Apparatus for controlling the supply temperature in a central heating installation

Claim 1

Apparatus for controlling the heating fluid temperature in a central heating installation having at least two radiators arranged in different rooms and associated valves comprising, a thermostat assembly for each room including a thermostat having an output with first and second output signals corresponding to demand and satisfied conditions, said assembly including valve means controlled by said thermostat having open and closed states corresponding to said first and second output signals, said assembly including amplifier means connected to said thermostat output, said amplifier means having input network means which generates a rising voltage pursuant to said thermostat demand condition, comparator means connected to all of said amplifier means, said comparator means having an upper control limit for actuating said comparator means when said limit is exceeded, cool and warm sources of fluid and a connecting mixing valve, a servomotor for said mixing valve, first and second second circuit means for respectively rotating said servomotor in heating and cooling directions, first and second control means for said first and second circuits, said first control means being responsive to said comparator means, said first control means having priority over said second control means.