Viessmann Vitodens 100-W WB1B Series Installation And Service Instructions Manual page 46

Vitodens 100-w wb1b series wall-mounted, gas-fired condensing boiler with optional on demand hot water combiplus kit
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Connections
Installation Examples
Vitodens 100-W, WB1B 10-26, 10-35 with CombiPLUS
and one heating circuit without LLH
Legend
AV
Air vent
PRV Pressure relief valve (boiler)
PRV* Pressure relief valve (DHW 150 psi)
WSE Water softner equipment
A
Vitodens 100-W gas-fired condensing boiler
B
External system controller (field supplied)
C
Heating circuit
D
Heating circuit pump (field supplied)
E
CombiPLUS
F
Closely spaced tees, 4x pipe Ø or 12" (305 mm)*
G
Expansion tank
* 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.
See page 49 for details.
46
(continued)
Vitodens 100-W, WB1B Installation & Service
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.
Maximum Flow Rates
Model WB1B
∆ t
Output Btu/h
30° F rise (GPM)
35° F rise (GPM)
40° F rise (GPM)
26
35
83,000
108,000
5.5
---
4.7
6.2
4.2
5.4

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