Draining The Boiler On The Dhw Side - Viessmann VITODENS 242-F Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps

Draining the boiler on the DHW side

1. Connect hose to drain valve and
route into a suitable container or drain
outlet.
Note
Ensure adequate ventilation in the
DHW pipework.
66
(cont.)
2. Turn drain valve from lever position
A to lever position B or C as
required.
■ Lever position B: To drain the
heating system but not the cylinder
via the cold water connection.
■ Lever position C: To drain the
heating system and the cylinder via
the hot water connection. Cold
water connection remains filled.