Continuing my discussion on the major components of HVAC unit I would like to discuss circuit boards/zone dampers. The circuit board simply controls the sequence of events needed for proper operation of the equipment. Most new equipment now use circuit boards instead of a series of relays and timers.
Circuit boards are generally very reliable, which is good because they are usually very expensive. Most new A/C and HVAC units will come a quality circuit board. Here at Jones Air Conditioning of Naples (239) 596-5855 we will test you board and determine if it needs to replaced; before other serviceman will simply replace the part without a proper diagnosis
In a HVAC unit circuit boards control most of the major function of the units especially when it comes to sequential operations. See Video http://youtu.be/8N2KYpYkG00