Viessmann B1KA Quick guide

Installation and Service
Instructions
VITODENS

100-W
5784 568 - 13 01/2019
for use by heating contractor
Vitodens 100-W B1HA/B1KA
Models 26 to 125
Wall-Mounted, gas-fired condensing boilers
On demand domestic hot water with Combi boiler
Read and save these instructions
for future reference.
IMPORTANT
Please file in Service Binder
Heating input: 21 to 125 MBH
6.2 to 36.6 kW
H

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5784 568 - 13
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Safety, Installation and Warranty Requirements
Safety
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
manufacturer’s maintenance schedule of the boiler.
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 Safety 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 “Combustion Air Supply”.
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 instructions supplied with
burner.
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
“Combustion Air Supply”.
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.

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5784 568 - 13
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service Table of Contents
Safety, Installation and Warranty Requirements..............2
Important Regulatory and Installation Requirements ....... 5
About these Installation Instructions .............................7
Applicability..............................................................8
Product Information....................................................8
Mechanical Room ......................................................9
Minimum Clearances.................................................10
Boiler Dimensions.....................................................11
Boiler Mounting........................................................13
Boiler Connections ...................................................17
Vent connections ..................................................17
Proper piping practice ............................................18
Gas connection and piping......................................18
Gas piping pressure test........................................... 19
Heating water connections .....................................20
Condensate connection..........................................21
Fill siphon with water ............................................21
Safety Connections ..................................................22
Installing safety devices on the boiler.......................22
Low water cut-off .................................................22
Hot water temperature and system pressure.............23
Installation Examples ................................................24
General ................................................................24
Clearances ...........................................................24
Heating circuit pumps ............................................24
Waterside flow .....................................................25
Built-in pump ........................................................26
B1HA with one heating circuit ...................................27
B1HA with one heating circuit, DHW tank and LLH ......28
B1HA with one heating circuit and DHW tank..............29
B1KA with one heating circuit....................................30
B1KA with one heating circuit and LLH .......................31
B1KA with one heating circuit without LLH .................32
Boiler in heating/cooling application .........................33
Boiler with low water cut-off (remote mounted,
field supplied) .......................................................34
Venting...................................................................34
Neutralization Unit....................................................35
Accessing Electrical Connections................................36
Accessing Electrical Connections................................36
Removing the front cover ..................................... 36
Rotating the control unit and opening the
power/pump module............................................ 36
Power supply 120VAC, 60 Hz, 1PH ........................37
Location of terminal block and temperature sensor..
connections..........................................................37
Connecting Viessmann DHW tank temperature
sensor on B1HA only .............................................38
Connecting a field supplied tank temperature controller
on B1HA only (e.g. Honeywell Aquastat or others) ....39
Room thermostat ..................................................40
Connecting the outdoor temperature sensor..............41
Connecting an OpenTherm (OT) device ....................41
Closing the control unit .........................................42
Reinstalling the front panel .....................................42
Safety
General Information
Dimensions
Connections
Control Connections
Page

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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Table of Contents
Necessary Tools ......................................................43
Testing/analysis equipment.....................................43
Overview of Controls and Indicators ...........................43
Control and display elements ................................ 43
Check Power Supply Connection................................43
Setup Menu Overview ..............................................44
Filling and Bleeding the Heating System .....................44
Select Appropriate Gas Type .....................................46
Converting Gas Type ...............................................46
Measure Static Pressure and Running Pressure.............46
Checking the CO2Content/Relay Tests .......................48
High Altitude Setting ................................................49
Setting Required Heating Input...................................49
Configuring DHW Tank Sensor Input..........................50
Setting the Unit of Measurement (temperature unit)......50
Setting the DHW Comfort Function ..........................50
Clock Natural Gas Meter ...........................................51
Check all Primary and Secondary Circuit Connections
for Leaks.................................................................51
Perform Combustion Analysis ....................................51
Check Venting System for Leaks................................52
Removing the front Panel ..........................................52
Removing the Burner ................................................53
Reinstall the Burner Assembly....................................53
Check Burner Gasket and Cylinder Assembly for Damage .53
Check and Adjust Ignition and Ionization Electrodes......54
Check Condensate Drain and Clean Siphon..................54
Check Neutralization Unit ..........................................55
Clean Combustion Chamber/Heat Exchanger Surfaces...55
Check Diaphragm Expansion Tank and System Pressure .56
Check Function of Safety Valves................................56
Check Gas Pipes and Fittings for Leaks .........................56
Install Burner ...........................................................57
Reinstall Front Panel .................................................57
Troubleshooting Steps .............................................58
Changing Room Temperature .................................. 58
Diagnosis ........................................................... 59
Boiler Connection .................................................... 62
Electrical Connections to the Terminal Strip for Accessories.69
Technical Data.........................................................70
Burner Program Sequence of Operation .......................74
B1HA 26, 35, 94, 125 Wiring Diagram .......................76
B1KA 35, 125 Wiring Diagram...................................77
Parts List................................................................78
Installation Fittings ...................................................89
Maintenance Record .................................................90
Lighting and Operating Instructions.............................91
Start-up, Inspection and Maintenance
Troubleshooting
Additional Information
Page

