Ultra-Aire XT105H Installation instructions

TS-1159 10/19 Rev A
Serial Number
Install Date
Sold By
Installation & Operation Instructions
ULTRA AIRE XT105H / XT155H / XT205H
Ultra-Aire.com | 800.533.7533
The Ultra Aire XT Dehumidiers are ventilating
dehumidiers that integrate into the heating and
cooling system to provide the ultimate in comfort,
health and property protection through:
+ Dehumidication
+Fresh Air Ventilation (Optional)
+Air Filtration MADISON, WI

Safety Instructions ...................................................................... 3
Dehumidifier Set Up .................................................................... 4
Attaching Duct Collars................................................................. 5
Electrical Requirements .............................................................. 6
Drain Installation ......................................................................... 7
Ducting to HVAC Systems............................................................ 8
Recommended HVAC System Installation............................................ 9
Fresh Air Ventilation .................................................................. 10
Determine Ventilation Requirements ................................................... 11
Controls ..................................................................................... 12
Air Filtration............................................................................... 13
MERV Rating Chart ............................................................................. 14
Service....................................................................................... 15
Warranty .................................................................................... 17
TABLE OF CONTENTS
Ultra Aire is committed to manufacturing quality products. To maintain
our standards, product specications may change without notice.
4201 Lien Road, Madison, WI 53704
[phone]
www.Thermastor.com | www.Ultra-Aire.com
© 2019 Therma-Stor LLC

3
Ultra-Aire.com | [phone] Ultra Aire XT105H / XT155H / XT205H Installation Instructions
SAFETY INSTRUCTIONS
WARNING!
THIS SYMBOL MEANS IMPORTANT INSTRUCTIONS. FAILURE TO HEED THEM
CAN RESULT IN SERIOUS INJURY OR DEATH.
READ THE INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS CAREFULLY
BEFORE INSTALLING AND OPERATING THIS DEVICE. PROPER ADHERENCE TO THESE
INSTRUCTIONS IS ESSENTIAL TO OBTAIN MAXIMUM BENEFIT FROM YOUR ULTRA AIRE
VENTILATING DEHUMIDIFIER.
CAUTION!
THIS SYMBOL MEANS IMPORTANT INSTRUCTIONS. FAILURE TO HEED THEM
CAN RESULT IN INJURY OR MATERIAL PROPERTY DAMAGE.
Registrations
This Ultra Aire Dehumidier conforms to unied standard UL 60335-2-40 and CSA Standard C22.2 No. 92.
CAUTION!
READ ALL INSTRUCTIONS BEFORE BEGINNING INSTALLATION.
ALWAYS USE CAUTION AND WEAR CUT RESISTANT GLOVES WHEN HANDLING SHEET
METAL.
IMPROPER INSTALLATION MAY CAUSE PROPERTY DAMAGE OR INJURY.
INSTALLATION, SERVICE, AND MAINTENANCE MUST BE PERFORMED BY A QUALIFIED
SERVICE TECHNICIAN.
DEHUMIDIFIER IS HEAVY. HANDLE WITH CARE AND FOLLOW INSTALLATION INSTRUCTIONS.
NEVER OPERATE A UNIT WITH A DAMAGED POWER CORD. IF THE POWER CORD IS
DAMAGED, IT MUST BE REPLACED BY THE MANUFACTURER, ITS SERVICE AGENT, OR A
SIMILARLY QUALIFIED PERSON IN ORDER TO AVOID A HAZARD.
THIS APPLIANCE IS NOT INTENDED FOR USE BY PERSONS (INCLUDING CHILDREN) WITH
REDUCED PHYSICAL, SENSORY OR MENTAL CAPABILITIES, OR LACK OF EXPERIENCE
OR KNOWLEDGE, UNLESS THEY HAVE BEEN GIVEN SUPERVISION OR INSTRUCTION
CONCERNING THE USE OF THE APPLIANCE BY A PERSON RESPONSIBLE FOR THEIR
SAFETY. CHILDREN SHOULD BE SUPERVISED TO ENSURE THAT THEY DO NOT PLAY WITH
THE APPLIANCE.
WARNING!
120 VOLTS MAY CAUSE SERIOUS INJURY FROM ELECTRIC SHOCK.
DISCONNECT ELECTRICAL POWER BEFORE STARTING INSTALLATION OR
SERVICING, AND LEAVE POWER DISCONNECTED UNTIL INSTALLATION OR
SERVICE IS COMPLETED.

