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The NEC and HVAC Chapter Two

The National Electrical Code (NEC) and HVAC: The Basics

The NEC and HVAC Chapter Two

The NEC and HVAC Chapter Two – Chapter Two of the National Electrical Code (NEC) covers Wiring and Protection and starts at Branch Circuits, Feeder circuits, GFCI requirements and protection,. An HVAC installer may want to pay attention to branch circuit requirements. Article 220 in Chapter two of the NEC includes calculations for branch and feeder circuits including service calculations. (Table 220.3)

  • Specific branch circuit requirements for HVAC can also be found in Chapter 4 Article 440 – Air Conditioning and Refrigerating Equipment Branch Circuit Conductor Sizing
  • Article 424 – Fixed Electric Space Heating Equipment Branch Sizing
  • An entire chapter on motors including feeder circuits for motors

Chapter Two of the NEC also covers basic lighting which by code is done by Volt-Amperes per square foot. (Table 220.12)

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DDC Automated Logic M-Stack | HVAC Control

DDC - Automated Logic M-Stack - HVAC Control

DDC Automated Logic M-Stack

DDC Automated Logic M-Stack – This Automated Logic M-Stack provides control for multiple pieces of HVAC equipment and integrates network communication all in one single stack. This direct digital control system is integrated with pnuematic controls. DDC allows automated HVAC control processes to take place and adds higher efficiency to an HVAC system.

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Home Inspector HVAC Training | Heating and Cooling

Home Inspector HVAC Training

Mechanical Code Book

Home Inspector HVAC Training

Thank you!! I am training to become a home inspector and the info contained on this site is helpful in identifying issues that require a HVAC professional to resolve. Read more…….

You’re welcome! I understand that everything at High performance HVAC is limited and there is so much more to learn about and for me to write about when I get the time for it. Don’t limit yourself to just what is contained on High Performance HVAC as there is so much more to learn as far as HVAC training and learning air conditioning and heating systems. Additionally, some of that knowledge you learn will come with experience so even after studying air conditioning and heating and other areas of home inspecting there is more to learn in the future that only comes with time and experience.

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Thermostat Selection and Types | HVAC Control

Thermostat Selection and Types

This article will help select the right type thermostat for the HVAC system you have installed.

Thermostat Selection and Types – So you have made a choice to replace the thermostat in your home or business and you decided to do it yourself.Thermostat Selection and Types Hopefully you will follow the advice on this website and read the instructions before replacing the thermostat. It is recommended if you do not know what you are doing or having any doubt what-so-ever then please consult a professional. One of the biggest issues with replacing your thermostat is selecting the proper thermostat. This will depend on the air conditioning and heating system which you have installed in your home. By and large most thermostats are low voltage thermostats however there are line voltage thermostats, Millivolt thermostats, and other proprietary solid state thermostats that come with many mini-split or ductless systems. Other selection factors include selecting a programmable thermostat, non-programmable thermostat, and digital or mechanical thermostat. You need to first figure what kind of air conditioning and heating equipment you have before selecting the proper thermostat. In some cases selecting the proper thermostat will require some technical knowledge concerning low voltage thermostat circuits.

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VAV Air Handler | HVAC Zoning

 VAV Air Handler | HVAC Zoning

VAV Air Handler and HVAC ZoningVAV Air Handlers are ideal for providing zones in a commercial building. Office space typically has several offices and open areas that need to be conditioned for the comfort of the people working in those areas or offices. By installing VAV boxes and zoning the duct work from those VAV boxes these areas and offices can be kept comfortable using a VAV air handler system. Each box can have its own thermostat and that area or office served by that particular VAV box can be maintained and conditioned for the people working in that space. The VAV box will receive its conditioned air from an air handler through a primary duct that feeds air to the VAV box. The VAV box then determines the amount of air to the secondary duct by a damper located in the VAV box. Depending on what the thermostat temperature set point is and the temperature in the space will determine the amount of air flow the space will receive from the VAV box. Additionally, A box with reheat will energize the heat strips or open the actuator for the hot water coil if the set point and room temperatures calls for the reheat to provide heat to the space (If the VAV box is equipped with reheat).

To learn more see our article on How VAV Boxes Work

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TUESDAY, July 07, 2015


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HVAC Tips: Helping You Learn

Ceiling Fans Save Energy: Ceiling fans installed strategically in your home or business can save you in air conditioning energy costs in the summer. The draft effect from the fan will allow you to raise the thermostat setting by up to 4 degrees and still remain comfortable. Make sure you purchase ceiling fans with energy efficient motors and blade designs. Some ceiling fans have inefficient motors and bad blade designs that will reduce the energy savings you can realize. A qualified electrician can install ceiling fans in your home or business and you can enjoy the savings and compliment your HVAC system.

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