Viessmann B2TB004 User manual

Please file in Service Binder
for use by heating contractor
5461 889 - 16 01/2019
Installation Instructions
Vitodens 222-F, B2TB
Models 19, 35, 68, 125
Floor mounted, gas-fired condensing storage combi boiler
For operation with natural gas and liquid propane gas
Heating input: 12 to 125 MBH
3.5 to 37 kW
VITODENS
r
222-F
Read and save these instructions
for future reference.
Product may not be exactly as shown
IMPORTANT
H

5461 889 - 16
2
Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
2
Safety
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).
WARNING
Installers must follow local regulations with respect to
installation of carbon monoxide detectors. Follow the
Viessmann maintenance schedule of the boiler contained
in this manual.
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”.
Warranty
Information contained in this and
related product documentation must
be read and followed. Failure to do
so renders the warranty null and void.
Licensed professional heating contractor
The installation, adjustment, service and maintenance
of this equipment must be performed by a licensed
professional heating contractor.
Please see section entitled
“Important Regulatory and Installation
Requirements”.
Contaminated air
Air contaminated by chemicals can cause by-products
in the combustion process, which are poisonous to
inhabitants and destructive to
Viessmann equipment.
For a listing of chemicals which
cannot be stored in or near the
boiler room, please see subsection
entitled “Mechanical room” 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, shutdown procedure, and
the need for professional service annually before the
heating season begins.
Carbon monoxide
Improper installation, adjustment, 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, adjustment, service
and maintenance of this equipment to
avoid formation of carbon monoxide,
please see subsection entitled
“Mechanical room” and “Venting requirements”
in the “Venting System Installation Instructions”.
Fresh air
This equipment requires fresh air for
safe operation and must be installed
ensuring provisions for adequate
combustion and ventilation air exist.
For information pertaining to the
fresh air requirements of this product,
please see subsection entitled
“Mechanical room” in the “Installation
Instructions”.
Equipment venting
Never operate boiler without an installed venting
system. An improper venting system can cause
carbon monoxide poisoning.
For information pertaining to
venting and chimney requirements,
please see section entitled “Venting
Connection”. All products of
combustion must be safely vented
to the outdoors.
Operating and Service Documentation
It is recommended that all product documentation such as
parts lists, operating and service instructions be handed
over to the system user for storage. Documentation is to
be stored near boiler in a readily accessible location for
reference by service personnel.
WARNING
This boiler requires fresh air for safe operation and must
be installed with provisions for adequate combustion
and ventilation air (in accordance with local codes and
regulations of authorities having jurisdiction).
Do not operate this boiler in areas with contaminated
combustion air. High levels of contaminants such as
dust, lint or chemicals can be found at construction
sites, home renovations, in garages, workshops, in dry
cleaning/laundry facilities, near swimming pools and in
manufacturing facilities.
Contaminated combustion air will damage the boiler
and may lead to substantial property damage, severe
personal injury and/or loss of life. Ensure boiler/burner is
inspected and serviced by a qualified heating contractor
at least once a year in accordance with the Service
Instructions of the boiler.

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5461 889 - 16
Vitodens 222-F, B2TB 19, 35, 68, 125 Installation Safety
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.
IMPORTANT
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.
This symbol indicates that other instructions must
be referenced.
WARNING
Indicates an imminently hazardous situation which,
if not avoided, could result in loss of life, serious injury
or substantial product/property damage.
CAUTION
Indicates an imminently hazardous situation which,
if not avoided, may result in minor injury or product/
property damage.
Safety, Installation and Warranty Requirements (continued)
WARNING
Inhaling of fiberglass wool and/or ceramic fiber
materials is a possible cancer hazard. These materials
can also cause respiratory, skin and eye irritation.
Fiberglass wool and ceramic fiber materials
WARNING
Appliance materials of construction, products of
combustion and the fuel contain alumina, silica, heavy
metals, carbon monoxide, nitrogen oxides, aldehydes
and/or other toxic or harmful substances which can
cause serious injury or loss of life and which are
known to the State of California to cause cancer,
birth defects and other reproductive harm. Always
use proper safety clothing, respirators and equipment
when servicing or working nearby the appliance.
The state of California has listed the airborne fibers of
these materials as a possible cancer hazard through
inhalation. When handling these materials, special care
must be applied.
First aid measures
- If eye contact occurs, flush eyes with water to remove
dust. If symptoms persist, seek medical attention.
- If skin contact occurs, wash affected areas gently
with soap and warm water after handling.
Suppliers of fiberglass wool products recommend the
following precautions be taken when handling these
materials:
- Avoid breathing fiberglass dust and contact with
skin and eyes.
- Use NIOSH approved dust/mist respirator.
- Wear long-sleeved, loose fitting clothing, gloves
and eye protection.
- Wash work clothes separately from other clothing.
Rinse washer thoroughly.
- Operations such as sawing, blowing, tear-out and
spraying may generate airborne fiber concentration
requiring additional protection.
Suppliers of ceramic fiber products recommend the
following first aid measures:
- Respiratory tract (nose and throat) irritation:
If respiratory tract irritation develops, move the person
to a dust free location.
-Eye irritation: If eyes become irritated, flush immediately
with large amounts of lukewarm water for at least 15
minutes. Eyelids should be held away from the eyeball
to ensure thorough rinsing. Do not rub eyes.
- Skin irritation: If skin becomes irritated, remove soiled
clothing. Do not rub or scratch exposed skin. Wash area
of contact thoroughly with soap and water. Using
a skin cream or lotion after washing may be helpful.
- Gastrointestinal irritation: If gastrointestinal tract
irritation develops, move the person to a dust free
environment.

Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
Table of Contents
4
Page
5461 889 - 16
Safety, Installation and Warranty Requirements..............2
Product documentation.............................................2
Warranty................................................................2
Licensed professional heating contractor....................2
Contaminated air....................................................2
Advice to owner......................................................2
Carbon monoxide.....................................................2
Fresh air................................................................2
Equipment venting...................................................2
About these Installation Instructions.............................3
Important Regulatory and Installation Requirements........6
Codes.......................................................................6
Instructing the system user......................................6
Initial start-up..........................................................6
Working on the equipment.......................................6
Technical literature..................................................6
Flow switch procedure........................................... 7
Applicability..............................................................8
Product Information....................................................8
Mechanical Room.....................................................9
Before Set-up........................................................10
Minimum Clearances.................................................10
Recommended minimum service clearances..............10
Connections............................................................11
Boiler venting........................................................13
Connecting power..................................................13
Connecting heating system.....................................13
Proper piping practice.............................................13
Gas shut-off valve connection.................................14
Gas connection and piping......................................14
Gas piping pressure test.........................................15
Flue gas connection...............................................15
Removing the front panels......................................16
Accessing the control unit connections.....................17
External accessory connection box..........................20
Boiler control base.................................................21
Condensate connection........................................22
Vertical Piping Installation..........................................23
Side Piping Installation..............................................26
Installing boiler safety devices.................................28
Safety
General Information
Set-up
Boiler Connections

Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
5
Page
Table of Contents
5461 889 - 16
Boiler Connections (continued)
Control Connections
Additional Information
Safety Connections...................................................29
Low water cut-off..................................................29
Waterside Flow........................................................30
Waterside flow (primary circuit)...............................30
Installation Examples.................................................31
System Layout 1-8...................................................32
Alternative Connection............................................40
Wiring Diagram........................................................41
Electrical Connections..............................................43
Power supply connection of accessories...................43
Connection of accessories.......................................43
Accessories Connection............................................44
Connection of accessories.......................................44
Low voltage plug X3..............................................44
Accessing the X3 Plug..............................................45
Connecting the Low-loss Header Sensor......................45
Connecting the Outdoor Temperature Sensor..............46
LON Module..........................................................47
Installing the LON module to the boiler
control board.........................................................47
Connecting the LON module cable...........................47
Routing the Connecting Cables...................................48
External 0-10 Volt Signal Connection.........................49
Connecting a 24 VAC Thermostat ..............................50
Zone Circuit Thermostat Connections .........................51
Zone Circuit Pump Connection ...................................52
Connection to boiler............................................ 52
Connection at AMI (accessory)..............................52
Accessory Kit..........................................................53
Closing the Boiler....................................................53
Closing the External Accessory Connection Box............54
Reinstalling the Front Enclosure Panel..........................55
Fitting the front panels...........................................55
Technical Data.........................................................56
Installation Fittings....................................................58
Lighting and Operating Instructions.............................59

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Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
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.
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 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 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.
Technical literature
Literature for the Vitodens boiler:
- Technical Data Manual
- Installation Instructions
- Service Instructions
- Operating Instructions and User’s Information Manual
- Instructions of other Viessmann products utilized and
installed
- Installation codes mentioned in this manual
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.
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.

