Therma Stor Products Group Dehumidifier 90H User Manual

INSTALLER’S & OWNER’S MANUAL  
HVAC INSTALLER: PLEASE LEAVE MANUAL FOR HOMEOWNER  
P/N 4025700 • Serial No.___________________________  
The Ultra-Aire 90H dehumidifier performs multiple functions in  
a compact enclosure; high-capacity dehumidification, fresh air  
ventilation, and particulate filtration.  
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.  
Dehumidification  
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.  
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.O. Box 8680 Madison, WI 53708 TOLL-FREE 1-800-533-7533 www.thermastor.com sales@thermastor.com  
© 2007 Therma-Stor LLC • Manual P/N TS-325, 8/07  
Download from Www.Somanuals.com. All Manuals Search And Download.  
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.  
3
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR HVAC INSTALLER ONLY  
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.  
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.  
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.  
2. Registrations  
The UA-90H conforms to UL STD 474 and CSA Standard C22.2  
No.92.  
3. Specifications  
Model:  
Ultra-Aire 90H  
n 4.1E Support Structure and Suspension  
Electrical:  
Capacity:  
Operating Temp.:  
Air Flow:  
110-120 VAC, 6.3 Amps, 60 Hz, grounded  
90 pints/day @ 80°F, 60% RH  
56°F min., 100°F max.  
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.  
200 CFM without external ducting  
Refrigerant Charge: 1 lb., 12 oz. R22  
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.  
Duct Connections:  
Round 10" inlet, 10" outlet,  
6" ventilation inlet Filter Size:  
Unit Size (w/o duct collars):  
Weight:  
Pleated cloth: 14" X 14" X 1"  
341/2"L x 153/4"W x 207/8"H Unit  
92 lbs Shipping Weight: 99 lbs  
4. Installation  
4.1 Installation Checklist  
4.2 Electrical Requirements  
IMPORTANT  
WARNING  
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.  
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.  
n 4.1A Power Accessibility  
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).  
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.  
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.  
4
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR HVAC INSTALLER ONLY  
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 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.  
IMPORTANT  
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 UA-90H and the  
control panel. Be sure to safely route the control wiring to prevent  
damage during installation.  
4.4 Ducting  
IMPORTANT  
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.  
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.  
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.  
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.  
4.4A Fresh Air/Supply Air  
4.3 Condensate (Water) Removal  
IMPORTANT  
DO NOT draw air directly from the kitchen, laundry, or isolated  
basement.  
IMPORTANT  
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'.  
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.  
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  
5
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR HVAC INSTALLER ONLY  
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.  
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  
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.  
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 UA-  
90H 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.  
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.  
IMPORTANT  
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 UA-  
90H. Advantages of this form of ventilation include:  
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.  
Basement Installation: Install a separate 10" return for the UA-  
90H 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.  
4. Exhaust fans are recommended in the bath rooms and  
kitchen.  
6
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR HVAC INSTALLER ONLY  
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 UA-  
90H if you wish to provide optional ventilation air.  
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 UA-  
90H should be located in the remote areas of the structure (such  
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.  
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  
IMPORTANT  
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.  
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.  
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.  
4.5 Noise Abatement  
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.  
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  
Figure 2: Ventilation Timer  
and Humidity Control Panel  
Part No. 4024125  
7
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR HVAC INSTALLER AND HOMEOWNER  
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.  
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.  
Humidity/Fan Control Panel (P/N 4024155) (Figure 1, p.7)  
4.6A  
4.6B  
4.6C  
Humidity/Fan Control Panel WITHOUT Fresh Air  
Ventilation or Damper  
Humidity/Fan Control Panel WITH Fresh Air  
Ventilation and WITHOUT Damper  
Humidity/Fan Control Panel WITH Fresh Air  
Ventilation AND Damper  
4.6D Ventilation Timer and Humidity Control WITH  
Fresh Air AND Motorized Damper  
Refer to sections 4.7 through 4.9C.  
4.6E DEH 2000 Digital Control WITH Fresh Air AND  
Damper  
Refer to Section 5.  
Ventilation Timer/Humidity Control Panel (P/N 4024125)  
(Figure 2, p.7)  
4.6F DEH 2000 Digital Control WITHOUT Fresh Air  
4.6D  
Ventilation Timer and Humidity Control WITH Fresh Air  
AND Motorized Damper  
Refer to Section 5.  
