VITODENS 200-W
Installation Instructions
for use by heating contractor
Vitodens 200-W, WB2B Series
Models 80, 105
Wall-mounted, gas-fired condensing boiler
For natural gas only
Heating input 104 to 370 MBH
30 to 108 kW
Read and save these instructions
for future reference.
IMPORTANT
This trademark is registered with the U.S. Patent and Trademark Office.
Please file in Service Binder
5418 910 v1.0 b1 08/2009
Safety, Installation and Warranty Requirements
2
Safety, Installation and Warranty Requirements
Please ensure that these instructions are read and understood before commencing installation. Failure to comply with the
instructions listed below 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).
Licensed professional heating
contractor
The installation, service, and
maintenance of this equipment must
be performed by a licensed
professional heating contractor.
"
Please see section
entitled “Important
Regulatory and
Installation
Requirements” in the
Installation Instructions.
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.
"
For a listing of
applicable literature,
please see section
entitled “Important
Regulatory and
Installation Requirements”
in the Installation Instructions.
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
professional service annually before
the heating season begins.
Carbon monoxide
Improper installation, service and/or
maintenance can cause flue products
to flow into living space. Flue
products contain poisonous carbon
monoxide gas.
"
For information
pertaining to the proper
installation, service and
maintenance of this
equipment to avoid
formation of carbon monoxide, please
see the Installation Instructions of the
Vitodens 200-W Venting System.
Equipment venting
Never operate boiler without an
installed venting system. An improper
venting system can cause carbon
monoxide poisoning.
Warranty
Information contained in
this and related product
documentation must be
read and followed. Failure
to do so renders warranty
null and void.
5418 910 v1.0 b1
Installers must follow local
regulations with respect to
installation of carbon monoxide
detectors. Follow manufacturer’s
maintenance schedule of boiler.
WARNING
Index
3
Page
General Information
Important Regulatory and Installation Requirements 5
...........................
About these Installation Instructions 8
...........................................................
Applicability 9
...........................................................................................................
Mechanical Room 10
................................................................................................
Set-up
Before Set-up 11
.........................................................................................................
Minimum Clearances 11
...........................................................................................
Boiler Connections
Preparing the Connections 12
..............................................................................
Connections overview 12
........................................................................................
Wall Mounting 14
......................................................................................................
Installing the wall mounting bracket 14
...........................................................
Mounting the boiler 16
.............................................................................................
Connections 17
...........................................................................................................
Connecting the power supply 17
.........................................................................
Boiler venting 17
........................................................................................................
Proper piping practice 17
.........................................................................................
Gas shut-off valve connection 17
......................................................................
Gas connection and piping 18
..............................................................................
Gas piping pressure test 19
...................................................................................
Heating water connections 20
.............................................................................
DHW storage tank information 21
.......................................................................
Making the DHW connections 21
........................................................................
Accessing the control unit cables 23
................................................................
Connecting DHW sensor 24
...................................................................................
High altitudes setting 24
.........................................................................................
Condensate connection 25
.....................................................................................
Safety Connections and Pressure Testing 26
.................................................
Installing boiler safety devices 26
......................................................................
Performing boiler pressure test 27
......................................................................
Installation Examples 28
.........................................................................................
Waterside flow (primary circuit) 29
....................................................................
System layout 1 30
...................................................................................................
System layout 2 31
...................................................................................................
System layout 3 32
...................................................................................................
System layout 4 33
...................................................................................................
System layout 5 34
...................................................................................................
System layout 6 35
...................................................................................................
System layout 7 36
...................................................................................................
System layout 8 37
...................................................................................................
System layout 9 38
...................................................................................................
Vitodens 200-W, WB2B (alternate DHW connection) 39
.........................
Boiler in heating/cooling application 40
.............................................................
Boiler with low water cut-off (remote-mounted, field supplied) 41
......
Venting Connection 41
............................................................................................
Index
4
Control Connections
Electrical Connections 42
.......................................................................................
Overview of electrical connections and plug-in connectors 42
.............
Connecting the Power/Pump module 42
.........................................................
Power/Pump module electrical connectors 44
..............................................
Boiler control board GC 131 electrical connectors 45
...............................
