I have done a little bit of research into the variable speed drive motors that are commonly part of "eco-friendly" green HVAC systems.
I have found in many cases that the installer sells SEER-rated components as part of their most efficient packages, but in most cases the installation takes no advantage of the variable speed drive capabilities of the SEER-rated blower and compressor motors because they are wired up to work only at a single speed. In my particular case, my house's HVAC had a blower motor that failed. It was a $1100 SEER-rated variable speed blower motor. It was only 3 years old. It was only wired up to work at a single speed. I replaced it with a $200 capacitor-start motor. Tim N3QE On Sun, Dec 14, 2014 at 1:08 AM, Jim Brown <j...@audiosystemsgroup.com> wrote: > > On Sat,12/13/2014 5:35 PM, Don Kirk wrote: > >> Now going back to the contractor that installed the equipment in an >> attempt >> to better understand the hardware in the unit >> > > That smells like a Variable Speed Drive, the heart of which is a switching > power supply that generates pulses in the 10 kHz range, the width of which > are varied to control the speed of the motor. Lots to go wrong here -- > switching power supply, square pulses of big current running a distance > between the controller and the motor, often with supply and return > conductors widely separated from each other, and with controller and motor > widely separated, so the current flows in a large loop. Can you say train > wreck? > > 73, Jim K9YC > > _________________ > Topband Reflector Archives - http://www.contesting.com/_topband > _________________ Topband Reflector Archives - http://www.contesting.com/_topband