4.7 Humidity Control Adjustment  
Set the humidity control to the desired  
DEH 2000 Digital Control (P/N 4024539) (Figure 1, p.10)  
4.6E  
4.6F  
Digital Controller WITH Fresh Air AND Damper  
Digital Controller WITHOUT Fresh Air  
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 until  
the relative humidity (RH) is reduced to the  
humidity control dial setting. Setting the  
4.6A Humidity/Fan Control Panel WITHOUT Fresh Air  
Ventilation or Damper  
Figure 3  
Humidity Control  
Adjustment Knob  
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.  
humidity control to lower RH levels will NOT  
increase the dehumidification rate; the 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.  
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.  
4.8 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 indoor air  
quality. When the switch is ON; air will be  
constantly filtered through the UA-90H and  
Figure 4  
Fan/Filter Switch  
circulated throughout the house. When the  
switch is OFF the fan will operate only when the humidity control  
calls for dehumidification or when the ventilation timer calls for  
ventilation.  
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.  
8
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR HVAC INSTALLER AND HOMEOWNER  
4.9 Ventilation Timer  
4.9B Ventilation Schedule  
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.  
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  
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.  
Humidity/Fan Control Panel  
Part No. 4024155  
Ventilation Timer & Humidity  
Control Panel  
Part No. 4024125  
4.9C Automatic or Manual Mode  
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.  
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.  
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.  
9
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR HVAC INSTALLER ONLY  
8. Test connections (see Section 2.6)  
5. DEH 3000 Digital Control  
Installation Instructions  
Control Part No. 4026570  
5.1 Specifications  
Part # (P/N)  
Model:  
4026570  
DEH 3000 Digital Control  
24 VAC  
Electrical:  
Humidity Range:  
Humidity Accuracy:  
Output:  
Relay Capacity  
Temp Range/Accuracy  
Size  
10 – 95% RH  
+/- 5%  
3 Amps 24 VAC  
5 Amps  
2%  
4.95" wide x 4.19" high  
5.2B Wiring  
FOR HVAC INSTALLER ONLY:  
WARNING:  
DO NOT ALLOW THE YELLOW LEAD  
FROM THE ULTRA-AIRE TO CONTACT THE RED OR WHITE LEADS  
FROM THE ULTRA-AIRE OR DAMAGE TO THE TRANSFORMER  
WILL RESULT  
5.2 Installation  
This control panel must be installed in the conditioned space  
and in accordance with all applicable codes and standards.  
Follow the instructions below when installing and setting this  
control.  
WARNING:  
UNPLUG ULTRA-AIRE BASE UNIT  
BEFORE WIRING CONTROL.  
The installer must supply the wiring between the Ultra-Aire  
and the control panel. Be sure to safely route the control wires  
to prevent damage during installation. Be careful not to cross  
the wires when connecting the Ultra-Aire and the remote  
control panel or damage to the transformer may result.  
5.2A Install Instructions  
1. Separate the front panel from the back panel by  
depressing the middle sections of the top and bottom of  
the front panel.  
2. Line the back panel up against the wall or flat surface  
onto which it is to be mounted and drill in the appropriate  
mounting holes.  
3. Insert the screws and tighten down so they extend  
approximately 1/8” from the back plate.  
4. Align the back panel so that the control is level.  
5. Tighten the screws to lock into position.  
6. Make the electrical connections to the terminals on the  
back panel as shown in the wiring diagram.  
7. Reassemble the front to the back panel. Connect at the top  
first, then at the bottom.  
The remote control of the Ultra-Aire is powered by a low  
voltage circuit (24 VAC) and must NEVER contact or be  
connected to a high voltage circuit. Some of the control wires  
leaving the Ultra-Aire may not be used with certain control  
panels and should be left safely disconnected with wire nuts  
taped onto the stripped ends. Be sure to consult the electrical  
schematic in this manual or on the front panel of the Ultra-  
Aire before making the control connections.  
10  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR HVAC INSTALLER ONLY  
Dehumidification  
Operation  
COM/NO  
CLOSED  
OPEN  
COM/NC  
OPEN  
UA Base Unit  
White  
ON  
OFF  
CLOSED  
Common uses (assuming standard thermostat wiring color  
schemes as noted):  
Disengage A/C during dehumidification  
Redirect the yellow thermostat wire to the NC  
terminal. Wire the yellow wire from the A/C to the  
COM (B) terminal.  
DEH 3000 Wiring Diagram  
Engage A/C during dehumidification  
DMP COMP FAN  
Connect a wire from the “R” terminal on the the  
thermostat to the “com” terminal on the DEH 3000.  
