In order to solve my noisy trv problem I have just replaced my pump with a Grundfos Alpha. During fitting it became obvious the the original layout (about 35yrs old) had the pump on the boiler return. As the new pump/trvs are still producing noise, I wonder if the G/Alpha is not capable of sensing the required info for it to slow down (anybody know what they sense?) Another 'iff area' is I had to fit with the inlet/outlet in the horizontal plane (as was the original) and the motor shaft horizontal. Grundfos instructions require the 'motor shaft' to be horizontal, but show a pic with the in/out vertical! Anyone got any thoughts on this one please?
- posted
18 years ago