Users manual
Users manual for Buderus 500-24S • 07/2007
7
Subject to modifications resulting from technical improvements
Buderus • http://www.buderus.co.uk
10
Initial start-up
10.1
Preparing the boiler for operation
Please also note the user manual supplied with the
external time controls and thermostat.
10.1.1 Check water pressure
z
Check the pressure gauge (fig. 3, item 3) located at the
bottom of the boiler for the current system pressure.
Optimum system pressure is 1.5 bar.
10.1.2 Fill the heating system
The system should be filled with untreated mains water.
z
Turn off the boiler by pressing the mains switch to "
0
" (fig. 4,
item 1).
z
If necessary open the CH flow and CH return servicing
valves (fig. 3, item 1 and 2).
z
Connect filling loop (fig. 5).
z
Open both stop valves (fig. 5).
z
Fill the system to a pressure of approx. 1.5 bar (fig. 3,
item 3).
z
Close both stop valves.
z
Vent the air from all radiators starting with the lowest radia-
tor and working up to the highest point.
z
Check the pressure after venting. If the pressure has
dropped under 1.0 bar then top up the system as described
previously.
z
Disconnect the filling loop and cap off.
fig. 3
Servicing shut off valves
CH Flow
Gas
CH Return
2
1
3
WARNING!
The wall-mounted condensing gas system boiler
must not be activated at this stage.
fig. 4
DBA – Mains switch
ON
OFF
1
fig. 5
Connecting filling loop
filling
loop
stop
valve
stop
valve
double
check
valve
external
MCW
supply
CH
return
NOTE
If there are frequent water losses, have the
system examined and repaired by a CORGI
registered installer. Have the inhibitor concen-
tration checked every year.
