting. Setting
the humidity control to lower RH levels will
NOT increase the dehumidification rate; the
4.8 Fan/Filter Switch
Turning ON the fan/filter switch will cause
the UA-90H fan to run continuously, whether
the UA-90H is dehumidifying or not. This
function is desirable if the unit is used for air
circulation and filtration to achieve maximum
Figure 4
Fan/Filter Switch
the switch is OFF the fan will operate only when the humidity
control calls for dehumidification or when the ventilation timer calls
for ventilation.
indoor air quality. When the switch is ON; air
will be constantly filtered through the UA-90H
and circulated throughout the house. When
4.9 Ventilation Timer
The ventilation timer controls the fan and the motorized fresh
air damper. When the ventilation timer is activated, the UA-90H
will circulate the indoor air, and bring in fresh air from outside.
The ventilation timer should be set for the required ventilation
of the residence. The home should be ventilated with fresh air
as suggested by applicable codes and standards or as required
by the homeowner. The ventilation timer is an electronic timer
that displays the current time. This timer has battery backup,
so it will not require resetting after a power outage. Following
a prolonged power outage the display of the timer will flash on
and off indicating a power outage has occurred. The one-minute
time increments of the ventilation timer allow you to program the
ventilation of your home to fit your schedule.
Humidity/Fan Control Panel
Part No. 4024155
The ventilation timer allows six programs with each program
having one “ON” and one “OFF” event. A program allows the
user to turn the ventilation on at a certain day and time, then it
allows them to turn the ventilation off at a certain day and time.
Each of these programs can be repeated daily or weekly or
during a specified block of days. All six of the programs operate
independently of each other. If the timer fails to operate or operates
erratically, check that the control panel receives 24Vac from the
UA-90H. If 24Vac is present at the control panel, reset the timer by
pressing the reset button at the bottom center of the timer face.
The reset button is the small recessed button with an R beneath
it located below the 1-7 and h buttons. Depress the reset button
until the display clears. Release the reset button. The display will
reappear as 00:00. Resetting the timer will clear the time and all
program settings. After resetting the timer follow the instructions
below to set the correct time and ventilation programs.
Ventilation Timer & Humidity
Control Panel
Part No. 4024125
4.9A Setting the Time
Set the correct time on the timer by sliding the switch in the upper
right hand corner of the timer to the clock symbol. and pressing the
1-7 (DAY), h (HOUR), and m (MINUTE) buttons. Remember this timer
operates on a 24-hour (military time) clock.
4.9B Ventilation Schedule
Slide the switch in the upper right hand corner to the program
symbol P. “ON” will appear to the right of the time and the number
“1” will appear in the lower right hand corner of the display. The
“1” and “ON” signify the turn on time for the first program. Press
the 1-7, h and m button to choose the days of the week for this
program. You can choose Mon.-Sun., Mon.-Fri., Sat.-Sun., or any
single day of the week. The days chosen are shown along the top
of the display on the ventilation timer. Next press the h button to
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set the hour for the start of the ventilation period. Remember this
timer operates on a 24-hour clock (military time). Then press the m
button to set the minutes past the hour to start the ventilation.
Now, with the ventilation start time set; press the I/O button. The
word “OFF” should appear to the right of the time and the number
“1” should remain in the lower right hand corner of the display. The
“1” and “OFF” signify the turn off time for the first program. Set
the turn off time using the 1-7, h and m buttons in the same way
as described above and continue on to the second through sixth
programs. When setting the ventilation programs, you can return
to the current time display by sliding the switch in the upper right
corner of the timer to RUN. The slide switch must be set to RUN for
the timer to operate its scheduled programs.
4.9C Automatic or Manual Mode
The slide switch in the upper left of the timer is used to choose
between automatic and manual operation. When the slide switch
is set to AUTO mode, the UA-90H will ventilate when the scheduled
programs call for ventilation. When the slide switch is set to manual
(set to hand symbol on the right), the operation of the timer is
controlled by the I/O button only. Pressing the I/O button will switch
the ventilation timer between ON (detent) and OFF (detent). As you
press the I/O button, “ON” or “OFF” will be displayed to the right of
the time. The “ON” or “OFF” indicates if the ventilation timer is on
or off. The I/O button will manually override scheduled programs if
the timer is in AUTO mode.
