Capillary Switch in Hot Water Application

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Water heaters play a vital role in various appliances, and their efficient functioning is often reliant on a small but significant component – capillary thermostat. In this blog post, we will dive into the importance of capillary switches in both commercial style dishwashers and household dishwashing appliances. For more information on our products, click here.

Capillary Thermostat for Water Heater

Most commercial-style dishwashers, and even several household types, are equipped with one or two capillary switches within their systems. The capillary switch is a temperature-sensing device that ensures precise control over the water temperature during the heating process.

358W-136 Capillary ThermostatThe capillary switch’s bulb will be immersed directly into the water or contained within a thermowell, This bulb or probe is responsible for monitoring the temperature of the water. The capillary switch operates in either a fixed temperature style or an adjustable range style, offering flexibility based on the specific requirements of the appliance. When the water heater is turned on, the capillary switch’s bulb senses the temperature and activates the heating elements accordingly. Once the calibrated temperature is reached, the capillary switch turns off the heater until the water temperature cools to a pre-set or calibrated level. This cyclical process ensures that the water remains at the desired temperature without excessive heating.

To further enhance safety and prevent overheating, a second capillary can be incorporated as a limit switch. This limit capillary acts as a safeguard against a runaway condition, where the heaters might excessively heat the system. The second capillary can be designed as either a manual reset, requiring human intervention to restart, or an automatic reset, allowing the system to resume normal operation once the temperature has dropped to a safe level..

This same design is used to heat or cool many other fluids such as food grade oils, lubricants, chemicals and solvents. The better quality capillary thermostat switches, such as ours, can be ambient temperature compensated. The less expensive ones are not.

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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.