Connection between the Power/Pump module and boiler 46
.................
Accessories electrical connections 47
..............................................................
Accessing the X3 plug 48
.....................................................................................
Connecting the low-loss header sensor 48
.....................................................
Connecting the outdoor temperature sensor 49
..........................................
External switching of heating program/External heat demand/
External blocking 50
..................................................................................................
External 0-10 volt signal connection 50
...........................................................
Connecting the LON communication module 51
.........................................
Accessory kit connections for heating circuit with mixing valve 53
. .
Wiring diagram for the boiler / Power/Pump module 54
............................
Installing the Programming Unit of the Control Unit 55
............................
Closing the control unit and inserting the programming unit 55
...........
Reinstalling the front enclosure panel 55
.........................................................
Appendix
Technical Data 56
......................................................................................................
Wiring Diagram 58
......................................................................................................
Complete system wiring diagram 58
..................................................................
Lighting and Operating Instructions 60
............................................................
Ladder Diagram 61
....................................................................................................
5418 910 v1.0 b1
General Information
5
Important Regulatory and Installation Requirements
Codes
The installation of this unit shall be in
accordance with local codes or, in the
absence of local codes, use
CAN/CSA-B149.1 or .2 Installation
Codes for Gas Burning Appliances for
Canada. For U.S. installations use the
National Fuel Gas Code ANSI Z223.1.
Always use latest editions of codes.
In Canada all electrical wiring is to be
done in accordance with the latest
edition of CSA C22.1 Part 1 and/or
local codes. In the U.S. use the
National Electrical Code ANSI/NFPA
70. The heating contractor must also
comply with both the Standard for
Controls and Safety Devices for
Automatically Fired Boilers,
ANSI/ASME CSD-1, and the Installation
Code for Hydronic Heating Systems,
CSA B214-01, where required by the
authority having jurisdiction.
Instructing the system user
The installer of the system is
responsible to ensure the system
operator/ultimate owner is made
familiar with the system functioning,
its activation, and its shut-down.
Initial start-up
Initial start-up must be performed by a
qualified heating contractor. Proper
completion of the Maintenance Record
by the heating contractor is also
required.
Working on the equipment
The installation, adjustment, service,
and maintenance of this boiler must be
done by a licensed professional heating
contractor who is qualified and
experienced in the installation, service,
and maintenance of hot water boilers.
There are no user serviceable parts on
the boiler, burners, or control.
The following topics must be
covered:
Proper system operation sequence.
Explain the equipment.
Demonstrate an emergency
shut-down, what to do and what not.
Explain that there is no substitute for
proper maintenance to help ensure
safe operation.
The Maintenance Record is located in
the Start-up and Service Instructions.
Please carefully read this manual prior
to attempting start-up, maintenance
or service. Any warranty is null and
void if these instructions are not
followed.
For information regarding other
Viessmann System Technology
componentry, please reference
documentation of the respective
product.
We offer frequent installation and
service seminars to familiarize our
partners with our products. Please
inquire.
Ensure main power supply to
equipment, the heating system, and all
external controls has been deactivated.
Close main gas supply valve. Take
precautions in all instances to avoid
accidental activation of power during
service work.
The completeness and functionality of
field supplied electrical controls and
components must be verified by the
heating contractor. These include low
water cut-offs, flow switches (if used),
staging controls, pumps, motorized
valves, air vents, thermostats, etc.
Technical literature
Literature for the Vitodens boiler:
- Technical Data Manual
- Installation Instructions
- Start-up/Service Instructions
- Operating Instructions
and User’s Information Manual
- Instructions of other Viessmann
products utilized and installed
- Installation codes mentioned
in this manual
Leave all literature at the installation
site and advise the system
operator/ultimate owner where the
literature can be found. Contact
Viessmann for additional copies.
This product comes with several
safety instruction labels attached.
Do not remove!
Contact Viessmann immediately if
replacement labels are required.
