Viessmann VITODENS 100-W WB1B Series Installation And Service Instructions Manual page 30

Boiler Connections
Installation Examples
System Layout 3
Vitodens 100-W, WB1B 26, 35 with...
- DHW storage tank
- one heating circuit
AV
PRV
Fig. 27
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
accessory part.
See page 36 in this manual for details
on the low-loss header.
30
(continued)
4xpipe Ø
or 12" / 305 mm
Maximum Flow Rates
Model
∆ t
Output Btu/h
30º F rise (GPM) 5.5
35º F rise (GPM) 4.7
40º F rise (GPM) 4.2
TPV
WB1B 26 35
83,000 108,000
----
6.2
5.4
Legend
AV Air vent
PRV Pressure relief valve
TPV Temperature and pressure
relief valve
A
Vitodens 100-W gas-fired
condensing boiler
B
External boiler/DHW
controller (field supplied)
C
Heating circuit
D
Heating circuit pump
(field supplied)
E
DHW storage tank
F
DHW tank temperature
aquastat or sensor
G
DHW circulating pump
(field supplied)
H
Closely spaced tees,
4xpipe Ø or 12" / 305mm*
K
Expansion tank
L
Primary pump (boiler circuit,
field supplied)
*A low-loss header offers additional
benefits not provided by a pair of
closely spaced tees. Viessmann
strongly recommends and prefers the
use of a low-loss header over closely
spaced tees.
Please see page 36 for details.