For Hvac Installer and Homeowner

Figure 4

Fan/Filter Switch

Figure 3

Humidity Control Adjustment Knob

To determine how each control operates the UA-90H, it must first be determined which control is being used and whether or not the 90H is ducted for fresh air ventilation. Refer to appropriate section.

Humidity/Fan Control Panel (P/N 4024155) (Figure 1, p.7)

4.6A Humidity/Fan Control Panel WITHOUT Fresh Air Ventilation or Damper

4.6B Humidity/Fan Control Panel WITH Fresh Air

Ventilation and WITHOUT Damper

4.6C Humidity/Fan Control Panel WITH Fresh Air Ventilation AND Damper

Ventilation Timer/Humidity Control Panel (P/N 4024125) (Figure 2, p.7)

4.6D Ventilation Timer and Humidity Control WITH Fresh Air AND Motorized Damper

DEH 2000 Digital Control (P/N 4024539) (Figure 1, p.10)

4.6E Digital Controller WITH Fresh Air AND Damper

4.6F Digital Controller WITHOUT Fresh Air

4.6A Humidity/Fan Control Panel WITHOUT Fresh Air Ventilation or Damper

The humidity/fan control panel automatically controls the humidity of the living space. The humidity/fan control panel contains an adjustable humidity control and a fan switch. The panel has a cover that must remain open to the air within the living space for accurate humidity sensing. When the fan switch is in the “ON” position, air will be continually filtered and circulated throughout the home. For humidity control operation refer to section 4.7.

4.6B Humidity/Fan Control Panel WITH Fresh Air Ventilation and WITHOUT Damper

The humidity/fan control panel automatically controls the humidity of the living space. The humidity/fan control panel contains an adjustable humidity control and a fan switch. The panel has a cover that must remain open to the air within the living space for accurate humidity sensing. Outside air is continually introduced whenever fan is “ON.” Manual operation of fan filter switch controls outside air ventilation. Since the fan operates whenever the UA-90H is dehumidifying outside air will also be introduced. For humidity control operation refer to section 4.7.

4.6C Humidity/Fan Control Panel WITH Fresh Air Ventilation AND Damper

In this configuration, a motorized damper has been installed in the fresh air duct. When the fan/filter switch is in the “OFF” position, the damper is closed. The UA-90H will then circulate and dehumidify air to provide humidity control.

When the fan/filter switch is in the “ON” position, the motorized damper will open and the fan will run, introducing outside air. The unit may or may not be dehumidifying in the ventilation mode, depending on the humidity control setting. See Section 4.7 for humidity control operation.

4.6D Ventilation Timer and Humidity Control WITH Fresh Air AND Motorized Damper

Refer to sections 4.7 through 4.9C.

4.6E DEH 2000 Digital Control WITH Fresh Air AND Damper

Refer to Section 5.

4.6F DEH 2000 Digital Control WITHOUT Fresh Air

Refer to Section 5.

4.7 Humidity Control Adjustment

Set the humidity control to the desired humidity level for the home. Turning the knob clockwise results in a drier setting. See the back of the control panel cover for set points. The dehumidifier will run continuously until the relative humidity (RH) is reduced to the humidity control dial setting. Setting the humidity control to lower RH levels will NOT increase the dehumidification rate; the unit will

simply run longer to reduce the RH to the setting. The UA-90H unit (and refrigerant-based dehumidifiers in general) will reduce a warm space’s RH to a lower level than that of a cool space. Therefore there is no benefit to set the humidity control to excessively

low levels in cool rooms; doing so will result in long periods of ineffective dehumidifier run time. Settings below 45% are not recommended.

4.8 Fan/Filter Switch

Turning ON the fan/filter switch will cause the UA-90H fan to run continuously, whether the UA-90H is dehumidifying or not. This function is desirable if the unit is used for air circulation and filtration to achieve maximum indoor air quality. When the switch is ON; air will be constantly filtered through the UA-90H and 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.

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

90H specifications

Therma-Stor Products Group 90H is a cutting-edge climate control solution designed for both residential and commercial applications. Renowned for its efficiency and reliability, the 90H model stands out due to its advanced features that cater to various environmental conditions.

One of the key highlights of the Therma-Stor 90H is its dual functionality as both a dehumidifier and an air exchanger, making it a versatile choice for maintaining optimal indoor humidity levels. The unit is engineered to handle spaces up to 2,500 square feet, making it ideal for basements, crawl spaces, and larger living areas.

Incorporating state-of-the-art technologies, the 90H operates using an energy-efficient compressor that significantly reduces power consumption. This not only minimizes operational costs but also contributes to a more environmentally friendly solution. Furthermore, the unit is equipped with variable-speed fans that ensure quiet operation while delivering consistent airflow throughout the space.

Another notable feature of the Therma-Stor 90H is its advanced control system. The integrated humidity control allows users to set precise humidity levels, ensuring that air quality is maintained at optimal levels. The built-in hygrometer continuously monitors indoor humidity, automatically adjusting the unit’s performance to provide the most efficient dehumidification possible.

Durability and ease of use are also key characteristics of the 90H. Constructed with high-quality materials, the unit is designed to withstand the rigors of continuous operation. Its compact design allows for easy installation and portability, making it suitable for virtually any setting.

Additionally, the Therma-Stor 90H features a user-friendly interface with intuitive controls, allowing users to monitor and adjust settings effortlessly. The unit also includes a convenient drainage system, enabling continuous operation without the need for constant manual intervention.

In summary, the Therma-Stor Products Group 90H is an innovative solution for effective moisture management. With its dual-functionality, energy-efficient operation, advanced humidity control, and robust construction, it stands out as a premier choice for maintaining a healthy indoor environment. Ideal for both residential and commercial use, the 90H redefines how we think about climate control and air quality.