Installation, Start-up and
Service Instructions
for use by heating contractor
Vitocontrol-S, WB2
Master control for
up to four gas-fired wall-mounted boilers
Vitodens 200, WB2-44 or -60
Please file in Service Binder
VITOCONTROL-S, WB2
IMPORTANT
Read and save these instructions
for future reference.
5285 781 v1.5 11/2007
Certified as a component part
of Viessmann boilers only
Safety, installation and warranty requirements
Please ensure that this manual is read and understood before commencing installation. Failure to comply with the issues listed be-
low and details printed in this manual can cause product/property damage, severe personal injury, and/or loss of life. Ensure all
requirements below are understood and fulfilled (including detailed information found in manual subsections).
H Licensed professional heating
contractor
The installation, adjustment, service,
and maintenance of this equipment
must be performed by a licensed professional heating contractor.
"
Please see section
entitled “Important
Regulatory and
Installation Requirements”.
H Product documentation
Read all applicable documentation before commencing installation. Store
documentation near boiler in a readily
accessible location for reference in the
future by service personnel.
H Advice to owner
Once the installation work is complete,
the heating contractor must familiarize
the system operator/ultimate owner
with all equipment, as well as safety
precautions/requirements, shut-down
procedure, and the need for profession al service annually before the heating
season begins.
H Warranty
Information contained in this and related p roduct documentation must be
read and followed. Failure to do so ren-
ders warranty null and void.
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5285 781 v1.5
General Information
Index
Content Page
General Information 3
Terminology 3................................................................................................................................................................................................................
Safety 4...............................................................................................................................................................................................................................
Important regulatory and installation requirements 4............................................................................................................................
About these instructions 4.......................................................................................................................................................................................
Installation 5......................................................................................................................................................................................................................
Control panel connections 5....................................................................................................................................................................................
Outdoor temperature sensor 7...............................................................................................................................................................................
Common supply temperature sensor (strap-on sensor) 7....................................................................................................................
Installation Example 9..................................................................................................................................................................................................
Multiple Vitodens 200 Installation 9..................................................................................................................................................................
Plug-in connections 10..................................................................................................................................................................................................
Troubleshooting 11..........................................................................................................................................................................................................
General faults 11..............................................................................................................................................................................................................
Faults on display panel 12..........................................................................................................................................................................................
Faults displayed in the “Faults” menu 12.........................................................................................................................................................
Technical Specifications 13........................................................................................................................................................................................
Sensor resistance chart 13........................................................................................................................................................................................
Technical data 13..............................................................................................................................................................................................................
.................................................................................................................................................................................................
Internal Wiring Diagram 14.........................................................................................................................................................................................
Terminology
The terminology used by the Cascade Control of the Vitocontrol-S may not always coincide with the terms
used in the North American market.
The following is a cross-reference chart between the terms used by the control and corresponding, more
commonly used, terms of the North American heating industry.
Term used by control
Flow Supply
Frost protection Freeze-up protection
Outside temperature Outdoor temperature
Desired Setpoint temperature
Time clock Timer
North American term
5285 781 v1.5
3
Safety
Important regulatory and installation requirements
Power supply
Install power supply in accordance with
the regulations of the authorities having jurisdiction or, in the absence of
such requirements, in accordance with
National Codes.
External “potential-free” contacts to
the Cascade Control
Ensure that all contacts have sufficient
insulation clearance to live parts and
are certified for these applications.
Working with an open control
No static discharge to the internal componentry must ever occur when working with opened control equipment.
About these instructions
Take note of all symbols and notations intended to draw attention to potential hazards or important product information.
These include ”WARNING”, ”CAUTION”, and ”IMPORTANT”. See below.
Warnings draw your attention to the
WARNING
Indicates an imminently hazardous
situation which, if not avoided, could
result in death, serious injury or
substantial product/property damage.
CAUTION
Indicates an imminently hazardous
situation which, if not avoided, may
result in minor injury or
product/property damage.
presence of potential hazards or important product information.
Cautions draw your attention to the
presence of potential hazards or important product information.
IMPORTANT
Helpful hints for installation, operation or maintenance which pertain to
the product.
This symbol indicates that additional,
pertinent information is to be found in
column three.
This symbol indicates that other instructions must be referenced.
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5285 781 v1.55285 781 v1.55285 781 v1.5
Installation
Control panel connections
The Vitocontrol-S, WB2 control panel houses a Viessmann Cascade Control for use with up to four Vitodens
200, WB2-44 or WB2-60 wall-mounted condensing boilers.
Power supply
The panel is powered by 120 VAC, 60 Hz from the wall receptacle.
Fuses
Once the power switch is turned to ON, voltage is supplied to fuses F1 and F2.
Fuse F1 (0.063 A slow blow) protects the transformer.
Fuse F2 (6.3 A slow blow) protects the pump output.
IMPORTANT
Fuses F1 and F2 are time delay type and
should not be replaced with any other type.
Pump connection
Provisions have been made for one system supply pump to terminate inside the control panel.
This output is rated to a maximum current of 6.3 FLA. A single 6.3 A fuse protects this pump output against
over-current condition of the pump.
Cascade control
Within the control panel, the Cascade Control is powered by a 120 VAC/12 VAC transformer. The maximum
power consumption is 4 VA.
Relays R1 and R2
Along with the Cascade Control, two internal control relays are powered by the 12 VAC transformer. Relay R1
controls the operation of the system supply pump. Relay R2 provides a dry contact alarm output for a compiled
failure alarm.
5285 781 v1.55285 781 v1.5
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