4Ultra Aire XT105H / XT155H / XT205H Installation Instructions Ultra-Aire.com | [phone]
Removal of Compressor Shipping Support
The Ultra Aire Dehumidier uses a compressor to power the refrigeration
system. To protect the compressor and refrigeration system during
shipping, a plastic tie wrap secures it to the unit’s frame. Remove the tie
wrap by cutting the tie wrap and pulling from the unit as shown. After
removing tie wrap, insert plastic plugs provided into the holes.
CAUTION!
REMOVE COMPRESSOR SHIPPING TIE FROM THE UNIT. FAILURE TO REMOVE SHIPPING TIE
WILL CAUSE EXCESS VIBRATION TO BE TRANSMITTED TO THE FRAME.
Important Precautions
• The device is designed to be installed indoors in a space that is protected from rain and ooding.
• Install the unit with enough space to access one of the side panels for maintenance and service.
• Avoid directing the discharge air at people.
• If used near a water source, be certain there is no chance the unit could fall into the water or get splashed and
that it is plugged into a dedicated circuit and Ground Fault Circuit Interrupter (GFCI) protected outlet.
• DO NOT use the dehumidier as a bench or table.
• DO NOT place the dehumidier directly on structural building members without vibration absorbers or unwanted
noise may result. Place the Ultra Aire Dehumidier on supports to raise the base of the unit.
• A drain pan with a oat switch MUST be placed under the dehumidier if installed above a living area or above
an area where water leakage could cause damage.
Location Considerations
• Allow sucient clearance to handle the unit’s overall dimensions as well as the necessary return and supply
ductwork to the unit.
• Allow sucient clearance for lter removal and to prevent airow obstruction.
• Electrical service access will require the removal of a side panel. Allow sucient clearance on a side of the unit.
• Locate the dehumidier in an area where the cord’s length (9') easily reaches a 115 VAC electrical outlet with a
minimum of a 15 Amp circuit capacity. The Ultra Aire XT205H requires a dedicated 20 Amp circuit.
• Locate the dehumidier in an area where eld
wiring the control (low voltage) to the unit will
be possible.
• It is recommended that a backdraft damper
be used in the discharge duct of the Ultra
Aire Dehumidier, especially when connecting
to the supply ducting system. The backdraft
damper prevents supply air from counter
owing through the Ultra Aire Dehumidier
when it is not operating. The dehumidier’s
location should be chosen to allow installation
of this accessory if necessary.
• The Ultra Aire Dehumidier may be
suspended from structural members with
steel hanger straps or a suitable alternative,
ensuring the assembly supports the
dehumidier’s base in its entirety. DO
NOT hang the Ultra Aire Dehumidier
from its cabinet.
• Allow for proper routing and drainage of
needed drain pipes.
Electrical Service Access
(Either Side)
Filter 9' Power Cord
Top View
Minimum
Clearance
For Filter
(Either Side)
15"
6" Fresh Air Intake (Optional)
10" Return Air Duct
10" Supply Air Duct
A
B
C
32 3/8"
With Collars Installed
26"
Without Collars Installed
B
C
Drain Port
A
Top View
41 1/2"
With Collars Installed
37 3/4"
Without Collars Installed
Drain Port 9' Power CordFilter
Minimum
Clearance
For Filter
(Either Side)
20"
6" Fresh Air Intake (Optional)
10" Return Air Duct
A
B
6” Fresh Air
Intake (Optional)
10” Return Air Duct
Electrical Service Access
(Either Side)
A
B
The 10” Supply Air Duct (not pictured) is
below the Fresh Air Intake and the Return
Air Duct. The same amount of clearance
is needed for the 10” Supply Air Duct.
6" Minimum Clearance
For Proper Airflow
DEHUMIDIFIER SET UP

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ATTACHING DUCT COLLARS
Duct Collar Installation
Remove the two round ducts, oval duct, and oval duct seal and small bag of mounting hardware from inside
the rectangle opening.
Fresh Air Ventilation Duct
Fresh air ventilation is optional. Attach 6" diameter duct to the unit using the screws provided. The 6" duct
should be capped if fresh air is not desired. If setting up the unit to provide fresh air ventilation, see page 10.
Return Air Inlet
Attach 10" diameter duct collar to the unit with the screws provided.
Supply Air Outlet
Adhere seal onto the back of the oval duct and mount the duct to the front of the dehumidier using the screws
provided.
SIDE VIEW
FRONT VIEW
6" Fresh Air Inlet (Optional)
10" Return Air Inlet
10" Supply Air Outlet
A
B
C
A
B
C
Collars and
hardware are
located here.