5418 910 v1.0 b1
General Information
6
Important Regulatory and Installation Requirements
(continued)
Special Requirements for Side-Wall Vented Appliances
In the Commonwealth of Massachusetts
The Commonwealth of Massachusetts requires compliance with regulation 248 CMR 4.00 and 5.00 for installation of
side-wall vented gas appliances as follows:
(a) For all side-wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole
or in part for residential purposes, including those owned or operated by the Commonwealth and where the side-wall
exhaust vent termination is less than (7) feet above finished grade in the area of the venting, including but not limited to
decks and porches, the following requirements shall be satisfied:
1. INSTALLATION OF CARBON MONOXIDE DETECTORS. At the time of installation of the side-wall horizontal vented
gas fueled equipment, the installing plumber or gasfitter shall observe that a hard wired carbon monoxide detector
with an alarm and battery back-up is installed on the floor level where the gas equipment is to be installed. In
addition, the installing plumber or gasfitter shall observe that a battery operated or hard wired carbon monoxide
detector with an alarm is installed on each additional level of the dwelling, building or structure served by the
side-wall horizontal vented gas fueled equipment. It shall be the responsibility of the property owner to secure the
services of qualified licensed professional for the installation of hard-wired carbon monoxide detectors.
a. In the event that the side-wall horizontally vented gas fueled equipment is installed in a crawl space or an attic,
the hard-wired carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent
floor level.
b. In the event that the requirements of this subdivision can not be met at the time of completion of installation, the
owner shall have a period of thirty (30) days to comply with the above requirements; provided, however, that
during said thirty (30) day period, a battery operated carbon monoxide detector with an alarm shall be installed.
2. APPROVED CARBON MONOXIDE DETECTORS. Each carbon monoxide detector as required in accordance with the
above provisions shall comply with NFPA 720 and be ANSI/UL 2034 listed and IAS certified.
3. SIGNAGE. A metal or plastic identification plate shall be permanently mounted to the exterior of the building at a
minimum height of eight (8) feet above grade directly in line with the exhaust vent terminal for the horizontally vented
gas fueled heating appliance or equipment. The sign shall read, in print size no less than one-half (1/2) inch in size,
”GAS VENT DIRECTLY BELOW. KEEP CLEAR OF ALL OBSTRUCTIONS”.
4. INSPECTION. The state or local gas inspector of the side-wall horizontally vented gas fueled equipment shall not
approve the installation unless, upon inspection, the inspector observes carbon monoxide detectors and signage
installed in accordance with the provisions of 248 CMR 5.08(2)(a) 1 through 4.
(b) EXEMPTIONS: The following equipment is exempt from 248 CMR 5.08(2)(a) 1 through 4:
1. The equipment listed in Chapter 10 entitled ”Equipment Not Required To Be Vented” in the most current edition of
NFPA 54 as adopted by the Board; and
2. Product Approved side-wall horizontally vented gas fueled equipment installed in a room or structure separate from
the dwelling, building or structure used in whole or in part for residential purposes.
(c) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM PROVIDED. When the manufacturer of
Product Approved side-wall horizontally vented gas equipment provides a venting system design or venting system
components with the equipment, the instructions provided by the manufacturer for installation of the equipment and the
venting system shall include:
1. Detailed instructions for the installation of venting system design or the venting system components; and
2. A complete parts list for the venting system design or venting system.
5418 910 v1.0 b1
General Information
7
Important Regulatory and Installation Requirements
(continued)
Special Requirements for Side-Wall Vented Appliances
In the Commonwealth of Massachusetts (continued)
(d) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED. When the manufacturer of a
Product Approved side-wall horizontally vented gas fueled equipment does not provide the parts for venting the flue
gases, but identifies ”special venting systems”, the following requirements shall be satisfied by the manufacturer:
1. The referenced ”special venting system” instructions shall be included with the appliance or equipment installation
instructions; and
2. The ”special venting systems” shall be Product Approved by the Board, and the instructions for that system shall
include a parts list and detailed installation instructions.
(e) A copy of all installation instructions for all Product Approved side-wall horizontally vented gas fueled equipment, all
venting instructions, all parts lists for venting instructions, and/or all venting design instructions shall remain with the
appliance or equipment at the completion of the installation.
5418 910 v1.0 b1
General Information
8
About these Installation 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
presence of potential hazards or
important product information.
Cautions draw your attention to the
presence of potential hazards or
important product information.
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.
