INSTALLER’S & OWNER’S MANUAL
HVAC INSTALLER: PLEASE LEAVE MANUAL FOR HOMEOWNER
P/N 4026480 • Serial No.___________________________
Fresh Air Ventilation
Dehumidification
The highly efficient Ultra-Aire XT150H 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 a significant increase in 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 of the
air leaving the unit.
Optional fresh outdoor air may be ducted to the unit via a six inch
round duct. This provides fresh air to dilute pollutants and maintain
high oxygen content in the air. The amount of fresh air ventilation
can be regulated by a variety of dampers and controls.
Air Filtration
The Ultra-Aire XT150H includes air filtration to improve indoor air
quality. A MERV-11 media filter is standard. An optional external
MERV-14 deep pleated 95% media filter is available for optimum air
filtration and to reduce potentially harmful airborne particles. If the
optional filter is chosen, a standard filter operates as a prefilter.
The Ultra-Aire XT150H is controlled by 24 volt remote wired controls.
A variety of controls are available suitable to various applications.
© 2007 Therma-Stor LLC • Manual P/N TS-372, 8/07
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SAFETY PRECAUTIONS
1. 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 XT150H 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 back or side panels
for maintenance and service. DO NOT INSTALL UNIT WITH THE
SERVICE PANELS 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, be splashed and that it is plugged into a
GFI GROUND FAULT INTERRUPT OUTLET.
• DO NOT use the device as a bench or table.
• DO NOT place the device directly on structural members. Provide
vibration isolation in order to minimize operational vibration
and/or noise.
• 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
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Place the Ultra-Aire XT150H on supports that raise the base of
the unit above the top of the flanges on the drain pan beneath it.
Raising the Ultra-Aire XT150H will help the unit drain with gravity
flow. Do not place the Ultra-Aire XT150H directly on structural
building members without vibration absorbers or unwanted noise
may result.
1. Intended Application for Ultra-Aire XT150H
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. Specifications
The Ultra-Aire XT150H may be suspended with steel hanger straps
(plumbers tape) or a suitable alternative from structural members,
unit must be supported from underneath. Don't hang from sides
or ends. 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.
Model:
Ultra-Aire XT150H
Indoor Air Quality System
Electrical:
110-120 VAC, 6.9 Amps, 60 Hz,
grounded
Water Removal Capacity: 150 pints/day @ 80°F, 60% RH
Operating Temp. Range:
Air Flow:
56°F min., 100°F max.
415 CFM @ 0.0" WG
365 @ 0.4" WG
The Ultra-Aire XT150H should be located near the existing air
handling system to minimize the required ductwork for connecting
the Ultra-Aire XT150H to the existing air handling system. The
controls for the Ultra-Aire XT150H are remote from the unit and
must be located in the space that is to be conditioned. The controls
are low voltage (24 volt) and should be connected to the Ultra-Aire
XT150H with low voltage thermostat cable.
Refrigerant Charge:
2 lb., R-410.A
Duct connections:
(ovaled)
Round 10" & 6" inlets, 10" outlet
Filter Size:
2" X 16" X 16"
If fresh air ventilation is desired, thought should be given to the
location for the fresh air ducting. A 6" round insulated duct will
have to be installed on the Ultra-Aire XT150H and run to the outside
of the structure to bring in fresh air. Use an 8" insulated round duct
for lengths of more than 50 feet or if more than 100 CFM is needed.
Consult local codes for necessary distances from exhaust ports
when installing fresh air return.
Size (w/o duct collars):
Unit Weight:
37" wide X 22" high X 20 5/8" deep
134 lbs.
3. Installation
3.1 Location
The Ultra-Aire XT150H can be installed in a variety of locations
to meet the owner's needs as listed below. In all cases keep the
following cautions in mind:
3.2 Electrical Requirements
WARNING: DO NOT ALLOW THE YELLOW LEAD FROM THE
ULTRA-AIRE TO CONTACT THE RED LEAD OR WHITE LEAD FROM
THE ULTRA-AIRE OR DAMAGE TO THE TRANSFORMER WILL
RESULT.
• It is designed to be installed INDOORS IN A SPACE THAT IS
PROTECTED FROM RAIN AND FLOODING.
• Install the unit with space to access the back and side panels for
maintenance and service and also to allow easy access to the filter
cover panel. DO NOT INSTALL UNIT WITH THE FRONT PANEL OR
FILTER COVER PANEL INACCESSIBLE.
The Ultra-Aire XT150H plugs into a common grounded outlet. It
draws around 6.9 Amps under normal operating conditions. If used
in a wet area (pool, spa room, or basement prone to flooding), a
ground fault interrupter protected circuit is required.
• Avoid discharging the air directly at people, or over the water in
pool areas.
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, or near a pool or spa. The installer must supply the
wiring between the Ultra-Aire XT150H and the control panel. Be
sure to safely route the control wiring to prevent damage during
installation. Be careful not to cross the wires when connecting the
Ultra-Aire XT150H and the remote control panel or damage to the
transformer may result.