6Ultra Aire XT105H / XT155H / XT205H Installation Instructions Ultra-Aire.com | [phone]
The Ultra Aire Dehumidier plugs into a common grounded 115 VAC outlet. Locate the dehumidier in an
area where the cord’s length (9') easily reaches a 115 VAC electrical outlet with a minimum of 15 Amp circuit
capacity. The Ultra Aire XT205H requires a dedicated 20 Amp circuit. If used in an area that may become wet,
a GFCI protected circuit is recommended. Consult local electrical codes for further information.
Ultra Aire oers a variety of control devices for use with the Ultra Aire Dehumidier. The control is to be
located remotely from the dehumidier and placed in the space to be conditioned. A low voltage (24 Volt)
control MUST be used with the Ultra Aire Dehumidier and MUST be connected with low voltage (18-22
gauge) thermostat wire.
ELECTRICAL REQUIREMENTS
CAUTION!
DO NOT ALLOW THE WIRE FROM THE 24V TERMINAL TO MAKE CONTACT WITH THE WIRE FROM
THE COM TERMINAL OR DAMAGE TO THE TRANSFORMER WILL RESULT.
Electrical Precautions
• Do not install the control where it may not accurately sense the
relative humidity such as near HVAC supply registers, near
exterior doors, on an outside wall, near a window, or near a
water source.
• The screw terminals on the Ultra Aire Dehumidier and the
control are labeled to prevent confusion.
• Be sure to consult the electrical schematic in the CONTROLS
Section (page 12) of this manual or inside the access panel
of the Ultra Aire Dehumidier before making control
connections.
WARNING!
THE REMOTE CONTROLS OF THE ULTRA AIRE DEHUMIDIFIER ARE POWERED BY A LOW VOLTAGE
CIRCUIT (24 VAC) AND MUST NEVER CONTACT OR BE CONNECTED TO A HIGH VOLTAGE CIRCUIT.
CAUTION!
SOME OF THE TERMINAL CONTROLS ON THE ULTRA AIRE DEHUMIDIFIER MAY BE USED WITH
CERTAIN CONTROLS.
Wiring Diagram

7
Ultra-Aire.com | [phone] Ultra Aire XT105H / XT155H / XT205H Installation Instructions
The Ultra Aire Dehumidier generates condensate.
Place a secondary drain pan with a oat switch under the dehumidier if it is suspended above a nished
area or above an area where water leakage could cause damage.
A drain trap is required for the dehumidier to drain properly. Install a 3/4" threaded male NPT adapter to the
drain pan. Install a drain pipe assembly utilizing 3/4" PVC pipe to transport the condensate to a drain. Pitch
of drain should be 1" per 10'.
An optional condensate pump kit is available for use with the Ultra Aire Dehumidier and may be installed if
lift is required to dispose of condensate. Condensate is automatically pumped to a remote location when the
water level in the pump’s reservoir rises to close the oat switch.
The pump also contains a safety oat switch. The white leads from this switch extend from beneath the
pump cover. This switch should be installed in series with the eld wire that connects to the common lead
from the Ultra Aire Dehumidier to the control panel. If the pump fails, this switch opens the common control
circuit and stops water production before the reservoir overows. Contact a qualied electrician to install the
safety oat switch to the Ultra Aire Dehumidier.
Note: An optional condensate pump kit and an automatic cut-o device can be purchased through your
dealer or online.
DRAIN INSTALLATION
Drain Installation
Drain
Trap
Drain
Port
4035934
Drain Trap
Drain Port
Secondary Drain Pan
Drain
Trap
Drain
Port
4035934
Drain Trap
Drain Port
Secondary Drain Pan

8Ultra Aire XT105H / XT155H / XT205H Installation Instructions Ultra-Aire.com | [phone]
The recommended installation creates a separate return for the Ultra Aire Dehumidier in a central area
of the structure. Duct the supply of the unit to the air supply of the existing HVAC system. Connect an
insulated duct from outside to the 6" collar of the Ultra Aire Dehumidier to provide fresh make-up air.
Adjust the damper in the duct to provide the desired amount of fresh air.
DUCTING TO HVAC SYSTEMS
CAUTION!
DO NOT CONNECT WITH A STATIC PRESSURE GREATER THAN OR EQUAL TO +0.5 WG.
CONTACT TECHNICAL SUPPORT AT [phone] FOR ADDITIONAL DETAILS.
Ducting Considerations:
• All exible ducting connected to the Ultra Aire Dehumidier should be UL listed.
• A short piece of exible ducting on all Ultra Aire Dehumidier duct connections is recommended to
reduce noise and vibration transmitted to rigid ductwork in the structure.
• Use a minimum 10" diameter round or equivalent rectangular duct for total duct lengths of up to 25'.
Use a minimum 12" diameter round or equivalent rectangular duct for longer lengths.
• Grills or diusers on the duct ends must not excessively restrict airow.
• Eective dehumidication may require that ducting be branched to isolated, stagnant air ow areas. When
ducting to two or three areas, use 8" or larger diameter branch ducting. When ducting to four or more
areas, use 6" or larger diameter branch ducting. Provisions must be made to provide airow from supply
locations to the central return location. Proper air distribution is important to ensure even humidity control
and heat distribution throughout the structure.
• DO NOT locate the return in a bathroom or a kitchen.