5418 910 v1.0 b1
Indicates an imminently hazardous
situation which, if not avoided, could
result in death, serious injury or
substantial product/property damage.
WARNING
Indicates an imminently hazardous
situation which, if not avoided, may
result in minor injury or
product/property damage.
CAUTION
IMPORTANT
General InformationGeneral Information
9
Applicability
When ordering replacement parts,
provide either the 16-digit serial
number (on the bar code label) or the
12-digit ASME/NB serial number,
located as shown underneath boiler
front enclosure panel. Refer to page 16
for instructions on how to remove front
enclosure panel.
Model No. WB2B 30-80
Serial No. 7374868 jjjjjjjjj
Model No. WB2B 30-105
Serial No. 7374869 jjjjjjjjj
Product Information
Natural gas-fired wall-mounted condensing heating boiler for weather-responsive
operation in closed loop, forced circulation hot water heating systems for space
heating and domestic hot water (DHW) production.
The Vitodens 200-W, WB2B series boiler comes factory set for operation with
natural gas.
Boiler model must be selected based on an accurate heat loss calculation of the
building. Ensure boiler model is compatible with connected radiation.
Vitodens 200-W, WB2B series boilers are factory-tested and calibrated. Further
gas valve adjustments are not typically required during field start-up.
See the Vitodens 200-W, WB2B
Start-up/Service Instructions.
.
5418 910 v1.0 b1
The boiler serial number must be
provided when ordering replacement
parts. Some replacement parts are
not reverse compatible with previous
versions of the Vitodens 200-W
WB2B boiler.
CAUTION
IMPORTANT
Fig. 1 Locating boiler serial numbers for ordering replacement parts
12-digit ASME/NB serial number
(located on metallic plate riveted
to the heat exchanger)
16-digit serial number on white
bar code label
5418 910 v1.0 b1
General Information
10
Mechanical Room
During the early stages of designing a new home, we recommend that proper consideration be given to constructing a
separate mechanical room dedicated to the gas- or oil-fired heating equipment and domestic hot water storage tank(s).
The boiler must be located in a heated indoor area, near a floor drain, and as close as possible to a wall. Whenever possible,
install the boiler near an outside wall so that it is easy to duct the venting system to the boiler.
Locate the boiler on a wall capable of supporting the weight of the boiler filled with water (see section entitled “Technical
Data” on page 56 for information required for total boiler weight calculation). Ensure that the boiler location does not
interfere with the proper circulation of combustion and ventilation air of other fuel burning equipment within the mechanical
room (if applicable).
The maximum room temperature of the mechanical room where the boiler is located must not exceed 104 ºF/40 ºC.
Installation area conditions
Ensure ambient temperatures are
higher than 32°F / 0°C and lower
than 104°F / 40°C.
Prevent the air from becoming
contaminated by halogenated
hydrocarbons (e.g. as contained in
paint solvents or cleaning fluids) and
excessive dust (e.g. through grinding
or polishing work). Combustion air for
the heating process, and ventilation
of the boiler room must be free of
corrosive contaminants. To that end,
any boiler must be installed in an area
that has no chemical exposure. The
list to the right indicates the main,
currently known sources.
Avoid continuously high levels of
humidity (e.g. through frequent
drying of laundry).
Never close existing ventilation
openings.
Sources of combustion and ventilation
air contaminants
Areas likely to contain contaminants:
New building construction
Swimming pools
Remodelling areas, hobby rooms
Garages with workshops
Furniture refinishing areas
Dry cleaning/laundry areas and
establishments
Auto body shops
Refrigeration repair shops
Metal fabrication plants
Plastic manufacturing plants
Photo processing plants
Beauty salons
Products containing contaminants:
Chlorine-type bleaches, detergents
and cleaning solvents found in
household laundry rooms
Paint and varnish removers
Hydrochloric acid, muriatic acid
Chlorine-based swimming pool
chemicals
Spray cans containing
chlorofluorocarbons
Chlorinated waxes and cleaners
Cements and glues
Refrigerant leaks
Calcium chloride used for thawing
Sodium chloride used for water
softening salt
Permanent wave solutions
Adhesives used to fasten building
products and other similar items
Antistatic fabric softeners used in
clothes dryers
Boiler operation in marine environments
(damp, salty coastal areas)
The service life of the boiler’s exposed
metallic surfaces, such as the casing
and fan housing, is directly influenced
by proximity to damp and salty marine
environments. In such areas, higher
concentration levels of chlorides from
sea spray, coupled with relative
humidity, can lead to degradation of
the exposed metallic surfaces
mentioned above. Therefore, it is
imperative that boilers installed in such
environments not be installed using
direct vent systems which draw
outdoor air for combustion. Such
boilers must be installed using room air
dependent vent systems; i.e. using
room air for combustion. The indoor air
will have a much lower relative
humidity and, hence, potential
corrosion will be minimized.