9
Ultra-Aire 90H Installer’s & Owner’s Manual
Page 10
DEH 3000, DEH 3000R DEHUMIDIFIER & VENTILATION SYSTEM CONTROLLER
DEH 3000/DEH 3000R
DEH 3000/DEH 3000
R
Part No. 4028539 Part No. 4028407
5. Optional Dehumidifier & Ventilation
System Controller
When used with Ultra-Aire Whole House Ventilating
Dehumidifiers, the DEH 3000/3000R allows homeowners the
ability to monitor and control relative humidity levels in their
home.
DEH3000 P/N: 4028539
DEH3000R (remote) P/N: 4028407
Model: DEH 3000
DEH 3000R (remote)
Operating Voltage: 24 VAC
Max Current
DMP, COMP, FAN: 1 AMP each
Humidity Range/Accuracy: 10 – 95% RH, ± 5%
Auxillary Relay Capacity: 5 Amps, 24VAC
Temp Range/Accuracy: 30°-90°F, 2%
Size: 4.95"L x 1.06"W x 4.19"H
Major Operations
n
Digital control of Relative Humidity (Digital Set-Point)
n
Fan/Filter Operation
n
Programmable Ventilation Timer
n
Large, easy-to-read backlit LCD display
n
Easy interaction with air handler fan (Interlock/Lockout)
n
High Temperature Cut-Out
n
Dryout Cycle Timer
n
Auto Reboot
n
Remote Sensor (DEH 3000R Only)
To order call Therma-Stor at
1-800-533-7533
10
Ultra-Aire 90H Installer’s & Owner’s Manual
Page 11
ATTENTION INSTALLER
6. Control Package Diagrams. Wire the unit and control package as shown in the diagram below.
Humidity/Fan Control Panel
Ventilation Timer/
Humidity Control Panel
DEH 3000 Digital Control
(P/N 4028539; with remote: P/N 4028407)
WARNING: DO NOT allow the yellow lead from the unit to contact the red lead or the white lead from the
unit or damage to the transformers will result. Do not direct connect the white lead on the unit to the violet
lead on the ventilation control or damage to the transformer will result.
11
Ultra-Aire 90H Installer’s & Owner’s Manual
Page 12
FOR HVAC INSTALLER AND HOMEOWNER
7. Maintenance
7.1 Standard Air Filter
The UA-90H is equipped with a MERV 11 media filter. This filter
should be checked every three months. Operating the unit with
a dirty filter will reduce dehumidifier capacity and efficiency and
may cause the compressor to cycle off and on unnecessarily on the
defrost control.
DO NOT operate the unit without the standard filter or with a
less effective filter than the standard filter. The heat exchange
coils inside the unit could become clogged and require
disassembly to clean. Filter non-compliance invalidates the
product warranty.
7.2 High Efficiency Air Filter
Most filters are labeled with a MERV rating number, which
measures a filter’s ability to trap particles ranging in size from 3.0
microns to 10.0 microns. Residential filters commonly have MERV
ratings of 1-12. The higher the MERV rating, the more efficient the
filter is, and the more particles it can filter.
The UA-90H comes with a standard MERV 11 filter. A MERV
rating of 11 means the filter is 85% to 95% minimum efficient
at capturing the measured particles. For greatest filtration and
efficiency of the UA-90H, it is recommended the air filter be
replaced every three months with a MERV 11 rated filter.
7.3 Optional Fresh Air Intake
Check and clean the screen on the outdoor fresh air intake port
seasonally. The screen may become plugged during the seasons
when there are many particles in the outdoor air.
