What is an aquastat

It's no mystery that an aquastat is a control that goes with a boiler. If you don't know much more about it than that, though, you have a lot of company. There seems to be confusion about exactly what an aquastat does, and especially about finding a replacement aquastat when one fails, what is an aquastat.

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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.

When the temperature rises to the thermostat setpoint, the switch inside the thermostat "makes" contact and turns on the cooling. There are two settings in every aquastat, a high setting and a low setting.

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An aquastat relay is a combination of three controls. As its name suggests, it's an aquastat, a relay and a transformer. All three components are mounted together in what looks like a gray painted brick, with a skinny copper cigar hanging out of the back on a very thin copper tube. The cigar is the temperature-sensing element of the aquastat. The purpose of the aquastat relay is to provide a place for most of the controls in a boiler system to be wired together. These are called terminal screws. The label tells you what to wire in there. For example, the T-T terminals are where you'd connect the two wires from the thermostat. The C terminals are for the circulator.

What is an aquastat

An aquastat relay is a combination of three controls. As its name suggests, it's an aquastat, a relay and a transformer. All three components are mounted together in what looks like a gray painted brick, with a skinny copper cigar hanging out of the back on a very thin copper tube. The cigar is the temperature-sensing element of the aquastat. The purpose of the aquastat relay is to provide a place for most of the controls in a boiler system to be wired together. These are called terminal screws. The label tells you what to wire in there. For example, the T-T terminals are where you'd connect the two wires from the thermostat.

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Bulb Type There are only three bulb types: An immersion bulb is placed directly into the boiler water. Contents move to sidebar hide. Categories : Heating, ventilation, and air conditioning Plumbing Technology stubs. As you turn one on, you turn the other off, and vice versa. Your Browser Is Incompatible You are seeing this message because we have detected you are using Internet Explorer 10 or older to browse our site. A gray sticky substance called conductive compound is often put in the well along with the bulb to assure heat transfer. There are two settings in every aquastat, a high setting and a low setting. It's often put in a metal sleeve called a well. Carol Fey Published on July 16, Comments. Encyclopedia of building and construction terms. No, you can't stretch it. For this reason, the aquastat shuts off the boiler when it reaches the high temperature limit.

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Download as PDF Printable version. An aquastat is a device used in hydronic heating systems for controlling water temperature. High limit, low limit and circulator control are all separate functions of single-function aquastats. An aquastat is a device installed in hydronic water systems for the purpose of controlling temperature within the boiler. This keeps the water hot, but below boiling temperature. In the summer, the thermostat "makes" on temperature rise. Check out her books and classes. This article needs additional citations for verification. Hold onto your plumber hats - we'll look at these one at a time. For other uses, see Aquastat disambiguation. This technology-related article is a stub.