5418 910 v1.0 b1
Incorrect ambient conditions can lead
to damage to the heating system and
put safe operation at risk.
WARNING
If you notice fire coming from the
appliance, call the fire department
immediately! Do not attempt to
extinguish the fire unless qualified to
do so.
WARNING
Fire causes a risk of burns and
explosion!
H
HH
HShut down the boiler
H
HH
HClose fuel shut-off valves
H
HH
HUse a tested fire extinguisher,
class ABC.
WARNING
IMPORTANT
Set-up
11
Before Set-up
Before placing boiler in its installation
location, ensure all necessary
accessories are installed.
Minimum Clearances
Recommended minimum service clearances
For typical Vitodens installations, Viessmann
recommends installing the boiler with the clearances
shown in the illustration on the left.
The Vitodens 200-W, WB2B boiler is approved for
closet and alcove installation with the following
clearances to combustibles.
Table 1. Clearances
Top Front Rear Left Right Vent pipe
0 0 AL, CL 0 0 0 0
AL = Alcove
CL = Closet
See Vitodens 200-W WB2B
Venting System Installation Instructions
for details.
5418 910 v1.0 b1
The boiler must be installed in such
a way that gas ignition system
components are protected from
water (spraying, splashing, etc.)
during boiler operation and service.
CAUTION
Front
12”/305 mm
0”/mm
28”/700 mm
Side
0”/mm
Back
Side
Fig. 2 Recommended min. service clearances
Top15¾”/
400 mm
Note:
The Vitodens 200-W, WB2B boiler has passed the zero inches
vent clearance to combustibles testing requirements dictated by
the boiler Harmonized Standard ANSI Z21.13. CSA 4.9.2007
and therefore is listed for zero clearance to combustibles when
vented with a single-wall special venting system (AL-29-4C ma-
terial) or UL/ULC-listed CPVC gas vent material. The zero inches
vent clearance to combustibles for the Vitodens 200-W, WB2B
boiler supercedes the clearance to combustibles listing that ap-
pears on the special venting system label.
Boiler Connections
12
Preparing the Connections
Connections overview
Use an approved pipe sealant or teflon tape when connecting the following installation fittings.
This section constitutes an overview only! Refer to subsequent sections for detailed information on individual piping
connections.
Legend
BWR Boiler Water Return, 1¼” NPTF
BWS Boiler Water Supply, 1¼” NPTF
BD Boiler Drain
CD Condensate Discharge tubing,1”
GC Gas Connection, 1” NPTM
PRV Pressure Relief Valve
BF Boiler Fill
* G 1½” to 1¼” NPT adaptor
and gasket
5418 910 v1.0 b1
BWS BWR
CD
PRV
BD
} }
**
GC
BF
Fig. 3 Piping connections for Vitodens 200-W, WB2B 80, 105
Boiler Connections
13
Preparing the Connections
(continued)
Connections overview (continued)
Use an approved pipe sealant or teflon tape when connecting the following installation fittings.
This section constitutes an overview only! Refer to subsequent sections for detailed information on individual piping
connections.
Legend
PG Pressure Gauge
Reference point for top of
boiler
Vitodens 200-W boiler
Finished floor level
*1
Recommendation
When preparing gas, water
and electrical connections in
the field, see section entitled
“Wall Mounting” on page 14
of this manual for information
regarding the installation of
the wall mounting bracket.
The maximum ambient temperature
must not exceed 104 ºF / 40 ºC.
1. Heating water connections and gas
connection to be made in the field.
See illustration to the left and
connection-specific section for
details.
