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9. LONG TERM SHUTDOWN
It is recommended to leave the boiler turned on all year round to prevent frost damage in winter and moving
parts seizing due to corrosion during other times of the year. To switch the boiler off break the frost protected
control circuit (by others) or turn the room thermostat down (minimum power consumption is now assured);
the pump for the central heating and the fan will stop after a short delay.
If the boiler has to be put out of operation, the following action must be taken:
•
Close the gas cock.
•
Remove the electrical plug from the wall socket, or switch off the mains-power.
•
In the event of possible frost damage
: drain both the boiler and the system.
When draining the boiler, drain the system first. Then open the two drain cocks of the boiler.
•
Put the O/I switch to position “O” and the On / OFF switch in position “OFF”.
•
Isolate at local isolation.
•
Open the filling and drain valve of the central heating system and the boiler drain valve on the right- and
left-hand side of the boiler.
