From air conditioner air conditioner electric motor capacitors to refrigeration system evacuation this page will help an HVAC technician understand HVAC air conditioning and heating systems better.

Hot Water Boiler Technical Articles

Boiler Expansion Tanks - goes in depth for technical information about baldder type expansion tanks and steel expansion tanks. Explains the purpose of the expansion tank in a hot water boiler system, proper fill levels and pressures for expansions along with proper locations of expansion tanks in the hot water boiler system. Briefly covers air management and air control and how the expansion tanks affects air management and control in the hot water boiler loop system.

Hydronic Loops - the Hydronic Loops article has descriptions and graphics of various types of hydronic loop systems used today from one pipe series and monoflow, to tow pipe direct return and reverse return loops. The Hydronic Loops article also lists the advantages and disadvantages of the various types of loops and piping arrangements along with zoning information.

Hydronic Pipe Sizing - Hydronic Pipe Sizing has charts for pipe sizing and offers formulas used in pipe sizing for hydronic loops.

Boiler Maintenance - covers some information about boiler maintenance and boiler maintenance code. Boiler maintenance code is for safety and expalins the importance of knowing the code and having a good boiler preventive maintenance program for safety and reliability of the boiler system.

HVAC Technical Electrical and HVAC Controls Articles

GE ECM Electronically Commutated Motor for HVAC Blowers - GE Electronically Commutated Motors or ECM blower motors offer you a higher efficiency and more control that equates to comfort.

Electric Motor Capacitors - Capacitors are used in HVAC on many different types of motors from condenser fan motors, compressors, blower motors, and pumps. Learn the difference between a motor start capacitor and a run capacitor.

Troubleshooting Thermostats - basic thermostat troubleshooting for digital and programmable thermostats.

Air Conditioner to Heat Pump Conversion? - this article was written mainly because I get many emails (too many) from people who ask this question. It is a description of what it would take to convert the air conditioner to a heat pump.

HVAC Technical Refrigeration Articles

HVAC Refrigeration System Evacuation - How many HVAC technicians know how to properly perform a refrigeration system evacuation? Now, after reading this HVAC Refrigeration System Evacuation article how many HVAC technicians have been properly performing the refrigeration evaction the proper way? Be honest now!

Pressure Temperature Chart for R-22, R-410A, and R-134A - The PT Chart or Pressure Temperature Chart is your guide for properly charging HVAC systems.

HVAC Pipe Soldering and Brazing - The bread trick and other helpful tips along with temperatures and the technical side of brazing and soldering.

Refrigerant Leaks - The most common parts the HVAC systems which spring refrigerant leaks and the action to take to repair. Sometimes it is better to replace than repair but this decision rests with the customer.

How Air Conditioners Work

How Air Conditioners Work - A simple overview of how an air conditioner works

All HVAC Technicians are Welcome to Visit and Contribute to our HVAC Forum

HVAC Forum - Our little forum is new and we just completed testing of the database and base code. You are welcome to contribute to the forum whether you are a technician or homeowner your questions and answers will help build a good forum for HVAC professionals and non-professionals.

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