METHOD FOR DETERMINING THE SET POINT OF THE FORWARD OR RETURN TEMPERATURE FOR A FORWARD OR RETURN TEMPERATURE CONTROL SYSTEM OF A CENTRAL HEATING SYSTEM, AND ELECTRONIC CIRCUIT ARRANGEMENT FOR IMPLEMENTING THE METHOD.

摘要

1. A method of determining the theoretical value (theta VS ) of the flow or return temperature for a flow or return temperature control system (6) of a central heating system with heat exchangers through which a fluid heat carrier flows in the rooms which are to be heated, where the theoretical value (theta VS ) is determined as the sum of an adjustable constant first value (Pl), a second value [(theta RS -theta R1 ).V] proportional to the control difference of the room temperature of a temperature determining room (pilot room), and a third value formed from the product [K.(P2-theta A)] of a proportionality constant (K) and the difference between an adjustable fixed value (P2) and the external temperature (theta A ), characterised in that at specific instants in time the existing value of the proportionality constant (K) is replaced by an up-dated value in the form of the quotient [(theta VS 1)/(P2 theta A )] of a first difference value (theta VS -Pl) derived from the current theoretical value (theta VS ) of the flow or return temperature and the constant first value (Pl), and a second difference value (P2-theta A ), derived from the adjustable fixed value (P2) and the external temperature (theta A ), if the flow or return temperature control system assumes a built-up state in the interval of time which precedes this instant for the determination of the proportionality constant (K).