Connect a wire from the “NO” terminal on the DEH  
3000 to the “Y1” terminal on the thermostat.  
WARNING:  
TO AVOID TRANSFORMER DAMAGE  
ONLY CONNECT WHITE WIRE TO CONTROL IF DAMPER IS USED.  
5.2D Dehumidifier lockout/activation AC sensor  
The control has the ability to activate the dehumidifier or  
deactivate the dehumidifier when the air conditioner is  
running.  
The white wire controls the optional motorized damper  
that can be installed into a fresh air duct. This provides  
the ability to control when fresh air is introduced into the  
building by using the ventilation timer function labeled  
“DMP” on the control (See Section 3.7). If the motorized  
damper is not used, DO NOT CONNECT THE WHITE WIRE  
TO THE CONTROL OR DAMAGE TO THE TRANSFORMER  
MAY RESULT. Simply leave the (DMP) terminal unused if  
the damper is not used, and cap off the white lead fro mthe  
Ultra-Aire base unit.  
5.2C Auxiliary relay operation  
At times it may be desirable to coordinate fan operation  
of the central heating/cooling system with dehumidifier  
operation. The DEH 3000 features a relay that provides  
this ability. The relay terminals labeled NC, COM and  
NO operate according to the following chart:  
Standard wire colors for thermostats are as follows:  
Description  
24VAC Return  
Call for Heat  
Force Fan On  
Color  
Red  
Terminal code  
R
White  
Green  
W or W1  
G
Compressor  
Call for Cooling  
Yellow  
Y or Y1  
11  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR HVAC INSTALLER ONLY  
DEHUMIDIFIER DEACTIVATES WHEN THE  
AIR-CONDITIONER IS RUNNING  
• The common wire on the thermostat transformer  
(black) needs to be wired with the yellow wire from the  
dehumidifier.  
motorized damper in series with these connections, or the  
white wire must not be connected to the control. Mis-wiring  
may result in transformer damage.  
After connections have been verified, this short test will  
confirm proper wiring.  
• The Red wire on the thermostat needs to be wired with  
the Yellow wire from the dehumidifier.  
1. Install front cover of control; insert at top first, then bottom.  
2. Plug in Ultra-Aire base unit. The control should power up.  
3. Turn control on by pressing the ON/OFF button.  
• The Yellow wire from the thermostat must be wired to the  
AC off sensor terminal.  
4. Engage dehumidification operation by adjusting RH  
setpoint below ambient conditions.  
DEHUMIDIFIER  
a. Press RH until RH setpoint is 20%.  
BLACK  
b. Verify Ultra-Aire fan and compressor operation.  
c. Verify ventilation damper (if used) is closed.  
YELLOW  
RED  
AIR CONDITIONER  
TRANSFORMER  
THERMOSTAT  
5. Verify fan only operation by disengaging dehumidification and  
operating fan:  
YELLOW  
a. Adjust RH setpoint above ambient conditions by pressing and  
holding RH until set point is 80%.  
DEHUMIDIFIER ACTIVATES WHEN THE  
AIR-CONDITIONER IS RUNNING  
b. Press fan button, then press again to toggle fan to “ON”  
setting.  
• The common wire on the thermostat transformer  
(black) needs to be wired with the yellow wire from the  
dehumidifier.  
c. Release fan button, then press again to toggle fan to “ON”  
setting until “FAN” flashes on display.  
d. Verify fan operation of Ultra-Aire. No compressor operation  
should be noted, and ventilation damper (if used) should be  
closed.  
• The Red wire on the thermostat needs to be wired with  
the Yellow wire from the dehumidifier.  
6. Verify ventilation damper operation (if installed) by disengaging  
from operation and engaging ventilating operation.  
• The Yellow wire from the thermostat must be wired to the  
AC on sensor terminal.  
a. Press and hold fan button until “FAN” flashes on display.  
b. Release “FAN” button, then press again to toggle fan  
DEHUMIDIFIER  
operation off.  
BLACK  
YELLOW  
c.Press and hold “VENT” button until“VENT” flasheson display.  
RED  
d. Release “VENT” button, then press again until “OPEN” is  
AIR CONDITIONER  
TRANSFORMER  
displayed.  
YELLOW  
THERMOSTAT  
e. Verify Ultra-Aire fan operation and ventilation damper is open,  
with no compressor operation.  
7. If any functions are not working properly, verify wiring and  
connections. Meters may be used across terminals to verify voltage.  