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Vitodens 222-F, B2TB 19, 35, 68, 125 Installation General Information
Important Regulatory and Installation 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 CARBON MONOXIDE DETECTORS. At the time of installation of the side-wall horizontal vented gas
fueled equipment, the installing plumber or gas fitter 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 gas fitter 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.
CSD-1 Field Testing of High Limit Switches for Vitodens boilers – where required by law.
VIESSMANN IS NOT RESPONSIBLE FOR ANY DAMAGES THAT THE FOLLOWING TEST PROCEDURE MAY RESULT
IN BY OVERHEATING THE SYSTEM.
The Vitodens 200/222 boilers are equipped with flow switches or sensors that when activated enable the burner to operate.
The fixed high limit, when tripped, produces a fault that will require manual reset of the boiler control.
Fixed High Limit fault simulation #1:
- Close the boiler valve and jumper across the flow switch.
- Run the boiler at high fire and it will shut down by the coding card (in B2TB models, set coding address 06 to
maximum) but should continue to steady increase the boiler temperature until the fixed high limit is tripped.
- Once the fixed high limit is tripped, slowly open the boiler valve to safely cool the boiler down.
Fixed High Limit fault simulation #2:
- Throttle the boiler valve to a point where the burner will run with as little flow as possible.
- Run the boiler to high fire via relays test.
- When the burner shuts down on the electronic limit, close the ball valve to stop the flow.
- The boiler temperature should continue a steady increase to trip the fixed high limit.
- Once the fixed high limit is tripped, slowly open the boiler valve to safely cool the boiler down.
Fixed High Limit fault simulation #3:
- Remove one of the wires connected to limit switch, this will produce a fault in the boilers control that requires
manual reset.
Flow switch procedure:
The Vitodens 222 B2TB boilers are equipped with a flow sensing device. Upon detection of an inadequate flow rate, the
switch will open and the burner will shut down and will prevent restart until an adequate flow rate is restored. To test the
sensing device, throttle down the flow of water to or from the boiler. The boiler will shut down once the flow has dropped
below it’s safe operating set point.

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Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
Applicability
General Information
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 16
for instructions on how to remove front enclosure panel.
Model No. B2TB 19,68
Serial No. 7542250 jjjjjjjjj
Model No. B2TB 35, 125
Serial No. 7542251 jjjjjjjjj
Product Information
CAUTION
The boiler serial number must be provided when ordering
replacement parts.
IMPORTANT
AStainless steel Inox-Radial heat exchanger for high
operational reliability, a long service life and high
heating output in the smallest space
BModulating MatriX cylinder gas burner for extremely
clean combustion
CIntegral diaphragm expansion vessel
DGraphical user interface
EIntegral, 3-speed high efficiency circulation pump
FStainless steel DHW primary storage tank.
Natural gas and liquid propane gas-fired 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 222-F, B2TB boiler comes factory
set for operation with natural gas. For a fuel conversion
to liquid propane gas no conversion kit is required.
The integral primary storage tank 26.5 USG (100 L)
capacity offers the DHW convenience of a separate DHW
tank with approximately twice that volume.
Boiler model must be selected based on an accurate heat
loss calculation of the building. Ensure boiler model is
compatible with connected radiation.
Follow the Vitodens Venting System
Installation Instructions to vent this boiler.
Vitodens 222-F, B2TB boilers are factory-tested and
calibrated. Further gas valve adjustments are not typically
required during field start-up.

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Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
Mechanical Room
General Information
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.
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).
HEnsure ambient temperatures are higher than 32°F
(0°C) and lower than 104°F (40°C).
HPrevent 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.
HAvoid continuously high levels of humidity (e.g. through
frequent drying of laundry).
HNever close existing ventilation openings.
Sources of combustion and ventilation air contaminants
Areas likely to contain contaminants:
HNew building construction
HSwimming pools
HRemodelling areas, hobby rooms
HGarages with workshops
HFurniture refinishing areas
HDry cleaning/laundry areas and establishments
HAuto body shops
HRefrigeration repair shops
HMetal fabrication plants
HPlastic manufacturing plants
HPhoto processing plants
HBeauty salons
Products containing contaminants:
HChlorine-type bleaches, detergents and cleaning
solvents found in household laundry rooms
HPaint and varnish removers
HHydrochloric acid, muriatic acid
HChlorine-based swimming pool chemicals
HSpray cans containing chlorofluorocarbons
HChlorinated waxes and cleaners
HCements and glues
HRefrigerant leaks
HCalcium chloride used for thawing
HSodium chloride used for water softening salt
HPermanent wave solutions
HAdhesives used to fasten building products and other
similar items
HAntistatic fabric softeners used in clothes dryers
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.
IMPORTANT
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.
Installation area conditions
WARNING
Incorrect ambient conditions can lead to damage to the
heating system and put safe operation at risk.

