This weekend my central heating system with velbus started up and i have some small problems…
Every time the boiler starts to warm, the valves aren’t open jet and the boiler goes in safety because he warms to quickly.
The valves opens and closes very slowly (3 minutes). Is it possible to set a delay time to the contact of the boiler?
I set a non restartable delayed on/off (22) on that contact, than the contact comes up with a delay, but if the contact should go off, it stays on…
Is there anyone that have the same problems?
I don’t have this problem since I always have 1 radiator with no valves (stairway), this way there always is a flow. You could also use a bypass to create a flow when no valves are opened. Those are operated on pressure, they will open when the pressure is too high (no valves are open yet) and close back again when the pressure is back low (so at least one valve open).
there’s no opurtunity to put a radiator in the stairway or somewhere else… The boiler goes in safety becouse he warms to quickly, i guess that whit a bypass this wil be the same. It would be nice if i can solve the problem with the programming of the modules…
Use the pump delay option and switch pump and boiler from pump switch in sensor.