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Air Handler
HVAC Supply
Dedicated Ultra-Aire 90 Return to A/C Supply
HVAC Return
Fresh Air Intake
(Optional)
Motorized
Damper
Indoor
Air Return Ultra Aire
Supply
Backdraft
Damper
Recommended HVAC System Installation
DUCTING TO HVAC SYSTEMS
The recommended installation draws air from a dedicated indoor air return and ducts the supply of the
dehumidier to the air supply of the existing HVAC system. Utilize the optional fresh air ventilation duct to
provide outside air.
• Install a dedicated air return for the Ultra Aire Dehumidier from a central area of the structure.
• Install an insulated duct from outside to the 6" collar of the Ultra Aire Dehumidier to provide fresh air
ventilation (optional).
• Duct the supply of the Ultra Aire Dehumidier to the supply of the existing HVAC system with a
backdraft damper.
• DO NOT locate return in a bathroom or kitchen.
• Control should be located remotely from the dehumidier and placed in a central location.
Please visit our website at www.ultra-aire.com/install-options/ for more installation options.
Dedicated Ultra Aire Return to HVAC Supply

10 Ultra Aire XT105H / XT155H / XT205H Installation Instructions Ultra-Aire.com | [phone]
Fresh air ventilation is optional.
Fresh air may be brought into the structure by connecting an insulated duct from outside the structure to
the 6" inlet of the Ultra Aire Dehumidier. A ventilation control is needed to program the time and frequency
that the unit introduces outside air. The time and frequency of ventilation should be based on the size and
occupancy of the residence.
• The fresh air ventilation duct should be connected to the 6" round collar on the front of the Ultra Aire De-
humidier.
• An insulated 6" diameter duct on the XT155H and XT205H provides up to 100 CFM of outside air.
• An insulated 6” diameter duct on the XT105H provides up to 75 CFM of outside air.
• If a motorized damper is not being used, fresh air is controlled by the manual damper in the 6" collar
of the Ultra Aire Dehumidier.
• Performance of the Ultra Aire Dehumidier can be impacted by inside and outside air conditions.
• When a 6" motorized damper is used, a digital control is required.
• It may be necessary to use 8" duct work if additional fresh air is required.
• In cold climates or at times when the dew point is low, ventilation can be used to dehumidify the
structure, making the Ultra Aire Dehumidier capable of year-round drying.
FRESH AIR VENTILATION
OUTLET DUCT
COLLAR WITH
BACK DRAFT
DAMPER
RETURN AIR
INLET DUCT
COLLAR
FRESH AIR
INLET DUCT
COLLAR
RETURN AIR
INLET DUCT
COLLAR
FRESH AIR
INLET DUCT
COLLAR
AIR FLOW
Air
Flow
Hot Climate
6" Fresh Air Inlet
(Optional)
10" Return Air Inlet
10" Supply Air Outlet
A
B
C
Outdoor Air
30°F, 65%RH
Indoor Air
70°F, 50%RH
Outlet Air
59°F, 51%RH
Cold Climate
A
B
C
6" Fresh Air Inlet
(Optional)
10" Return Air Inlet
10" Supply Air Outlet
A
B
C
Mixed Air
59°F
51%RH
Mixed Air
59°F
51%RH
Outdoor Air
90°F, 65%RH
A
Indoor Air
70°F, 50%RH
B
Outlet Air
75°F, 65%RH
C
Mixed Air
75°F
65%RH
Mixed Air
75°F
65%RH
Outdoor Air
30°F, 65%RH
A
Indoor Air
70°F, 50%RH
B
Outlet Air
59°F, 51%RH
C
Mixed Air
59°F
51%RH
Mixed Air
59°F
51%RH
Fresh Air Ventilation With Dehumidier O and Fan Only Operation
Outside air mixes with the dehumidier’s return air before being supplied to the home. Outside
temperature, inside temperature and relative humidity will impact the combined outlet air conditions.
Note: Temperature and relative humidity may vary depending on duct distribution scheme.

11
Ultra-Aire.com | [phone] Ultra Aire XT105H / XT155H / XT205H Installation Instructions
Option 1: Calculating Airflow Requirement Using ASHRAE 62.2-2016 Airflow Equation
ASHRAE Airow in CFM = [House Area in Sq.Ft. x 0.03] + [(Number of Bedrooms +1) x 7.5]
NOTE: Use ‘Number of Bedrooms + 1’ or ‘Number of Occupants’, whichever is larger.
Example 1: Number of Bedrooms + 1
2500 square foot house with 3 bedrooms, 4 occupants = [2500 X 0.03] + [(3+1) X 7.5] = 105 CFM
Example 2: Number of Occupants
2500 square foot house with 3 bedrooms, 5 occupants = [2500 X 0.03] + [5 X 7.5] = 112.5 CFM
Record the required CFM ____________
FRESH AIR VENTILATION
Determine Ventilation Requirements
The MINIMUM ventilation requirement is calculated using ASHRAE 62.2-2016. Use one or both of the options
below to determine your ventilation requirement. Follow all local and national building and safety codes.
Option 2: Calculating Airflow Requirement Using Table 4.1 from ASHRAE 62.2-2016
Record the required CFM ____________
Floor Area
(ft2)
< 500
501 - 1000
1001 - 1500
1501 - 2000
2001 - 2500
2501 - 3000
1
30
45
60
75
90
105
2
38
53
68
83
98
113
3
45
60
75
90
105
120
4
53
68
83
98
113
128
5
60
75
90
105
120
135
Number of Bedrooms
Ventilation Air Requirements, CFM
Table 4.1 from ASHRAE 62.2-2016