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Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
Set-up
Before Set-up
Note: The Vitodens 222-F, B2TB boiler has passed the
zero inches vent clearance to combustibles testing
requirements dictated by the boiler Harmonized
Standard ANSI Z21.13. CSA 4.9 (latest edition) and
therefore is listed for zero clearance to combustibles
when vented with a single-wall UL/ULC certified
special venting system. The zero inches vent
clearance to combustibles for the Vitodens boiler
supercedes the clearance to combustibles listing
that appears on the special venting system label.
The back or side clearance shall be increased if
piping installation is required.
Before placing boiler in its installation location, ensure all
necessary accessories are installed.
Minimum Clearances
CAUTION
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.
Recommended minimum service clearances
For typical Vitodens installations, Viessmann recommends
installing the boiler with the service clearances shown in
the illustration on the left.
Note: The 12 in. (305 mm) side clearance specified is
only recommended to be able to view the boiler
certified rating plate, decal and also accommodate
the PRV installation kit.
The 2 in. (50 mm) clearance shown is to connect the
discharge pipe on either the left or right side of the boiler
for the pressure relief valve or the DHW tank temperature
and pressure valve.
This reduced clearance is also used in Vitodens multiple
boiler installation system as described in
the multiple boiler installation instructions.
The Vitodens 222-F, B2TB boilers are approved for
closet and alcove installation with the clearances to
combustibles listed.
See the Vitodens 222-F B2TB Venting
System Installation Instructions for details.
Boiler model B2TB 19, 68 35, 125
Top 0 0
Sides (left and right) 0 0
Vent pipe 0 0
Front (alcove or closet) 0 0
Rear 0 0
Floor combustible combustible
Minimum clearances to combustibles

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5461 889 - 16
Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
Legend
A Heating supply NPT ¾ in.
B DHW NPT ¾ in.
C Pressure relief valve discharge pipe NPT ¾ in.
D DCW NPT ¾ in.
E Heating return NPT ¾ in.
F Temperature and pressure relief valve discharge
pipe NPT ¾ in.
Connections
Boiler water connection and piping
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.
Note: See installation fitting sets on page 58.
Boiler Connections
Min. 6”
(Min. 152 mm)
Min. 6”
(Min. 152 mm)

5461 889 - 16
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Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
Connections (continued)
Boiler Connections
Note: The dimensional drawing shows example fittings for upward connection and connection to the left/right.
Order the connection sets separately as accessories. For the dimensions of the individual connection sets,
see the design information.
Model B2TB 19, 35, 68, 125 Model B2TB 19, 35, 68, 125
a *1in. (mm) 46.1 (1172) k *1in. (mm) 65.6 (1665)
b *1in. (mm) 48.3 (1227) l *1in. (mm) 68.0 (1726)
c *1in. (mm) 28 (710) approx. m in. (mm) 16.1 (410)
d *1in. (mm) 52.6 (1337) n in. (mm) 8.8 (224)
f *1in. (mm) 57.0 (1447) o in. (mm) 15.3 (389)
g in. (mm) 2.0 (50) p in. (mm) 14.2 (361)
h *1
in. (mm) 59.1 (1502) q in. (mm) 12.6 (320)
i *1in. (mm) 64.2 (1630) r in. (mm) 13.0 (330)
j *1in. (mm) 65.6 (1666) s in. (mm) 8.7 (220)
Note: All height dimensions of the boiler have a tolerance of +.6 in. (+15 mm) due to the factory installed adjustable feet
*1 Add 1fin. (40 mm) when using the optional accessory seismic bracket kit.
Note: All height dimensions of the boiler have a tolerance of +.5 in. (+13 mm) due to the seismic bracket adjustable feet.
*1
Legend
ACondensate Drain (side)

