SYSTEM FOR REGULATING TEMPERATURE OF HOT WATER IN WALL-HUNG INSTANTANEOUS MIXED GAS HEATING UNITS

摘要

"SYSTEM FOR REGULATING TEMPERATURE OF HOT WATER IN WALL-HUNGINSTANTANEOUS MIXED GAS HEATING UNITS"A B S T R A C TSystem for regulating temperature of hot water in a wall-hunginstantaneous mixed gas heating unit, in which the value of thetemperature detected by a sensor inserted on the output of thesecondary circuit of the hot water exchanger is compared with a setvalue, and their difference or error value is sent to the input ofan amplifier of proportional-integrational-derivative type(P.I.D.), whose output is connected to one input of a selector ofminimum value or power, to the other input of which is sent thedifference or error value between the temperature of the heatingsystem water and the corresponding maximum tolerable settemperature. The output of the selector then commands the gasmodulating valves through a power amplifier, as well as the gason/off operating valve through comparison with a signalproportional to the minimum thermal power that can be supplied bythe heating unit.