Electrical Specifications

			Control
Model	Voltage	Amps	Voltage

920-0074	230 / 208	2.2	24V

		For Use with the
	Model	Following Units

		QW2S-A, -B, -C
	920-0074	QW3S-A, -B, -C
	920-0074	QW4S-A, -B, -C
		QW4S-A, -B, -C
		QW5S-A, -B, -C

GENERAL DESCRIPTION

The Energy Recovery Ventilator was designed to provide energy efficient, cost effective ventilation to meet I. A. Q. (Indoor Air Quality) requirements while still maintaining good indoor comfort and humidity control for a variety of applications such as schools, classrooms, lounges, conference rooms, beauty salons and others. It provides a constant supply of fresh air for control of airborne pollutants including CO2, smoke, radon, formaldehyde, excess moisture, virus and bacteria.

The ventilator incorporates patented rotary heat exchange state-of-the-art technology to remove both heat & moisture and provides required ventilation to meet the requirements of ASHRAE 62.1 standard.

It is designed as a single package which is factory installed. The package consists of a unique rotary Energy Recovery Cassette that can be easily removed for cleaning or maintenance. It has two 15-inch diameter heat transfer wheels for efficient heat transfer. The heat transfer wheels use a permanently bonded dry desiccant coating for total heat recovery.

Ventilation is accomplished with 2 blower/motor assemblies each consisting of a drive motor and dual blowers for maximum ventilation at low sound levels. Motor speeds can be adjusted so that air is exhausted at the same rate that fresh air is brought into the structure thus not pressuring the building. The rotating energy wheels provide the heat transfer effectively during both summer and winter conditions.

NOTE: Operation is not recommended below 5°F outdoor temperature because freezing of moisture in the heat transfer wheel can occur.

CONTROL REQUIREMENTS

1.Indoor blower motor must be run whenever the ERV is run.

2.Select the correct motor speed on the ERV. Using Table 1 of the ERV Installation Instructions determine the motor speed needed to get the desired amount of ventilation air needed. For instance, do not use the high speed tap on a ERV if only 200 CFM of ventilation air is needed. Use the low speed tap. Using the high speed tap would serve no useful purpose and would effect the overall efficiency of the air conditioning system. System operation costs would also increase.

3.Run the ERV only during periods when the conditioned space is occupied. Running the ERV during unoccupied periods wastes energy, decreases the expected life of the ERV, and can result in a large moisture buildup in the structure. The ERV can remove up to 60 to 70% of the moisture in the incoming air, not 100% of it. Running the ERV when the structure is unoccupied allows moisture to build up in the structure because there is little or no cooling load. Thus, the air conditioner is not running enough to remove the excess moisture being brought in. Use a control system that in some way can control the system based on occupancy.

NOTE: The Energy Recovery Ventilator is NOT a dehumidifier.

IMPORTANT

Operating the ERV during unoccupied periods can result in a build up of moisture in the classroom.

Manual 2100-533A

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920-0074 qwserv specifications

The Bard 920-0074 QWServ is an innovative heating and cooling system designed to provide optimal performance in a wide range of applications. This unit is particularly suited for use in commercial and industrial settings, where efficiency and reliability are paramount. With its advanced features and cutting-edge technology, the Bard 920-0074 QWServ stands out as a leader in climate control solutions.

One of the main features of the Bard 920-0074 QWServ is its robust construction, which ensures durability and longevity in harsh environments. The unit is designed with a steel cabinet that is galvanized to prevent corrosion, making it suitable for both indoor and outdoor installations. Its compact design allows for easy integration into existing structures without requiring significant modifications.

The Bard 920-0074 QWServ utilizes a powerful heat pump system, which is capable of both heating and cooling, ensuring year-round comfort. The heat pump operates efficiently, utilizing advanced refrigerant technology that minimizes energy consumption and reduces operational costs. This energy-efficient design not only helps save on utility bills but also promotes environmentally friendly operation by lowering carbon emissions.

In terms of control technologies, the Bard 920-0074 QWServ is equipped with advanced digital controls that allow for precise temperature regulation and easy programming. This feature enables users to set schedules and temperature zones according to their specific needs, enhancing comfort and efficiency. Additionally, the system is compatible with smart building technologies, allowing for remote monitoring and control via mobile devices or building management systems.

Another key characteristic of the Bard 920-0074 QWServ is its noise reduction technology. The unit operates quietly, making it ideal for settings where noise pollution can be an issue, such as schools, offices, and healthcare facilities. The combination of sound-absorbing materials and advanced fan design contributes to a peaceful indoor environment.

Overall, the Bard 920-0074 QWServ is engineered for high performance and reliability, making it an excellent choice for those seeking an efficient heating and cooling solution. With features that prioritize energy efficiency, durability, and user-friendly controls, this unit meets the demands of modern commercial and industrial applications, ensuring comfort and satisfaction for its users.