Bleed (Vent) Air From Boiler Heat Exchanger - Viessmann Vitodens 200-W Service Instructions Manual

Start-up and Service

Bleed (Vent) Air from Boiler Heat Exchanger

14
Vitodens 200-W B2HA 80, 100 Service
1. Close isolation valves (not shown) connected to A
and B.
2. Connect drain hose to drain valve C, and connect fill
hose to boiler fill valve F.
3. Close isolation valve D (located inside the boiler).
4. Open fill valve F.
5. Bleed air from boiler heat exchanger via isolation
valve E and out through drain valve C until no more
air noise is audible.
6. Close isolation valve E and open isolation valve D.
7. Bleed air from boiler heat exchanger via isolation
valve D and out through drain valve C until no
more air noise is audible.
8. Close fill and drain valves C and F. Open isolation
valve E.
Note: Isolation valves D and E must be open for
the boiler to operate properly (each flow pipe
through valves D and E is equipped with a
flow switch).
9. a. Close the gas shut-off valve and switch the
control unit ON.
b. Activate venting program (see next steps).
Note: For function and sequence of the venting
program, see page 85.
c. Check the system pressure.
10. Activating the venting program:
Service menu
- Press OK and simultaneously for approximately
4 seconds.
- "Service functions"
- "Venting"
Venting function is enabled.
Ending venting function:
- Press OK or .
11. Check system pressure.
12. Ensure adequate fuel supply exists and open gas
shutoff valve.