• If used near a pool or spa, be certain there is NO chance the unit
could fall into the water or be splashed and that it is plugged into a
GROUND FAULT INTERRUPTER.
• DO NOT use the Ultra-Aire XT150H as a bench or table.
• DO NOT place the Ultra-Aire XT150H directly on structural
members. Provide vibration isolation in order to minimize
operational vibration and/or noise.
• 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.
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The remote controls of the Ultra-Aire XT150H are powered by a low
voltage circuit (24 Vac) and must NEVER contact or be connected
to a high voltage circuit. The control wires leaving the Ultra-Aire
XT150H and the remote control panels are numbered and color-
coded to prevent confusion. Some of the control wires leaving the
Ultra-Aire XT150H 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 inside the access panel of the Ultra-Aire XT150H before
making the control connections.
may draw air from a basement that is open to the home. All flexible
ducting connected to the Ultra-Aire XT150H should be UL listed.
The inlet of the Ultra-Aire XT150H is the 10" diameter hole in the
filter enclosure of the unit. A 10" round collar is supplied with the
unit to attach to round duct. The duct may be permanently attached
to the collar. A 6" round collar is provided with the unit to attach to
the 6" hole in the filter enclosure. The 6" collar should be capped
if fresh make-up air is not desired. If fresh make-up air is desired,
see Section 3.4C.
A 10" round (ovaled) collar is supplied with the unit for the outlet of
the Ultra-Aire XT150H.
3.3 Condensate Water Removal
Condensate drains by gravity via the drain port. Use 3/4" male NPT
PVC pipe. Route drain pipe to drain. Install a trap if possible. Take
care when installing drain pipe to drain port. Use an adjustable
wrench to secure the drain port. An optional condensate pump kit
may be installed if a lift is required to dispose of the condensate.
The condensate pump kit can be ordered directly from the factory.
See the optional parts list for information on the kit.
A length of flexible ducting on all Ultra-Aire XT150H duct
connections is recommended to reduce noise and vibration
transmitted to rigid ductwork in the structure.
Ducting the Ultra-Aire XT150H as mentioned in Sections 3.4A-3.4G
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.
External drain trap on unit
is recommended
Isolated Areas: Effective dehumidification may require that ducting
be branched to isolated, stagnant 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.
1.00"
Connecting to existing HVAC systems: An optional 10" check
damper is available from the factory to prevent reverse flow
through the Ultra-Aire XT150H. If the Ultra-Aire XT150H is ducted
to the supply ducting air handler, it is recommended that the check
damper be placed in the Ultra-Aire XT150H supply duct. Contact
the factory when connecting to a static pressure of greater than or
equal to +.5" WG.
3.4 Ducting
3.4A Installing Duct Collars
The Ultra-Aire XT150H is equipped with 10" and 6" round inlet
collars and a 10" round (ovaled) exhaust collar. Follow instructions
included with collars.
3.4B Ducting for Dehumidification
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 Ultra-Aire XT150H into the supply of the existing
heating system. If the existing heating system incorporates a
central supply, installation of a separate supply duct from the Ultra-
Aire XT150H to each isolated area is recommended. DO NOT draw
air directly from the kitchen, laundry, or isolated basement. You
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3.4C Ducting for Fresh Air
3.4D Installation in a Basement or Crawlspace
with an Existing Forced Air HVAC System
Fresh air can be brought into the structure by connecting an
insulated duct from outside to the 6" Ultra-Aire XT150H inlet and
by turning on the fan switch or activating the humidity control (on
units with the humidity control panel). Activate the ventilation timer
on units with the ventilating and humidity control panel to bring in
fresh air. Refer to Section 4.5 for programming instructions for the
ventilation timer. Advantages of this form of ventilation include:
It is recommended that a new, separate return duct be installed for
the Ultra-Aire XT150H from a central area of the house. If this is not
possible, and if the existing system has multiple returns, select one
to disconnect from the existing forced air system and use it for the
dedicated Ultra-Aire XT150H 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.
1. Outside air is filtered before entering the building.
2. Outside air will be dehumidified before entering if the Ultra-
Aire XT150H 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 make-up air for
open combustion and exhaust devices like the clothes drier,
fireplace, and water heater.
4. Adequate 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.
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.
If the structure in which the Ultra-Aire XT150H is to be installed has
an existing forced air HVAC system, utilize the HVAC system to make
the Ultra-Aire XT150H installation easier.
Basement Installation: Install a separate 10" return for the Ultra-
Aire XT150H in a central area of the structure. Duct the supply of the
Ultra-Aire XT150H to an optional 10" x 10" x 10" tee/damper that
is 20% open to the basement. This allows the ability to discharge a
variable amount of dehumidified air into a basement that may not
be well served by the existing duct system. Duct the other side of
the tee to the air supply of the existing HVAC system. A backdraft
damper is required in the duct between the 10" tee and the central
supply duct to prevent air from being discharged into the basement
during central fan operation. Connect a duct from outside to the
6" collar of the Ultra-Aire XT150H if you wish to provide fresh air
ventilation.
