Draining The System In Case Of Frost - Buderus 500 Series User Manual

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
system. Especially when there is a chance for frost conditions.
Turn off the boiler by setting the mains power to "0" (fig. 5,
item 1).
Close the gas valve (fig. 8, item 1).
fig. 9 Draining the system
Drain the system at its lowest point using the stop valves or
radiator (see fig. 9). The automatic air vent at the system's
highest point must be open.
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Notes
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