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OLD TYPE EXPANSION TANK TROUBLESHOOTING
There is an expansion tank above the Delco Boiler...DB4S...12inch Diameter x 30 inches...grey in color with drain valve.
I looked in the museum on this site and saw a DB4 and it says 125,000 btu's..What is the S for?
I've drained the tank a number of times. Initially the boiler gauge is just above 12 and then a bit higher when water gets hot and expands. In a few days the gauge is higher...20 or more. That seems not too bad but it seems the first radiator in the line on first floor above boiler always has to be bled..and has between a count of 5 or so of air in it more than once a day.
1. I know the air may cause a flow problem and since this tank doesn't have a bladder air and water are mixing in tank.
2. Will the system perform better if I put a tank with a bladder in and what effect on heating does the air have in that radiator?
3. This old tank is about 2 cu ft. How do i size this tank properly..should I get the same size tank or use another formula?
4. Should I be concerned about this? Thanks!