12
Ultra-Aire 90H Installer’s & Owner’s Manual
Page 13
ULTRA-AIRE 90H WIRING DIAGRAM
8. Wiring Diagrams
UA-90H with Humidity/Fan Control
(4024155)
UA-90H with Ventilation Timer/Humidity/
Fan Control (4024125)
13
Ultra-Aire 90H Installer’s & Owner’s Manual
Page 14
FOR HVAC INSTALLER ONLY
9. Optional Parts List: UA-90H Indoor Air Quality System
Item Part No. Description
1 4024125 Control Panel Assembly, Ventilation Timer & Humidity Control
2 4024155 Control Panel Assembly, Humidity/Fan
3 4028539 DEH 3000 Digital Controller
3a. 4028407 DEH 3000R Digital Controller
4 4025287 Filter Box
5 4026161 14"x14"x1" Standard UA 90-H Filter
6 4024369 2"x20"x24" Filter (not shown) Use only with Filter Box
7 4024370 4"x20"x24" Filter (not shown) Use only with Filter Box
8 4026451 Condensate Pump Kit/UA-90H (not shown)
9 4026450 Leveling Foot Kit/UA-90H (not shown)
10 4020646 10" Backdraft Damper (not shown)
11 4023660 Controller, Humidity
12 4023672 Duct Damper, 6" Diameter, Electrically Actuated (not shown)
13 4024153 Cover for Items 1 & 2 (not shown)
14 4021495 Knob, Black, .25" shaft
15 4024150 Instructions, Humidity/Fan (not shown)
16 4024122 Instructions, Ventilation Timer & Humidity (not shown)
17 4020554 Switch, Black, SPDT, On/Off
18 4022486 Timer, 7-Day, 24 Vac, Programmable
(P/N 4028539; with remote: P/N 4028407)
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Ultra-Aire 90H Installer’s & Owner’s Manual
Page 15
FOR HVAC INSTALLER ONLY
10. Service Parts List: UA-90H Indoor Air Quality System
Item Part No. Description
1 4026703 Compressor
2 4026744 Compressor Overload
3 4022484 Compressor Relay, SPST, 24 Vac, 30A
4 4024912 Compressor Run Capacitor, 25 MFD
5 4025561 Fan
6 4020924 Fan Relay, SPDT, 24 Vac, 15A
7 4022487 Transformer, 120/24 Vac, 40 VA
8 4025544 Condenser, Evaporator, Strainer & Capillary Tube Assembly
FOR HOMEOWNER - ROUTINE MAINTENANCE
Item Part No. Description
1 4026161 14"x14"x1" Standard UA 90-H Filter
2 4024369 2"x20"x24" Filter (not shown) Use only with Filter Box
3 4024370 20"x24" Filter (not shown) Use only with Filter Box
It is recommended the filter be checked every six months. Operating the unit with a dirty filter will reduce
dehumidifier capacity and efficiency and may cause the compressor to cycle off and on unnecessarily on the defrost
control.
15
Ultra-Aire 90H Installer’s & Owner’s Manual
Page 16
FOR HVAC INSTALLER ONLY
11. Service
CAUTION!
CAUTION: Servicing the UA-90H with its high pressure
refrigerant system and high voltage circuitry presents a
health hazard which could result in death, serious bodily
injury, and/or property damage. Call your HVAC contractor.
11.1 Technical Description
The UA-90H uses a refrigeration system similar to an air
conditioner’s to remove heat and moisture from incoming air, and
add heat to the air that is discharged. Hot, high-pressure refrigerant
gas is routed from the compressor to the condenser coil (See Figure
1). The refrigerant is cooled and condensed by giving up its heat to
the air that is about to be discharged from the unit. The refrigerant
liquid then passes through a strainer and capillary tubing which
causes the refrigerant pressure and temperature to drop. It next
enters the evaporator coil where it absorbs heat from the incoming
air and evaporates. The evaporator operates in a flooded condition,
which means that all the evaporator tubes contain liquid refrigerant
during normal operation. A flooded evaporator should maintain
nearly constant pressure and temperature across the entire coil,
from inlet to outlet.
11.2 Troubleshooting
No dehumidification, neither fan nor compressor run with fan
switch and ventilation timer OFF.
1. Unit unplugged or no power to outlet.
2. Humidity control set too high or defective.
3. Loose connection in internal or control wiring.
4. Defective Compressor relay.
5. Defective control transformer.
6. Optional Condensate Pump Safety Switch open.
No dehumidification, compressor does not run but fan runs
with fan switch and ventilation timer OFF and humidity control
turned to ON.
1. Defective compressor run capacitor.
2. Bad connection in compressor circuit.
3. Defective compressor overload.
4. Defective compressor.
5. Defrost thermostat open.
6. Optional Condensate Pump Safety Switch open.
Fan runs with fan switch and ventilation timer OFF, but
compressor cycles on and off.
1. Low ambient temperature and/or humidity causing unit to
cycle through defrost mode.
2. Defective compressor overload.
3. Defective compressor.
4. Defrost thermostat defective.
5. Dirty air filter(s) or airflow restricted.
6. Low refrigerant charge, causing defrost control to cycle.
7. Bad connection in compressor circuit. Fan does not run with
fan switch in either position.
Refrigeration System of UA-90H
The mixture of gas and liquid refrigerant enter the accumulator
after leaving the evaporator coil. The accumulator prevents any
liquid refrigerant from reaching the compressor. The compressor
evacuates the cool refrigerant gas from the accumulator and
compresses it to a high pressure and temperature
Fan does not run with ventilation timer activated. Compressor
runs briefly but cycles on & off with humidity control turned to
ON.
