Venting The Heating System - Viessmann Vitodens 222-F Installation And Service Instructions For Contractors

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 when installing
the lute, seal off the condensate drain open-
ing.

Venting the heating system

Fig. 24
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.
Activating the venting function
Tap the following buttons:
1. "Menu"
2. "Service"
3. Enter "viservice" password.
(cont.)
C from lute D .
C .
A
Commissioning, inspection, maintenance
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.
3. Activate the venting program (see following steps).
Note
For function and sequence of the venting program,
see page 108.
4. Check the system pressure.
5. Open the gas shut-off valve.
4. "Service functions"
5. "Air vent valve"
6. Activate the venting function with "Yes".
The venting function ends automatically after
20 min or when you tap OK.
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