Gas furnaces are basically heating appliances that use gas as their energy source. How do gas furnaces work? Now before you can buy a gas furnace, you ought to understand how it really works so that it’s easy to handle and maybe know how to rectify it in case there is a simple problem.
Unlike other furnaces which generate heat and distribute it to the parts of the room either by electricity, burning coal, oil, or propane gas, this one burns natural gas to generate the heat. The way it is structured is usually very different from all the others.
What Is a Gas Furnace Made Up of?
The first step in understanding how a gas furnace works is usually understanding its parts. Now a gas furnace has different parts which have different purposes and they include the following;
The burners are the main parts of the gas furnace. They are basically small gas outlets whose work is to let out controlled amounts of gas to be ignited within the furnace in order to produce heat.
These are small devices that work through emitting sparks to ignite the gas that comes out of the burners to produce heat. Their main job is to produce a spark to ignite the gas which burns inside the furnace.
A small device inside the furnace that is there to control build gases if there is no flame. For safety purposes, if the gas comes out and there is no flame detected, the gas is automatically shut off so that it does not build up dangerously.
This is a device that controls the heating cycle. It does this by measuring and controlling the heat supply in the room.
This is a purely electric appliance that receives and works according to electrical signals generated from the air supply system and temperature from the furnace. This controls everything in the system and controls all the operations.
The heat exchanger controls the heat generation and transfer between the inside and outside of the furnace. They are basically tubes that separate the air being heated from the one being supplied.
This has a simple function of regulation. Where it regulates the flow of gas from the source.
This is the part that regulates the flow of electricity into the furnace. The function of this is to basically regulate the electric current to the correct voltage.
The Heating Cycle
The heat cycle is the system of heat generation and circulation within and around the furnace to produce hot air that is directed to parts of your house to make the temperature bearable and suitable for staying.
It all begins from the pipe that supplies either propane or natural gas to your house. The gas is directed to your furnace through the inlet pipe. The igniter sparks which starts a small flame inside the furnace. This flame is responsible for heat production. Now, cold air enters the furnace where it is warmed up by the heat exchanger.
The vent then channels out the exhaust gases from the combustion process. The blower fan will then direct the warm air to various parts of the house. The blower fan depends on the thermostat to supply varying amounts of heat into the room.
Once the top temperature has been hit, the flow of gas is inhibited to prevent the burning of more gases. This goes on and on to control the air temperature around the room.
All these parts work together for the heating cycle to be achieved. When any of them gets faulty, the whole system might fail to work. You, therefore, need to do the necessary maintenance routines and cleaning the parts that get dirty to maintain the flow of warm air in the room.
How do Gas Furnaces Work – The Air Regulation System
The heat that comes from the burner inside the furnace is usually regulated through the blower fan and the thermostat. The thermostat measures the air around the house to dictate whether more or less warm air should be emitted to the surrounding.
The air that is contaminated from burning gas inside the furnace is then directed and emitted to the outside. The air inside and within the heating system is usually regulated to make sure there is balance.
The gas furnace usually works. By supplying hot air into the room through the blower fun and returning the cold air to be haeted through the return ducts, creating a constant exchange of cold and warm air between the inside and outside of the furnace.
The heat generated is actually forced out of the unit by the blower fan. Any contaminants in the air are trapped by the air filter. The constant supply and exchange of the gases are what creates the regulating effect that makes the temperature bearable in the house.
The Electric System
The electric system of the gas furnace mainly contains the transformer, the control board, and the igniters. Each one of them has its purposes, but they share the same power line. The igniter generates a spark to ignite the gases when the system is turned on.
The control board controls entirely every single activity within the whole unit and the transformer regulates the voltage of the electric power coming into the unit. The electric system is part of the mechanism of controlling the flow and exchange of air inside and outside the furnace.
How Do Gas Furnaces Work – Conclusion
The gas furnace mainly composes of different parts which work together to control the temperature inside the house. The air regulation system is the main one but it all depends on the burning of natural gas or LPG to produce the heat which heats up the air and warms up the room.
It is usually important to know the parts, how they function and what you need to do with any of them in order for the system to work. Every part of the system should be working for the air to be regulated inside the house.
How do gas furnaces work? The question is well answered when you get to understand each detail of the whole system like we have just done. Knowing it is important to know what to do in case one part breaks down.