Internal Extension H - Viessmann VITOLADENS333-F Service Instructions Manual

Type vp3s, 12.9/19.3 kw, 16.1/23.5 kw oil fired compact condensing boiler, for the combustion of low sulphur fuel oil din 51603-el-1
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Function description
Control unit
(cont.)

Internal extension H3

The internal extension is factory-fitted
into the control unit casing. The fol-
lowing functions are connected to the
relay outputs:
Internal circulation pump
aXA Oil preheater
84

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