Control for hot water heating system - has thermostats on radiators and in flue to regulate fuel and air flow to boiler

摘要

The heater system consists of a closed loop containing water which circulates to the radiators by means of pump. Thermostats measure the water temp. at the pump, the radiator. Further thermostats measure the flue and the return water temps. The control system regulates the fuel and air quantities. The system also has a room thermostat.