An insulated 6" diameter duct is generally sufficient to provide up
to 125 CFM of outside air. Large quantities of outside air will either
positively or negatively impact the performance of the Ultra-Aire
XT150H, depending upon inside and outside air conditions. Consult
the factory by calling 1-800-533-7533 for recommendations
regarding the use of higher flows with your specific application.
The outside air duct should be connected to the 6" round collar
on the filter enclosure of the unit. The 6" round collar includes a
manual damper. Adjust the manual damper to provide the desired
amount of fresh air for ventilation. The amount of fresh air should
be based on the size and occupancy of the residence. If you are
unsure of your ventilation air requirements, consult the factory by
calling 1-800-533-7533 for assistance.
Crawl Space Installation: Install a separate return for the Ultra-
Aire XT150H in a central area of the structure. Duct the supply of
the Ultra-Aire XT150H to a 10" x 10" x 10" tee/damper that is 20%
open to the crawl space if desired. Duct the other side of the tee
to the air supply of the existing HVAC system ventilation. Connect
an insulated duct from outside to the 6" collar of the Ultra-Aire
XT150H if you wish to provide optional fresh air.
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from outside to the 6" collar of the Ultra-Aire XT150H if you wish to
provide fresh air ventilation.
3.4E Installation in an Attic with an
Existing Forced Air HVAC System
ALWAYS install a catch pan with a drain and/or float interrupt
switch for condensate under the Ultra-Aire XT150H in an attic to
reduce liklihood of water damage.
3.5 Quiet Installation
Consider compression vibration and airflow noise during
installation. Use of flex duct and/or vibration isolation materials
during mounting and ducting will result in quieter operation.
Locate a separate return for the Ultra-Aire XT150H in a central
area of the structure. Duct the supply of the Ultra-Aire XT150H to
the air supply of the existing HVAC system. Connect an insulated
duct from outside to the 6" collar of the Ultra-Aire XT150H if you
wish to provide fresh air ventilation. Adjust damper in the collar
to provide the desired amount of fresh air. Using a remote control,
program the unit to bring in the desired amount of fresh air.
3.6 Noise Abatement
A length of flexible ducting on all Ultra-Aire XT150H duct
connections is recommended to reduce noise and vibration
transmitted to rigid ductwork in the structure.
4. 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
To determine how each control operates the Ultra-Aire XT150H,
it must first be determined which control is being used and
whether or not the Ultra-Aire XT150H is ducted for fresh air
ventilation. Refer to appropriate section.
3.4F Installation in a Structure with
Two Forced Air HVAC Systems
The Ultra-Aire XT150H can be installed into two typical HVAC
ducting systems. Install a separate return for the Ultra-Aire XT150H
as directed above. Discharge air from the dehumidifier should be
split and routed to each supply ducting system. A balancing damper
and a backdraft damper is required in each duct between the Ultra-
Aire XT150H and the HVAC ducting system. This allows airflow to
be adjusted and prevents flow of air between the ducting systems.
Contact the factory for assistance, if necessary.
Humidity/Fan Control Panel (P/N 4024155) (Figure 1, p.7)
4.1A
4.1B
4.1C
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
3.4G Installation in a Structure with No Existing
Forced Air HVAC System
When installing the Ultra-Aire XT150H in a structure that does not
have a forced air HVAC system, a single return for the Ultra-Aire
XT150H should be installed in central open area of the structure.
DO NOT locate the return in a bathroom or a kitchen. The supply of
the Ultra-Aire XT150H 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 Ultra-Aire XT150H to
be filtered and dehumidified. Avoid discharging all the air from the
dehumidifier in one location to prevent heat build up in that area. 4"
diameter duct is recommended for branches to the bedrooms, 6"
diameter duct is recommended for branches to larger areas. Refer
to section 3.4B for branch duct sizing. Connect an insulated duct
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Ventilation Timer/Humidity Control Panel (P/N 4024125)
(Figure 2, p.7)
4.2 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.
4.6D
Ventilation Timer and Humidity Control WITH Fresh Air
AND Motorized Damper
The dehumidifier will run continuously until
the relative humidity (RH) is reduced to the
humidity control dial setting. Setting the
humidity control to lower RH levels will NOT
DEH 3000 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
Figure 3:
Humidity Control
Adjustment Knob
increase the dehumidification rate; the unit
will simply run longer to reduce the RH to
the setting. The Ultra-Aire XT150H unit (and
4.1A 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 4.2.
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.