If there is a concern about the base unit not operating properly, the  
leads exiting the base unit may be connected and operation verified  
according to the following matrix:  
5.2E Location  
Install the remote control panel in a central area of the  
structure where it will sense the relative humidity of the  
structure accurately. Do not install the control panel where it  
may not accurately sense the relative humidity such as near  
HVAC supply registers, near exterior doors and windows, or  
near a pool or spa.  
Wire connections  
Yellow & Blue  
Operation  
Fan & Compressor  
Fan Only  
Yellow & Green  
5.2F Testing  
Do not test any other connections or transformer damage  
may result. Refer to the appropriate Ultra-Aire base unit  
manual for additional information.  
After wiring connections have been made, verify connections.  
First, make sure the white wire from the base unit is not  
wired directly to the DEH 3000 control. There must be a  
12  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR HVAC INSTALLER AND HOMEOWNER  
8. Verify additional optional control operations such as fan interlock  
or lockout.  
9. Proceed to operation/setting section.  
FOR INSTALLER & HOMEOWNER:  
5.3 Operation  
5.3A Display  
• When there is power to the control, the control display will  
show the time, day, humidity, and temperature.  
• When the control is turned on, the setpoint, fan status,  
auto/hold mode, and fresh air vent status is displayed.  
• When a key is pressed the display will light.  
• The “TIME” and “DAY” is displayed at the top of  
the screen.  
• RH and Temperature are displayed in real time.  
• An “  
is operating the device.  
• A flashing “ ” before the set point, vent, or fan indicates  
O” before the set point, vent, or fan indicates the unit  
O
5.3D Setting Clock Time  
the unit is in a delay prior to operating the device.  
1. Press and hold the “CLOCK” button. The hour display  
will flash. Release the button.  
Note: Delay is an intentional factory installed time delay  
cycle that is meant to prevent short cycles, extending the  
life of the Ultra-Aire. If a delay is encountered, WAIT 10  
MINUTES BEFORE EXPECTING NORMAL OPERATION.  
2. Use the “UP/DOWN RH” buttons to change the value.  
3. Press the “CLOCK” button again and the minute display  
will flash. Use the RH buttons to change the value.  
4. Press the “CLOCK” button again and the AM/PM” display  
will flash. Use the RH buttons to toggle the value.  
5. Press the “CLOCK” button again and the day display will  
flash. Use the “RH” buttons to change the value.  
5.3B Setting  
During the set-up process, if you make a mistake, simply  
continue. You can always go back to adjust the settings. If  
you leave the control alone and don’t touch any buttons for  
10 seconds, the control will remember any changes made  
and return to “home.”  
If the “CLOCK” button is pressed again or no button is  
pressed for 5 seconds, the display will automatically return to  
“home.”  
5.3C On/Off Setting  
Press the “ON/OFF” button to turn the system on or off.  
When the system is on, the setpoint, fan status, auto/hold  
mode, and fresh air vent status is displayed. In the off  
mode, the control will show the time, day, humidity, and  
temperature. When the unit is shipped, it is in manual mode.  
5.3E Setting Relative Humidity Setpoint  
The relative humidity setpoint (the average RH that is  
maintained) operates the dehumidifier function of the Ultra-  
Aire. It has no effect on any other function of the unit. The  
control senses the ambient relative humidity of the space in  
which it is located.  
13  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR HVAC INSTALLER ONLY AND HOMEOWNER  
Operation  
continuously are filtration and air recirculation.  
The initial dead band setting (the range that the dehumidifier  
cycles on and off) is 3%. With a setpoint of 50%, the dumidifier  
turns on when the reading reaches 53%. The dehumidifier  
continues to remove water from the air until the reading is  
47%. The dehumidifier remains off until the reading is 53%.  
“AUTO” – indicates the fan will run when the control calls for  
dehumidification or ventilation. If the control has not called for  
dehumidification for 3 hours, the control will automatically run  
the fan for 10 minutes. The fan must run a specific amount of  
time per day. This helps to keep the dehumidifier dry.  
AMBIENT RH  
After dehumidification cycle, fan automatically shuts off for 10  
minutes.`  
To set the operation:  
1. Press and hold the “FAN” button. The current fan setting  
will begin to flash. Release the button.  
2. Press the “FAN” button to toggle between the “ON” and  
“AUTO” modes.  
CURRENT SETPOINT  
If the setpoint is equal to or greater than the current ambient  
condition, the space does not need to be dried so the  
dehumidifier function will be off.  
Example: Setpoint: 50% RH  
Current condition: 45% RH = Dehumidifier off, the “  
O”  
indicator will not be shown.  