12 Ultra Aire XT105H / XT155H / XT205H Installation Instructions Ultra-Aire.com | [phone]
CONTROLS
A control must be used with the Ultra Aire Dehumidier. Ultra Aire oers the DEH 3000 proprietary control. The
DEH 3000 allows homeowners to monitor and control relative humidity and proper ventilation levels in their home.
This control is also available with a remote sensing option.
Note: The DEH 3000 is sold seperately and can be purchased online or through your local dealer. Other
thermostats are compatible with the Ultra Aire Dehumidier.
CAUTION!
DO NOT ALLOW THE 24V TERMINAL FROM THE ULTRA AIRE DEHUMIDIFIER TO CONTACT THE COM
TERMINAL ON THE ULTRA AIRE DEHUMIDIFIER OR DAMAGE TO THE TRANSFORMER WILL RESULT.
Wiring Controls
Circuit Breaker
To prevent damage to the 24 volt control transformer, the Ultra Aire Dehumidier comes
with a resettable circuit breaker. Check wiring for any electrical short and repair before
resetting breaker. Resetting the circuit breaker without correcting the electrical short may
result in transformer damage. Be sure to check the electrical schematic in this manual
or inside the access panel of the Ultra Aire Dehumidier before making any control
connections. The reset button for the circuit breaker can be found on the back
of the unit.
Control Connections
The control and the Ultra Aire Dehumidier are labeled to prevent confusion. Depending
on the control, some of the screw terminals on the Ultra Aire Dehumidier may not be
used. Be sure to consult the electrical schematic in this manual or inside the access panel
of the Ultra Aire Dehumidier before making control connections.
FRONT VIEW
20 1/4”
21 3/4”
21 3/4”
41 1/2”
37 3/4”
21 3/4” 21 3/4”
BACK VIEW
20 1/4”
SIDE VIEW
Rear View
Circuit Breaker
Reset Button
A low voltage control must be used with the Ultra Aire Dehumidier.
COM 24VAC Power Transformer Neutral Side
FAN Fan Control
24V Transformer High Side
DEHU Dehumidication (Fan and Compressor) Control
FLOAT External low voltage oat switch or water sensor (two terminals)
Use normally closed switch
Terminal Block Control Operation:
Compressor ON / Fan ON Make contact between 24V and DEHU terminals
Compressor OFF / Fan ON Make contact between 24V and FAN terminals
Power HVAC Accessory Connect the accessory to the COM and 24V terminals
Between the COM lead and the 24V TERMINAL is a 40VA transformer. This low voltage power source
powers the relay coils which control the fan and compressors. This 24VAC transformer can also be
used to power HVAC accessories external to the dehumidier.
NOTE: 18 gauge wire needed between the Ultra Aire Dehumidier and the external control.

13
Ultra-Aire.com | [phone] Ultra Aire XT105H / XT155H / XT205H Installation Instructions
This Ultra Aire Dehumidier is equipped with a MERV-13 lter. The lter should be checked and replaced every
three to six months. Operating the unit with a dirty lter will reduce dehumidier capacity and eciency.
DO NOT operate the unit without the recommended lter. Filter non-compliance voids the product warranty.
AIR FILTRATION
Changing the Filter
For greatest ltration and eciency of the Ultra Aire Dehumidier, it is recommended the air lter be
replaced every three to six months with a MERV-13 lter.
CAUTION!
MAKE SURE UNIT IS OFF BEFORE CHANGING THE FILTER.
Step 1: The lter door is attached to the cabinet by three hinges. Release the latch from the cabinet
by pulling it towards the front of the unit. The lter door will swing open to gain access to the lter.
Step 2: Remove the lter by gently pulling it straight out of the unit. Insert new lter by gently
pushing it straight into the unit. Make sure the AIR FLOW arrow on the lter is pointing into the unit.
Side View
Filter Door
Fresh Air Intake
(Optional)
Return
Slide Latch
Side View
Filter
Return
Filter
Supply
Return
Filter
Supply
To Remove,
pull out straight.
Side View
Filter Door
Fresh Air Intake
(Optional)
Return
Slide Latch
Filter Door Closed
Latch
Side View
Fresh Air Intake
(Optional) and
Return Air Duct
Supply Air Duct
Return
Filter
Supply
Return
Filter
Supply
To Replace,
push in straight.
Front View Front View
Filter
Door
Open
Step 3: Close the lter door by swinging it shut and reattaching the latch.
Filter
Door
Open
Side View
Filter Door
Fresh Air Intake
(Optional)
Return
Slide Latch
Filter
Door
Closed
Side View