4.3 Fan/Filter Switch
4.1B Humidity/Fan Control Panel WITH Fresh Air
Ventilation and WITHOUT Damper
Turning ON the fan/filter switch will
cause the Ultra-Aire XT150H fan to run
continuously, whether the Ultra-Aire XT150H
is dehumidifying or not. This function is
desirable if the unit is used for air circulation
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 Ultra-
Aire XT150H is dehumidifying outside air will also be introduced.
For humidity control operation refer to section 4.2.
Figure 4
Fan/Filter Switch
and filtration to achieve maximum indoor air
quality. When the switch is ON; air will be
constantly filtered through the Ultra-Aire XT150H and 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.
4.1C 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 Ultra-Aire XT150H will then circulate and
dehumidify air to provide humidity control.
4.4 Ventilation Timer
The ventilation timer controls the fan and the motorized fresh
air damper. When the ventilation timer is activated, the Ultra-
Aire XT150H 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.
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 4.2 for
humidity control operation.
4.1D Ventilation Timer and Humidity Control WITH
Fresh Air AND Motorized Damper
Refer to sections 4.7 through 4.9C.
4.1E DEH 3000 Digital Control WITH Fresh Air AND
Damper
Refer to Section 5.
Humidity/Fan Control Panel
P/N 4024155
Ventilation Timer & Humidity
Control Panel • P/N 4024125
4.1F DEH 3000 Digital Control WITHOUT Fresh Air
Refer to Section 5.
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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
Ultra-Aire XT150H. 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.
4.4C 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 Ultra-Aire XT150H 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.
4.4A 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.
4.4B 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
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.
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ATTENTION INSTALLER
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
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.
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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.
5.2A Install Instructions
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.
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.
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.
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.
8. Test connections (see Section 2.6)
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Engage the A/C central fan during dehumidification
1. Disconnect the green wire that runs to the fan relay from the
screw on the thermostat.
2. Connect the green wire that runs to the fan relay to the COM
screw on the DEH3000 board.
3. Run a wire from the red wire screw on the thermostat to the NO
(Normally Open) screw on the DEH3000 board.
4. Run a wire from the green wire screw on the thermostat to the
NC (Normally Closed) screw on the DEH3000 board.
The central fan should run when the Thermostat fan switch
is turned to ON and when the dehumidifier is operating.
WARNING:
TO AVOID TRANSFORMER DAMAGE ONLY
CONNECT THE WHITE WIRE TO THE CONTROL IF A DAMPER IS
USED.
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 from the Ultra-
Aire dehumidifier.
2.4 Dehumidifier lockout/activation:
AC sensor feature
The control has the ability to activate the dehumidifier or
deactivate the dehumidifier when the air conditioner is running.
2.3 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:
Dehumidification
Operation
COM/NO
CLOSED
OPEN
COM/NC
OPEN
Standard wire colors for thermostats are as follows:
ON
Description
24VAC Return
Call for Heat
Force Fan On
Color
Red
Terminal code
OFF
CLOSED
R
White
Green
W or W1
G
Common uses (assuming standard thermostat wiring color
schemes as noted):
Compressor
Call for Cooling
Disengage A/C during dehumidification
Redirect the yellow thermostat wire to the NC terminal. Wire
Yellow
Y or Y1
the yellow wire from the A/C to the COM terminal.
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After connections have been verified, this short test will
confirm proper wiring.
1. Install front cover of control; insert at top first, then bottom.
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.
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.
a. Press RH until RH setpoint is 20%.
b. Verify Ultra-Aire fan and compressor operation.
c. Verify ventilation damper (if used) is closed.
5. Verify fan only operation by disengaging dehumidification and
operating fan:
a. Adjust RH setpoint above ambient conditions by pressing and
holding RH until set point is 80%.
b. Press fan button, then press again to toggle fan to “ON”
setting.
DEHUMIDIFIER ACTIVATES WHEN THE
AIR-CONDITIONER IS RUNNING
c. Release fan button, then press again to toggle fan to “ON”
setting until “FAN” flashes on display.
• The common wire on the thermostat transformer
(black) needs to be wired with the yellow wire from the
dehumidifier.
d. Verify fan operation of Ultra-Aire. No compressor operation
should be noted, and ventilation damper (if used) should be
closed.
• The Yellow wire from the thermostat must be wired to the
AC on sensor terminal.
6. Verify ventilation damper operation (if installed) by disengaging
from operation and engaging ventilating operation.
a. Press and hold fan button until “FAN” flashes on display.
b. Release “FAN” button, then press again to toggle fan
operation off.
c.Press and hold “VENT” button until“VENT” flasheson display.
d. Release “VENT” button, then press again until “OPEN” is
displayed.
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
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.
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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.
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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.
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.
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.
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.
O” indicator 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 “O” icon 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
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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 “O” will be displayed whenever
the unit is ventilating.The fan operation indicator “O” will also be
lit.
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.
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.
Example:
1. Press “PROGRAM ENTER” button. The following menu
appears:
When in the“program”mode, the control will operate the damper
and fan (ventilate) according to the programmed ventilation
schedule (See Section 3.8).