FAN MODE  
(Auto or On)  
If the setpoint is less than the ambient condition, the  
dehumidifier will be on and the red “DEHU” indicator will be  
lit. Since the space is more humid than the set point, the  
controller operates the dehumidifier to dry the space.  
An “  
indicator indicates the fan is in a wait mode and will  
operate shortly. No “ ” indicates the fan is off.  
Oindicator indicates the fan is operating. A flashing  
O  
O
Example: Setpoint: 50% RH  
Current condition: 55% RH = Dehumidifier on, the “  
indicator will be shown.  
With the fan in the “AUTO” mode, the fan will operate only  
when needed by other functions of the system. The fan  
will remain off unless the system is dehumidifying and/or  
ventilating. The fan always runs during dehumidification and  
ventilation and the fan Oicon will be lit. To completely turn  
the system off, use the “ON/OFF” button as described earlier.  
O”  
To set the relative humidity setpoint, press up or down “RH”  
buttons to adjust the relative humidity setpoint as desired.  
Therma-Stor recommends relative humidity levels not exceed  
50% in the summer, and 25-35% in the winter if you live  
in a cold climate. It is not recommended that the humidity  
setpoint be set below 35%. In order to dry the home in the  
winter in a cold climate, use the ventilation function of the  
system rather than the dehumidifier function. Call the factory  
or refer to the owner’s manual for more information.  
To adjust the ventilation mode see Section 3.7.  
5.3G Damper Operation and Setting (Ventilation)  
Manual/Hold Mode  
Ultra-Aire units can be installed to incorporate optional ventilation.  
The damper setting controls the ventilation function of the system.  
It has no control over the dehumidification function, although  
the ventilation function can and should be used to dry the space  
depending on the climate and the outside air conditions. Refer to  
the appropriate Ultra-Aire manual for more information.  
5.3F Fan Setting and Operation  
Use the “FAN” button to adjust the fan operation. There are  
2 choices for fan operation: “ON” or “AUTO.”  
“ON” – indicates the fan of the Ultra-Aire will run  
In order to provide ventilation, the damper must be open (“ON”)  
and the fan must be running.The controller takes care of these  
two functions automatically, so that whenever the damper is open  
(“ON”), the fan is running.  
continuously. This does not affect either the dehumidification  
or ventilation functions of the system. In other words, the  
system may or may not be ventilating or dehumidifying while  
the fan is running. Common reasons for operating the fan  
14  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR HVAC INSTALLER ONLY AND HOMEOWNER  
There are two programs available for ventilation Monday  
through Friday. There are also two programs for Saturday and  
Sunday. No other choice of days is available.  
The ventilation indicator “  
is ventilating.The fan operation indicator “  
O
will be displayed whenever the unit  
Owill also be lit.  
There are three damper operation modes, “OPEN HOLD,”  
“CLOSED – HOLD” and “PROGRAM” (denoted by “ON TIME”  
“OFF TIME.” Refer to section 3.8).With the damper in the  
“OPEN HOLD” mode, the damper will be open and the fan of  
the system will be operating in order to introduce fresh air into  
the space. Use this mode for continuous fresh air ventilation.The  
fan is always on when the damper is open.When in “CLOSED  
– HOLD” mode, the damper will not open and the system will not  
ventilate.  
Each program has:  
• A “START” time of day when the ventilation schedule  
begins.  
• An “OPEN FOR” duration for the amount of time the  
damper stays open in 5 minute intervals, from 0 to 60.  
• A “CLOSED FOR” duration which closes the vent for a  
specified time in 5 minute intervals from 0 to 60.  
Example:  
1. Press “PROGRAM ENTER” button. The following menu  
When in theprogrammode, the control will operate the damper  
and fan (ventilate) according to the programmed ventilation  
schedule (See Section 3.8).  
appears:  
To set the damper operation:  
1. Press the “VENT” button.The current setting will begin to  
flash on the display. Release the button.  
2. Press the “VENT” button again to toggle between “OPEN,”  
“CLOSED” and “PROGRAM.”  
3. Leave the control alone for 10 seconds to select the indicated  
damper mode and return to “HOME.”  
2. Using the up/down RH buttons, select “PROGRAM.” The  
following menu appears:  
5.3H Intermittent or Programmed Ventilation  
You can select from:  
This example shows the damper in “PROGRAM” mode  
(denoted by the schedule 15 minutes on, 5 minutes off).  
“MON-FRI”or “SAT-SUN” for separate weekday/weekend  
schedules or “MON-SUN”which gives you equal weekday/  
weekend schedules.  
