Matching The Circulation Pump To The Heating System - Viessmann VITODENS 100-W Installation And Service Instructions Manual

Commissioning, inspection, maintenance
Further details regarding the individual steps

Matching the circulation pump to the heating system

Only for gas condensing combi boilers:
In the delivered condition, the circulation
pump in heating mode is set to stage 1.
If necessary to suit the heating system,
the circulation pump can be set to
stage 2.
700
600
500
400
40
30
300
20 200
10
100
0 200
Flow rate in l/h
A Gas condensing boiler 26 kW
Gas condensing combi boiler
26 kW, pump stage 1
B Gas condensing boiler 30 kW
Gas condensing combi boiler 30
and 35 kW, pump stage 1
34
A
400 600 800 1000 1200 1400
(cont.)
5. Transfer selected heating output:
Turn rotary selector "tw" for less
than 2 s fully clockwise and then back
into its control range on the right.
During the transfer, the display
shows "– . – . –".
6. Shut down the boiler.
E
D
C
B
C Gas condensing combi boiler
26 kW, pump stage 2
D Gas condensing boiler 35 kW
Gas condensing combi boiler 30
and 35 kW, pump stage 2
E Upper operational limit