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Viessmann Vitoplus 300 Service Instructions Manual page 88

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.)
Internal extension H3
The internal extension is integrated
into the control unit casing. The fol-
lowing functions are connected to the
relay outputs:
sÖ
Internal circulation pump
aXA Oil preheater
88

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