Buderus 500 Series User Manual page 20

10 Initial start-up
stop
valve
external
MCW
supply
fig. 6 Filling loop
Connect filling loop (accessory) (fig. 6).
Open both stop valves (fig. 6).
Fill the system to a pressure of approx. 1.5 bar
(fig. 4, item 3).
Shut both stop valves.
Disconnect the filling loop.
Vent all radiators from air starting with the lowest radiator
and working your way up to the highest point.
20
double
check
valve
filling
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stop
valve
loop
CH
return