FOR HVAC INSTALLER ONLY

Unit not providing ventilation. Ventilation timer not operating correctly.

1.If timer is not functioning correctly reset timer and reprogram.

2.Check control wire connections (check connections at fresh air damper also).

3.Defective fresh air damper.

4.Defective fan switch.

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.

3.Unit has entered defrost cycle.

4.Air filter dirty.

5.Defective defrost thermostat.

6.Low refrigerant charge.

7.Air leak such as loose cover or ducting leaks.

8.Defective compressor.

9.Restrictive ducting.

10.Optional Condensate Pump Safety Switch open.

Unit Test to determine problem:

1.Detach field control wiring connections from main unit.

2.Connect the yellow and green pigtails from the main unit together; only the fan should run. Disconnect the wires.

3.Connect the yellow and blue pigtails from the main unit together; the compressor and fan should run.

4.If these tests work, the main unit is working properly. You should check the control panel and field control wiring for problems next.

5.Remove the control panel from the mounting box and detach it from the field installed control wiring. Connect the blue, yellow, and green wires from the control panel directly to the corresponding colored pigtails on the main unit. Leave the violet, white and red wires disconnected!

6.Turn on the fan switch; the fan should run. Turn off the fan switch.

7.Turn on the humidity control; the compressor and fan should run.

8.If these tests work, the problem is most likely in the field control wiring.

11.3 Refrigerant Charging

If the refrigerant charge is lost due to service or a leak, a new charge must be accurately weighed in. If any of the old charge is left in the system, it must be recovered before weighing in the new charge. Refer to the unit nameplate for the correct charge weight and refrigerant type.

11.4 Compressor/Capacitor Replacement

This compressor is equipped with a two terminal external overload and a run capacitor, 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 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. 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 damper opens in one direction only. The damper rotates very slowly, allow sufficient time for the damper to cycle. The damper will take approximately one minute to cycle from closed to open or from open to closed.

If the electric ventilation damper fails to operate:

1.Check that the wiring is correct and that voltage is present at the damper motor.

2.Check for any obstruction inside the damper. If the electric ventilation damper fails to operate after performing these checks, it must be replaced.

11.6 Condensate Pump Kit

An optional condensate pump kit is available from the factory for use with the UA-90H. Condensate is automatically pumped to a remote location when the water level in the pump’s reservoir rises to close the float switch. The pump also contains a safety float switch. The white leads from this switch extend from beneath the pump cover. This switch should be installed in series with the field wire that connects the blue (#5) lead from the UA-90H to the blue (#5) lead on the control panel. If the pump fails, this switch opens the compressor control circuit and stops water production before the reservoir overflows. The UA-90H will continue to ventilate or circulate air as normal, but will not dehumidify until this switch closes. See following pages for more information.

23

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

Page 22 Page 24
Page 23
Image 23
Therma-Stor Products Group 90H Refrigerant Charging, Compressor/Capacitor Replacement, Electric Ventilation Damper
Page 22 Page 24

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.
Top Page Image Contents