Checking The Balanced Flue System For Tightness (Annular Gap Check); 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
Checking the balanced flue system for tightness (annular gap
check)
A
A Combustion air test point (ventila-
tion air)

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 main power supply and the ON/OFF switch at the control unit.
Close the gas shut-off valve and safeguard against reopening.
26
(cont.)
The flue pipe is deemed to be sufficiently
gas-tight if the CO
combustion air is no higher than 0.2% or
the O concentration is at least 20.6%.
2
If actual CO values are higher or O
2
ues are lower, then pressure test the flue
pipe with a static pressure of 200 Pa.
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 18). 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.
concentration in the
2
2
val-