Electronic messages can tell the relevant equipment to turn on or off, increase or decrease temperature, and divert, restrict or shut off air, water, or steam flow. In very large facilities, there may be several parent HVAC control points each controlling several smaller systems. In homes or small buildings, HVAC functionality is typically confined to a single controller station.

 

As a result, the HVAC installer should know how a circuit breaker works so he can make the proper connections for any HVAC equipment being installed. This involves being able to determine the right size wires to run and knowing the appropriate breaker to use. In working with forced air systems, the HVAC installer may be required to identify and install the required sheet metal to use for the duct work. In working on refrigeration systems, part of the HVAC installer’s job is to establish the piping for the chilled and hot water systems. He should have a clear understanding of the piping that must be incorporated into the system.

Mechanics who work in the complex heating, ventilation, and air conditioning (HVAC) industry play a vital role in keeping the rest of us comfortable in our homes and businesses. An HVAC mechanic can be responsible for the installation and maintenance of a wide range of commercial and residential heating and cooling equipment. An HVAC mechanic must have a strong knowledge of electrical properties, physical science, and the mechanical processes that allow HVAC systems work.

After education and training requirements are met, an HVAC mechanic is usually required to take a licensing exam to work in a specific state or country. Special certification is not typically required, though many employers consider HVAC certification a plus. Certification tests are administered by several different accredited agencies, including HVAC Excellence and the Air-Conditioning and Refrigeration Safety Coalition.

 

For example, air pumps are used in aquariums and in ponds. An aquarium pump and a pond air pump usually have the same goal — to diffuse oxygen into the water to make it more inviting and easier for animal life. However, manual pumps would not be very effective at this. So in this type of application, an automatic pump is required, even though it may not be used 100 percent of the time.

A programmable digital thermostat is a device which controls the operations of a climate control system. A programmable digital thermostat is more accurate, efficient and flexible than an analog thermostat. Digital thermostats have continued to grow in popularity as more consumers become both environmentally and energy conscious.