Condensing Unit Reviews Category Index
Plate Heat Exchanger and Free Cooling
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...
Natural Gas Burners and Burner Tubes
Natural Gas Burners and Burner Tubes - These natural gas burners control the gas as it enters the gas burner tubes. The gas burner tubes have little holes which control the amount of gas that exits the top of the gas burner tubes. The black pipe running out of the gas...
Gas Furnace Maintenance Agreements
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...
Direct Digital Controls DDC | HVAC Control
Direct Digital Controls DDC or DDC Systems offer a high level of control for building mechanical and electrical systems. Additionally, the modern state-of-the-art direct digital controls have the ability to offers trends of data points of HVAC/Electrical equipment....
DDC Programming Logic Symbols 1 | HVAC Control
DDC Programming Logic Symbols 1 - DDC programming in HVAC Control can be rather complex especially to those who don’t understand software or programming. Some software and hardware manufacturers utilize symbols to build their logic programs for HVAC DDC control. Some...
Geothermal Heat Pumps | HVAC Heating & Cooling
Geothermal heat pumps use groundwater or water circulated through pipes to exchange heat with the earth. Geothermal versus air-source heat pump systems use the earth's natural temperature to exchange heat and provide heating and cooling. The temperature of the air...
Air Handler Evaporator Condensation Drain Blower Compartment
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...
Outside All Weather Boiler | HVAC Heating
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...
Gas Furnace Facts
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...
How Gas Furnace Thermocouples Work | HVAC Heating
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...
Gas Furnace Components | HVAC Heating Systems
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...
Variable Speed Drives | HVAC Control
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...
HVAC Control DDC Programming Logic 3
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...
HVAC Control Programming DDC Logic 2
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...
Air Handler Components
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...
HVAC Near Boiler Piping Components
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...
Hot Water Boilers – HVAC Hydronic Heating
Hot Water Boilers - HVAC Hydronic Heating - People who use boilers for their primary source of heat report that they love the kind of heat that a boiler provides, whether they have a hot water steam boiler. If you thought that there is only one type of heat, you might...
Duct Temperature Sensor
Duct Temperature Sensor - The duct static temperature sensor measures air temperature in the ductwork. The solid-state temperature sensing devices are commonly used in HVAC applications that are controlled by direct digital control or a modern building automation...
Hot 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....
Oil Controls Burner
Oil Controls Burner - The oil burner and oil controls provide the main source of heat for this oil furnace. The oil burner comprises an oil pump, an oil pump, a burner electric motor, a burner blower, a step-up transformer, an oil ignition control, an oil burner gun,...
Flue Condensation Problems
This picture shows furnace flue condensation problems. This problem is caused by hot gases cooling too quickly in the flue. As the hot gasses cool, the moisture in the gases condenses and starts dripping back down the flue. Typically, there is a combustion issue or...
Air Handler Filter Pressure Sensor
Air Handler Filter Pressure Sensor - This is a pressure sensor. It tells a maintenance technician if the air filters are dirty and clogged. The pressure control is a low static pressure switch to trip the unit if the mixing box drops below the setpoint pressure. The...
Water Dripping from Air Conditioner | Condensation Drain Pipe
Water Dripping from Air Conditioner - We have 2 air conditioning units in our house and 2 pipes protrude from the roof. One of the pipes is dripping water. We were told to look for a blockage and to empty the pans. I don’t see where to check for a blockage. Any...
HVAC Duct Work – Air Handling Unit Duct
HVAC Duct Work delivers the conditioned air to the spaces. The Air Handling Duct channels this conditioned air to spaces where it is needed and then a return duct channels the air back to the air handling unit duct for re-conditioning. The return ductwork has a...
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