Viessmann Vitodens 200-W 19 WB2B Series User manual

VITODENS 200-W
Installation Instructions
for use by heating contractor
Vitodens 200-W, WB2B Series
Models 19, 26, 35
Wall-mounted, gas-fired condensing boiler
For operation with natural gas and liquid propane gas
Heating input 31 to 125 M H
9 to 37 kW


Read and save these instructions
for future reference.
MPORTANT
This trademark is registered with the U.S. Patent and Trademark Office.
Please file in Service Binder
5369 297 v1.6 12/2011

Safety, Installation and Warranty Requirements
2
Safety, nstallation 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 00-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.
5369 297 v1.6
nstallers must follow local
regulations with respect to
installation of carbon monoxide
detectors. Follow manufacturer’s
maintenance schedule of boiler.
WARN NG

Table of Contents
3
Page
General nformation mportant Regulatory and nstallation Requirements 5
...........................
About these nstallation nstructions 7 ...........................................................
Applicability 8 ...........................................................................................................
Product nformation 8 ...........................................................................................
Mechanical Room 9 ................................................................................................
Set-up Before Set-up 10
.........................................................................................................
Minimum Clearances 10 ...........................................................................................
Boiler Connections Preparing the Connections 11
..............................................................................
Connections overview 11 ........................................................................................
Wall Mounting 13 ......................................................................................................
Installing the wall mounting bracket 13 ...........................................................
Mounting the boiler 15 .............................................................................................
Connections 16 ...........................................................................................................
Connecting the power supply 16 .........................................................................
oiler venting 16 ........................................................................................................
Proper piping practice 16 .........................................................................................
Gas shut-off valve connection 16 ......................................................................
Gas connection and piping 18 ..............................................................................
Gas piping pressure test 18 ...................................................................................
Heating water connections 19 .............................................................................
DHW storage tank information 20 .......................................................................
Making the DHW connections 20 ........................................................................
Accessing the control unit cables 22 ................................................................
Connecting DHW sensor 23 ...................................................................................
High altitudes setting 23 .........................................................................................
Condensate connection 24 .....................................................................................
Safety Connections and Pressure Testing 25 .................................................
Installing boiler safety devices 25 ......................................................................
Performing boiler pressure test 26 ......................................................................
nstallation Examples 27 .........................................................................................
Waterside flow (primary circuit) 28 ....................................................................
System layout 1 29 ...................................................................................................
System layout 2 30 ...................................................................................................
System layout 3 31 ...................................................................................................
System layout 4 32 ...................................................................................................
System layout 5 33 ...................................................................................................
System layout 6 34 ...................................................................................................
System layout 7 35 ...................................................................................................
System layout 8 36 ...................................................................................................
Vitodens 200-W, W 2 (alternate DHW connection) 37 .........................
oiler in heating/cooling application 38 .............................................................
oiler with low water cut-off (remote-mounted, field supplied) 39 ......
Venting Connection 39 ............................................................................................
5369 297 v1.6

Table of Contents
4
Control Connections Electrical Connections 40
.......................................................................................
Overview of electrical connections and plug-in connectors 40 .............
Connecting the Power/Pump module 40 .........................................................
Power/Pump module electrical connectors 42 ..............................................
oiler control board GC 130 electrical connectors 42 ...............................
Connection between the Power/Pump module and boiler 44 .................
Accessories electrical connections 45 ..............................................................
Accessing the X3 plug 46 .....................................................................................
Connecting the low-loss header sensor 46 .....................................................
Connecting the outdoor temperature sensor 47 ..........................................
External switching of heating program/External heat demand/
External blocking 48 ..................................................................................................
External 0-10 volt signal connection 48 ...........................................................
Connecting the LON communication module 49 .........................................
Accessory kit connections for heating circuit with mixing valve
part no. 7133392 (old version) 51 ....................................................................
Accessory kit connections for heating circuit with mixing valve
part no. 7837524 (new version) 52 ...................................................................
Wiring diagram for the boiler / Power/Pump module 53 ............................
nstalling the Programming Unit of the Control Unit 54 ............................
Closing the control unit and inserting the programming unit 54 ...........
Reinstalling the front enclosure panel 54 .........................................................
Additional nformation Technical Data 55
......................................................................................................
Wiring Diagram 57 ......................................................................................................
Complete system wiring diagram 57 ..................................................................
Lighting and Operating nstructions 59 ............................................................
Ladder Diagram 60 ....................................................................................................
5369 297 v1.6

