Refrigeration temperature controlBulb and Capillary Thermostats play an important role in HVAC (Heating, Ventilation, and Air Conditioning) applications due to their simplicity and cost-effectiveness. These thermostats consist of a sensing bulb connected to the main unit via a capillary tube. This setup enables them to sense temperature at a remote location and control the HVAC system accordingly. For additional information on our line of bulb and capillary thermostats, click here.

How Do Bulb and Capillary Thermostats Work?

Firstly, the fluid within the capillary tube expands or contracts as the temperature changes, causing pressure changes. These pressure changes transmit to a diaphragm within the thermostat, which operates a set of contacts that control the HVAC system’s heating or cooling equipment.

When the temperature reaches the desired point, the capillary thermostat maintains the setpoint by modulating the heating or cooling system. For instance, if the temperature drops below the set point, the thermostat activates the heating system until reaching the desired temperature. Conversely, if the temperature exceeds the set point, the cooling system engages until the temperature returns within the desired range.

Stemco 351-254476 Capillary ThermostatKey HVAC Applications for Bulb and Capillary Thermostats

Bulb and Capillary Thermostats serve various HVAC systems, including:

  • Air Conditioners: These thermostats control the cooling cycle in air conditioners, ensuring the conditioned space maintains the set temperature.
  • Water Heaters: They regulate the heating element in water heaters, maintaining the desired water temperature.
  • Dehumidifiers: These thermostats in dehumidifiers control humidity levels, activating or deactivating the unit as needed.
  • Cold Storage Units: In commercial cold storage units, these thermostats regulate the temperature, ensuring proper storage conditions for perishable goods.

Benefits of Bulb and Capillary Thermostats

Bulb and Capillary Thermostats enhance the performance and efficiency of HVAC systems through several benefits:

  • Precision: Their ability to sense and control temperature at remote locations allows for accurate temperature regulation.
  • Reliability: The mechanical nature of these thermostats ensures consistent performance over time.
  • Energy Efficiency: By precisely controlling heating and cooling cycles, these thermostats contribute to energy savings and reduced operational costs.
  • Versatility: Their adaptability makes them suitable for a wide range of applications, from residential HVAC systems to large-scale industrial setups.

Future Prospects for Bulb and Capillary Thermostats in the HVAC Industry

As technology advances, HVAC Bulb and Capillary Thermostats will continue to play a key role in HVAC solutions, benefiting both occupants and the environment. Innovations in materials and design may lead to even greater efficiency and reliability, further enhancing their role in creating comfortable and sustainable indoor environments.

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Bulb & Capillary Thermostats

Original equipment manufacturers worldwide use thermostat switches designed and manufactured by STEMCO, a Division of Senasys. No matter which style or model you choose, all of the capillary thermostat switches operate using the same physics. A fluid is encapsulated in a metal and when the temperature changes the fluid either expands or contracts. This fluid change moves a diaphragm which is in touch with a snap action switch and either opens or closes a circuit.

Ambient Compensation

Our capillary thermostats can be ambient compensated to offset the differential in temperature which keeps our thermostat controls more accurate as it’s environment changes.

Custom Options

Capillary thermostat switches built by Senasys can also be built to customer specifications. This insures you get the exact control you want without paying for features you don’t need.