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 | Commercial HVAC |
Rooftop Air Handler with Heat Recovery - This large rooftop air handling unit also has a heat recovery wheel integrated inside the AHU itself. The all-in-one AHU and heat recovery unit saves energy by recovering heat. The heat would otherwise be vented outside in the wintertime. Additionally, in the summer it removes heat from the air that is used for economizer and minimum outside air. (more…)
by High Performance HVAC | Commercial HVAC |
Computer Room Air Conditioner Units - also referred to as CRAC units are essential inside data centers where cooling is necessary for all the computer and electrical equipment most data centers utilize. It is important to keep the equipment cool to prevent overheating for some equipment. (more…)
by High Performance HVAC | Commercial HVAC |
How Cooling Towers Work - Cooling towers use evaporation cooling to cool condenser water from a chiller. Water is pumped to the top of the cooling tower, where the water flows down some flow plates to the cooling tower basin. As the water is flowing down the flow plates air is pulled through the plates and over the water where it releases heat through evaporation. (more…)
by High Performance HVAC | Thermostats |
The Mercury Switch Thermostat | HVAC Control - Mercury switch thermostats are not available for purchase in many states. They have been banned because they contain mercury, and it is important to properly dispose of these thermostats that contain mercury if they are changed out for newer digital thermostats. Some many homes and businesses still have these thermostats in use so we will offer a brief of how these thermostats work including the components inside the thermostat. (more…)
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 | Commercial HVAC |
Plate Heat Exchanger and Free Cooling - This plate heat exchanger is used in a data center for a chilled water system and is a chilled water economizer. Heat exchangers are used in marine applications, industrial processes including chemical processing systems, food processing, and many HVAC applications including chilled water applications, hot water applications, and economizer applications. (more…)
by High Performance HVAC | Water Heaters |
Hot Water Heaters - Domestic hot water heaters make our lives much more comfortable than ever before. Hot water heaters give us hot water for washing our hands, showering, washing dishes, and other uses that would otherwise be uncomfortable without a hot water heater.
When considering hot water heaters beyond the cost of the water things to consider are the size of the hot water heater and the type of fuel it will use to heat the water. (more…)
by High Performance HVAC | Gas Furnaces |
To Troubleshoot a Goodman Gas Pack one should understand sequence of operation for gas packs
Gas Furnaces Sequence of Operation – Why is furnace sequence of operation important? If a technician is to properly troubleshoot a gas furnace he needs to know the proper sequence of operation for the particular furnace he is troubleshooting. (more…)
by High Performance HVAC | Gas Furnaces |
Gas Fired Pool Heater
Gas Furnace Types come in a variety of sizes and can be used for different applications. Types of gas furnaces have different classifications. By and large, the most common gas furnaces use natural gas and utilize electronic ignition. Electronic ignition gas furnaces are slowly replacing the older style standing pilot furnaces where a pilot light remained lit all the time.
Now, with the newer modern electronic ignition, gas furnaces only use gas when there is an actual call for heat. That adds efficiency because, with the older standing pilot gas furnace, the pilot remained on even in the summer months. The heat produced by a standing pilot light is negligible. However, it is still added heat to the system in the summer.
The whole purpose of the AC in the summer is to remove the heat from the system. Rather than add heat like a standing pilot would do.
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