The purpose is what it was without a HVAC system ... to make heat !
To condense
A double boiler is usually used to melt choclate. You can make one yourself by using two pots and boiling water.
An industrial boiler heats up the whole building and provides a lot more heat than a standard boiler it is designed to be used in places like power stations.
limit switch on hvac used to cut off low voltage on heating when system over heat limit
It's used to remove air and gasses from a boiler system.
Economizers (US), or economizers(UK/international), are mechanical devices intended to reduce energy consumption, or to perform another useful function such as preheating a fluid. The term economizer is used for other purposes as well. Boiler, power plant, and heating, ventilating, and air-conditioning (HVAC) uses are discussed in this article. In simple terms, an economizer is a heat exchanger.
Stop Boiler Valve (or Crown Valve) is installed on an outlet line of a boiler. It's purpose is isolation of a boiler from a downstream steam line. Its position may be either open or close, it cannot be used for throttling of steam.
Plenum
vaporizer hvac. and tandom system ac
It is used to separate the moisture and unwanted pacticles form the oil.
There is a chemical called Carbohydrazide which is used in boiler water. Carbohydrazide is a volatile oxygen scavenger, contributes no solids to the system, reacts readily with oxygen at low temperatures and pressures, and passivates the metal of the boiler system. Carbohydrazide cannot be used in applications where the steam comes into contact with food.
One function: to safely heat water. Whatever the resulting hot water or steam is used for is not a function of the boiler, but the system it is connected to.