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Gas combi boiler
If the flow switch recognises that DHW is
drawn off (> 3 l/min), the burner and cir-
culation pump are switched ON and the
three-way valve changes over to DHW
heating.
The burner modulates to reach the DHW
outlet temperature and is limited on the
boiler side by the temperature limiter
(84 °C).
Extension for external connections (accessory)
The external extension H3 can be con-
nected to the Vitopend 100-W control
unit.
Installation instructions
External extension H3
With the external extension H3, extractor
fans can be locked out in the case of
open flue operation.
Function description
DHW heating
(cont.)
5441 514 UAE
Содержание Vitopend 100-W
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