a temperature switch that senses the loop water temperature
a thermostat control that turns the pump on or off based on temperature
A device that senses the temperature of a liquid at some point in a system, and opens or closes electrical contacts based on that temperature and the aquastat's setpoint temperature.
A thermostat submerged in water and used to control the operation of a device.
A thermostat that controls the water temperature in a boiler.
A temperature control mechanism that maintains the boiler temperature within a preset range by regulating the quantity of fuel fed to the combustion cell and hence the amount of heat produced. When the boiler temperature drops below the low-limit setting, the Aquastat signals the BCS to operate in the high fire mode. In this mode, the combustion air fan runs continuously, and the feed auger delivers large quantities of fuel to the combustion cell at frequent intervals (e.g. 10 out of every 20 seconds). When the boiler temperature rises to the upper-limit setting, the Aquastat signals the BCS to switch to the hold fire (or idle) mode. In the hold fire mode, the combustion air fan is shut off, and the feed auger delivers only small quantities of fuel to the combustion cell at relatively long intervals (e.g. 5 out of every 100 seconds). It provides only enough fuel to maintain the fire.
a thermostat that measures the temperature of water and opens or closes a circuit. ASH -- the solid residue of combustion. The chemical composition of an ash depends on the substance burned. Wood ash contains metal carbonates (e.g., potassium carbonate) and oxides formed from metals originally compounded in the wood.