Viessmann Vitodens 100-W WB1C Wiring Instructions

Note on installation
for heating engineers
System boiler wiring instructions
for Vitodens 100-W, Typ WB1B & Typ WB1C
The Vitodens 100-W system boiler
offers several installation alterna-
tives.
From traditional 'Y' or 'S' plan
(2-pipe system) to weather compen-
sated 4-pipe system connected to an
un-vented DHW cylinder using the
integral expansion vessel and diverter
valve.
5414 394 8/2009/14
The advantages of connecting the
system boiler to a 4-pipe system are
as follows:
• The DHW circuit operates indepen-
dently of the CH circuit
• Dual temperature control, which
means the CH circuit can be
operated on weather compensated
system (reduced flow temperature)
• Using the boilers temperature
cut-out device and integral diverter
valve to protect the cylinder from
overheating.