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
2. Using the up/down RH buttons, select “PROGRAM.” The
damper mode and return to “HOME.”
following menu appears:
5.3H Intermittent or Programmed Ventilation
You can select from:
“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 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.
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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:
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
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7.2 Technical Description
6. Maintenance
The Ultra-Aire XT150H 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 (See Figure 15).
6.1 Standard Air Filter
The Ultra-Aire XT150H is equipped with a pleated cloth air filter.
This filter should 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.
Hot, high-pressure refrigerant gas is routed from the compressor
to the condenser coil (See Figure 3). 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 filter/drier 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.
To access the air filter, remove the filter access panel from the end
of the Ultra-Aire XT150H. The filter should be readily visible and can
be removed by pulling them straight out of the Ultra-Aire XT150H.
The pleated cloth filter can generally be vacuumed clean several
times before needing replacement. Replacement filters can be
ordered from the factory or purchased locally if available. 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.
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 to repeat the
process.
6.2 High Efficiency Air Filter
An optional high efficiency pleated microglass paper filter is
available for the Ultra-Aire . This filter is rated as 90%-95% efficient
by the ASHRAE Dust Spot test method 52-76. The high efficiency
pleated microglass paper filter should be used in conjunction with
the standard filter, and placed directly beneath the standard filter.
This filter is able to remove allergy causing particles from the
airstream. The high efficiency filter has a much larger surface area
than the standard filter, thus the standard filter may need to be
cleaned or replaced several times before the high efficiency filter
requires replacement. Be careful not to damage the fabric media
when handling the high efficiency pleated paper filter. Do not
attempt to clean the high efficiency pleated paper filter. It should be
replaced when it becomes restrictive (See Figure 7).
6.3 Impeller Fan Oiling
The impeller fan motor is factory lubricated for many years of
normal operation, and no further oiling is required.
Figure 15: Refrigeration System of Ultra-Aire XT150H
6.4 Optional Fresh Air Return
Check and clean the screen on the outdoor fresh air return
seasonally. The screen may become plugged during the seasons
when there are many particles in the outdoor air.
7.3 Troubleshooting
No dehumidification, neither impeller 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
(Sec. 3.3 & 5.7A)
7. Service
7.1 Warranty
A warranty certificate has been enclosed with this unit; read
it before any repair is initiated. If a warranty repair is required,
call the factory first at 1-800-533-7533 for warranty claim
authorization and technical assistance.
3. Loose connection in internal or control wiring.
4. Defective Compressor relay.
5. Defective control transformer.
6. Low pressure Control open (Sec 3.7 & 5.10).
7. Optional Condensate Pump Safety Switch open (Sec 5.11).
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No dehumidification, compressor does not run but impeller fan
runs with fan switch and ventilation timer OFF and humidity
control turned to ON.
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.
1. Defective compressor run capacitor (Sec. 5.6).
2. Bad connection in compressor circuit
(See Fig. 4).
3. Unit has entered defrost cycle (Sec. 5.8).
4. Air filter dirty (Sec. 4.1 & 4.2).
3. Defective compressor overload (Sec. 5.6A).
4. Defective compressor (Sec. 5.6).
5. Defective defrost thermostat (Sec 5.8).
6. Low refrigerant charge (Sec. 5.4).
5. Defrost thermostat open (Sec. 5.8).
7. Air leak such as loose cover or ducting leaks.
8. Defective compressor (Sec. 5.6).
9. Restrictive ducting (Sec. 2.4).
Impeller fan runs with fan switch and ventilation timer OFF, but
compressor cycles on & off.
10.Optional Condensate Pump Safety Switch open (Sec 5.11).
1. Low ambient temperature and/or humidity causing unit to
cycle through defrost mode.
Unit Test to determine problem:
2. Defective compressor overload (Sec. 5.6A).
3. Defective compressor (Sec. 5.6).
4. Defrost thermostat defective (Sec. 5.8).
5. Dirty air filter(s) or airflow restricted.
1. Detach field control wiring connections from main unit.
2. Connect the yellow and green pigtails from the main unit
together; only the impeller fan should run. Disconnect the
wires.
6. Low refrigerant charge, causing defrost control to cycle.
7. Bad connection in compressor circuit.
3. Connect the yellow and blue pigtails from the main unit
together; the compressor and impeller 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!
Impeller fan does not run with fan switch in either position.
Impeller 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 impeller fan circuit (See Fig. 4).
2. Obstruction prevents impeller fan rotation.
3. Defective impeller fan.
4. Defective impeller fan relay.
5. Defective impeller fan capacitor.
6. Turn on the fan switch; the impeller fan should run. Turn off
the fan switch.
Impeller fan runs with fan switch ON. Impeller fan does not run
with ventilation timer activated.
7. Turn on the humidity control; the compressor and impeller fan
should run.
1. Defective ventilation timer.
8. If these tests work, the problem is most likely in the field
control wiring.
