Viessmann VITODENS 200 WB2B Technical data

Brand: Viessmann

Model: VITODENS 200 WB2B

Category: Water heaters & boilers

Type: Technical data

This manual is also suitable for

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

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

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

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

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

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.

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

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

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

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

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!

HShut down the boiler

HClose fuel shut-off valves

HUse a tested fire extinguisher,

class ABC.

WARNING

IMPORTANT

Set-up

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

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

PRV

} }

Fig. 3 Piping connections for Vitodens 200-W, WB2B 80, 105

Boiler Connections

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

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

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

“

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”

236mm /

9½”

102mm / 4”

530mm /21”

IMPORTANT

Boiler Connections

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

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

”/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

b*1

”/10 mm

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 = 16”/407 mm

Fig. 7 Installation of mounting bracket on wood studs

16”/407 mm

3/16”

Fig. 8 Installation of mounting bracket on metal studs

5/8”

16”/407 mm

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

” 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

” 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

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

Fig. 9

Boiler Connections

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

Leave 2 end threads bare

Thread pipe right length

Fig. 11 Pipe threads

Fig. 12 Gas valve connection

Gas

connection

Boiler Connections

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

Boiler Connections

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

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

BD BF

Fig. 14

BWR

BWS

IMPORTANT

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Viessmann VITODENS 200 WB2B Technical data

Brand: Viessmann

Model: VITODENS 200 WB2B

Category: Water heaters & boilers

Type: Technical data

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