Tempro two-stage line voltage thermostats for ventilation provide precise control of airflow and temperature in industrial and commercial environments. These thermostats regulate fan operation and damper actuation across a range of HVAC and refrigeration systems, supporting both indoor and outdoor installations.
View full product line of two-stage line voltage thermostats for ventilation.
Design Features of Two-Stage Line Voltage Thermostats for Ventilation
Each unit is housed in either a NEMA 1 steel, stainless steel, or NEMA 4X rated enclosure to meet varying environmental demands, including resistance to dust, minor splashing, or high-pressure washdowns. Users can select between fixed bulb and remote bulb sensor configurations. A standard 6-foot sensor cord enhances installation flexibility in tight or remote control spaces.
Functional Operation of Two-Stage Line Voltage Thermostats
These thermostats utilize an SPDT/SPDT switching configuration to manage multi-stage ventilation responses. When ambient temperature reaches the initial setpoint, the first switch energizes a single-speed fan. If the temperature increases approximately 3°F beyond the first threshold, the second switch activates, triggering either a damper motor or an additional fan. This two-stage response enhances thermal regulation without manual intervention.
Refer to Figure 4 to the right for a detailed wiring diagram illustrating the progressive control sequence from initial fan activation to secondary ventilation engagement.
Technical Specifications
- Temperature Range: –30°F to 110°F
- Differential: Fixed differential of +/- 2°F; adjustable differential models available
- Sensor Options: Fixed bulb or remote bulb
- Cord Length: 6 feet (standard)
- Configurations: Available in single-stage and two-stage models
- Branding: Custom labeling available to meet OEM specifications
Application Use Cases
- HVAC Ventilation Systems: Enables sequential fan control for maintaining airflow and thermal balance in commercial ventilation setups.
- Industrial Process Facilities: Regulates air movement to stabilize internal temperatures across production or processing zones.
- Refrigeration Equipment: Supports ventilation management within walk-in coolers and other temperature-sensitive units.
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