I installed an Alpha during the summer and, now the CH is on, I've noticed that whenever the Suprima re-fires after the boiler stat has shut it down, then the Alpha speeds up before gradually settling down again. This means that, contrary to the way it's supposed to work, the noise through our TRV's is quite loud, and all the more noticeable because it comes & goes each time the boiler cycles. The Alpha is set at the lowest point on its variable scale. I *think* that what's happening is that the Suprima is momentarily disconnecting the pump as the boiler fires? If this is true, then the pump is acting correctly. Is this (disconnection of the pump) a known *bug* with the Suprima? Thanks Rory
- posted
19 years ago