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so i think the valve is closed heating or just circulation, and i have found a temp sensor on the ch pipe, i assume the valve is moved to circulate if the system is at temperature. if i leave this in the fully open position then i think i have a c plan system just without the thermostat on the...

hi, recently moved into a new house, my boiler is an old one that was converted from oil to gas. the controller is not working, its a very old mechanical landys and gyr. the system is a little strange, the hw is for sure gravity and the ch is pumped however what is strange is there is a 3 port...