A gas furnace is a very useful and important appliance especially for people living in cold places. Gas furnace or a home furnace is one that converts gas to heat and is used to keep the indoor air comfortable and warm for living conditions. As an eco friendly option to preserve natural resources like oil, coal and wood to heat homes, natural gas is used more commonly. Some furnaces work at 95% efficiency which only means that your energy consumption and costs will be low.
Before understanding how a gas furnace works, you should take some time to learn about the parts of a furnace. A home furnace is divided into three parts. The first part comprises of the burner, heat exchanger, vent and draft inducer. The second includes safety devices and controls. The third includes the blower and air movement. All these parts work together to keep the furnace working efficiently.
The gas manifold is responsible for connecting the main burners with the gas valve. Brass fitting, termed as spuds connect the burners to the manifold. Generally, the gas manifold is easy to maintain. However, they should not be exposed to the elements.
The gas burners are ignited by an electronic ignition or a pilot flame that is incorporated in most of the latest gas furnaces. They key role of the gas burner is to heat up cold air with the help of heat exchangers that are made of stainless steel. The ductwork and blower motor then distribute this warm air all over your house.
It is made of heavy gauge metal mixed with alloys that resist temperatures above 2000° F. The high temperature inside the heat exchanger makes the annual inspections essential. With repeated use, cracks develop in the heat exchangers and harmful gas like carbon monoxide may leak in the air inside your home.
Vents are generally made of PVC or stainless steel. PVC is a more common choice because of its higher durability and low cost. The vent pipe, as name suggests is responsible for sending out the exhaust gasses formed due to the combustion. The standard venting that is suggested for gas furnace is type B gas vent pipes.
Integrated circuit boards are used to monitor the operation of the furnace. In case of malfunctioning furnace the light emitting diodes start showing failure codes. These codes are generally listed on the owner’s manual and the body of the furnace.
The thermocouple is a safety control device. In case the pilot light goes out or ignitor fails, the thermostat shuts off gas. The thermocouple has two metal wires. Upon heating up, the thermocouple signals the valve by means of a solenoid, which is operated by a volt transformer. The thermocouple converts heat into an electrical signal that controls the working of the valve.
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