Viessmann Multiple Vitodens Systems, WB2B 80/105 Vitodens System Manual

Cascade System Guide

for use by Viessmann representatives

5285 280 v1.0 08/2011

Read and save these instructions
for future reference.

Multiple V

itodens Systems

IMPORTANT

for Vitodens 200-W, WB2B 80/105 Series Boilers

Purpose of this Document

The cascade system guide is intended for Viessmann
representatives to provide general information regarding
components, assembly and wiring for various system
configurations using multiple WB2B 80/105 Vitodens
boilers.

This document is to be used for general information
only and maybe subject to change without notice. Some
products may not be exactly as illustrated.

For additional information or other system configurations,
contact the Viessmann commercial projects department.

Table of Contents

Cascade System Guide

IMPORTANT

All distribution manifold inline installations can not be free
standing and must be securely fastened to the floor and
the wall.

Wall mount or wall and floor installations must be capable
of supporting the weight of the boilers, distribution
manifold(s) and insulation.

Page

Cascade System Guide

Purpose of this Document............................................2

Wall Mounted Multiple Boilers (without manifold)............3

Multiple Boilers using a Distribution Manifold, LLH..........4

Standard 2 Boiler Distribution Manifold with LLH.......4

Standard 3 Boiler Distribution Manifold with LLH.......5

Standard 2x-2 Boiler Distribution Manifold with LLH...6

Boilers for Cascade System..........................................7

Pumps per Boiler with the Manifold System...................7

Control for Heating System Loop..................................8

Additional Mixing Valves..............................................8

Venting Systems........................................................8

Set-up for Cascade System with External 0-10V

Temperature Signal to the Boiler..............................9

Set-up for Cascade System with Vitocontrol-S...........10

Heating Circuit/Boiler Pumps......................................11

Vitocontrol-S, 1 High/1 Low Temp. Heating Circuit &

1 DHW Tank............................................................12

Coding................................................................12

Wiring.................................................................13

2

Vitocontrol-S, 1 High/2 Low Temp. Heating Circuit &

1 DHW Tank............................................................14

Coding................................................................14

Wiring.................................................................15

Vitocontrol-S, 1 High/3 Low Temp. Heating Circuit &

1 DHW Tank............................................................16

Coding................................................................16

Wiring.................................................................17

Vitocontrol-S, 1 High/1 Low Temp. Heating Circuit,

1 DHW Tank & External Snow Melt............................18

Coding................................................................18

Wiring.................................................................19

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Cascade System Guide

Wall Mounted Multiple Boilers (without manifold)

Using standard Viessmann components, a maximum of 4 same size boilers can be connected in a cascade system using
a LL distribution manifold or field piped system (as shown below).
For systems requiring more than 4 boilers a custom Viessmann control is required.

A low loss header must be installed between the primary
boiler circuit and secondary system circuit. The LLH must
be sized to accommodate the highest flow rate.

All supply and return pipes are field supplied.

For systems that do not use the LLDM (field piped
systems) the contractor must size the pump according to
the pressure drop of the piping and the pressure drop of
the boiler heat exchanger.

For a list of recommended heating circuit/boiler pumps
refer to page 11.

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Control options for cascade system not using LLDM.

Vitocontrol-S WB2B cascade control.
For systems up to 4 boilers of the same size, using KMK
bus communication between the Vitotronic HC1 boiler
control and the Vitocontrol-S WB2B cascade control.

System type Wall mounted

WB2B 80 WB2B916
WB2B 105 WB2B917

BMS or third party cascading controller
For systems up to 4 boilers of the same size, using

0-10VDC temperature signal between the Vitotronic 200
HO1 and the third party controller.

System type Wall mounted

WB2B 80 WB2B912
WB2B 105 WB2B913

3

Cascade System Guide

Multiple Boilers using a Standard Distribution Manifold and LLH

The following illustrations will show a 2, 3 and 4 multiple boiler configurations using standard 2 or 3 boiler distribution
manifolds. All low loss distribution manifold packages include a LLH.

Standard 2 Boiler Distribution Manifold with Low Loss Header (dimensions in. [mm])

(front view shown)

Part No. Z008 013 includes a 2 boiler distribution manifold, a low loss header and the necessary mounting hardware.
Part No. 7424 333 for manifold insulation (order separately if required, not shown).
Part No. 7424 336 for LLH insulation (order separately if required, not shown).

4

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Cascade System Guide

Multiple Boilers using a Standard Distribution Manifold and LLH (continued)

Standard 3 Boiler Distribution Manifold with Low Loss Header (dimensions in. [mm])

(front view shown)

Part No. Z008 014 includes a 3 boiler distribution manifold, a low loss header and the necessary mounting hardware.
Part No. 7424 334 for 3 boiler manifold insulation (order separately if required, not shown).
Part No. 7424 337 for LLH insulation (order separately if required, not shown).

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5

Cascade System Guide

Multiple Boilers using a Standard Distribution Manifold and LLH (continued)

Standard 2x - 2 Boiler Distribution Manifolds with Low Loss Header (dimensions in. [mm])

(front view shown)

Part No. Z008 015 includes 2x - 2 boiler distribution manifolds, a low loss header and the necessary mounting hardware.
Part No. 2x - 7424 333 for 2 boiler manifold insulation (order separately if required, not shown).
Part No. 7424 338 for LLH insulation (order separately if required, not shown).

6

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