Viessmann Vitodens 100-W WB1B Series Installation And Service Instructions Manual page 40

Connections
Installation Examples
System Layout 3
Vitodens 100-W, WB1B 26, 35 with...
- DHW storage tank
- one heating circuit
AV
PRV
4xpipe Ø
or 12" / 305 mm
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 49 in this manual for details on the low-
loss header.
40
(continued)
TPV
Vitodens 100-W, WB1B Installation & Service
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, 4x pipe Ø or 12" (305 mm)*
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.
Maximum Flow Rates
Model WB1B
∆ t
Output Btu/h
30º F rise (GPM)
35º F rise (GPM)
40º F rise (GPM)
26 35
83,000 108,000
5.5 ----
4.7 6.2
4.2 5.4