Information On Automatic Testing Of The Flue Gas Temperature Sensor; Venting The Heating System; Filling The Trap With Water - Viessmann VITODENS 200-W B2HA Installation And Service Instructions Manual

Commissioning, inspection, maintenance

Information on automatic testing of the flue gas temperature sensor

Weather-compensated control unit
The control unit automatically checks the function of the
flue gas temperature sensor as soon as the time and
date have been set.
The display shows: "Testing, flue gas temp sensor"
and "Active".
Note
If the flue gas temperature sensor is positioned incor-
rectly, commissioning will be cancelled and fault mes-
sage A3 displayed (see page 96).

Venting the heating system

1. Close the gas shut-off valve and switch the control
unit ON.
2. Activate the venting program (see following steps).
Note
For function and sequence of the venting program,
see page 107.
Activating the venting function
Weather-compensated control unit
Service menu
1. Press OK and simultaneously for approx. 4 s.
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2. "Service functions"
3. "Venting"
Venting function is enabled.
4. Ending venting function:
Press OK or .
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Filling the trap with water

Multi boiler system:
Fill the trap in the flue gas header with water as well.
36
Constant temperature control unit
Immediately after being switched on, the control unit au-
tomatically checks the function of the flue gas tempera-
ture sensor.
The display shows: "A".
Note
If the flue gas temperature sensor is positioned incor-
rectly, commissioning will be cancelled and fault mes-
sage A3 displayed (see page 96).
3. Check the system pressure.
Constant temperature control unit
Service menu
1. Press OK and simultaneously for approx. 4 s.
å
2. Select " " with and confirm with OK.
5
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"ON" flashes.
3. Activate the venting function with OK.
"EL on" is shown constantly.
4. Ending venting function:
Press .
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