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2
Commissioning
2.1
Preparing the boiler for operation
CAUTION
DO NOT operate the condensing gas boiler if
large amounts of dust are present, e.g. due to
building work in and around the place of instal-
lation.
2.1.1
Fill the heating system
WARNING
The wall-mounted condensing gas combi
boiler must not be activated at this stage.
Loosen the automated air vent one turn (fig. 36).
If necessary open the CH flow and CH return servicing
valves (fig. 37, item 1 and 2).
Connect filling loop (fig. 38).
Open both stop valves (fig. 38).
Fill the system to a pressure of approx. 1.5 bar (fig. 37,
item 3).
Shut both stop valves.
Disconnect the filling loop.
Vent all radiators from air starting with the lowest radiator
and working your way up to the highest point.
Check the pressure after venting. If the pressure has
dropped under 1.0 bar then top up the system as described
previously.
Disconnect the filling loop and cap off.
To drain the boiler take the following steps:
Close the MCW inlet and the CH return valve.
Connect drainage hose (fig. 39).
Close the CH return and CH flow valves.
Connect draining hose to draining point on the manifold
(fig. 39, item 1).
Open draining point to drain the boiler (fig. 39, item 1).
Subject to modifications resulting from technical improvements!
30
Installation and maintenance instructions for Buderus 500 - 24/C and 500 - 28/C • 02/2005
1
fig. 36 Automatic air vent
3
MCW
inlet
CH
Gas
flow
1
fig. 37 servicing shut off valves
stop
valve
double
check
valve
MCW
inlet
fig. 38 Connecting filling loop
stop
valve
CH
flow
fig. 39 Draining the boiler
Boulter Buderus Ltd. • http://www.boulter-buderus.co.uk
DHW
outlet
CH
return
stop
valve
filling loop
CH
return
1
drainage hose
stop valve
MCW
drain
Drain
inlet
CH
return
2
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