Cycling on/off every 3 minutes? so if a non modulating boiler, output is only either 8kw or 11kw so something amiss with 18 rads.
If one assumes 25kw total rad demand, then the circ rate required is 30LPM (1.8M3/hr) at a dT of 12C.
Check that the present pump is set to max speed, setting 3 or III.
If one assumes 25kw total rad demand, then the circ rate required is 30LPM (1.8M3/hr) at a dT of 12C.
Check that the present pump is set to max speed, setting 3 or III.