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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service Safety
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 (latest edition), where required by the authority
having jurisdiction.
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.
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 100/200 boilers are equipped with flow switches that when activated disable or 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 method #1:
Close the boiler valve and jump the flow switch.
Run the boiler at high fire and it will shut down by the coding card (in WB2B models, set coding address 06 to
max.) but should continue to stack the boiler temp 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 method #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 temp should continue to stack 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 method #3:
Remove one of the wires connected to limit switch, this will produce a fault in the boilers control that requires
manual reset.

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5784 568 - 13
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Safety
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.

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5784 568 - 13
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service Safety/ General Information
Important Regulatory and Installation Requirements (continued)
Working on the equipment
The installation, adjustment, service, and maintenance of
this boiler must be performed 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.
Technical literature
Literature for the Vitodens boiler:
- Technical Data Manual
- Installation and Service Instructions
- Operating Instructions and User's Information Manual
- Vitodens Venting System Installation Instructions
- Quick Start Guide
- Instructions of other products utilized and installed
- Installation codes mentioned
in this manual and as locally applicable
The completeness and functionality of field supplied
electrical controls and components must be verified
by the heating contractor. This includes low water
cutoffs, 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.
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 death, serious injury
or substantial product/property damage.
CAUTION
Indicates an imminently hazardous situation which,
if not avoided, may result in minor injury or product/
property damage.

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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Applicability
The boiler serial number must be provided when ordering
replacement parts. Both the 16-digit serial number bar
code label and the 12-digit ASME serial number correlate
to each other. Providing either serial number is sufficient.
Model No. Serial No.
B1HA 26, 94 7560853
B1HA 35, 125 7560854
B1KA 35, 125 7560855
Product Information
The Vitodens 100-W B1HA is available as a gas condensing
boiler for the connection of one DHW tank or as a gas
condensing combi boiler B1KA with an integral plate heat
exchanger for DHW heating. For the connection of
heating circuits and the DHW tank or the DCW/DHW piping
for the B1KA, see installation examples starting on page 24.
In the factory set condition, the Vitodens 100-W is set
up for operation with constant boiler water temperature.
By connecting an outdoor temperature sensor (included
with installation accessories), the boiler can be operated in
weather-compensated mode.
The following are integrated: closed loop hydraulic system
with 2 connections for heating system supply and return,
and 2 connections for DHW tank heating (B1HA) or on
demand DHW heating (B1KA).
IMPORTANT
General Information
These boilers are only intended for installation in close
loop heating systems. The following components are
integrated into the boiler:
Circulation pump
3-way diverter valve
Pressure relief valve
Diaphragm expansion vessel (B1KA only)
Plate heat exchanger for DHW heating (B1KA only)
ASME stamp 12-digit
serial number location
(metallic plate riveted on
the heat exchanger)
Stainless steel Inox-Radial
heat exchanger
Serial No. location (16-digit
bar code white label located
inside the boiler compartment
and underneath the boiler)

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5784 568 - 13
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service General Information
Mechanical Room
During the early stages of new home design, we
recommend that proper consideration be given to
constructing a separate mechanical room dedicated to
gas- or oil-fired equipment including domestic hot water
storage tanks.
The boiler must be located in a heated indoor space,
near a floor drain, and as close as possible to the wall.
Whenever possible, install boiler near an outside wall so
that it is easy to duct the venting system to the boiler.
Locate boiler on walls capable of supporting the weight
of the boiler filled with water (see section entitled
“Technical Data" on page 71 for information required for
total boiler weight calculation). Ensure that boiler location
does not interfere with proper circulation of combustion
and ventilation air of other fuel burning equipment (if
applicable) within the mechanical room.
The maximum room temperature of the mechanical room
where the boiler is located must not exceed 104°F (40°C).
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.
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
below indicates the main, currently known sources.
Avoid continuously high levels of humidity
(e.g. through frequent drying of laundry).
Never close existing ventilation openings.
IMPORTANT
WARNING
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!

