by High Performance HVAC | Gas Furnaces |
Honeywell Temperature Fan Limit Switch Control – The fan limit control turns the fan on and off in furnace applications. It works off of temperature and also provides a high-temperature safety limit. This is a switch, actually two switches, which turns the furnace blower on and off based on the temperature of the heat exchanger.
A helical bi-metal probe extends from the back of the fan limit control. This probe is located inside the heat exchanger and the bi-metal of the probe reacts to temperature.
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by High Performance HVAC | Gas Furnaces |
Gas Furnace AFUE Definition | HVAC Terminology. AFUE or Annual Fuel Utilization Efficiency Heating systems consume approximately 35% to 50% of a typical home’s energy budget. Therefore the government has come up with a way to measure efficiency ratings of furnaces so they can set a standard for minimum efficiencies.
The definition of AFUE is – Annual Fuel Utilization Efficiency. AFUE is a rating that reflects how efficiently a gas furnace converts fuel to energy. A gas furnace with an AFUE of 95 means that approximately 95 percent of the fuel is utilized to provide warmth to your home, while the remaining 10 percent flows up the flue and into the atmosphere.
Therefore you are actually using 95% of the fuel you are paying for and the other 5% is being wasted up the flue vent.
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by High Performance HVAC | Gas Furnaces |
High-Efficiency Electronic Ignition Gas Furnaces are here. They are the next step up from the standing pilot gas furnace. These gas furnaces are more efficient than the standing pilot furnaces but more complex in design. There are three types of electronic ignition gas furnaces: the intermittent spark pilot, the intermittent hot surface ignition pilot (Honeywell Smartvalve and ignition assembly), and the hot surface ignition furnaces.
While the three are different they all offer higher efficiencies and are both controlled by solid-state circuit boards. Many of these furnaces also have higher efficient heat exchangers.
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by High Performance HVAC | Commercial HVAC |
Air Source Chillers provide cool water for a hydronic piping system
How Hydronics Works | HVAC Technical for Consumers - Hydronics refers to using water and chilled water, steam boilers and hot water boilers, and other methods of transferring heat using water.
A boiler or chiller is used to heat or cool the water and then the water is transferred through the hydronic piping loops to heat exchangers such as coils or baseboards where heat is transferred from the water to the air for heating and from the air to the water for cooling to provide comfort for people or a process.
Hydronics is very popular in commercial and industrial HVAC applications for heating and cooling occupants in large buildings and providing heating and cooling for equipment and machines including computers and servers. Basically in a nutshell Hydronics uses water to move heat from one place to another.
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by High Performance HVAC | Air Conditioning |
Home Ventilation and Pressure - It is becoming increasingly necessary to have your home checked for home pressurization. Does your home have negative pressure inside of it? Do you have a gas or oil furnace which is inside the home and uses the air in the home for combustion air to fire the furnace or boiler?
Do you have other gas or oil-burning appliances, a fireplace, gas logs, or anything which consumes air inside the home? This does not refer to furnaces that are located in the attic (unless you have a completely sealed attic or the attic has a maximum height of fewer than 30 inches.)
Home Ventilation and Pressure | Appliances and Air Content
These appliances consume air and along with some other air-consuming appliances in your home, the issue of home pressure and home ventilation comes into question especially in this day and age when the drive is on to increase efficiency and reduce energy consumption.
Homes are being built tighter with better insulation, doors, and windows. Less infiltration air is being fed into the modern homes of today so it’s important to give the home a safety check to make sure there is enough air left over for the occupants of the home.
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by High Performance HVAC | Gas Furnaces |
Electronic Control Board for an Electronic Ignition Gas Furnace
Gas Furnace Ignition Control Operation | HVAC Heating. This furnace control board controls much of the functions of this gas furnace with few exceptions. The main control comes from the thermostat and once the thermostat tells the gas furnace control board it is time for the heat to come on the gas furnace control board takes over from there except when the thermostat is satisfied the system shuts down.
On a call for heat from the thermostat the gas furnace control board starts its sequence of operation. This article relates to the sequence of operations for electronic ignition gas furnaces. Some furnaces will vary in their sequence of operation from what is written here. However, most electronic ignition gas furnaces use this sequence of operations. For the sequence of operation for a standing pilot gas furnace see this article.
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by High Performance HVAC | Gas Furnaces |
Gas Furnace Components 2 - Gas Burners - Depending on the type of gas furnace and how the gas furnace was engineered will depend on the type of gas burners. Inshot burners generally shoot a flame into the combustion chamber where an induced draft exists. For sealed combustion chambers a forced or induced draft will exist.
There are burners with precisely drilled holes in them. Then there are slotted gas burners that extend into the combustion chamber and generally have induced draft combustion chambers. However, these can also have forced draft combustion chambers if the combustion chamber is sealed. The size of these holes and slots in gas burners will also depend on the altitude and capacity of the furnace. (more…)
by High Performance HVAC | Heat Pumps |
Heat Pump Problems | HVAC Heating & Cooling - Heat Pumps are very popular especially in the South where air source heat pumps are mostly favored over straight air conditioners with a gas furnace for heating. 
With a heat pump, one system can provide heating and cooling. Some people rely on a geothermal heat pump system or a water source heat pump. A geothermal heat pump extracts heat from the ground instead of the air like an air source heat pump works. (more…)
by High Performance HVAC | Gas Furnaces |
Gas Furnace Maintenance Agreements - In the commercial environment maintenance is a never-ending cycle from winter to summer. In contrast, in the residential environment sometimes maintenance is neglected. Neglected until there is a problem with either the heating or cooling system.
Why wait for something to happen when there some simple things you can do to make sure your heating and cooling run at optimum levels. Are gas furnace maintenance agreements worth it?
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by High Performance HVAC | Gas Furnaces |
Gas Furnace Facts - Gas Furnaces are the most used types of the heating appliance for our homes and businesses and modern gas furnaces range in efficiency ratings from 79% to 98%. Gas furnaces can either use propane or natural gas for fuel. That largely depends on whether natural gas is available at the location of the appliance.
Propane is used in rural areas and in urban areas where the natural gas pipeline infrastructure is not available. Natural gas is delivered via pipeline, while propane is delivered via trucks and pumped into tanks. Tanks locations are on the premises near the gas furnace. The gas furnace that utilizes the propane for fuel needs a fuel supply. Therefore, the proximity of the tank.
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