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5461 889 - 16
Vitodens 222-F, B2TB 19, 35, 68, 125 Installation Boiler Connections
Connections (continued)
Boiler venting
The Vitodens 222-F B2TB boiler comes with a pre-installed
vent pipe adaptor C.
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).
Proper piping practice
Support piping by proper suspension method. Piping
must not rest on or be supported by boiler. Use moderate
amount of dope.
Use an approved pipe sealant or teflon tape when
connecting the following installation fittings.
Connecting power
The Vitodens 222-F boiler has a external accessories
connection box installed, which requires a 120VAC
power supply from a wall receptacle. Refer to the wiring
diagram (see page 41).
WARNING
Remove outer gasket from vent pipe adaptor
C
C if single
wall (boiler room air dependant) venting system is used.
2 imperfect threads
Leave 2 threads bare
CAUTION
Under certain climatic conditions some building materials
may be affected by flue products expelled in close
proximity to unprotected surfaces. Sealing or shielding of
the exposed surfaces with a corrosion resistant material
(e.g. aluminum sheeting) may be required to prevent
staining or deterioration. The protective material should
be attached and sealed (if necessary) to the building
before attaching the vent termination. It is strongly
recommended to install the vent termination on the
leeward side of the building.
Connecting heating system
Flush heating system thoroughly prior to connecting boiler
Refer to the Vitodens Venting System
Installation Instructions
Legend
ACombustion air
BFlue gas exhaust
When utilizing the combustion air inlet seal Afor Vitodens
222 B2TB boilers, remove the inlet seal A, tear out center
section and install the remaining rubber seal back into the air
inlet opening.

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14
Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
Connections (continued)
Boiler Connections
Legend
AGas connection 7¾ in. (NPT)
B Accessible manual gas shutoff valve
C Ground joint union
DDrip leg
Gas connection and piping
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.
CAUTION
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.
IMPORTANT
Design piping layout in such a way that piping does not
interfere with serviceable components.
IMPORTANT
Max. gas supply pressure: 14 “w.c.
WARNING
The gas supply piping must be leak tested before placing
the boiler in operation.
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 (choose one of three locations).
3. Perform gas piping pressure test as described in the
following subsection.
4. Identify shutoff valves as such with a tab and
familiarize operator / ultimate owner of boiler with
these valves.
IMPORTANT
The Vitodens 222-F B2TB has a factory pre-installed
flexible gas line for left, right or vertical installation.
See Vitodens 222-F B2TB Service Instructions
for applicable system coding information.
Manual gas shutoff
Closed
Open
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.

15
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Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
Connections (continued)
Boiler Connections
Gas piping pressure test
When performing the gas piping pressure test, ensure the
following requirements are met.
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.
IMPORTANT
½ psig = 14 “w.c.
WARNING
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.
Flue gas connection
Connect the balanced flue.
See Venting Installation Instructions.

5461 889 - 16
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Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
Removing the front panels
1. Remove the front upper panel.
2. Tilt the lower front panel.
3. Remove the retaining screw and set aside.
4. Lift up and out to remove the lower front panel.
5. Loosen the screws at the bottom of the boiler as
shown (do not remove completely).
6. Move the boiler to the location where it is to be
installed.
7. Using the adjustable legs level the unit.
CAUTION
The boiler must be level both vertically and horizontally
to ensure proper draining of the condensate.
Connections (continued)
Boiler Connections

17
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Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
Connections (continued)
Boiler Connections
Accessing the control unit connections
1. Remove both screws from the external accessory
connection box front plate and set aside.
2. Remove both retaining screws as shown and set
aside.
3. Pull the external accessory connection box forward.
4. Swing the external accessory connection box down.

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18
Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
5. Tilt the bottom of the external accessory connection
box cover forward.
6. Pull the cover up to clear the locating pins and out
to remove, then set aside.
7. Slide both sides of the programming unit cover closed.
8. Release the hinged hooks located on both sides of
the control console.
9. To open hinged cover, lift cover and then fold down
the control console.
Connections (continued)
Boiler Connections

19
5461 889 - 16
Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
10. Release locking tabs as shown.
11. Remove cover.
CAUTION
When running and securing connecting cables on site,
ensure that the maximum permissible temperatures of
the cables are not exceeded.
Electronic modules can be damaged by
electrostatic discharges. Before commencing
work, touch grounded objects (such as heating
or water pipes) to discharge static loads.
12. Route all connecting cables to the appropriate areas
and secure the cables to the control base using
existing strain reliefs as shown.
Connections (continued)
Boiler Connections

5461 889 - 16
20
Vitodens 222-F, B2TB 19, 35, 68, 125 Installation
Connections (continued)
Boiler Connections
External accessory connection box
Note: See wiring diagram on page 41 for connection
to the control base.
0-10V INPUT
ACCESSORIES
(ie VITOTROL
REMOTE OR
MIXING VALVE)
PUMP
120/1/60 (12 Amps -
full load amperage)
POWER SUPPLY WITH
DISCONNECT AND
PROTECTION
IMPORTANT
Electrical installations must comply with the latest edition of:
In the U.S.A., the National Electrical Code (NEC),
ANSI/NFPA 70 and any other state, local codes and/or
regulations.
In Canada, the Canadian Electrical Code (CEC),
CSA C22.1 Part 1 and any other province, territory,
local codes and/or regulations.