Viessmann Type B2HA Operations Instructions download pdf (Page 32)

1. Close the shut-off valves on the heat-

ing water side. If required, remove the

safety guard.

2. Push the drain hose (supplied inside

the appliance) onto top valve

and

connect to a drain.

Open valves A and B and vent at

mains pressure (purge) until no

sound of escaping air can be heard

and no more air bubbles are visible.

Note

Note the system pressure at the pres-

sure gauge. Do not exceed 1.5 bar.

First close valve B.

5. When the required operating pres-

sure has built up, close valve

Open the shut-off valves on the heat-

ing water side.

6. Remove the drain hose from top

valve

and retain.

Venting the heating system

1. Close the gas shut-off valve and

switch the control unit ON.

2. Check whether the air vent screw on

quick-action air vent valve

of the

heating circuit pump is open.

3. Activate venting program (see follow-

ing steps).

Note

For function and sequence of the

venting program, see page 150.

4. Adjust the system pressure.

5. Open the gas shut-off valve.

Commissioning, inspection, maintenance

Further details regarding the individual steps

(cont.)

5772 909 GB

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Viessmann Type B2HA Operations Instructions Page 32