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Read the installation, operation and maintenance instructions 
carefully before installing and operating this device. Proper 
adherence to these instructions is essential to obtain maximum 
benefit from your Ultra-Aire 90H indoor air quality system. 

READ AND SAVE THESE INSTRUCTIONS 

•  The device is designed to be installed INDOORS IN A SPACE THAT 

IS PROTECTED FROM RAIN AND FLOODING. 

•  Install the unit with space to access the front panel for 

maintenance and service. DO NOT INSTALL UNIT WITH THE FRONT 
PANEL INACCESSIBLE. 

•  Avoid directing the discharge air at people, or over the water in 

pool areas. 

•  If used near a pool or spa; be certain there is NO chance the unit 

could fall into the water, splashed and that it is plugged into a GFCI 
GROUND FAULT CIRCUIT INTERRUPT OUTLET. 

•  DO NOT use the device as a bench or table. 

• DO NOT place the device directly on structural members.

•  A drain pan MUST be placed under the unit if installed above a 

living area or above an area where water leakage could cause 
damage.

SAFETY PRECAUTIONS

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Ultra-Aire 90H Installer’s & Owner’s Manual

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Ultra-Aire 90H Installer’s & Owner’s Manual

Summary of Contents for Ultra Aire 90H

Page 1: ...emoved by the evaporator coil is returned to the air stream resulting in an overall temperature increase from the incoming air Fresh Air Ventilation optional Fresh air may be ducted to the unit and re...

Page 2: ...H Fresh Air AND Damper 8 4 6F DEH 3000 Digital Controller WITHOUT Fresh Air 8 4 7 Humidity Control Adjustment 8 4 8 Fan Filter Switch 8 4 9 Ventilation Timer 9 4 9A Setting the Time 9 4 9B Ventilation...

Page 3: ...nel for maintenance and service DO NOT INSTALL UNIT WITH THE FRONT PANEL INACCESSIBLE Avoid directing the discharge air at people or over the water in pool areas If used near a pool or spa be certain...

Page 4: ...e Wiring Unit location should be in an area where field wiring the remote controls low voltage to the unit will be possible n 4 1D Back Draft Damper It is recommended that a back draft damper be used...

Page 5: ...Kit An optional condensate pump kit is available from the factory for use with the UA 90H Condensate is automatically pumped to a remote location when the water level in the pump s reservoir rises to...

Page 6: ...r 4 Exhaust fans are recommended in the bath rooms and kitchen In cold climates or areas where the outdoor dew point is low at times ventilation can be used to dehumidify the structure making the UA 9...

Page 7: ...make up air Adjust a damper in the duct to provide the desired 4 4E Installation in a Structure with No Existing Forced Air HVAC System When installing the UA 90H in a structure that does not have a...

Page 8: ...installed in the fresh air duct When the fan filter switch is in the OFF position the damper is closed The UA 90H will then circulate and dehumidify air to provide humidity control When the fan filte...

Page 9: ...s on a 24 hour military time clock 4 9B Ventilation Schedule Slide the switch in the upper right hand corner to the program symbol P ON will appear to the right of the time and the number 1 will appea...

Page 10: ...o 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 Te...

Page 11: ...n COM NO COM NC ON CLOSED OPEN OFF OPEN CLOSED Common uses assuming standard thermostat wiring color schemes as noted Disengage A C during dehumidification Redirect the yellow thermostat wire to the N...

Page 12: ...ing the ON OFF button 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...

Page 13: ...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 5 3C On Off Setting Press the ON OFF button to turn...

Page 14: ...entilating or dehumidifying while the fan is running Common reasons for operating the fan continuously are filtration and air recirculation AUTO indicates the fan will run when the control calls for d...

Page 15: ...he indicated damper mode and return to home 5 3H Intermittent or Programmed Ventilation The system will operate the ventilation function according to the current ventilation program The control needs...

Page 16: ...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...

Page 17: ...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 Control Part No 4026570 UA Base Unit Y...

Page 18: ...lters are labeled with a MERV rating number which measures a filter s ability to trap particles ranging in size from 3 0 microns to 10 0 microns Residential filters commonly have MERV ratings of 1 12...

Page 19: ...8 Wiring Diagrams ULTRA AIRE 90H WIRING DIAGRAM UA 90H with Humidity Fan Control 4024155 UA 90H with Ventilation Timer Humidity Fan Control 4024125 19 Ultra Aire 90H Installer s Owner s Manual...

Page 20: ...with Filter Box 8 4026451 Condensate Pump Kit UA 90H not shown 9 4026450 Leveling Foot Kit UA 90H not shown 10 4020646 10 Backdraft Damper not shown 11 4023660 Controller Humidity 12 4023672 Duct Damp...

Page 21: ...ator Strainer Capillary Tube Assembly FOR HVAC INSTALLER ONLY FOR HOMEOWNER ROUTINE MAINTENANCE Item Part No Description 1 4026151 14 x14 x1 Standard UA 90 H Filter 2 4024369 2 x20 x24 Filter not show...

Page 22: ...2 Humidity control set too high or defective 3 Loose connection in internal or control wiring 4 Defective Compressor relay 5 Defective control transformer 6 Optional Condensate Pump Safety Switch open...

Page 23: ...tor but no start capacitor or relay CAUTION CAUTION ELECTRICAL SHOCK HAZARD Electrical power must be present to perform some tests These tests should be performed by a qualified service person 11 5 El...

Page 24: ...casters Step 1 Lay the unit on it s side Make sure the filter door is facing upward Note the locations of the four leveling feet and the hose adaptor Step 2 Partially screw in the leveling feet at the...

Page 25: ...the long end into the condensate pump and the short end onto the adaptor Make sure that the hose fully covers the adaptor barbs Step 9 Adjust the height of the leveling feet to move the level bubble i...

Page 26: ...ND EXCLUSIONS This warranty does not cover any defect malfunction etc resulting from misuse abuse lack of normal care corrosion freezing tampering modification unauthorized or improper repair or insta...

Page 27: ...n any form or by any means electronic or mechanical for any purpose without the express written permission of Therma Stor LLC 2006 Therma Stor LLC All rights reserved PO Box 8680 Madison WI 53708 Phon...

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