AboutJ Cook Expertise With 25+ years experience, I am familiar with residential, commercial, and industrial HVAC equipment including but not limited to boilers, chillers, reciprocating and screw compressors. I am trained in all manners of control wiring.
Experience I currently have three HVAC licenses and Refrigeration license by the State of North Carolina. I have been in this field for over twenty years. I have been a service technician for a contractor and also worked at a state college in the repair and maintenance of steam lines and equipment. I am currently the Building Maintenance Superintendent for a municipality.
Question what would cause your furnace to ignite when using your kitchen hoodfan when the interlock should only cause the fan to come on to replace the air your hoodfan is removing
Answer I am not sure who said the furnace fan will replace the exhausted air, but this is not the case. You are removing air from a space with an exhaust fan and a furnace fan is just recirculating existing air, it is not picking up any new air. A true exhaust fan set up has make up air that is pulled in at the same rate the exhaust fan is removing the air. The furnace will ignite only based on temperature drop and exhausting the heated air will drop the temperature and the furnace will have to heat. Thanks J