1. Loose connection in fan circuit.
2. Obstruction prevents fan rotation.
3. Defective fan.
4. Defective fan relay.
5. Defective fan capacitor.
Fan runs with fan switch ON. Fan does not run with ventilation
timer activated.
1. Defective ventilation timer.
2. Time not correct on ventilation timer.
3. Ventilation timer set to manual and switched OFF.
4. Defective fan switch.
Evaporator coil frosted continuously, low dehumidifying
capacity.
1. Defrost thermostat loose or defective.
2. Low refrigerant charge.
3. Dirty air filter(s) or airflow restricted.
4. Excessively restrictive ducting connected to unit.
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Ultra-Aire 90H Installer’s & Owner’s Manual
Page 17
FOR HVAC INSTALLER ONLY
Unit not providing ventilation. Ventilation timer not operating
correctly.
1. If timer is not functioning correctly reset timer and reprogram.
2. Check control wire connections (check connections at fresh
air damper also).
3. Defective fresh air damper.
4.Defective fan switch.
Unit removes some water, but not as much as expected.
1. Air temperature and/or humidity have dropped.
2. Humidity meter and or thermometer used are
out of calibration.
3. Unit has entered defrost cycle.
4. Air filter dirty.
5. Defective defrost thermostat.
6. Low refrigerant charge.
7. Air leak such as loose cover or ducting leaks.
8. Defective compressor.
9. Restrictive ducting.
10.Optional Condensate Pump Safety Switch open.
Unit Test to determine problem:
1. Detach field control wiring connections from main unit.
2. Connect the yellow and green pigtails from the main unit
together; only the fan should run. Disconnect the wires.
3. Connect the yellow and blue pigtails from the main unit
together; the compressor and fan should run.
4. If these tests work, the main unit is working properly. You
should check the control panel and field control wiring for
problems next.
5. Remove the control panel from the mounting box and detach
it from the field installed control wiring. Connect the blue,
yellow, and green wires from the control panel directly to the
corresponding colored pigtails on the main unit. Leave the
violet, white and red wires disconnected!
6. Turn on the fan switch; the fan should run. Turn off the fan
switch.
7. Turn on the humidity control; the compressor and fan should
run.
8. If these tests work, the problem is most likely in the field
control wiring.
11.3 Refrigerant Charging
If the refrigerant charge is lost due to service or a leak, a new
charge must be accurately weighed in. If any of the old charge is
left in the system, it must be recovered before weighing in the new
charge. Refer to the unit nameplate for the correct charge weight
and refrigerant type.
11.4 Compressor/Capacitor Replacement
This compressor is equipped with a two terminal external overload
and a run capacitor, but no start capacitor or relay.
CAUTION!
CAUTION-ELECTRICAL SHOCK HAZARD: Electrical power must
be present to perform some tests. These tests should be
performed by a qualified service person.
11.5 Electric Ventilation Damper
The electric ventilation damper is controlled by the ventilation timer.
The damper will open when the ventilation timer is activated to
allow fresh air into the structure through the 6" diameter fresh air
inlet duct. The electric ventilation damper will remain closed when
the ventilation timer is not activated to prevent over-ventilating
the structure when the unit is dehumidifying or recirculating the
indoor air. The electric ventilation timer operates on 24 Vac from the
control circuit. DO NOT connect high voltage to the damper motor
or damage to the motor may result. DO NOT force the blade of the
damper by hand or damage to the damper motor may result.
The damper opens in one direction only. The damper rotates very
slowly, allow sufficient time for the damper to cycle. The damper
will take approximately one minute to cycle from closed to open or
from open to closed.
If the electric ventilation damper fails to operate:
1. Check that the wiring is correct and that voltage is present at
the damper motor.
2. Check for any obstruction inside the damper. If the electric
ventilation damper fails to operate after performing these
checks, it must be replaced.
11.6 Condensate Pump Kit
An optional condensate pump kit is available from the factory for
use with the UA-90H. 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 the blue (#5) lead from the UA-90H to the blue
(#5) lead on the control panel. If the pump fails, this switch opens
the compressor control circuit and stops water production before
the reservoir overflows. The UA-90H will continue to ventilate or
circulate air as normal, but will not dehumidify until this switch
closes. See following pages for more information.
