Viessmann Vitocal 300-G Installation And Service Instructions Manual page 101

Connections on the secondary side (heating . . .
A Heating water flow (Multi-connect
system G")
B DHW cylinder flow (Multi-connect
system G")
C Heating water return DHW cylin-
der return (Multi-connect system
G")
Installation sequence
(cont.)
!
Please note
With underfloor heating cir-
cuits, there is a risk of building
damage through overheating
the screed, if the control fails.
Equip underfloor heating cir-
cuits with a temperature lim-
iter.
Note
Design the heating circuit as single
line heating circuit or with an overflow
valve (minimum flow rate 700 l/h) and
fill via boiler fill & drain valve A (see
Fig. on page 109).
Equip the heating circuit on site with
an expansion vessel.
101