14 Ultra Aire XT105H / XT155H / XT205H Installation Instructions Ultra-Aire.com | [phone]
AIR FILTRATION
Standard 52.5 Minimum
Efficiency Reporting
Value
Dust Spot
Efficiency Arrestance
Typical Controlled
Contaminant
Typical Applications and
Limitations Typical Air Filter/Cleaner Ty pe
20 n/a n/a < 0.30 pm Particle Size Cleanrooms
>99.999% eff. On .10-.20 pm
Particles
19 n/a n/a Virus (unattached) Radioactive Materials
p
Particles
18 n/a n/a Carbon DustPharmaceutical Man.
p
Particulates
17 n/a n/a All Combustion Smoke Carcinogenetic Materials >99.97% eff. On .30 pm Particles
16 n/a n/a .30-1.0 pm Particle Size General Surgery Bag Filter - Nonsupported
15 >95% n/a All Bacteria Hospital Inpatient Care microfine fiberglass or
14 90-95% >98% Most Tobacco Smoke Smoking Lounges
synthetic media, 12-36 in. deep,
6-12 pockets.
13 89-90% >98% Proplet Nuceli (Sneeze) Superior Commercial Buildings
Box Filter - Rigid Style Cartridge
Filters 6 to 12" deep may use
lofted or paper media.
12 70-75% >95% 1.0-3.0 pm Particle Size Superior Residential Bag Filter - Nonsupported
Legionella microfine fiberglass or
1160-65% >95% Humidifier Dust Better Commercial Buildings
synthetic media, 12-36 in. deep,
6-12 pockets.
Lead Dust
10 50-55% >95% Milled Flour
Box Filter - Rigid Style Cartridge
Filters 6 to 12" deep may use
lofted or paper media.
Auto Emissions Hospital Laboratories
940-45% >90% Welding Fumes
830-35% >90% 3.0-10.0 pm Particle Size Commercial Buildings
Pleated Filters-Disposable,
extended surface area, thick with
Mold Spores
cotton-polyester blend media,
cardboard frame.
725-30% >90% Hair Spray Better Residential
Fabric Protector
Cartridge Filters - Graded density
viscous coated cube or pocket
filters, synthetic media.
6<20% 85-90% Dusting Aids Industrial Workplace
Cement Dust
Throwaway - Disposable
synthetic panel filter.
5<20% 80-85% Pudding Mix Paint Booth Inlet
4<20% 75-80% >10.0 pm Particle SizeMinimal Filtration
Throwaway - Disposable
fiberglass or synthetic panel filter.
Pollen
3<20% 70-75% Dust Mites Residential Washable - Aluminum Mesh.
Sanding Dust
2<20% 65-70% Spray Paint Dust
Textile Fibers Window A/C Units
Electrostatic - Self charging
woven panel filter.
1<20% <65% Carpet Fibers
MERV Rating Chart
Table Data Source: United States Environmental Protection Agency

15
Ultra-Aire.com | [phone] Ultra Aire XT105H / XT155H / XT205H Installation Instructions
SERVICE
Symptom Possible Reason Troubleshooting Procedure
CAUTION!
TROUBLESHOOTING SHOULD BE PERFORMED BY A QUALIFIED HVAC TECHNICIAN.
Troubleshooting
Troubleshooting Procedure for Control
Related Issues
This method of diagnosis will test the 3 main
components of the control circuit individually to
indicate any potential problems. This is to be used
when the control will not activate the main unit.
1. Detach eld control wiring connections from
the pigtails on the main unit.
2. Jumper a wire from the 24V terminal to the
FAN terminal; only the fan should run.
Disconnect when complete.
3. Jumper the 24V terminal to the DEHU
terminal; the fan and compressor should run.
Disconnect when complete.
4. If this test works, the main unit is working
correctly from a control standpoint.
5. Reconnect eld control wiring to the Terminal
block on the main unit.
6. Remove the control panel cover and detach
the eld wiring from the control connections.
7. Connect the 24V terminal and the FAN
terminal wires together; the fan only should
run. Disconnect when complete.
8. Jumper a wire from the 24V and DEHU
terminal; fan and compressor should run.
Disconnect when complete.
9. If this test works, then the eld control wiring
is ok.
10. If the problem persists, then the control is
most likely faulty.
WARNING!
ELECTRICAL SHOCK HAZARD:
ELECTRICAL POWER MUST BE PRESENT
TO PERFORM SOME TESTS. THESE TESTS
SHOULD BE PERFORMED BY A QUALIFIED
SERVICE PERSON.
Neither fan nor
compressor
running.
Dehumidication
is being called for.
Compressor is
not running.
Dehumidication
is being called for.
Fan is running.
1. Defective compressor
run capacitor.
2. Loose connection in
compressor circuit.
3. Defective compressor
overload.
4. Defective compressor.
5. Defrost thermostat open.
Compressor
cycles on and o.
Dehumidication is
being called for.
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 lter(s) or air
ow restricted.
6. Defective fan or relay.
1. Dehumidier unplugged
or no power to outlet.
2. Humidity control set
too high.
3. Loose connection in
internal or control wiring.
4. Defective compressor
relay.
5. Defective control
transformer.
6. Open circuit between
FLOAT terminals.