Shut down the boiler

Close fuel shut-off valves

Use a tested fire extinguisher, class ABC.
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
Before set-up
Before placing boiler in its installation location, ensure all
necessary accessories are installed.
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.
h

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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Minimum Clearances
Note:The Vitodens 100-W 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
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 100-W boiler supercedes the clearance
to combustibles listing that appears on the special
venting system label.
Top clearance - 12 in. (30 cm).
See the Vitodens Venting System
Installation Instructions.
Clearance to combustibles
AL = Alcove
CL = Closet
Top Front Rear Left Right Vent
pipe*1
0 0 AL,
CL
00 0 0
Front
Side
Side
Back
Top
*1 Refer to the Installation Instructions of the Vitodens
Venting System for details.
Dimensions
Recommended minimum boiler clearances to combustibles
Recommended minimum boiler service clearances

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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Boiler Dimensions
Dimensions overview without bottom piping connections
The maximum ambient temperature must not exceed
104º F (40º C).
Heating water connections, DHW tank connections B
and D, DCW G / DHW H (where applicable) and
gas connection to be made in the field.
See connection-specific section for details.
See subsection entitled “Power supply connection"
for details regarding power supply to the Vitodens
100-W boiler.
IMPORTANT
When preparing gas, water and electrical
connections in the field, see section entitled
“Boiler Mounting” on page 13 of this manual for
information regarding the installation of the wall
mounting bracket.
Dimensions
Vitodens 100-W, B1HA series and B1KA combi
Legend
ACondensate drain, plastic hose Ø 1 in. (Ø 22 mm)
BBoiler water supply, NPT ¾ in. (male thread)
CGas connection, NPT ¾ in. (male thread)
DBoiler water return, NPT ¾ in. (male thread)
ECombustion air opening for double pipe system
FCombustion air opening for coaxial system/gas vent
adaptor
G- For B1HA series, DHW tank heating supply
NPT ¾ in. (male thread)
- For B1KA combi, DHW, NPT ½ in. (male thread)
H- For B1HA series, DHW tank heating return
NPT ¾ in. (male thread)
- For B1KA combi, DCW, NPT ½ in. (male thread)
IOpening for pressure relief valve
Dimensions
a ain. (5 mm) - both sides of the boiler
b 15¾ in. (400 mm)
c 2fin. (68 mm)
d 27½ in. (700 mm)
e 47/8in. (123 mm)
f 6 in. (150 mm)
g 15¾ in. (400 mm)
h 5 in. (125 mm)
i 9ein. (250 mm)
j 1din. (34 mm)
k 77/8in. (200 mm)
l 3din. (80 mm)
m 2ain. (58 mm)
Front view Side view Top view
Note: The B1HA DHW supply and return connections are
supplied capped. For installations that require DHW
tank connections remove caps. For installations that
do not require DHW tank connections leave caps
installed.

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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Boiler Dimensions (continued)
Piping connections for Vitodens 100-W,
B1HA series and B1KA
Dimensions
Note: The B1HA DHW supply and return connections are
supplied capped. For installations that require DHW
tank connections remove caps. For installations that
do not require DHW tank connections leave caps
installed.
Legend
A- DHW tank heating supply for B1HA boilers
B- DHW tank heating return for B1HA boilers
C- DHW for B1KA boiler
D- DCW for B1KA boiler
BWR Boiler water return
BWS Boiler water supply
BD Boiler drain
BF Boiler fill
GC Gas connection
PRV Pressure relief valve
PG Pressure gauge
VC Venting connection
TG Temperature gauge
DHW PRV Domestic hot water pressure relief valve (150 psi)
*Field supplied
*Field supplied

