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Internal Extensions - Viessmann FB2A Installation And Service Instructions For Contractors

Compact energy tower with a gas condensing boiler, 4.8 to 26 kw natural gas and lpg version, g.c. no: 47-819-18/47-819-19 19 kw/26kw
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Function description

Internal extensions

Internal extension H1
The internal extension H1 is integrated
into the control unit casing. The cylinder
primary pump is connected to relay out-
put sK.
108
An external safety valve can be connec-
ted to gD.

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