General Information
5
mportant Regulatory and nstallation Requirements
Codes
The installation of this unit shall be in
accordance with local codes or, in the
absence of local codes, use
CAN/CSA- 149.1 or .2 Installation
Codes for Gas urning 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 oilers,
ANSI/ASME CSD-1, and the Installation
Code for Hydronic Heating Systems,
CSA 214-01, where required by the
authority having jurisdiction.
nstructing 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.
nitial 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.
5369 297 v1.6

General Information
6
mportant Regulatory and nstallation Requirements (continued)
For installations on the Commonwealth of Massachusetts, the following modifications to NFPA-54 chapter 10 apply:
Excerpt from 248 CMR 5-08:
2(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 CAR ON 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 CAR ON 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 ELOW. KEEP CLEAR OF ALL O STRUCTIONS”.
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 e Vented” in the most current edition of
NFPA 54 as adopted by the oard; 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.
5369 297 v1.6

General Information
7
About these nstallation nstructions
Take note of all symbols and notations intended to draw attention to potential hazards or important product information.
These include ”WARN NG”, ”CAUT ON”, and ” MPORTANT”. 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.
5369 297 v1.6
ndicates an imminently hazardous
situation which, if not avoided, could
result in death, serious injury or
substantial product/property damage.
WARN NG
ndicates an imminently hazardous
situation which, if not avoided, may
result in minor injury or
product/property damage.
CAUT ON
MPORTANT

General InformationGeneral Information
8
Applicability
When ordering replacement parts,
provide either the 16-digit boiler 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 15
for instructions on how to remove front
enclosure panel.
Model No. WB2B 19
Serial No. 7374863 jjjjjjjjj
Model No. WB2B 26
Serial No. 7374864 jjjjjjjjj
Model No. WB2B 35
Serial No. 7374865 jjjjjjjjj
Product nformation
Natural gas and liquid propane 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, W 2 series boiler comes factory set for operation with
natural gas. For a fuel conversion to liquid propane gas no conversion kit is
required.
oiler 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, W 2 series boilers are factory-tested and calibrated. Further
gas valve adjustments are not typically required during field start-up.
See the Vitodens 00-W, WB B
Start-up/Service Instructions.
.
5369 297 v1.6
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.
CAUT ON
MPORTANT
Fig. 1 Locating boiler serial numbers for ordering replacement parts
1 -digit ASME/NB serial number
(located on metallic plate riveted
to the heat exchanger)
16-digit boiler serial number
on white bar code label
labelled “Boiler Serial
Number” is also located on
the bottom of the boiler.
Stainless steel Inox-Radial
heat exchanger
5369 297 v1.6

General Information
9
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 54 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 104ºF / 40ºC.
nstallation 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
eauty 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.
5369 297 v1.6
ncorrect ambient conditions can lead
to damage to the heating system and
put safe operation at risk.
WARNING
f 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
MPORTANT

Set-up
10
Before Set-up
efore 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.
Note:
The 12” (305 mm) side clearance specified is only
recommended to be able to view the boiler certified
rating plate, decal and also accomodate the PRV
installation kit.
If the pressure relief valve is rotated 90º facing
forward by using an extension between the tee and
the boiler connection, then this clearance can be
reduced to b”. This b” clearance is only required to
be able to remove the boiler’s front cover and view
the rating plate attached to it, if needed.
This reduced clearance is also used in Vitodens
multiple boiler installation system as described in
the multiple boiler installation instructions.
The Vitodens 200-W, W 2 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 the Vitodens 00-W WB B Venting
System Installation Instructions for details.
5369 297 v1.6
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.
CAUT ON
Front
12”/305 mm
12”/305 mm
0”/mm
28”/700 mm
Side
0”/mm
ack
Side
Fig. Recommended min. service clearances
Top
Note:
The Vitodens 200-W, W 2 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
material) or UL/ULC-listed CPVC gas vent material. The zero
inches vent clearance to combustibles for the Vitodens 200-W,
W 2 boiler supercedes the clearance to combustibles listing
that appears on the special venting system label.

oiler Connections
11
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
R oiler Return ¾“ (NPT)
S oiler Supply ¾“ (NPT)
D oiler Drain
CD Condensate Discharge tubing
GC Gas Connection ¾“ (NPT)
PRV Pressure Relief Valve ¾“ (NPT)
F oiler Fill
PG Pressure Gauge
EXT Extension Adaptors, ¾“ (NPT)
5369 297 v1.6
S R
CD
PRV
D GC F
Fig. 3 Piping connections for Vitodens 00-W, WB B 19, 6, 35
PG
EXT
EXT

