Buderus Logano GE315 Installation And Maintenance Instructions Manual page 46

6 Maintenance
The water pressure in the system is too low, if the
pressure gauge needle falls below (Fig. 61, [2]) the
green range (Fig. 61, [3]). You then need to re-fill the
heating system with make-up water (see chapter 3
"System start-up", page 33).
SYSTEM DAMAGE
through temperature stresses.
CAUTION!
The boiler must only be filled via a filling
tap installed in the return pipe. (In the
UK the boiler must be filled used a
W.R.A.S. approved method).
Top up with water as required.
Vent the heating system.
Check the water pressure once more.
46 Logano GE315 - We reserve the right to make any changes due to technical modifications