2. Time not correct on ventilation timer.
3. Ventilation timer set to manual & switched OFF.
4. Defective fan switch.
7.4 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.
Evaporator coil frosted continuously, low dehumidifying
capacity.
1. Defrost thermostat loose or defective (Sec. 5.8).
2. Low refrigerant charge
3. Dirty air filter(s) or airflow restricted.
4. Excessively restrictive ducting connected to unit.
7.5 Impeller Fan Replacement
The motorized impeller fan is a unitary assembly consisting of the
motor and impeller fan. If defective, the complete assembly must
be replaced.
Unit not providing ventilation. Ventilation timer not operating
correctly.
1. If timer is not functioning correctly reset timer and reprogram
(Sec. 3.5).
2. Check control wire connections (check
connections at fresh air damper also).
3. Defective fresh air damper (Sec. 5.9).
4. Defective fan switch.
1. Unplug the power cord.
2. Remove the cabinet access panel.
3. Remove the screw attaching the impeller fan support bracket
to the base.
4. Disconnect the impeller fan leads inside the electric box.
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5. Remove fan/bracket assembly by removing 3 screws from
the bracket and inlet ring assembly.
6. Remove the defective impeller fan from the bracket and
replace with it with the new impeller fan.
7. Reassemble the new impeller fan by reversing the above
procedure. Note: There are two pins on the backside of the
cabinet that must align with the two holes in the impeller fan
support bracket.
replace the run capacitor.
11. If the unit still does not start, adding a hard-start kit (relay &
capacitor) will provide greater starting torque. If this doesn't
work, the compressor has an internal mechanical defect and
must be replaced.
7.6B Replacing a Burned Out Compressor
The refrigerant and oil mixture in a compressor is chemically
very stable under normal operating conditions. However, when an
electrical short occurs in the compressor motor, the resulting high
temperature arc causes a portion of the refrigerant oil mixture to
break down into carbonaceous sludge, a very corrosive acid, and
water. These contaminants must be carefully removed otherwise
even small residues will attack replacement compressor motors
and cause failures.
7.6 Compressor/Capacitor Replacement
This compressor is equipped with a two terminal external overload
and a run capacitor, but no start capacitor or relay (See Figure 4).
7.6A Checking Compressor Motor Circuits
Perform the following tests if the impeller fan runs but the
compressor does not with the fan switch and ventilation timer OFF
and the humidity control ON.
The following procedure is effective only if the system is monitored
after replacing the compressor to insure that the clean up was
complete.
1. Unplug the unit; remove the cabinet side and the electrical
connection cover on the compressor top.
1. This procedure assumes that the previously listed compressor
motor circuit tests revealed a shorted or open winding.
2. Remove and properly dispose of the system charge. DO NOT
vent the refrigerant or allow it to contact your eyes or skin.
3. Remove the burned out compressor. Use rubber gloves if
there is any possibility of contacting the oil or sludge.
4. To facilitate subsequent steps, determine the type of burn
out that occurred. If the discharge line shows no evidence
of sludge and the suction line is also clean or perhaps has
some light carbon deposits, the burn out occurred while the
compressor was not rotating. Contaminants are therefore
largely confined to the compressor housing. A single
installation of liquid and suction line filter/driers will probably
clean up the system.
2. Plug in the unit and turn the humidity control to ON. Check for
110 volts from compressor terminal R to overload terminal
3 using an AC voltmeter. If voltage is present, go to step
3. If no voltage, there may be a loose connection in the
compressor circuit. Test each component for continuity. See
the appropriate section if a defect is suspected.
3. Unplug the unit, and then disconnect the red and yellow wires
from compressor terminals R & S. Using an ohmmeter check
continuity between the points listed below.
4. Compressor terminals C and S: No continuity indicates an
open start winding. The compressor must be replaced.
Normal start winding resistance is 3 to 7 ohms.
5. Compressor terminals C and R: No continuity indicates an
open run winding. The compressor must be replaced. Normal
run winding resistance is .5 to 2 ohms.
If sludge is evident in the discharge line, it will likely be found in the
suction line. This indicates the compressor burned out will running.
Sludge and acid have been pumped throughout the system. Several
changes of the liquid and suction filter/driers will probably be
necessary to cleanse the system.
6. Compressor terminal C and overload terminal 1: No continuity
indicates a defective overload lead.
7. Overload terminals 1 and 3: If there is no continuity, the
overload may be tripped. Wait 10 minutes and try again.
If there is still no continuity, it is defective and must be
replaced.
8. Compressor terminal C and compressor case: Continuity
indicates a grounded motor. The compressor must be
replaced.
5. Correct the system fault that caused the burn out. Consult the
factory for advice.
6. Install the replacement compressor with a new capacitor and
an oversized liquid line filter.
9. Disconnect the wires from the run capacitor. Set the
ohmmeter to the Rx1 scale. The capacitor is shorted and
must be replaced if continuity exists across its terminals.
