Furnace (forced or gravity fed warm air) temperature setting controls: Warm air furnace temperatures are controlled at the FAN LIMIT SWITCH For more diagnostic aid on finding the cause and executing the cure of abnormal heating boiler pressures see LEAKS at BASEBOARD, CONVECTOR, RADIATOR - how to...
For example, each individual furnace or boiler may be connected to a respective control device that controls the flow of combustion air and exhaust air through that furnace alone. The control device may also effect a furnace shut down procedure during unstable conditions. Mechanical rooms can also...
The pressure loss in the recuperator depends on the fur- nace or kiln temperature. When the furnace or kiln tempera- ture is increased (at a constant air supply pressure), the flow rate drops. This change in the air flow rate is measured by the orifice and the ...