Draining The Boiler Or Heating System; Checking And Cleaning The Burner - Viessmann Vitopend 100-W Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps
11. Open the gas shut-off valve and
start the appliance.

Draining the boiler or heating system

!
Please note
Risk of scalding
Only drain the boiler or the heat-
ing system when the boiler water
or the cylinder temperature has
dropped below 40 °C.

Checking and cleaning the burner

Switch OFF the power supply and the ON/OFF switch at the control unit.
Close the gas shut-off valve and safeguard against reopening.
22
Danger
Gas escaping from the test
nipple leads to a risk of
explosion.
Check the test nipple for gas
tightness.
Note
The boiler or the heating system can only
be drained if the servomotor of the
diverter valve is in its centre position (see
page 14). As soon as the servomotor of
the diverter valve is in its centre position,
switch OFF the ON/OFF switch on the
control unit to prevent the pump from
running dry.
(cont.)