Buderus 800 - Initial start-up; 2.1 Preparing the boiler for operation; 2.1.1 Filling the heating system

Initial start-up 2
Wall-mounted condensing gas boiler Buderus 800 - Subject to modifications resulting from technical improvements!
23
2 Initial start-up
2.1 Preparing the boiler for operation
2.1.1 Filling the heating system
When using oxygen-permeable pipes (e.g. for floor
heating), heat exchangers must be used to separate the
system.
 Move the mechanical switch on the three-way valve
to centre position (fig. 24) (applicable for 800-24T25
and
800-29T25 only) and systems with an external stor-
age-type water heater.
 If necessary open the CH flow and CH return mainte-
nance valves.
 Connect temporary hose of the filling loop (for pipe
locations see page 6 and 7).
 Open both stop valves.
 Fill the system to a pressure of 1.0 to 1.2 bar (fig. 26,
item 1). Max. water pressure is 2.0 bar.
 Shut both stop valves and disconnect the filling loop.
fig. 24 Mechanical switch on the three-way valve
WARNING
The wall-mounted condensing gas boiler
must not be activated at this stage.
fig. 25 Connecting temporary hose
temporary
hose
stop
valve
stop
valve
double
check
valve
DHW
cold
CH
return
fig. 26 Pressure display
12
10
1
01
11
KW
10
1
10
1
I
0