Viessmann VITODENS 100-W Installation And Service Instructions Manual page 29

Installation Examples
System Layout 2
Vitodens 100-W, WB1B 10-26, 10-35 with...
– DHW storage tank
– low-loss header
– one heating circuit
PRV
Y
Fig. 26
IMPORTANT
Primary pump must pump into
the boiler (as illustrated).
Please note!
The use of a low-loss header is
recommended if the water flow rate is
less than 1.7 GPM / 400 ltr/h or more
than 6.2 GPM / 1400 ltr/h.
The low-loss header is available as an
accessory part.
See page 36 in this manual for details
on the low-loss header.
(continued)
AV
Maximum Flow Rates
Model WB1B
∆ ∆ ∆ ∆ t
Output Btu/h
30ºF rise (GPM)
35ºF rise (GPM)
40ºF rise (GPM)
TPV
Y
10-26 10-35
83,000 108,000
5.5 ----
4.7 6.2
4.2 5.4
Boiler Connections
AV Air vent
PRV Pressure relief valve
TPV Temperature and pressure relief
valve
Vitodens 100-W gas-fired
condensing boiler
External boiler/DHW controller
(field supplied)
Heating circuit
Heating circuit pump
(field supplied)
DHW storage tank
DHW tank temperature aquastat or
sensor
DHW circulating pump (field
supplied)
Low-loss header
Expansion tank
Primary pump (boiler circuit, field
supplied) with low-loss header only
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