Initial start-up
2
Installation and maintenance instructions for wall-mounted condensing gas boiler 600 - 28C • 01/2004
23
Subject to modifications resulting from technical improvements!
Boulter Buderus Ltd. • http://www.boulter-boilers.com
z
Fill the system to a pressure of approx. 1.5 bar (fig. 32,
item 1).
z
Shut both stop valves and disconnect the filling loop.
z
Purge all radiators from air starting downstairs and working
your way up.
z
Check the pressure after purging. If the pressure has
dropped under 1.0 bar then top up the system as described
previously.
To drain the system take the following steps:
z
Close the DHW cold and the CH return valve.
z
Connect temporary hose (fig. 34).
z
Open the CH return stop valve to drain the system.
fig. 32 Pressure display
1
fig. 33 Purge the hot-water heat exchanger of air
1
fig. 34 Draining the system
Drain
Stop
valve
CH Flo
w
CH Retur
n
DHW Cold
Stop
valve
temporary
hose
Drain
