by High Performance HVAC | Air Handlers |
Air Handler Evaporator Condensation Drain Blower Compartment
This air handler has the access panels removed during the installation process so the HVAC installation technician can make the final connections and adjustments. In clear view is the air handler blower compartment with the air handler blower. The air handler blower is comprised of an electric motor, a blower wheel, and a squirrel cage which holds it all together. Attached to the outside of the squirrel cage is a run capacitor which is a functioning part of the electric motor. All these air handler components combined blows air throughout the entire HVAC system including the evaporator coil. (more…)
by High Performance HVAC | Boilers |
Outside All Weather Boiler - Outside all-weather boilers are used in circumstances where it is not possible to install the boiler inside a mechanical room or anywhere in the building. There some considerations one needs to take into account about having an outdoor boiler especially if it is for a residential application. (more…)
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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by High Performance HVAC | Gas Furnaces |
How Gas Furnace Thermocouples Work | Boilers and Furnaces. Furnaces, water heaters, and boilers, especially older gas systems use the standing pilot gas system as an integral part of the furnace’s operation. These systems are best recognized as having a standing flame burning continuously.
It is a basic and time-tested system that provides a reliable way of proving a flame. It employs a thermocouple (some systems can use a thermophile which is a lot of thermocouples embedded in one piece) and a gas valve that has two separate valves inside of it.
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by High Performance HVAC | Gas Furnaces |
Gas Furnace Components | HVAC Heating Systems. Different types of gas furnaces are available for purchase today and the older models which were installed many years ago still in operation. The older models were typically atmospheric-type gas furnaces and used a lot of gas to produce heat, much of which went up the flue because efficiencies were low.
The standing pilot atmospheric type gas furnaces still exist today, but they are slowly going the way of the dinosaur as newer more efficient furnaces are replacing them. (more…)
by High Performance HVAC | Direct Digital Controls |
In HVAC a variable speed drive is a speed control system for electric motors. The variable speed drive (VSD) or variable frequency drive (VFD), among other names (adjustable-frequency drives (AFD), AC drives, micro-drives, or inverter drives). The application of variable speed drives has brought about a new way of engineering buildings and control systems HVAC.
The flow of water and air can now be regulated precisely using VSD’s and state-of-the-art control systems. By combining VSD’s with state-of-the-art control systems, large savings in energy usage can see realization because the exact quantity of flow of water or air can be delivered to satisfy demand.
Demand-based control is energy efficient. VSD’s can be stand-alone or controlled by a building automation system.
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by High Performance HVAC | Direct Digital Controls |
DDC Programming Logic 3 - DDC control logic blocks have practically an unlimited way of arranging the blocks for HVAC control. Below is an example of a line of logic blocks arranged for static pressure control of a VAV air handler supply fan using a variable frequency drive. This same arrangement could also be used for static pressure control using a bypass damper instead of a VFD. (more…)
by High Performance HVAC | Direct Digital Controls |
Programming DDC Logic 2 - Analog Network Input
Programming DDC Logic 2 - The analog network input is similar to an analog input except this input is not hardwired to the local controller but on a remote controller in the network. It is very important that the communication works effectively for this analog network input to work. An example of this is the outside air temperature which is hardwired to a DDC controller in the penthouse of a multistory building.
The building engineer only wants the boilers to fire if the outside air temperature is less than 55° F. Instead of having an outside air temperature device hardwired to the boiler controller an analog network input can be placed into the boiler controller program and linked to the outside air temperature reading which is in the penthouse controller where the outside air temperature thermistor is hardwired. This saves devices and wires necessary for optimum control.
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by High Performance HVAC | Air Handlers |
Air Handler Components. This article will take different types of air handlers and disassemble them part by part. This will give you a good description of each part and hopefully a better understanding of the air handler. Most of the components associated with the air handler are in the air handler. However, there are a few components which are not in the air handler but associated with the air handler.
There are some hot water and cold water coils which are not fixed in the air handler. They are downstream in the ductwork. There are also some gas and electric duct heaters which are mounted in the ductwork. They are completely reliant on the air handler for air flow. These systems will also be covered. Hopefully, this article will offer you a comprehensive look at the air handler, all its parts, and how it functions. (more…)
by High Performance HVAC | Boilers |
HVAC Near Boiler Piping Components - HVAC near boiler piping is very important to a good hot boiler loop circulation of the water. Hot water loop piping is key to maintaining good water flow throughout the system. The placement of valves, the circulator pump, and other loop controls are generally installed near the boiler. (more…)