If there is no needle movement with the meter set on the
Rx100000 scale, the capacitor is open and must be replaced.
10. Reconnect the wires to the compressor and capacitor. Plug
in and turn on the unit. If the compressor fails to start,
In a running burn out, install an oversized suction line filter/drier
between the accumulator and compressor. Thoroughly flush the
accumulator with refrigerant to remove all trapped sludge and to
prevent the oil hole from becoming plugged. A standing burn out
does not require a suction line filter/drier.
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7. Evacuate the system with a good vacuum pump and accurate
vacuum gauge. Leave the pump on the system for at least an
hour.
8. Operate the system for a short period of time, monitoring the
suction pressure to determine that the suction filter is not
becoming plugged. Replace the suction filter/drier if pressure
drop occurs. If a severe running burn out has occurred,
several filter/driers may have to be replaced to remove all of
the acid and moisture.
ventilation of the residence. The home should be ventilated with
fresh air as suggested by applicable codes and standards.
If the Ultra-Aire XT150H fails to ventilate as expected, check that
the time on the timer is correct. For the timer to carry out the
program schedule, the slide switch in the upper left corner on the
timer must be set to “AUTO”. The slide switch in the upper right
corner of the Ultra-Aire XT150H must be set to “RUN”. Also check
the programs on the timer to be sure that the timer is calling for
ventilation at the correct times. If the timer fails to operate or
operates erratically, reset the timer; see section 4.5 of this manual.
NOTE: NEVER use the compressor to evacuate the system or
any part of it.
7.8 Defrost Thermostat
The defrost thermostat is attached to the refrigerant suction tube
between the accumulator and the compressor. It will automatically
shut the compressor off if the low side refrigerant temperature
drops due to excessive frost formation on the evaporator coil. The
impeller fan will continue to run, causing air to flow through the
evaporator coil and melt the ice. When the ice has melted, the
evaporator temperature will rise and the thermostat will restart the
compressor.
7.6C Replacing a Compressor, Nonburn Out
Remove the refrigerant from the system. Replace the compressor
and liquid line filter/drier. Charge the system to 50 PSIG and check
for leaks. Remove the charge and weigh in the refrigerant quantity
listed on the nameplate. Operate the system to verify performance.
7.7 Remote Controls
The Ultra-Aire XT150H is controlled by devices mounted on a panel
that is remote from the unit. You may or may not have the devices
listed below depending on the model of the remote control panel
you purchased. If the Ultra-Aire XT150H fails to operate as desired,
always check the settings of the controls to insure that they are
correct. Check that the controls are receiving 24Vac from the
Ultra-Aire XT150H. Check the connections between the Ultra-Aire
XT150H, the control panel, and the field control wiring.
7.9 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.
7.7A Humidity Control
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 humidity control is an adjustable switch that closes when the
relative humidity of the air in which it is located rises to the dial set
point. It opens when the RH drops 4 to 6% below the set point. If
the Ultra-Aire XT150H does not run, try turning the humidity control
clockwise until it reaches the stop and the knob pointer points at
“Max Dry” (see back of control panel cover). If it still does not run,
remove the stop screw from the panel and turn the knob farther. If
it then runs, the humidity control is out of calibration or the RH is
below 40%.
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 1 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.
The Ultra-Aire XT150H is equipped with an automatic defrost
mechanism. If the Ultra-Aire XT150H operates in conditions that
develop frost on the evaporator, it will sense the frost build-up and
automatically defrost the evaporator. The Ultra-Aire XT150H may
not appear to be operating correctly during the defrost sequence,
but once the defrost sequence is completed, the Ultra-Aire XT150H
will resume dehumidifying.
2. Check for any obstruction inside the damper. If the electric
ventilation damper fails to operate after performing these
checks, it must be replaced.
7.10 Condensate Pump Kit
An optional condensate pump kit is available from the factory
for use with the Ultra-Aire XT150H. Condensate is automatically
pumped to a remote location when the water level in the pump's
reservoir rises to close the float switch.
7.7B Programmable Ventilation Timer
The ventilation timer controls the impeller fan and the motorized
fresh air damper. When the ventilation timer is activated, the
Ultra-Aire XT150H will circulate the indoor air, and bring in fresh air
from outside. The ventilation timer should be set for the required
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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 Ultra-Aire XT150H 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
Ultra-Aire XT150H will continue to ventilate or circulate air as
normal, but will not dehumidify until this switch closes.
