Vari-Green HOA (Hand/Off/Auto)
The Vari-Green transformer provides a 24-volt power source from the existing line voltage at the fan to the motor and controls. It has two dry auxiliary contacts (one normally open and one normally closed) available to signal a motorized damper or interlock with other devices.
Vari-Green Remote Dial or Touch Remote
The remote dial or touch remote allows the user to manually adjust a fan’s speed from a remote location. These controls mount to a wall using a 2x4 junction box and are supplied with a wall cover plate. The 24VDC transformer, described above, is included with all orders. The Touch Remote includes a countdown timer to automatically turn the fan off after 10, 30, 60 or 90 minutes.
Vari-Green Two-Speed Control
The two-speed control allows motor RPM (fan speed) to operate between two discreet speeds (A or B). There are two methods for switching between speeds:
- SPDT switch or relay connected to the dry contact input.
- Wet voltage (115-230VAC) applied to the digital input terminal
The two-speed control includes a 24VDC transformer and accepts an input voltage of 115/208-240V.
Vari-Green Indoor Air Quality – Temperature / Humidity Control
The Indoor Air Quality – Temperature / Humidity control monitors the temperature and/or relative humidity in a space. It will automatically adjust the ventilation rate to or from a space by increasing or decreasing the speed of the fan based on the desired set point.
Vari-Green Indoor Air Quality – VOC Control
The Indoor Air Quality – VOC control senses the level of Volatile Organic Compounds (VOCs) in a space and automatically adjusts the ventilation rate to the space by increasing or decreasing the speed of the fan based on the level of VOCs present. Ventilating based on the VOC concentration assures the space will not be over or under ventilated. Up to 10,000 unique VOCs exist, and Greenheck’s VOC sensor reacts to all of them.
Vari-Green Constant Pressure Control
The Constant Pressure control is quite versatile and can be used to monitor either the static pressure or velocity pressure in a system. The control will automatically adjust the fan speed to maintain a desired static pressure or velocity pressure (used for constant CFM) in the system. This control will reduce energy consumption not only by reducing the speed and the energy used by the fan, but will also reduce the amount of conditioned air that is exhausted.
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