Viessmann Vitoplus 300 Service Instructions Manual page 86

Wall mounted oil fired condensing boiler for the combustion of low sulphur fuel oil din 51603-el-1 with integral boiler control unit
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Function description
Control
(cont.)
DHW heating boost
The heating booster function is acti-
vated, if a switching period is selected
for the fourth time phase. This period
must lie outside the switching times
for standard DHW heating to enable
the control unit to recognise the sig-
nal. The set temperature value for
backup heating is adjustable in coding
address "58".
A Pressure gauge
B Fault display (red)
C ON indicator (green)
D Reset button
86

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