Switching On The Power Supply And The On/Off Switch; Information On Automatic Testing Of The Flue Gas Temperature Sensor; Venting The Heating System - Viessmann Vitodens 222-F Installation Instructions For Contractors

Commissioning, inspection, maintenance
Filling the trap with water
3. Disconnect corrugated hose
4. Turn lute, tilt slightly and pull downwards.
5. Fill the lute with water.
6. Refit lute
D and push on corrugated hose
!
Please note
To prevent water escaping, seal off the con-
densate drain during installation.

Switching on the power supply and the ON/OFF switch

Information on automatic testing of the flue gas temperature sensor

Immediately after being switched on, the control unit
automatically checks the function of the flue gas tem-
perature sensor.
The display shows: "A".

Venting the heating system

Fig. 22
1. Close the gas shut-off valve and switch the control
unit ON.
2. Check whether the air vent screw in quick-action
air vent valve of the heating circuit pump is
A
open.
28
(cont.)
C from lute D .
C .
A
7. Reassemble the trap in reverse order.
8. Check that the condensate pipe is connected cor-
rectly to the trap and heat exchanger.
Note
Route the drain hose without any bends and with a
constant fall.
9. Fit cover panel and secure control unit back in its
operating position.
Note
If the flue gas temperature sensor is positioned incor-
rectly, commissioning is cancelled and fault message
A3 is displayed (see page 71).
3. Activate the venting program (see following steps).
Note
For function and sequence of the venting program,
see page 98.
4. Check the system pressure.