US 11,054,150 B2
Diagnostic method for diagnosing the correct operation of a heating and/or cooling system
Erik Baasch Sørensen, Bjerringbro (DK); and Martin Clausen, Bjerringbro (DK)
Assigned to GRUNDFOS HOLDING A/S, Bjerringbro (DK)
Appl. No. 15/34,672
Filed by GRUNDFOS HOLDING A/S, Bjerringbro (DK)
PCT Filed Oct. 13, 2014, PCT No. PCT/EP2014/071923
§ 371(c)(1), (2) Date May 5, 2016,
PCT Pub. No. WO2015/067439, PCT Pub. Date May 14, 2015.
Claims priority of application No. 13192029 (EP), filed on Nov. 7, 2013.
Prior Publication US 2016/0273787 A1, Sep. 22, 2016
Int. Cl. F24D 19/10 (2006.01); G05B 9/02 (2006.01); F24D 3/02 (2006.01); G01F 1/34 (2006.01)
CPC F24D 19/1015 (2013.01) [F24D 3/02 (2013.01); F24D 19/1036 (2013.01); G01F 1/34 (2013.01); G05B 9/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A diagnosis method for a diagnosis of a correct function of a heating and/or cooling system with at least one load circuit, through which a fluid flows as a heat transfer medium, the method comprising the steps of:
changing, for the diagnosis, an opening degree of the at least one load circuit for changing the flow;
subsequently detecting a differential pressure across the load circuit or a volume flow of a fluid flowing through the load circuit or both a differential pressure across the load circuit and a volume flow of a fluid flowing through the load circuit to provide detected values;
comparing the detected values or comparing a value derived from the detected values to at least one predefined system limit value;
determining whether the heating and/or cooling system is functioning properly based on the comparison of the detected values or the value derived from the detected values to the at least one predefined system limit value, wherein:
several load circuits are present and the opening degree in each case of one of the load circuits is changed in a successive manner for diagnosis;
simultaneously, the opening degree of further remaining load circuits remains unchanged and subsequently the differential pressure or the volume flow or both the differential pressure and the volume flow of the fluid flowing through the load circuit with an increased opening degree are detected and the detected values or a value derived from the detected values are compared to at least one predefined system limit value;
an error notice is issued if a deviation from the at least one predefined system limit value is measured;
the error notice indicates to a user or operator of a malfunction of the heating and/or cooling system necessitating an inspection of the heating and/or cooling system.