Theory and troubleshooting using short modules packed with images to make learning quick and easy.
Steps in order for furnace commissioning: Set gas pressure to manufacture default Set input of the unit. Change orifices if neededSet gas pressureGet the temperature rise in the manufacturer suggested rangeCombustion analysis test An essential step in commissioning a newly installed gas appliance or even just on routine maintenance for both efficiency and safety includes…
A combustion analyzer measures and gives out results to you based on what's taken place after combustion has happened. Understanding exactly what your combustion analyzer is telling you is arguably one of the most important pieces of information to understand as a technician nowadays. An essential step is running a combustion analysis in commissioning a…
Boyle's Law is a law for an ideal gas. An ideal gas is a perfect gas that follows all the gas laws. Ideal gases are hypothetical. Boyle's Law states that for a fixed amount of an ideal gas at a fixed temperature, P (pressure) and V (volume) are inversely proportional, which means at a fixed…
Combustion is a rapid chemical reaction when oxygen combines with the fuel to produce heat. By modifying any of the three, oxygen, heat, or fuel, you create an imbalance and can produce incomplete combustion. Carbon monoxide (CO) and aldehydes are products of incomplete combustion. Carbon monoxide is the most harmful product of incomplete combustion. It’s…
Gas requires quite a bit of air for proper combustion since the air is made up of mostly nitrogen and only contains about 20% oxygen. For adequate combustion to happen, you require combustion air, excess air, and dilution air when using a draft device. Combustion air is made up of primary and secondary air when…
Natural Gas Natural gas has the chemical formula of CH4. Natural gas, also known as processed natural gas, is a dry gas which means it has all the heavier hydrocarbons removed and stored in underground storage tanks for use. Natural gas has no color, no taste, no odor (your distributor adds mercaptan for safety which…
Combustion is a rapid chemical reaction when oxygen combines with the fuel to produce heat. Lighting a match is combustion. You require three things to produce combustion; heat, fuel, and oxygen. Since the air we breathe is only about 20% oxygen and 80% nitrogen, we end up having to supply much more air to get…
There are three types of heat transfer; conduction, convection, and radiation. Conduction Conduction is the transfer of heat between objects that are in direct contact. Example: A pot on a stove burner. As the pot absorbs heat, heat will transfer through the pot handle to your hand. Convection Convection is when a fluid, such as…
Sensible Heat Sensible heat is the amount of heat, (molecular motion), you can measure with a thermometer. It's the amount of heat you add or remove to a substance that changes a substance temperature but does not change the state of a substance. Latent Heat Latent heat is heat added or removed that will change…
A British Thermal Unit (Btu) is a measurement of heat energy. One Btu is the amount of heat required to raise 1lb of water by 1°F. Btu per hour, or Btuh, is the capacity of a heating system such as a 40,000 Btuh furnace. With air conditioning, you’ll often hear people express the cooling capacity…