Honeywell Aquastats, also known as Honeywell Aquatrol Outdoor Temperature Compensators, are designed to automatically regulate supply or loop water temperature to provide outdoor reset function. Honeywell Aquastats are available in various models, which allow to control boiler temperature, floating control mixing or injection valves, as well as circulators for injection mixing purposes. All Honeywell Aquastat models come with an automatic reset curve calculation, selectable Warm Weather Shut Down, push-to-test button, and trouble shooting LED features.
Aquastat models listed in this category are single contact temperature and for well mount, remote mount and strap-on radiant/hydronic applications. Switch configurations include: Single SPST NO and NC, SPDT.
What is a Honeywell Aquastat?
An aquastat is a temperature controlling device used primarily in hydronic heating systems, and are designed to prevent the boiler from firing too often. Honeywell aquastats have a high and low limit temperature, allowing for enhanced safety and assuring uninterrupted system performance. Some aquastat models also have a differential control which determines the size of the range around the hi and low limit values.
If a thermostat calls for heat, the boiler will fire until the high limit is reached, then shut off (whether or not the thermostat is still calling for heat). The boiler will fire again if the system water temperature drops below a range around the high limit. The boiler will also fire when the system water temperature goes below a range around the low limit, thus ensuring that the system water temperature stays above a certain point (again, regardless of thermostat state).