What is an aquastat

It's no mystery that an aquastat is a control that goes with a boiler.

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What is an aquastat

An aquastat is a device used in hydronic heating systems for controlling water temperature. If the thermostat is calling for heat, the boiler will fire until the high limit is reached, then shut off even if the thermostat is still calling for heat. The boiler will re-fire if the boiler water temperature drops below a range around the high limit. The high limit exists for the sake of efficiency and safety. The boiler will also fire regardless of thermostat state when the boiler water temperature goes below a range around the low limit, ensuring that the boiler water temperature remains above a certain point. The low limit is intended for tankless domestic hot water; it ensures that boiler water is always warm enough to heat the domestic hot water. This technology-related article is a stub. You can help Wikipedia by expanding it. Contents move to sidebar hide. Article Talk. Read Edit View history. Tools Tools. Download as PDF Printable version. For other uses, see Aquastat disambiguation. This article needs additional citations for verification.

Twitter Link. An aquastat usually comes with the boiler.

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The Aquastat controllers from Resideo are immersion type devices for limiting or regulating the temperature of liquids in boilers, storage tanks, and other applications where temperature control is required. These controllers come in a variety of sizes and ranges for applications that utilize existing wells. This product is sold exclusively through our Professional Partners. Use the Find A Pro link below to locate one in your area. Check with your company admin to get an invite to your company's profile, then create your own account. If your company does not have a Pro Portal yet, have your company admin sign up here. Then you'll be able to select which homeowners see your logo based on the pricing per household consumer will not be charged. These may require some additional connections or parts to perform the same functions. These will replace a wide range of Resideo and competitive controls, which allow you to have less stock on hand. Skip to main content.

What is an aquastat

Heating aquastat sensor probe immersion well thermal-conductive compound is used to assure good thermal contact between the sensor well itself immersed in hot boiler water at a representative location and the aquastat's temperature sensing probe. This article series describes common operating problems with heating system aquastat controls and how these troubles are diagnosed and fixed. InspectAPedia tolerates no conflicts of interest. We have no relationship with advertisers, products, or services discussed at this website. To communicate the temperature of the water in the boiler to the controlling aquastat heat must flow from the boiler water to the surface of the sensor well - basically a steel tube mounted through an opening in the boiler body. Heat flows from the water through the steel of the sensor well to the surface of the aquastat's temperature sensing probe. If this probe is not in very good thermal contact with the interior surface of the sensor well the aquastat may not always control the boiler on-off cycles properly. Boiler aquastat manufacturers like Honeywell recommend two main installation details to assure good thermal contact between the aquastat temperature sensor and the sensor well into which it mounts:. The thermal or heat-conductive compound or "grease" assures good thermal contact between the aquastat temperature sensing probe and the inner surface of the sensor well into which the probe is inserted.

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Reset - Either automatic after high limit is reached, the burner can come on again as soon as the water temperature drops , or manual a person has to come and push the controller reset button to get the burner to function again after a high limit. Comments by Vanilla. A gray sticky substance called conductive compound is often put in the well along with the bulb to assure heat transfer. Tools Tools. This article needs additional citations for verification. This means that much of their inner workings are not common knowledge quite yet. Check out her books and classes. For this reason, the aquastat shuts off the boiler when it reaches the high temperature limit. An aquastat is a device used in hydronic heating systems for controlling water temperature. The high limit exists for the sake of efficiency and safety.

An aquastat relay is a combination of three controls. As its name suggests, it's an aquastat, a relay and a transformer.

The boiler will also fire regardless of thermostat state when the boiler water temperature goes below a range around the low limit, ensuring that the boiler water temperature remains above a certain point. Stat means switch. Capillary Length: If the bulb is remote, the capillary tube has to be long enough to get to the controller. Power sharing Wi-Fi thermostats like Nest may cause false signals if not wired properly to the Energy Manager. If you tried to maintain an exact temperature, the boiler would be turning on and off all the time. Unfortunately, this means that your browser is too old to display our site properly and that certain areas of the site may display incorrectly or not at all. They're just on-and-off switches that control water temperature. Instead of a capillary tube, a wire is used to send a signal from the thermister to the switch. This is the action of a circulator control. When the temperature rises to the setpoint, the switch opens breaks to turn off the burner. You could have a separate aquastat control each. ISBN Categories : Heating, ventilation, and air conditioning Plumbing Technology stubs. The difference is that in the bulb is an electronic thermister.