Viessmann VITODENS 100-W WB1B Series Installation And Service Instructions Manual page 29

Installation Examples
System Layout 2
Vitodens 100-W, WB1B 26, 35 with...
- DHW storage tank
- low-loss header
- one heating circuit
AV
PRV
Fig. 26
IMPORTANT
Primary pump L must pump into
the boiler (as illustrated).
Note:
The use of a low-loss header is
recommended if the water flow rate is
less than 1.7 GPM / 400 L/h or more
than 6.2 GPM / 1400 L/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)
TPV
Maximum Flow Rates
Model WB1B 26
∆ t
Output Btu/h
30º F rise (GPM) 5.5
35º F rise (GPM) 4.7
40º F rise (GPM) 4.2
Legend
AV
PRV
TPV
A
B
C
D
E
F
G
H
K
L
35
83,000 108,000
----
6.2
5.4
Boiler Connections
Air vent
Pressure relief valve
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
29