Buderus 500 Series User Manual page 21

Check the pressure after venting. If the pressure has
dropped under 1.0 bar then top up the system as described
previously.
Disconnect the filling loop and cap off.
NOTE
I
If there are frequent water losses, have the system
examined and repaired by a CORGI registered
installer. Have the inhibitor concentration checked
every year.
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Initial start-up 10
21