Operation Manual

ATAG A-Serie
9
5 Filling the heating system
This boiler is part of an 'Open Vent' heating
system. The system is not pressurized, but is
lled automatically by a lling system in the loft.
If there is a problem with this system, please
contact your installer.
When the heating system is lled and after a
power interruption the boiler will be reset and starts
with a venting program. After the venting program
(display shows c1 05) of approx. 7 minutes has
ended, the boiler will be operational again.
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In case of, for instance, a holiday:
Heating OFF:
Press the - key of the key until the lowest
value has been reached. Release the key and
press the – key once again. The display is showing
--. The program has thus disabled. The arrow to
the left is off.
In case of work on the heating installation:
Make sure no heat request occurs: set the room
thermostat to low. Pull the plug from the wall
socket. If the installation is being drained, you
have to take into account that part of the heating
water will remain in the boiler. Make sure that the
remaining heating water in the boiler cannot freeze
in case of frost.
6 Decommissioning the boiler