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Viessmann VITODENS 242-F Installation And Service Instructions Manual page 138

3.2 to 26 kw gas condensing/solar storage combi boiler gas council no. 41-819-18; 41-819-19 natural gas and lpg version
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Troubleshooting
Repair
(cont.)
Draining the boiler on the heating water side
A
1. Close the shut-off valves on the heat-
ing water side.
2. Route hose at drain valve A into a
suitable container or drain outlet.
138
3. Open drain valve A and drain the
boiler as much as required.

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