Electric Schematics of the Ultra-Aire XT150H
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Pictorial Electrical Diagrams of Ultra-Aire XT150H
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SERVICE PARTS LIST: Ultra-Aire XT150H
Item Part No
Qty
1
1
2
1
Description
HEAT EXCHANGER
EVAPORATOR
CAPPILLARY TUBES .050" X .124" X 59.00"
COMPRESSOR - TOSHIBA,8.1
KBTU,115V,60HZ
ACCUMULATOR
FILTER/DRIER
TUBE - COND TO FILTER
TUBE - DISCHARGE LINE
CONDENSOR
Item Part No
Qty
1
1
1
1
1
1
1
4
Description
45mFd CAPACITOR - COMPRESSOR
TRANSFORMER
RELAY/COMPRESSOR
15mFd CAPACITOR - IMPELLER
COLLAR 10 INCH
COLLAR OVAL 10 INCH
COLLAR W/ DAMPER 6 INCH (NOT SHOWN)
LEVELING FOOT
DEFROST THERMOSTAT (NOT SHOWN)
DEFROST THERMOSTAT CLIP (NOT SHOWN)
WIRING DIAGRAM
1
2
3
4
4026477
4026672
4026934
4026670
12
13
14
15
16
17
18
19
20
4026687
4022487
4022484
4017021
4026932
4026947
4026933
4026221
4021470
4021648
4026660
5
6
7
8
9
4026655
4025087
4026674
4026472
4026673
4026657
4020924
1
1
1
1
1
1
1
1
1
1
10
11
IMPELLER
RELAY/BLOWER
21
2
The Ultra-Aire XT150H
1
2
7
18
not shown
4
5
6
17
7
19
9
8
10
11
12
13
14 15
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OPTIONAL PARTS LIST: Ultra-Aire XT150H
ITEM
26
27
28
29
30
31
32
33
34
35
36
37
PART NO.
4024375
4022220
4024155
4024125
4023660
4023672
4024153
4021495
4024150
4024122
4025560
4022486
4024369
4025287
QTY.
1
1
1
1
1
1
1
1
1
1
1
1
1
1
DESCRIPTION
Check Damper, 10" Diameter (not shown)
Condensate Pump Kit, External
Control Panel Assembly, Humidity/Fan
Control Panel Assembly, Ventilation Timer & Humidity
Controller, Humidity
Duct Damper, 6" Diameter, Electrically Actuated (not shown)
Cover for Items 28 & 29 (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
Merv 11 Standard Filter 20" x 16 "x 2"
Filter Box
not shown
not shown
Accessories
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DOOR AND COLLAR ASSEMBLY
Door Install
Insert tab on the bottom of the door,
in between the foam installation and
the metal side.
Push down on the plastic door latch
and swing door shit. Once the door is
shut release the door latch.
Collar Install
Remove the 2 round ducts, 3 seals and small bag
of mounting hardware from inside the rectangle
opening.
Adhere seals onto the back of each duct and
mount the ducts to the front of the dehumidifier
using screws provided.
Collars and hardware
are located here.
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ULTRA-AIRE XT150H Dehumidifier Limited Warranty
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.
WARRANTOR:
Therma-Stor LLC
PO Box 8680
Madison, WI 53708
Telephone: 1-800-533-7533
WHO IS COVERED: This warranty extends only to
the original residential end-user of the Ultra-Aire
XT150H dehumidifier, and may not be assigned or
transferred.
LIMITATIONS AND EXCLUSIONS: If any Ultra-
Aire XT150H Dehumidifier part is repaired or
replaced, the new part shall be warranted for
only the remainder of the original warranty period
applicable thereto (but all warranty periods will
be extended by the period of time, if any, that the
Ultra-Aire XT150H Dehumidifier is out of service
while awaiting covered warranty service).
FIRST YEAR WARRANTY: Therma-Stor LLC
warrants that,for one (1) year the Ultra-Aire XT150H
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.
UPONTHEEXPIRATIONOFTHEWRITTENWARRANTY
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
SHOULDTAKEPRECAUTIONSAGAINSTSAME),LOST
PROFITS, DELAY, OR LOSS OF USE OR DAMAGE TO
ANY REAL OR PERSONAL PROPERTY.
SECOND THROUGH FIFTH YEAR WARRANTY:
Therma-Stor LLC further warrants that for a period
of five (5) years, the condenser, evaporator, and
compressor of the Ultra-Aire XT150H 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), provided
that all labor and transportation charges for the
part(s) shall be borne by the end-user.
END-USER RESPONSIBILITIES: Warranty service
must be performed by a Servicer authorized by
Therma-Stor LLC. If the end-user is unable to locate
or obtain warranty service from an authorized
Servicer, he should call Therma-Stor LLC at the
above number and ask for the Therma-Stor LLC
Service Department, which will then arrange for
covered warranty service. Warranty service will be
performed during normal working hours.
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.
The End-user must present proof of purchase
(lease) upon request, by use of the warranty card
or other reasonable and reliable means. The end-
user is responsible for normal care. This warranty
only applies to residential applications and does
not cover any defect, malfunction, etc. resulting
LEGAL RIGHTS: This warranty gives you specific
legal rights, and you may also have other rights
which vary from state to state.
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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.
© 2007 Therma-Stor LLC. All rights reserved.
PO Box 8680 • Madison, WI 53708
Phone: 608-222-5301 • Fax: 608-222-1447
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