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Ultra-Aire 90H Installer’s & Owner’s Manual
Page 18
CONDENSATE PUMP INSTALLATION: FOR HVAC INSTALLER ONLY
Available accessory: P/N 4026451
CONDENSATE PUMP KIT INSTALLATION. This condensate pump kit
must be installed with leveling feet. Do not use casters.
Step 1. Lay the unit on it's side. Make sure the filter door
is facing upward. Note the locations of the four leveling feet
and the hose adaptor.
Step 2. Partially screw in the leveling feet at the four locations.
Step 3. Hand tighten the hose adaptor to get the threads
started. Turn clockwise.
Step 4. Use adjustable pliers to finish tightening. Fully
seat the drain adaptor so that no leaks occur.
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Ultra-Aire 90H Installer’s & Owner’s Manual
Page 19
CONDENSATE PUMP INSTALLATION: FOR HVAC INSTALLER ONLY
Step 5. Turn the unit upright onto the leveling feet and remove
the screw shown. Keep this screw. You will use it in Step 7.
Step 6. Position the oblong slot in the bracket with the
middle screw hole. Secure the pump to the dehumidifier
with the screw removed in Step 5.
Step 8. Attach the 20' drain hose to the condensate pump
and route it to a floor drain.
Step 9. Adjust the height of the leveling feet to move the
level bubble into the clear area of the window.
Step 7. Remove the hose/elbow assembly from the bag
and install the long end into the condensate pump and the
short end onto the adaptor. Make sure that the hose fully
covers the adaptor barbs.
19
Step 10. Plug in the condensate pump and the assembly
is completed.
Ultra-Aire 90H Installer’s & Owner’s Manual
Page 20
Limited Warranty
Limited Warranty. Therma-Stor, LLC (“Therma-Stor”) warrants as
follows: (i) the Ultra-Aire 90H dehumidifier (“Product”) will be free of
material defects in workmanship or materials for a period of two (2)
years (“Two-Year Warranty”) following the date of initial purchase
of such Product by an original customer purchasing from ThermaStor or an authorized reseller (“Customer”); and (ii) the Product’s
condenser, evaporator, and compressor will be free of material
defects in workmanship or materials for a period of five (5) years
following the date of initial purchase of such Product by a Customer.
Limitation of Remedies. CUSTOMER’S SOLE AND EXCLUSIVE
REMEDY UNDER THE ABOVE LIMITED WARRANTY AND THERMASTOR’S ENTIRE LIABILITY THEREUNDER, SHALL BE, AT THE SOLE
OPTION OF THERMA-STOR, REPLACEMENT OR REPAIR OF SUCH
PRODUCT OR ITS COMPONENTS (“COMPONENTS”) BY THERMASTOR OR THERMA-STOR’S AGENTS ONLY. REFRIGERANT, PIPING,
SUPPLIES, TRANSPORTATION COSTS, LABOR COSTS INCURRED
IN REPAIR OR REPLACEMENT OF SUCH COMPONENTS ARE NOT
INCLUDED. THIS DISCLAIMER AND EXCLUSION SHALL APPLY
EVEN IF THE EXPRESS WARRANTY AND LIMITED REMEDY SET
FORTH HEREIN FAILS OF ITS ESSENTIAL PURPOSE. CUSTOMER
ACKNOWLEDGES THAT NO REPRESENTATIVE OF THERMA-STOR OR
OF ITS AFFILIATES OR RESELLERS IS AUTHORIZED TO MAKE ANY
REPRESENTATION OR WARRANTY ON BEHALF OF THERMA-STOR
OR ANY OF ITS AFFILIATES OR RESELLERS THAT IS NOT IN THIS
AGREEMENT. Notwithstanding the above, during the term of the
Two-Year Warranty only, Therma-Stor will provide, free of charge to
Customer, all Components and labor (except costs related to removal
and installation of Product) required to fulfill its obligations under such
Two-Year Warranty.
Disclaimer of Warranties. EXCEPT FOR ABOVE LIMITED
WARRANTY, WHICH IS THE SOLE AND EXCLUSIVE WARRANTY
PROVIDED WITH RESPECT TO THE PRODUCT AND ITS COMPONENTS,
THERMA-STOR HEREBY DISCLAIMS ALL EXPRESS AND IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE.
