So you’ve been told that your AC compressor’s “gone bad.” This will likely lead you to a series of questions. Questions like, how did this...

CFCs Number Cylinder Color Refrig. Name Application R-11 Orange Trichloromonofluoromethane Centrifugal Chillers R-12 White ...

This will cause the  following  symptoms failure of Exoension Valve: Low  evaporator (suction)  pressure ; High evaporator and com...

The Seven Greatest Safety Threats to HVAC Contractors Safety Threats to HVAC Contractors The HVAC industry provides ...

Coefficient of performance . The efficiency of a  refrigerator  or heat pump is given by a parameter called the  coefficient of performance...

Fan Coil Unit  Systems. A  fan coil unit ( FCU ) contains a fan which draws the air in a space into the unit then blows it over a cooling o...

Air Handling unit or AHU is an assembly of air conditioning components (such as fans, cooling coils, filters, humidifiers and dampers) int...

An  Air Handling Unit  ( AHU ) is used to condition and circulate air as part of a heating, ventilating, and air-conditioning system. The b...

Basic Refrigeration Cycle Principles of Refrigeration Liquids absorb heat when changed from liquid to gas Gases give off heat ...

Chiller System Overview Chillers use either a vapor-compression or absorption refrigerant cycle to cool a fluid for heat transfer. Bot...

What does TR mean in air conditioning Originally 1 TR was defined as the rate of heat  transfer required  to make 1 short ton (200...

 Superheat and Subcooling Superheat and subcooling are critical to the refrigeration cycle, but can be tough concepts to visualize. Le...

HVAC Basics Facility maintenance managers, HVAC contractors; HOA board members; estate and high-rise building managers; building and ...