Viessmann Vitodens 100-W WB1C User Manual

Note on installation
for heating engineers
System boiler wiring instructions
for Vitodens 100-W, Typ WB1B & Typ WB1C
The Vitodens 100-W system boiler
offers several installation alterna-
tives.
From traditional 'Y' or 'S' plan
(2-pipe system) to weather compen-
sated 4-pipe system connected to an
un-vented DHW cylinder using the
integral expansion vessel and diverter
valve.
The advantages of connecting the
system boiler to a 4-pipe system are
as follows:
• The DHW circuit operates indepen-
dently of the CH circuit
• Dual temperature control, which
means the CH circuit can be
operated on weather compensated
system (reduced flow temperature)
• Using the boilers temperature
cut-out device and integral diverter
valve to protect the cylinder from
overheating.
5414 394 8/2009/14

Viessmann Vitodens 100-W WB1C Specifications

General

Type	Wall-mounted gas condensing boiler
Energy Efficiency Class	A
Max. Heat Input	35 kW
Heat Exchanger Material	Stainless steel
Control Unit	Vitotronic 100
Temperature Range	30°C to 85°C
Efficiency	Up to 98%
Fuel Type	Natural gas
Dimensions	400 x 700 x 360 mm
Water Pressure	Max 3 bar
Control	Weather-compensated control
Warranty	2 years (extendable)

Summary

System Boiler Wiring Instructions

Introduction and System Overview

Introduces the Vitodens 100-W system boiler and its installation alternatives, highlighting 4-pipe system advantages.

Option 1: 4-pipe system using an un-vented cylinder

System Description and Notes for Option 1

Details the 4-pipe system with an un-vented cylinder, including recommended coil output and DHW priority.

Electrical Wiring Example for Option 1 (Existing Programmer)

Provides an electrical wiring example for Option 1 with an existing CH/DHW programmer.

Electrical Wiring Example for Option 1 (Vitotrol/Room Thermostat)

Illustrates electrical wiring for Option 1 using Viessmann Vitotrol 100 or standard room thermostats.

Option 2: 4-pipe system with open vented cylinder

System Description and Notes for Option 2

Details the 4-pipe system with an open vented cylinder or Vitocell unvented cylinder, including coil output and primary circuit.

Electrical Wiring Example for Option 2

Provides an electrical wiring example for Option 2, explaining terminal connections and secondary controls.

Option 3: Traditional 'Y' or 'S'-plan system (2-pipe)

System Description and Notes for Option 3

Describes the traditional 'Y' or 'S'-plan 2-pipe system and notes on factory-fitted components.

Electrical Wiring Example for S-plan System

Illustrates the electrical wiring example for an S-plan system with the Vitodens 100-W boiler.