The size of the expansion tank is determined on the basis of the total water contents in the heating system.
Open expansionstank: App. 8% of total water content of the heating system.
The open expansion tank can be replaced with a closed expansion tank.
Insofar as a system has been established with a closed expansion tank, manual stoking of the boiler is not
permitted
3.4.2 Thermal outflow safety device (optional extra)
To ensure that the boiler can be switched off quickly, a safety heat exchanger with thermal outflow safety
device must be fitted in closed systems:
1,5 Bx part no. 080248
2,5 Bx part no. 080247
Safety device for type
4,0 Bx part no. 080249
Connection width Ø 18 mm.
Water connection pressure min. 2.0 bar
The water inflow line may not be blockable and the outflow line must be free.
Check the outflow safety device yearly.
Page 17
3.4.3 Fitting the thermal outflow safety device
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