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Internal H3 Extension - Viessmann Vitoladens 300-W Installation And Service Instructions For Contractors

Wall mounted oil condensing boiler for the combustion of fuel oil to din 51603-1 el (low sulphur)
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Control unit
(cont.)

Internal H3 extension

Fig. 53
The internal extension is factory-fitted inside the con-
trol unit enclosure. The following functions are connec-
ted to the relay outputs:
Internal circulation pump
sÖ
Oil preheater
aXA
Function description
93

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