Return Air
Supply
Outdoor Air

Mixing Box Controls

The mixing box (shown at right) includes outdoor air and return air low leakage control dampers in a face and bypass configuration. Either two inch pleated or aluminum mesh filters are available within the mixing box section. Double wall construction is optional.

A mixing box control option must be specified for every IGX-HV unit. Greenheck offers eight mixing box control options that accommodate a wide variety of applications. The four EC and four MB options are described below. Specify only one control box option per unit.

Mixing Box Controls with Economizer Cooling

The economizer controls package enables free cooling using outdoor air. All EC options include a modulating actuator for controlling outdoor and return air dampers, and a minimum outdoor air positioner. During a call for heating the economizer is locked out and the outdoor air damper holds at the minimum position.

EC1: Outdoor Temperature Reference

The economizer controller positions the mixing box dampers to achieve 55° F mixed temperature when the thermostat calls for cooling AND the outdoor air temperature is below the economizer

setpoint. If outdoor air temperature is

between 55° F and the economizer setpoint, the dampers will modulate to the 100% outdoor air position. Above the setpoint, the outdoor air damper is held at the minimum position. The setpoint is field adjustable and the outdoor air sensor

is factory mounted.

EC2: Outdoor Enthalpy Reference

Same as EC1, except economizer setpoint is based on outdoor air enthalpy.

EC3: Airstream Temperature Reference

The economizer controller compares the temperatures of the outdoor air and return air when the thermostat calls for cooling. The mixing box dampers are then

positioned to maximize the airflow of the cooler airstream. When outdoor air temperature is sufficiently cool, the mixing

box dampers will modulate to provide 55° F mixed air. The outdoor air sensor is factory mounted. The return air sensors are field installed.

EC4: Airstream Enthalpy Reference

Same as EC3, except airstream enthalpy values are compared.

Mixing Box Controls (no economizer)

In addition to the EC options described above, Greenheck offers four MB mixing box control options for applications where a factory provided economizer package is not desired.

MB1: Minimum Outdoor Air Positioner

The MB1 option includes a modulating actuator and potentiometer that control the outdoor air and return air damper positions. When the unit is energized, the dampers will travel to the position corresponding to the potentiometer

setting, providing the desired amount of outdoor air. When the unit is powered off, the outdoor air damper closes to prevent backdrafting. To adjust the damper settings, simply dial the potentiometer (shown above) to desired operating position of the outdoor air damper.

MB2: 2-10 Volt External Signal

The MB2 option includes a modulating actuator that is controlled by an external 2-10 volt signal. This option is appropriate for applications that call for a building

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automation system that will control the mixing box dampers.

MB3: 4-20 mA External Signal

The MB3 option includes a modulating actuator that is controlled by an external 4-20 mA signal. Like the MB2 option, this option is appropriate for applications that call for a building automation system that will control the mixing box dampers.

MB4: Manual Quadrant

The MB4 option consists of a manual quadrant that enables the outdoor air and return air dampers to be secured into a single position. The primary

function is to introduce the specified minimum outdoor air volume during operation. Dampers remain in the same position when the unit is powered off.

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Greenheck Fan IGX-HV manual Mixing Box Controls with Economizer Cooling, Mixing Box Controls no economizer

IGX-HV specifications

The Greenheck Fan IGX-HV is a groundbreaking product tailored for high-volume, low-pressure ventilation applications. Engineered for optimal performance, the IGX-HV series stands out in the market due to its design and technology, which are focused on delivering efficient airflow solutions while ensuring energy conservation.

One of the key features of the IGX-HV is its robust construction, which includes a galvanized steel housing that offers durability and resistance to corrosion. This is particularly important in environments where the fan may be exposed to harsh conditions. The fan is designed with an integrated mounting system that simplifies installation and provides long-term reliability.

In terms of performance, the IGX-HV is equipped with Greenheck's innovative EHX™ motor technology, which enhances efficiency and reduces energy consumption. This permanent split capacitor motor is designed to operate at optimal levels, contributing to lower operational costs. Additionally, the fan is available in a range of sizes and configurations, catering to the diverse needs of commercial and industrial applications.

The IGX-HV also features a backward-inclined wheel that contributes to its high efficiency and reduced noise levels. This design not only increases performance but also minimizes turbulence, creating a quieter operating environment. The fan’s aerodynamic profile ensures that it can handle large volumes of air, making it ideal for use in spaces such as warehouses, manufacturing facilities, and large retail environments.

Another notable characteristic of the Greenheck IGX-HV is its user-friendly interface, which provides easy access to control and monitoring systems. This allows facility managers to easily adjust settings and track performance metrics, streamlining maintenance processes and enhancing operational efficiency.

Moreover, the IGX-HV complies with the latest energy efficiency standards, making it a sustainable choice for businesses looking to minimize their environmental impact. By integrating advanced technologies, such as variable speed drives, the fan can adjust its performance based on the actual demand, further optimizing energy usage.

In summary, the Greenheck Fan IGX-HV is a versatile and efficient solution for high-volume ventilation needs. Its combination of durable construction, advanced motor technologies, and user-friendly features makes it an excellent choice for a variety of applications, positioning it as a leader in the ventilation industry. Whether for industrial or commercial use, the IGX-HV meets the demands of modern ventilation systems while emphasizing energy efficiency and performance.