Method and apparatus for controlling forced air heating and/or cooling

摘要: A forced air heating and/or cooling system in a building is provided with the usual main supply conduits or duct which have various branch ducts leading to different areas of building. Pressure sensitive instruments at spaced locations are connected by electrical wiring pneumatic tubing comparing instrument senses pressure signals from zones determining maximum required that must be supplied system. Zone thermostats sense increases room temperature and operate conventional variable volume boxes increase thereby lowering pressure. The sends signal speed drive comprising motor having spring loaded pulley belt fan electrically driven separate means adjust tension on changing for more economical operation.