Menu when you select “MON-FRI” or SAT-SUN”:  
The status of the damper is show here.  
is open, blank is closed.  
The system will operate the ventilation function according to the  
current ventilation program.The control needs to be programmed  
to turn the ventilation function on and off at the desired intervals.  
This is done by programming the ventilation timer.  
1. Enter the starting time for weekdays using the up/down  
RH keys to change the time.  
15  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR HVAC INSTALLER AND HOMEOWNER  
2. Press the program enter key to toggle to the “open for”  
setting. Using the up/down “RH” keys, change the  
duration that the damper will ventilate fresh air.  
feature will not need to be used. If temperature cutout is desired,  
program the setpoint by pressing the “PROGRAM ENTER”  
button. Press RH until “TEMP CUTOUT” is flashing. Use “RH”  
up or “RH” down to adjust setpoints.  
3. Press the program enter key to toggle to the “closed  
for” setting. Using the up/down “RH” keys, change the  
duration that the damper will remain closed between  
ventilation.  
5.3J Default Settings  
Upon initial power-up or after prolonged power outages (more  
than 30 minutes), the DEH 3000 is programmed with the  
following defaults.A space is provided to make note of user  
inputs.  
For the example given, starting at 8:00AM in the morning,  
the control will ventilate fresh air for 15 minutes then stop for  
15 minutes. This schedule of 15 minutes open; 15 minutes  
closed will continue until the start time of the night schedule.  
Setting  
Default  
My Setting  
Press “PROGRAM ENTER” again to go to the “MON-FRI”  
night schedule. Repeat the steps listed above for this and the  
“SAT-SUN” day and night schedules.  
RH setpoint  
50%  
__________  
__________  
__________  
__________  
Ventilation Operation  
Fan Setting  
Closed  
Auto  
80%  
When you return to the main program menu, use the  
up/down “RH” buttons to select “RUN PROGRAM.”  
Temp Cutout  
If you have questions about the  
DEH 3000, please call Therma-Stor LLC  
at 1-800-533-7533 or email us at  
Press “PROGRAM ENTER” to run the program. The  
display will appear as follows:  
Vent schedule  
Program  
on time/off time  
RUN mode  
5.3I Temperature Cutout Programming  
Ultra-Aire units produce heat when dehumidifying. Depending  
on outside conditions, the ventilation function may introduce  
warm air into the space. Occasionally, the operation of the  
Ultra-Aire may produce enough heat to drive temperatures up.  
The temperature cutout feature disables all Ultra-Aire operations  
if temperatures reach cutout setpoint. In most installations this  
16  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ATTENTION INSTALLER  
WIRE THE UNIT AND CONTROL PACKAGE AS SHOWN IN THE DIAGRAM BELOW  
Humidity/Fan Control Panel  
Humidity  
Control  
D.BLU-5  
YEL-2  
Blower  
Switch  
GRN-6  
PNK  
GRN-6  
WHT-1  
RED-3  
YEL-2  
Dehumidifier  
D.BLU-5  
Control Part No. 4024155  
Do not connect these leads  
directly together or damage  
to the transformer will result.  
Ventilation Timer/  
Humidity Control Panel  
Optional  
Damper  
Humidity  
Control  
D.BLU-5  
YEL-2  
VIO-4  
ORG  
GRN-6  
L.BLU  
PNK  
REd-3  
GRN-6  
WHT-1  
RED-3  
YEL-2  
GRY  
Control Part No. 4024125  
Dehumidifier  
D.BLU-5  
DEH 3000 Digital Control  
UA Base Unit  
White  
DMP COMP FAN  
Control Part No. 4026570  
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.  
17  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
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.  
18  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ULTRA-AIRE 90H WIRING DIAGRAM  
8. Wiring Diagrams  
UA-90H with Humidity/Fan Control  
(4024155)  
UA-90H with Ventilation Timer/Humidity/  
Fan Control (4024125)  
19  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR HVAC INSTALLER ONLY  
9. Optional Parts List: UA-90H Indoor Air Quality System  
Item  
1
Part No.  
