Viessmann VITODENS 100-W Installation And Service Instructions Manual page 33

Gas fired wall mounted condensing boiler natural gas version type wb1a

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Installing the boiler and making all connections

Gas connection

A Gas connection: ½" BSP

Installing water fittings

Combi boiler

A Heating flow: 722 mm

Installation sequence

(cont.)

1. Connect the gas supply to the gas

inlet connection on the gas cock

A. Upon completion, tighten the

union connection.

2. Carry out a gas soundness test.

3. Purge the gas supply pipe.

B DHW: 715 mm

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