Initial Start-Up; Preparing The Boiler For Operation - Buderus 800 User Manual

2

Initial start-up

2.1

Preparing the boiler for operation

2.1.1 Filling the heating system
WARNING
The wall-mounted condensing gas boiler
must not be activated at this stage.
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.
Wall-mounted condensing gas boiler Buderus 800 - Subject to modifications resulting from technical improvements!
fig. 24 Mechanical switch on the three-way valve
stop
valve
double
check
valve
DHW
cold
fig. 25 Connecting temporary hose
11
I
KW
0 0 1
1 2
1
10
1 10
1 10
fig. 26 Pressure display
Initial start-up
stop
valve
temporary
hose
CH
return
2
23