Warranty Limitations. The foregoing limited warranty extends only
to a Customer and shall be null and void upon attempted assignment
or transfer. A “defect” under the terms of the limited warranty shall
not include problems resulting from Customer’s or Customer’s
employees’, agents’, invitees’ or a third party’s misuse, improper
installation, improper design of any system in which the Product
is included, abuse, lack of normal care, failure to follow written
instructions, tampering, improper repair, or freezing, corrosion, acts
of nature or other causes not arising out of defects in Therma-Stor’s
workmanship or material. If a Product or Component is replaced
while under warranty, the applicable limited warranty period shall
not be extended beyond the original warranty time period. The
limited warranty does not cover any costs related to changes to a
Product or Component that may be required by any codes, laws, or
regulations that may become effective after initial purchase of the
Product by Customer.
Customer Responsibilities. As a further condition to obtaining
warranty coverage hereunder, the Customer must send a valid
warranty claim to Therma-Stor such that Therma-Stor receives
such claim prior to the end of the applicable warranty period.
Therma-Stor shall have no obligation hereunder with respect to
any claim received by Therma-Stor after the expiration of the
applicable warranty period. As a further condition to obtaining
warranty coverage hereunder, the Customer must present forms of
invoices evidencing proof of purchase of a Product. If such invoices
do not clearly indicate the date of initial purchase by a Customer,
the applicable Product’s date of manufacture will be used instead
of the date of initial purchase for the purpose of calculating the
commencement of the applicable warranty period. Warranty service
must be performed by Therma-Stor or a servicer authorized by
Therma-Stor. In order to obtain warranty service, the Customer
should call Therma-Stor at 1-800-533-7533 and ask for the
Therma-Stor Products Service Department, which will then arrange
for applicable warranty service. Warranty service will be performed
during customary, daytime working hours. If the Product must be
shipped for service, Customer shall be solely responsible for properly
packaging the Product, for all freight charges, and for all risk of loss
associated with shipment.
Limitation of Liability. IN NO EVENT SHALL THERMA-STOR,
IN CONNECTION WITH THE DESIGN, SALE, INSTALLATION, USE,
REPAIR, REPLACEMENT OR PERFORMANCE OF ANY PRODUCT,
COMPONENT, PART THEREOF OR WRITTEN MATERIAL PROVIDED
THEREWITH, BE LIABLE, TO THE EXTENT ALLOWED UNDER
APPLICABLE LAW, UNDER ANY LEGAL THEORY FOR ANY SPECIAL,
DIRECT, INDIRECT, COLLATERAL OR CONSEQUENTIAL DAMAGES
OF ANY KIND. NOTWITHSTANDING THE ABOVE LIMITATIONS AND
WARRANTIES, THE SOLE AND EXCLUSIVE LIABILITY OF THERMASTOR, REGARDLESS OF THE NATURE OR THEORY OF THE CLAIM,
SHALL UNDER NO CIRCUMSTANCES EXCEED THE PURCHASE PRICE
OF THE PRODUCT, COMPONENT OR PART UPON WHICH THE CLAIM
IS PREMISED.
Applicable Law and Venue. ANY ARBITRATION, ENFORCEMENT
OF AN ARBITRATION OR LITIGATION RELATED TO THE PRODUCT
WILL BE BROUGHT EXCLUSIVELY IN DANE COUNTY, WISCONSIN,
AND CUSTOMER CONSENTS TO THE JURISDICTION OF THE
FEDERAL AND STATE COURTS LOCATED THEREIN, SUBMITS TO
THE JURISDICTION THEREOF AND WAIVES THE RIGHT TO CHANGE
VENUE. CUSTOMER FURTHER CONSENTS TO THE EXERCISE OF
PERSONAL JURISDICTION BY ANY SUCH COURT WITH RESPECT TO
ANY SUCH PROCEEDING.
Miscellaneous. If any term or condition of this Limited Warranty
is found by a court of competent jurisdiction to be invalid, illegal or
otherwise unenforceable, the same shall not affect the other terms
or conditions hereof or thereof or the whole of this Limited Warranty.
Any delay or failure by Therma-Stor to exercise any right or remedy
will not constitute a waiver of Therma-Stor to thereafter enforce
such rights.
20
Ultra-Aire 90H Installer’s & Owner’s Manual
Page 21
PO Box 8680 • Madison, WI 53708
Phone: 608-222-5301 • Fax: 608-222-1447
Web: www.thermastor.com • Email: sales@thermastor.com
Information in this document is subject to change without notice. No part of
this document may be reproduced or transmitted in any form or by any means,
electronic or mechanical, for any purpose, without the express written permission
of Therma-Stor LLC. © 2008 Therma-Stor LLC. All rights reserved.
Ultra-Aire 90H Installer’s & Owner’s Manual
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