Viessmann Vitocrossal 300 Service Instructions For Contractors page 50

Gas condensing boiler with matrix gas burner and lambda pro control, natural gas and lpg version open and balanced flue operation
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Commissioning, inspection, maintenance
Further details regarding the individual steps
Settings in the delivered condition:
■ Slope = 1.4
■ Level = 0
90
80
70
60
50
40
30
A Heating curve slope for underfloor
heating systems
B Heating curve slope for low temper-
ature heating systems (according to
the Energy Savings Order [Ger-
many])
50
10
5
0
-5 -10 -15 -20
Outside temperature in °C
(cont.)
Slope
-25
-30
1.4
1.2
1.0
B
0.8
0.6
A
0.4
0.2

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