The design should also ensure that the temperature in the expansion tank is kept below 70°C. Do not insulate the expansion tank or the pipes connected to it. Perform maintenance operations with the fluid at temperatures below 60°C. Replace mechanical pump seals and gaskets only if leaks are detected.
Another type of closed expansion tanks are adjustable tanks for which a constant pressure is considered in advance according to the volume of water and the conditions in the tank. As the water temperature increases its pressure and volume increase and after reaching the allowable the drain valves open and the excess gas comes out.
Jan 13 2007 · NJ I believe the boiler aquastat is a cold start control and if L1 was wired to the strap on and it was utilized as a close-on-temp-rise aquastat with the other side wired into C1 with that terminal also wired to the hot side of the circulator then if the thermostat called for heat the aquastat would send power to C1 making the circulator run.
Nov 12 2013 · During the summer when the boiler is not heating the home the aquastat is operating strictly off of it's LOW LIMIT. Water to the taps can be no hotter than that temperature. Once the boiler starts working to heat the home if you go to draw hot water when the is working on a heat call the HIGH is what controls the ...