4024125  
4024155  
4026570  
4025287  
4026151  
4024369  
4024370  
4026451  
4026450  
4020646  
4023660  
4023672  
4024153  
4021495  
4024150  
4024122  
4020554  
4022486  
Description  
Control Panel Assembly, Ventilation Timer & Humidity Control  
Control Panel Assembly, Humidity/Fan  
DEH 3000 Digital Controller  
2
3
4
Filter Box  
5
14"x14"x1" Standard UA 90-H Filter  
2"x20"x24" Filter (not shown) Use only with Filter Box  
4"x20"x24" Filter (not shown) Use only with Filter Box  
Condensate Pump Kit/UA-90H (not shown)  
Leveling Foot Kit/UA-90H (not shown)  
10" Backdraft Damper (not shown)  
Controller, Humidity  
6
7
8
9
10  
11  
12  
13  
14  
15  
16  
17  
18  
Duct Damper, 6" Diameter, Electrically Actuated (not shown)  
Cover for Items 1 & 2 (not shown)  
Knob, Black, .25" shaft  
Instructions, Humidity/Fan (not shown)  
Instructions, Ventilation Timer & Humidity (not shown)  
Switch, Black, SPDT, On/Off  
Timer, 7-Day, 24 Vac, Programmable  
Item 3: DEH 3000 Digital Control  
20  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR HVAC INSTALLER ONLY  
10. Service Parts List: UA-90H Indoor Air Quality System  
Item  
1
Part No.  
4023648  
Description  
Compressor, Carlyle (EAA070111A)  
2
3
4
5
6
7
8
4023681  
4022484  
4024912  
4025561  
4020924  
4022487  
4025544  
Compressor Overload (EAA070111A)  
Compressor Relay, SPST, 24 Vac, 30A  
Compressor Run Capacitor, 25 MFD  
Fan  
Fan Relay, SPDT, 24 Vac, 15A  
Transformer, 120/24 Vac, 40 VA  
Condenser, Evaporator, Strainer & Capillary Tube Assembly  
FOR HOMEOWNER - ROUTINE MAINTENANCE  
Item  
1
Part No.  
4026151  
Description  
14"x14"x1" Standard UA 90-H Filter  
2
3
4024369  
4024370  
2"x20"x24" Filter (not shown) Use only with Filter Box  
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.  
21  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR HVAC INSTALLER ONLY  
11.2 Troubleshooting  
No dehumidification, neither fan nor compressor run with fan  
11. Service  
switch and ventilation timer OFF.  
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.  
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.  
11.1 Technical Description  
No dehumidification, compressor does not run but fan runs  
with fan switch and ventilation timer OFF and humidity control  
turned to ON.  
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.  
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.  
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.  
Refrigeration System of UA-90H  
Fan runs with fan switch ON. Fan does not run with ventilation  
timer activated.  
1. Defective ventilation timer.  
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  
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.  
22  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
FOR HVAC INSTALLER ONLY  
Unit not providing ventilation. Ventilation timer not operating  
correctly.  
11.4 Compressor/Capacitor Replacement  
This compressor is equipped with a two terminal external overload  
1. If timer is not functioning correctly reset timer and reprogram.  
2. Check control wire connections (check connections at fresh  
air damper also).  
and a run capacitor, but no start capacitor or relay.  
3. Defective fresh air damper.  
4.Defective fan switch.  
CAUTION  
CAUTION-ELECTRICAL SHOCK HAZARD: Electrical power must  
be present to perform some tests. These tests should be  
performed by a qualified service person.  
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.  
11.5 Electric Ventilation Damper  
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.  
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.  
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!  
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  
6. Turn on the fan switch; the fan should run. Turn off the fan  
switch.  
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.  
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.  
23  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
CONDENSATE PUMP INSTALLATION: FOR HVAC INSTALLER ONLY  
24  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
CONDENSATE PUMP INSTALLATION: FOR HVAC INSTALLER ONLY  
25  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
CONDENSATE PUMP INSTALLATION: FOR HVAC INSTALLER ONLY  
26  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
CONDENSATE PUMP INSTALLATION: FOR HVAC INSTALLER ONLY  
27  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
CONDENSATE PUMP INSTALLATION: FOR HVAC INSTALLER ONLY  
28  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
CONDENSATE PUMP INSTALLATION: FOR HVAC INSTALLER ONLY  
29  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
ULTRA-AIRE 90H Dehumidifier Limited Warranty  
LIMITATIONS AND EXCLUSIONS: This warranty does  
not cover any defect, malfunction, etc. resulting from  
misuse, abuse, lack of normal care, corrosion, freezing,  
tampering, modification, unauthorized or improper repair  
or installation, accident, acts of nature or any other cause  
beyond Therma-Stor LLC’s reasonable control. This  
excludes charges incurred installing and removing Ultra-  
Aire 90H for repair.  