2. See subsection entitled “Power
supply connection” for details
regarding power supply to the
Vitodens 200-W WB2B boiler.
5418 910 v1.0 b1
78” / 1975 mm
for single boiler
installation
*1
Fig. 4 Piping connections for Vitodens 200-W, WB2B 80, 105
Front view Side view
min.12”
305 mm
480mm/
19”
240mm /
9½”
295mm / 11
5
/
8
“
for WB2B 80-105
using the coaxial
vent system
108mm /
4¼”
850mm /
33½”
1090mm /
43”
80mm / 3”
240mm / 9½”
400mm /
15¾”
165mm /
6½”
240mm /
9½”
PG
236mm /
9½”
102mm / 4”
530mm /21”
IMPORTANT
Boiler Connections
14
Wall Mounting
Installing the wall mounting bracket
Legend
Reference point for top of boiler
Mounting template
Finished floor level
Dimensions
a 19”/483 mm
b 78”/1975 mm
*1
Recommendation
The Vitodens 200-W WB2B can be
wall-mounted on
Ha brick/concrete wall
Hwood studs
Hmetal studs
Following are the installation
instructions for the mounting bracket
on each material. Skip to the
installation instructions applicable to
your installation requirements.
Installation of mounting bracket on
brick/concrete wall:
1. Drill holes (Ø
3
/
8
”/10 mm), using
mounting template supplied with the
boiler.
2. Align wall mounting bracket and
attach to wall with the screws and
bolts supplied.
5418 910 v1.0 b1
a
b*1
3
/
8
”/10 mm
2.
1.
Fig. 5
Whichever mounting method is used,
ensure that the bracket is tightly and
securely fastened to wall. Failure to
secure boiler properly could cause
boiler to loosen, posing a severe
safety hazard.
CAUTION
Boiler Connections
Fig. 6 General installation of mounting bracket
a
a = 16”/407 mm
Fig. 7 Installation of mounting bracket on wood studs
16”/407 mm
3/16”
2x
Fig. 8 Installation of mounting bracket on metal studs
5/8”
2x
16”/407 mm
15
Wall Mounting
(continued)
Installing the wall mounting bracket (continued)
Installation of mounting bracket on
wood and metal studs
To mount the Vitodens 200-W WB2B
boiler on wood or metal studs, install
mounting bracket on wall as shown in
Fig. 6.
Install mounting bracket on wood studs
as per Fig. 7.
Drill
3
/
16
” pilot holes to insert mounting
bolts.
Ensure that holes are located in the
center of each wood stud.
Install mounting bracket on metal studs
as per Fig. 8.
Drill
5
/
8
” pilot holes to insert mounting
bolts.
Ensure that holes are located in the
center of each metal stud.
Secure mounting bracket with bolts to
metal studs as shown below.
5418 910 v1.0 b1
Boiler Connections
16
Wall Mounting
(continued)
Mounting the boiler
1. To open hinged cover, lift cover A
and pivot control unit flap Bdown.
All boiler controls are located behind
the control unit flap.
2. Loosen the screws at the bottom of
the boiler; do not remove
completely.
3. Remove front enclosure panel (lift up
and pull towards you).
For installation of the
mounting bracket, see
“Wall mounting bracket
installation” on page 14
of this manual.
4. Mount boiler onto the mounting
bracket and connect boiler to the
installation fittings.
5418 910 v1.0 b1
2x
4.
3.
2.
Fig. 9
1.
Boiler Connections
17
Connections
Connecting the power supply
See Power/Pump
Module Installation
Instructions
The Vitodens 200-W boiler is shipped
with a Power/Pump module, which
requires a 120 VAC power supply
from a wall receptacle. The module
contains a 120/230 VAC step-up
transformer for 230 VAC operation.
Refer to the Installation Instructions
shipped with the module or those
contained in this manual for wiring
details (see page 54).
Boiler venting
The Vitodens 200-W WB2B boiler
comes with a pre-installed vent pipe
adaptor (as shown in fig. 10).
Run venting system, single-wall or
coaxial, through the side wall or the
roof, taking the shortest possible route
and at a rising angle (min. 3º).
See Installation Instructions
WB2B Venting System for
details.