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Troubleshooting (Continued)
SERVICE
Symptom Possible Reason Troubleshooting Procedure
Troubleshooting Procedure for Performance
Related Issues
This method of diagnosis is used to function
check the internal components in the dehumidier.
This is to be used when a performance issue is
suspected.
1. Set the humidity controller all the way to the
most humid setting or o position – Did the
unit shut o?
2. If yes, turn the fan setting to the ON position –
does the fan start?
3. If fan starts, leave in the fan ON position and
set the humidity all the way to driest setting.
May have to wait 5 minutes for the compressor
to start.
4. Listen for a distinct buzzing/humming sound
of a compressor starting up – do you hear this
noise?
5. If compressor is running and continues to run,
after about 15 minutes you should feel a slight
increase in air temperature being discharged
out of the discharge air side of the unit.
6. If so, depending on your environmental
conditions (temp/Rh%), you should see some
water production out of the hose within
30 minutes or so. (Note: If the room
temperature is 55 degrees or below and/or
in area of low relative humidity, the
dehumidier will produce little to no water.)
7. Collecting the water removed in a 24 hour period
will give a measurement of performance.
WARNING!
ELECTRICAL SHOCK HAZARD:
ELECTRICAL POWER MUST BE PRESENT
TO PERFORM SOME TESTS. THESE TESTS
SHOULD BE PERFORMED BY A QUALIFIED
SERVICE PERSON.
Fan is not running.
Dehumidication
or fan is being
called for.
1. Loose connection in
fan circuit.
2. Obstruction prevents
fan impeller rotation.
3. Defective fan.
4. Defective fan relay.
Low dehumidication
capacity (evaporator
is frosted
continuously).
Dehumidication is
being called for.
1. Defrost thermostat loose
or defective.
2. Low refrigerant charge.
3. Dirty air lter(s) or air ow
restricted.
4. Excessively restrictive
ducting connected to unit.
No ventilation.
Ventilation is being
called for.
1. Loose connection in
ventilation control circuit.
2. Loose connection in
damper power circuit.
3. Defective fresh air
damper.
Dehumidier
removes some
water, but not as
much as expected.
1. Air temperature and/or
humidity have dropped.
2. Humidity meter and/or
thermometer used are
out of calibration.
3. Unit has entered defrost
cycle.
4. Dirty air lter(s) or air ow
is restricted.
5. Defective defrost
thermostat.
6. Low refrigerant charge.
7. Air leak such as loose
cover or ducting leaks.
8. Defective compressor.
9. Restrictive ducting.
WARNING!
SERVICING THE ULTRA AIRE DEHUMIDIFIER 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. SERVICE MUST
BE PERFORMED BY A QUALIFIED SERVICE TECHNICIAN.
If the refrigerant charge is lost due to service or a leak, the leak should be repaired and 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.
Refrigerant Charging