WARRANTOR:  
Therma-Stor LLC  
PO Box 8680  
Madison, WI 53708  
Telephone: 1-800-533-7533  
WARRANTY: This warranty covers the Ultra-Aire 90H  
and extends only to the original residential end-user of  
the Ultra-Aire dehumidifier, and may not be assigned or  
transferred.  
If any Ultra-Aire 90H part is repaired or replaced, the  
new part shall be warranted for the balance of original  
warranty (but all warranty periods will be extended by  
the period of time, if any, that the Ultra-Aire 90H is out  
of service while awaiting covered warranty service).  
Warranty service will be performed during normal  
working hours.  
Year(s) One through Two - 100% parts and labor (all  
components). Therma-Stor LLC warrants that, for two  
(2) years the Ultra-Aire 90H dehumidifier will operate  
free from any defects in materials and workmanship,  
or Therma-Stor LLC will, at its option, repair or replace  
the defective part(s), free of any charge. This excludes  
charges incurred installing and removing the Ultra-  
Aire 90H for repair.  
UPON THE EXPIRATION OF THE WRITTEN WARRANTY  
APPLICABLE TO THE ULTRA-AIRE DEHUMIDIFIER OR  
ANY PART THEREOF, ALL OTHER WARRANTIES IMPLIED  
BY LAW, INCLUDING MERCHANTABILITY AND FITNESS  
FOR A PARTICULAR PURPOSE, SHALL ALSO EXPIRE. ALL  
WARRANTIES MADE BY THERMA-STOR LLC ARE SET  
FORTH HEREIN, AND NO CLAIM MAY BE MADE AGAINST  
THERMA-STOR LLC BASED ON ANY ORAL WARRANTY. IN  
NO EVENT SHALL THERMA-STOR LLC, IN CONNECTION  
WITH THE SALE, INSTALLATION, USE, REPAIR OR  
REPLACEMENT OF ANY ULTRA-AIRE DEHUMIDIFIER OR  
PART THEREOF BE LIABLE UNDER ANY LEGAL THEORY  
FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL  
DAMAGES INCLUDING WITHOUT LIMITATION WATER  
DAMAGE (THE END-USER SHOULD TAKE PRECAUTIONS  
AGAINST SAME), LOST PROFITS, DELAY, OR LOSS OF USE  
OR DAMAGE TO ANY REAL OR PERSONAL PROPERTY.  
Year(s) Three through Five - Therma-Stor LLC  
further warrants for a period of five (5) years, the  
condenser, evaporator, and compressor of the  
Ultra-Aire 90H dehumidifier will operate free of any  
defects in material or workmanship, or Therma-Stor  
LLC, at its option, will repair or replace the defective  
part(s). This excludes charges incurred installing and  
removing Ultra-Aire 90H for repair.  
USER RESPONSIBILITIES: Warranty service must be  
performed by a servicer authorized by Therma-Stor LLC.  
To obtain warranty service you must obtain a return  
material authorization (RMA). To obtain an RMA you must  
present proof of purchase or (lease), by use of a warranty  
card, original sales receipt or other reasonable and  
reliable means.  
Some states do not allow limitations on how long an  
implied warranty lasts, and some do not allow the  
exclusion or limitation of incidental or consequential  
damages, so one or both of these limitation may not  
apply to you.  
To obtain an RMA call Therma-Stor LLC at the above  
number and ask for the Therma-Stor LLC Service  
Department, which will then issue an RMA# and arrange  
for, at our option, either repair or replacement.  
LEGAL RIGHTS: This warranty gives you specific legal  
rights, and you may also have other rights which vary  
from state to state.  
FREIGHT: Freight to and from the servicer is the  
responsibility of the end-user. The end-user is  
responsible for normal care and proper return packaging.  
30  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  
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. © 2006 Therma-Stor LLC. All rights reserved.  
PO Box 8680 • Madison, WI 53708  
Phone: 608-222-5301 • Fax: 608-222-1447  
Ultra-Aire 90H Installer’s & Owner’s Manual  
Download from Www.Somanuals.com. All Manuals Search And Download.  

Telex Network Card BTR 200 Series User Manual
Toshiba Oxygen Equipment ST A10 User Manual
Toshiba VCR 5205 S705 User Manual
Triarch Indoor Furnishings 31120 2 User Manual
Troy Bilt Snow Blower 769 04000A User Manual
Uniden Cordless Telephone DCX400 User Manual
Unimac Washer UX55 User Manual
ViewSonic Car Video System CDE4600 L User Manual
VTech Cordless Telephone VT 9241 User Manual
Wasp Bar Code Scanner CCD Scanner User Manual