Hi, can anyone give me possible reasons for the h/w expansion tank overflowing particularly from cold start up. I have tried the following.
1) Lowered the boiler circulating pump pressure
2) Lowered the hot water cylinder circulating pump pressure
3) Extended the overflow pipe to be about 2.5 feet above the tank.
The system has dual temperature valve controls that independently turn off the heating in the radiators at ground level and first floor level
Any help or advice appreciated
Aidan
1) Lowered the boiler circulating pump pressure
2) Lowered the hot water cylinder circulating pump pressure
3) Extended the overflow pipe to be about 2.5 feet above the tank.
The system has dual temperature valve controls that independently turn off the heating in the radiators at ground level and first floor level
Any help or advice appreciated
Aidan