Users manual
10
Users manual for Buderus 500-24S • 07/2007
Buderus • http://www.buderus.co.uk
Subject to modifications resulting from technical improvements
11
Taking the system out of service
z
Turn off the boiler by pressing the mains switch to "
0
" (fig. 4,
item 1).
z
Close the gas service valve by turning it clockwise
(fig. 7, item 1).
Frost protection
The boiler has an automatic frost protection. When the CH flow
temperature drops below 7 °C then the boiler will start up.
11.1
Draining the system in case of frost
It is not recommended, but if the boiler needs to be shut down
for a longer period of time, then it is necessary to drain the sys-
tem. Especially when there is a chance for frost conditions.
z
Turn off the boiler by pressing the mains switch to "
0
" (fig. 4,
item 1).
z
Close the gas shut off valve (fig. 7, item 1).
z
Drain the system at its lowest point using the stop valves or
radiator (see fig. 8). The automatic air vent at the system’s
highest point must be open.
fig. 7
Gas service valve
1
2
1
: Gas valve closed
2
: Gas valve open
fig. 8
Draining the system
