The flue pipe is deemed to be sound if
the CO2 concentration in the combus-
tion air is no higher than 0.2 % or the
O2 concentration is at least 20.6 %.
If actual CO2 values are higher or O2
values are lower, then pressure test
the flue pipe with a static pressure of
200 Pa.
Draining the heating system
!
Please note
Risk of scalding
Only drain the heating system
when the boiler water has
dropped below 40 °C.
1. Switch ON the control unit and call
up the relay test:
Constant temperature control
unit:
K + d press simultaneously for
at least 2 s.
a/b press, until "5" is dis-
played.
Weather-compensated control
unit:
K + d press simultaneously for
at least 2 s.
a/b press, until "Valve in mid-
dle pos." is displayed.
2. Wait until the valve has moved into
its central position (approx. 5 s),
then switch OFF the main ON/OFF
switch "8" at the control unit.
3. Drain the heating system via the
boiler fill & drain valve A.
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