17
Ultra-Aire.com | [phone] Ultra Aire XT105H / XT155H / XT205H Installation Instructions
WARRANTY
Limited Warranty. Therma-Stor, LLC (“Therma-Stor”) warrants as follows: (i) the Ultra Aire Dehumidifier dehumidifier
(“Product”) will be free of material defects in workmanship or materials for a period of two (2) years (“Two-Year Warranty”)
following the date of initial purchase of such Product by an original customer purchasing from Therma-Stor or an authorized
reseller (“Customer”); and (ii) the Product’s components will be free of material defects in workmanship or materials for a period
of six (6) years following the date of initial purchase of such Product by a Customer.
Limitation of Remedies. CUSTOMER’S SOLE AND EXCLUSIVE REMEDY UNDER THE ABOVE LIMITED WARRANTY AND
THERMA- STOR’S ENTIRE LIABILITY THEREUNDER, SHALL BE, AT THE SOLE OPTION OF THERMA-STOR, REPLACEMENT
OR REPAIR OF SUCH PRODUCT OR ITS COMPONENTS (“COMPONENTS”) BY THERMA-STOR OR THERMA-STOR’S
AGENTS ONLY. REFRIGERANT, PIPING, SUPPLIES, TRANSPORTATION COSTS, LABOR COSTS INCURRED IN REPAIR OR
REPLACEMENT OF SUCH COMPONENTS ARE NOT INCLUDED. THIS DISCLAIMER AND EXCLUSION SHALL APPLY EVEN
IF THE EXPRESS WARRANTY AND LIMITED REMEDY SET FORTH HEREIN FAILS OF ITS ESSENTIAL PURPOSE. CUSTOMER
ACKNOWLEDGES THAT NO REPRESENTATIVE OF THERMA-STOR OR OF ITS AFFILIATES OR RESELLERS IS AUTHORIZED
TO MAKE ANY REPRESENTATION OR WARRANTY ON BEHALF OF THERMA-STOR OR ANY OF ITS AFFILIATES OR
RESELLERS THAT IS NOT IN THIS AGREEMENT. Notwithstanding the above, during the term of the Two-Year Warranty only,
Therma-Stor will provide, free of charge to Customer, all Components and labor (except costs related to removal and installation
of Product) required to fulfill its obligations under such Two-Year Warranty.
Disclaimer of Warranties. EXCEPT FOR ABOVE LIMITED WARRANTY, WHICH IS THE SOLE AND EXCLUSIVE
WARRANTY PROVIDED WITH RESPECT TO THE PRODUCT AND ITS COMPONENTS, THERMA-STOR HEREBY DISCLAIMS
ALL EXPRESS AND IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
Warranty Limitations. The foregoing limited warranty extends only to a Customer and shall be null and void upon attempted
assignment or transfer. A “defect” under the terms of the limited warranty shall not include problems resulting from Customer’s
or Customer’s employees’, agents’, invitees’ or a third party’s misuse, improper installation, improper design of any system
in which the Product is included, abuse, lack of normal care, failure to follow written instructions, tampering, improper repair,
or freezing, corrosion, acts of nature or other causes not arising out of defects in Therma-Stor’s workmanship or material. If a
Product or Component is replaced while under warranty, the applicable limited warranty period shall not be extended beyond
the original warranty time period. The limited warranty does not cover any costs related to changes to a Product or Component
that may be required by any codes, laws, or regulations that may become effective after initial purchase of the Product by
Customer.
Customer Responsibilities. As a further condition to obtaining warranty coverage hereunder, the Customer must send a valid
warranty claim to Therma-Stor such that Therma-Stor receives such claim prior to the end of the applicable warranty period.
Therma-Stor shall have no obligation hereunder with respect to any claim received by Therma-Stor after the expiration of the
applicable warranty period. As a further condition to obtaining warranty coverage hereunder, the Customer must present forms
of invoices evidencing proof of purchase of a Product. If such invoices do not clearly indicate the date of initial purchase by
a Customer, the applicable Product’s date of manufacture will be used instead of the date of initial purchase for the purpose
of calculating the commencement of the applicable warranty period. Warranty service must be performed by Therma-Stor or
a servicer authorized by Therma-Stor. In order to obtain warranty service, the Customer should call Therma-Stor at 1-800-
533-7533 and ask for the Therma-Stor Products Service Department, which will then arrange for applicable warranty service.
Warranty service will be performed during customary, daytime working hours. If the Product must be shipped for service,
Customer shall be solely responsible for properly packaging the Product, for all freight charges, and for all risk of loss associated
with shipment.
Limitation of Liability. IN NO EVENT SHALL THERMA-STOR, IN CONNECTION WITH THE DESIGN, SALE, INSTALLATION,
USE, REPAIR, REPLACEMENT OR PERFORMANCE OF ANY PRODUCT, COMPONENT, PART THEREOF OR WRITTEN
MATERIAL PROVIDED THEREWITH, BE LIABLE, TO THE EXTENT ALLOWED UNDER APPLICABLE LAW, UNDER ANY
LEGAL THEORY FOR ANY SPECIAL, DIRECT, INDIRECT, COLLATERAL OR CONSEQUENTIAL DAMAGES OF ANY KIND.
NOTWITHSTANDING THE ABOVE LIMITATIONS AND WARRANTIES, THE SOLE AND EXCLUSIVE LIABILITY OF THERMA-
STOR, REGARDLESS OF THE NATURE OR THEORY OF THE CLAIM, SHALL UNDER NO CIRCUMSTANCES EXCEED THE
PURCHASE PRICE OF THE PRODUCT, COMPONENT OR PART UPON WHICH THE CLAIM IS PREMISED.
Applicable Law and Venue. ANY ARBITRATION, ENFORCEMENT OF AN ARBITRATION OR LITIGATION RELATED TO
THE PRODUCT WILL BE BROUGHT EXCLUSIVELY IN DANE COUNTY, WISCONSIN, AND CUSTOMER CONSENTS TO THE
JURISDICTION OF THE FEDERAL AND STATE COURTS LOCATED THEREIN, SUBMITS TO THE JURISDICTION THEREOF
AND WAIVES THE RIGHT TO CHANGE VENUE. CUSTOMER FURTHER CONSENTS TO THE EXERCISE OF PERSONAL
JURISDICTION BY ANY SUCH COURT WITH RESPECT TO ANY SUCH PROCEEDING.
Miscellaneous. If any term or condition of this Limited Warranty is found by a court of competent jurisdiction to be invalid,
illegal or otherwise unenforceable, the same shall not affect the other terms or conditions hereof or thereof or the whole of
this Limited Warranty. Any delay or failure by Therma-Stor to exercise any right or remedy will not constitute a waiver of
Therma-Stor to thereafter enforce such rights.

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19
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[phone]
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