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An aquastat is a device used in hydronic heating systems for controlling water temperature. [ 1 ] [ 2 ] To prevent the boiler from firing too frequently, aquastats have a high limit temperature and a low limit.
Communication is digital and bi-directional between the controller (primary) and the boiler (secondary). Various commands and kinds of information can be transferred; however, the most basic command is to set the boiler's target water temperature. OpenTherm makes use of a traditional untwisted 2-wire cable between controller and boiler.
Digital freeze stats, also known as electronic or solid state freeze stats, use an electronic circuit, microprocessor, or microcontroller in place of the mechanical freeze stat's diaphragm and switch. They also use one or more electric or electronic sensors in place of the capillary tube and bulb for temperature sensing.
The program features include time schedules, set points, controllers, logic, timers, trend logs, and alarms. The unit controllers typically have analog and digital inputs that allow measurement of the variable (temperature, humidity, or pressure) and analog and digital outputs for control of the transport medium (hot/cold water and/or steam ...
A digital thermostat Honeywell's "The Round" model T87 thermostat, one of which is in the collection of the Smithsonian. A touch screen thermostat An electronic thermostat in a retail store A thermostat is a regulating device component which senses the temperature of a physical system and performs actions so that the system's temperature is ...
While combination boilers have more moving parts and are thus widely held to be less reliable than tank systems, [4] the twin trends towards replacement of parts based on a pre-set design life and replaceable digital controls for 'traditional' systems has largely eroded this distinction.
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