oiler Connections
12
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
AV Air Vent (inside the boiler)
Reference point for top of boiler
Vitodens 200-W, W 2 boiler
Finished floor level
When preparing gas, water
and electrical connections in
the field, see section entitled
“Wall Mounting” on page 13
of this manual for information
regarding the installation of
the wall mounting bracket.
The maximum ambient temperature
must not exceed 104ºF / 40ºC.
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 W 2 boiler.
5369 297 v1.6
17¾” /
450 mm
AV
Fig. 4 Piping connections for Vitodens 00-W, WB B 19, 6, 35
6¼” / 158 mm
80¾” /
2053 mm
55/8” /
143 mm
1¾” /
44 mm
141/8” /
360 mm
2¾” /
70 mm
2½” /
65 mm
7” / 177 mm
13¾” /
348 mm
87/8” / 225 mm
4” / 102 mm
4” / 102 mm
33½” /
850 mm
12” /
305 mm
2¾” /
70 mm
MPORTANT

oiler Connections
13
Wall Mounting
nstalling 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
*1Recommendation
The Vitodens 200-W W 2 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.
nstallation 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.
5369 297 v1.6
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.
CAUT ON

oiler 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
14
Wall Mounting (continued)
nstalling the wall mounting bracket (continued)
nstallation of mounting bracket on
wood and metal studs
To mount the Vitodens 200-W W 2
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.
5369 297 v1.6

oiler Connections
15
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” on
page 14 of this manual.
4. Mount boiler onto the mounting
bracket and connect boiler to the
installation fittings.
5369 297 v1.6
2x
2.
Fig. 9
3.
4.
1.

oiler Connections
16
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 52).
Boiler venting
The Vitodens 200-W W 2 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
WB B 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 149.1 and .2
or National Fuel Gas Code ANSI
Z223.1/NFPA 54,as well as local
codes.
2. Connect the extension and the 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.
5369 297 v1.6
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
2
i
m
p
e
r
f
e
c
t
t
h
r
e
a
d
s
Fig. 11 Pipe threads
Fig. 1 Gas valve connection
Gas
connection

oiler Connections
17
Connections (continued)
Gas connection and piping
Legend
Gas connection ∅¾“ (NPT)
Accessible manual gas
shutoff valve
Ground joint union
Drip leg
1. Refer to current CAN/CSA 149.1
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. efore 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 00-W WB B
Start-up/Service Instructions
for applicable system coding
information.
5369 297 v1.6
Fig. 13 Gas pipe connections
5369 297 v1.6
The gas supply piping must be leak
tested before placing the boiler in
operation.
WARN NG
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.
CAUT ON
MPORTANT
MPORTANT

oiler Connections
18
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.
5369 297 v1.6
Never check for gas leaks with an
open flame.
WARN NG
Exposing boiler gas pressure
regulator and gas valve to extreme
pressures renders warranty null and
void.
WARN NG
MPORTANT

oiler Connections
19
Connections (continued)
Heating water connections
Legend
AV Air Vent (inside boiler)
D oiler Drain
F oiler Fill
PRV Pressure Relief Valve
WS oiler Water Supply
WR oiler Water Return
1. Thoroughly flush heating system
(particularly before connecting the
boiler to an existing system).
2. Connect boiler to the heating
system.
Max. operating
pressure 3 bar / 45 psig
........................
Test pressure 4 bar / 60 psig ..............
Damage resulting from pressure
exceeding those values stated is not
covered by Viessmann warranty.
5369 297 v1.65369 297 v1.6
AV
PRV
D F
Fig. 14
WR
WS
MPORTANT

oiler Connections
20
Connections (continued)
DHW storage tank information
The DHW water tank sensor is required when using a stand-alone DHW storage
tank with the Vitodens 200-W W 2 heating boiler. It comprises the sensor only
required for the connection of a stand-alone tank. All other required piping
connections are field supplied.
See Vitodens 00-W WB B
Start-up/Service Instructions
for applicable system coding
information.
Making the DHW connections
1. Connect field supplied nipples and
tees as shown for DHW supply and
return.
Apply sufficient amount of thread
sealant (supplied) when making the
connections.
*1 When using a low loss header in the
system, the DHW connections can
be made downstream of the low loss
header. See page 37 for a general
layout of the DHW piping. See
Vitodens 00-W WB B Start-up/Service
Instructions for applicable system
coding information (see coding level
00: ...
A : ...
5b: ...
Legend
DR oiler heating return for domestic
hot water production ¾“ (field
supplied)
DS oiler heating supply for domestic
hot water production ¾“ (field
supplied)
WS oiler Water Supply
WR oiler Water Return
5369 297 v1.6
2x
connections
(field supplied)
1.
Fig. 15
DS DR
DHW*1
WR
WS
MPORTANT