Circulation control of gas fired boiler for central heating - has electrical devices for conversion of temp variations to voltages and thence into differential pressure variations

摘要

A device for control of boilers in gas fired hot water central heating systems having devices to convert the continuous variations of differential pressure of water in the system to continuous variation in gas supply to the boiler and devices for automatic cut off of gas supply to the burner for preset peak values, has devices for conversion of uniform continuous variation of temperature t into continuous variations of an electrical voltage V. Other devices convert the continuous variations of voltage V into continuous variations of differential pressure.