Pool and spa systems use several control devices to regulate water temperature, control heating equipment, and manage supporting components such as ventilation fans. Depending on the application, manufacturers may use capillary thermostats for water temperature regulation or sequencing air switches to control heaters and fans. These controls support residential, commercial, and recreational pool and spa equipment.
Capillary Thermostats for Spa Temperature Control
Capillary thermostats regulate water temperature in spas and hot tubs. A sensing bulb installed in the water or inside a thermowell responds to temperature changes and actuates the control through a liquid-filled capillary system.
When water temperature drops below the setpoint, the thermostat energizes the heating circuit. As temperature rises, the thermostat opens the circuit and stops the heating cycle. Some designs also provide high-limit protection by disconnecting power if water temperature exceeds a predetermined value.
Capillary thermostats are commonly used where stable water temperature and mechanical temperature control are required.
Read more about capillary thermostats for spa systems
Sequencing Air Switches for Pool Equipment Control
Sequencing air switches provide pneumatic control of multiple electrical loads within pool systems. These switches commonly control pool heaters and ventilation fans through a programmed operating sequence.
In many installations, the air switch activates the fan before energizing the heater. This sequence establishes airflow before heat generation begins and allows multiple devices to operate from a single user control point.
Because the switch operates pneumatically, the user remains isolated from electrical current. Sequencing air switches are frequently used in pool equipment, spa equipment, whirlpool tubs, and related recreational water systems.
Learn more about sequencing air switches for pool heaters and fans
Control Solutions for Pool & Spa Equipment
Pool and spa systems often require both temperature regulation and equipment control. Capillary thermostats regulate water temperature within the heating system, while sequencing air switches coordinate the operation of heaters and ventilation equipment. Together, these controls support reliable operation across a wide range of pool and spa applications.
For assistance selecting a control for your application, contact Senasys for OEM pricing, product recommendations, or engineering support.
