What is an aquastat

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

Our team is growing! View current openings and apply today. Read More. You are seeing this message because we have detected you are using Internet Explorer 10 or older to browse our site. 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. Furnaces have been around for a very long time, and have been one of the most popular heating systems available for most of that time. This has led homeowners to gain at least a little bit of basic knowledge about the various parts of the furnace and their roles.

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.

Hidden categories: Articles needing additional references from February All articles needing additional references All stub articles. As you turn one on, you turn the other off, and vice versa.

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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.

What is an aquastat

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Click Here to see thermostat wiring instructions, or view m When the temperature rises to the setpoint, the switch closes makes to turn on the circulator. That may happen because the aquastat that comes with the boiler has a part number unique to that boiler manufacturer. An aquastat is similar to the furnace limit switch in operation, maintaining a safe operating temperature for the central heating unit. 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. This keeps the water hot, but below boiling temperature. When the temperature rises to the thermostat setpoint, the switch inside the thermostat "makes" contact and turns on the cooling. An aquastat is a device used in hydronic heating systems for controlling water temperature. Perhaps you can't find a direct replacement because the part number on the old aquastat doesn't match anything available at the parts distributor. In hydronic heating we use both - the aquastat to control boiler water temperature, and the thermostat to control room temperature.

This article series explains how aquastats work and what the different aquastat controls are, what they do, and how they are set. We explain the location and use of the heating boiler reset button found on aquastats. InspectAPedia tolerates no conflicts of interest.

Triple aquastat relays are an aquastat, a relay and a transformer all in one box. Click Here to see thermostat wiring instructions, or view m Read More. Capillary Length: If the bulb is remote, the capillary tube has to be long enough to get to the controller. An aquastat is just a switch that turns the boiler on and off to maintain the right water temperature. SPDT - The switching action of a few aquastats allows you to control two things at once. It's likely that a trade, or generic, replacement will work. This means that much of their inner workings are not common knowledge quite yet. Encyclopedia of building and construction terms. Skip to Content. There seems to be confusion about exactly what an aquastat does, and especially about finding a replacement aquastat when one fails. The low temperature limit is meant to keep the water supply temperature from dropping too low. A remote bulb has a capillary tube several feet long so that the bulb and the controller can be apart.