Control Options for Energy Recovery Ventilators

Greenheck offers a full range of control options for energy recovery units. From the basic offering of sensors mounted and wired by Greenheck to the advanced offering of a microprocessor controller, there are controls to fit nearly every application.

Control Options for Energy Recovery Ventilators


  • Sensors Provided by Greenheck

    Greenheck's selection includes a standard offering of temperature, pressure, and current sensors that take measurements throughout the unit. The sensors are routed back to the unit control center to be interfaced with a field-mounted (by others) Building Management System (BMS) controller.

  • Space Temperature Control

    Space Temperature Control

    Space temperature control is available on units with DX cooling, electric heat, or indirect-gas heat. The unit will be equipped with the following terminals to allow a room thermostat (provided by Greenheck or others), humidistat (provided by Greenheck or others), or BMS to send the following signals:

    * A call for cooling
    * A call for heat
    * An occupied/unoccupied signal
    * A call for dehumidification.

  • Discharge Temperature Control

    Discharge temperature controls are available on models ERH, ERCH, ERT, and APEX.

  • Analog Discharge Temperature Control

    Analog Discharge Temperature Control

    The analog discharge temperature control is a series of unit-mounted thermostats that will control the following:

    * Occupied/unoccupied mode based on BMS control or 7-day time clock (by Greenheck or others)
    * Heating/Cooling mode based on outdoor air dry bulb temperature
    * Discharge temperature will be controlled with a temperature sensor mounted at the unit discharge
    * Discharge dew point will be controlled with a temperature sensor mounted after the cooling coil.

  • Microprocessor Discharge Temperature Control

    Microprocessor Discharge Temperature Control

    One of the main advantages of the microprocessor controller is the ability to communicate with a BMS through networks such as Lon, BACnet, or Modbus. This allows the BMS to not only monitor the energy recovery unit, but also to control unit parameters.

    The microprocessor controller offers improved control effectiveness through easy monitoring and adjustment of unit parameters by way of a LCD readout and a simple keypad. Some of the adjustable parameters include:

    * Discharge temperature or room temperature (optional room temperature sensor)
    * Discharge dew point temperature
    * Occupied/Unoccupied schedule
    * Heating and cooling lockout temperatures
    * Time delays.

    There are also many functions built into the controller to maximize the energy efficiency of the unit. Some of these functions include:

    * Automatic supply discharge temperature reset that minimizes heating and cooling costs
    * Automatic discharge dew point temperature reset based on a room humidistat (optional)
    * Economizer control based on outdoor air temperature and supply temperature (optional).

  • Remote Interface

    Remote Interface

    The optional remote interface provides flexibility to the end-user as every control point parameter can now be accessed remotely. The remote interface is available as an accessory to the microprocessor or network interface.

Other Info

Application Manual

Technical Information

  • The Importance of ARI Certification
  • Airxchange Product Support

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  • AMCA and ETL Certifications

    Greenheck's Energy Recovery products are AMCA Licensed for Air Performance and ETL Listed. Click on the links below for a listing of AMCA Licensed and ETL Listed products.
    AMCA Licensed Products
    ETL Listed Products

  • ARI Certification

    To guarantee your customers are getting the performance they request, check for ARI Certification. ARI Certified products are tested for energy transfer effectiveness (sensible, latent, and total), cross leakage, and pressure drop. If a manufacturer states that their products are tested "in accordance with" ARI Standards that DOES NOT mean they are certified. To be certified, products must be tested by ARI and have annual check tests.

    Click here for a listing of ARI Certified Energy Recovery products. Download the Supplemental Directory.

  • Psychometric Chart

    A psychometric chart is a design tool to graph a building's HVAC thermodynamic air conditions and processes. Properties displayed on a chart include dry-bulb temperatures, wet-bulb temperatures, dew point temperatures, relative humidity, humidity ratio, specific volume, and enthalpy. A link is provided to a downloadable software program that allows the user to electronically plot conditions on a psychrometric chart. This program version permits the user to enter state points and graph the air conditioning process, while also calculating additional air properties.

    Click here to download the psychrometric charting software.

    Help Text for Standard Version of Psychrometric Chart

  • Wording for ARI Certified Wheels, Options, and Accessories

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