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We reserve the right to make technical modifications
Buderus Ltd. • http://www.buderus-domestic.co.uk
Servicing manual Gas condensing boiler Buderus 500-24/S, 500-24/C and 500-28/C • Issued 02/2006
39
box 49
z
Loosen by one turn the sealing cap on the automatic air
vent located on the top left-hand part of the boiler.
box 50
Key to terms:
1
= CH flow
2
= DHW outlet (combination boilers only)
3
= Gas connection
4
= MCW inlet (combination boilers only)
5
= CH return
z
Connect the hose (item 6) to the drain cock of the boiler.
z
Open the filling and draining cock and drain the heating
system, see box 53.
box 51
z
Fit the casing and use the radiator key to turn the casing
lock to “closed”.
6
1
2
3
4
5
box 52
Filling the system and venting it of air
z
Turn the operating switch on the boiler to position “
0
”
(OFF), see box 43.
z
box 53
z
Connect filling loop (accessory), see box 50, item 6.
z
Open both stop valves.
z
Fill the system to a pressure of approx. 1.5 bar.
z
Shut both stop valves.
z
Disconnect the filling loop.
z
Vent all radiators from air starting with the lowest radiator
and working your way 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.
box 54
z
Turn the mains switch to “ON”.
filling loop
stop
valve
stop
valve
double
check
valve
DHW
cold
CH
return
per
manent
live
ON