Proper piping practice
Support piping by proper suspension
method. Piping must not rest on or be
supported by boiler.
Gas shut-off valve connection
1.Make gas connections in accordance
with codes CAN/CSA B149.1 and .2
or National Fuel Gas Code ANSI
Z223.1/NFPA 54,as well as local
codes.
2. Connect gas shutoff valve to the
boiler gas connection.
3. Once connected close gas shutoff
valve on boiler.
See following page for details on gas
connection and piping.
5418 910 v1.0 b1
Fig. 10
U
s
e
m
o
d
e
r
a
t
e
a
m
o
u
n
t
o
f
d
o
p
e
Leave 2 end threads bare
Thread pipe right length
2
i
m
p
e
r
f
e
c
t
t
h
r
e
a
d
s
Fig. 11 Pipe threads
Fig. 12 Gas valve connection
Gas
connection
Boiler Connections
18
Connections
(continued)
Gas connection and piping
Legend
Gas connection ∅1“ (NPT)
Accessible manual gas
shutoff valve
Ground joint union
Drip leg
1. Refer to current CAN/CSA B149.1
and .2 or National Fuel Gas Code
ANSI Z223.1/NFPA 54,as well as
local codes for gas piping
requirements and sizing. Pipe size to
the boiler must be determined based
on:
– pipe length
– number of fittings
– type of gas
– maximum input requirements of all
gas appliances in the residence.
Design piping layout in such a way that
piping does not interfere with
serviceable components.
2. Before connecting boiler to gas line,
install ground joint union, capped
drip leg and a manual equipment
shutoff valve as shown. Valves must
be listed by a nationally recognized
testing agency. Make boiler gas
connection as shown in Fig. 13.
3. Perform gas piping pressure test as
described in the following
subsection.
Max. gas supply pressure: 14 “w.c.
4. Identify shutoff valves as such with
a tab and familiarize
operator/ultimate owner of boiler
with these valves.
See Vitodens 200-W WB2B
Start-up/Service Instructions
for applicable system coding
information.
5418 910 v1.0 b1
Fig. 13 Gas pipe connections
5418 910 v1.0 b1
The gas supply piping must be leak
tested before placing the boiler in
operation.
WARNING
Ensure that gas piping is large
enough for all appliances in the
residence. No noticeable gas
pressure drop in the gas line must
occur when any unit (or combination
of units) lights or runs.
CAUTION
IMPORTANT
IMPORTANT
Boiler Connections
19
Connections
(continued)
Gas piping pressure test
When performing the gas piping pressure test, ensure the following requirements are met.
½ psig = 14 ”w.c.
1. Isolate the boiler from the gas supply
piping system using the individual
manual shutoff valve during pressure
tests equal to or less than ½ psig/
14 ”w.c.
2. The boiler and its individual shutoff
valve must be disconnected from the
gas supply piping system during any
pressure testing of that system at
test pressures in excess of
½ psig/14 ”w.c.
3. Perform leak test.
Use approved liquid spray solution
for bubble test. Ensure that no liquid
is sprayed on any electrical
components, wires or connectors.
Do not allow leak detection fluid to
contact gas valve regulator or
regulator vent opening.
4. Correct any and all deficiencies.
5. Remove air from gas line.
5418 910 v1.0 b1
Never check for gas leaks with an
open flame.
WARNING
Exposing boiler gas pressure
regulator and gas valve to extreme
pressures renders warranty null and
void.
WARNING
IMPORTANT
Boiler Connections
20
Connections
(continued)
Heating water connections
Legend
BD Boiler Drain
BF Boiler Fill
BWS Boiler Water Supply
BWR Boiler Water Return
GC Gas Connection
PRV Pressure Relief Valve
1. Thoroughly flush heating system
(particularly before connecting the
boiler to an existing system).
2. Connect boiler to the heating
system.
Max. operating
pressure 4 bar / 60 psig
........................
Test pressure 6 bar / 90 psig
..............
Damage resulting from pressure
exceeding those values stated is not
covered by Viessmann warranty.
5418 910 v1.0 b15418 910 v1.0 b1
PRV
GC
BD BF
Fig. 14
BWR
BWS
IMPORTANT
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