View attachment 222822
I can't work out which way is up on this pic. It looks as if the pump is lying on the floor pointing upwards which, if it is, is the worst way to install a pump as it will wear out very quickly due to lack of lubrication. The pump shaft mut always be horizontal.
If the pump is installed as at appears in the pic, it could already be worn out as the flow/return differential (A2-A1) of nearly 30 degrees says that the flow rate is much too low, which could indicate a damaged pump.
You asked about A1 and A2 being the same when the boiler cuts out. Do you mean when the flame goes off or when the pump stops working? Normally there will be a noticeable temperature differential until the flame goes out, but this will reduce as the pump continues to run for a few minutes (pump overrun).
I can't work out which way is up on this pic. It looks as if the pump is lying on the floor pointing upwards which, if it is, is the worst way to install a pump as it will wear out very quickly due to lack of lubrication. The pump shaft mut always be horizontal.
If the pump is installed as at appears in the pic, it could already be worn out as the flow/return differential (A2-A1) of nearly 30 degrees says that the flow rate is much too low, which could indicate a damaged pump.
You asked about A1 and A2 being the same when the boiler cuts out. Do you mean when the flame goes off or when the pump stops working? Normally there will be a noticeable temperature differential until the flame goes out, but this will reduce as the pump continues to run for a few minutes (pump overrun).