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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service Dimensions
Boiler Mounting
Boiler installation
The Vitodens 100-W boiler can be wall-mounted on:
- a brick/concrete wall
- wood studs
- metal studs
- boiler stand
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 ein. (10 mm)].
2. Align wall mounting boiler bracket and attach to wall
with the screws and plastic anchors supplied.
CAUTION
Whichever mounting method is used, ensure that
the boiler bracket is tightly and securely fastened to
wall. Failure to secure the boiler properly could cause
loosening, posing a severe safety hazard.
Legend
ABoiler mounting
Mounting Vitodens 100-W boiler

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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Installation
Boiler Mounting (continued)
Install mounting bracket on wood studs as per illustration.
Drill 3/16 in. pilot holes to insert mounting bolts. Ensure
that holes are located in the center of each wood stud.
Secure with bolts to wooden studs as shown.
Install mounting bracket on metal studs as per illustration.
Drill fin. pilot holes to insert anchors. Ensure that
holes are located in the center of each metal stud. Use
appropriate fasteners to mount boiler mounting bracket
to metal studs (not supplied). Secure with bolts to metal
studs as shown.
Boiler mounting bracket installation on wood studs
Boiler bracket
Boiler bracket
Boiler mounting bracket installation on metal studs

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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Boiler Mounting (continued)
Installation
Mounting the boiler to the wall
Note: Prior to installing the boiler verify that the minimum
mounting clearances are met.
1. Mount boiler onto the mounting bracket, ensure the
boiler is level.

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Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Boiler mounting frame dimensions
The boiler stand is used for free-standing installation of
a single boiler within the mechanical room.
When using the boiler stand, ensure that the stand is
securely fastened to the floor (recommended concrete
expansion anchors are Hilti model KB-TZ ex 4 or
equivalent.
The Vitodens 100-W, does not come with a mounting
template. The wall location for the frame, mounting
bracket and all vents must be field calculated.
Boiler mounting bracket and frame
1. Attach the wall mounting bracket (supplied with the
boiler) to the boiler mounting frame using the supplied
hardware. Ensure that the wall mounting bracket is
level.
2. Move the rack into position and secure to the floor
(and to the wall if needed).
Boiler Mounting (continued)
CAUTION
The boiler must be level both vertically and horizontally
to ensure proper draining of the condensate.
Installation
Refer to the single boiler rack Installation
Instructions for more details.
Vitodens 100-W, B1HA 26, 35, 94, 125 B1KA 35, 125
a *1in. (mm) 45f(1160)
b *1in. (mm) 77c(1975)
c in. (mm) 17c(450)
d in. (mm) 1a(33)
e in. (mm) 79 (2007)
*1 K bin. (12.7 mm) for adjustment of the levelling feet.

17
5784 568 - 13
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service Connections
Boiler Connections
Vent connections
The Vitodens 100-W boiler comes with a preinstalled vent
pipe adaptor (as shown).
Run venting system, single-pipe, two-pipe or coaxial,
through the side wall, roof or chimney, taking the shortest
possible route and at a rising angle (min. 3º).
Coaxial combustion air inlet cover shown installed.
For coaxial venting system, remove the cover from the
flue gas vent adaptor.
Refer to the Vitodens Venting System Installation
Instructions.
When utilizing the combustion air inlet cover Afor
Vitodens 100-W series boilers, remove the center section
and leave the rubber seal in place.
Legend
ACombustion air inlet cover
BFlue gas vent adaptor

18
5784 568 - 13
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Connections
Boiler Connections (continued)
Proper piping practice
Gas connection and piping
Support piping by proper suspension method.
Piping must not rest on or be supported by boiler.
Legend
ABoiler water supply connection NPT ¾ in. (male thread)
BDHW tank heating supply NPT ¾ in. (male thread)
(for B1HA) or DHW connection NPT ½ in. (male thread)
(for B1KA)
CGas connection NPT ¾ in. (male thread)
DDHW tank heating return NPT ¾ in. (male thread)
(for B1HA) or DCW connection NPT ½ in. (male thread)
(for B1KA)
EBoiler water return connection NPT ¾ in. (male thread)
1. Make gas connection in accordance with codes
CAN/CSA B149.1 or 2 in Canada. In the United
States, use the National Fuel Gas Code ANSI Z223.1/
NFPA 54, as well as local codes where applicable.
2. Close gas shutoff valve on boiler.
3. Perform leak test.
4. Bleed air from gas supply pipe.
See following page for details on gas connection and piping.
2 imperfect threads Use moderate amount of dope
Leave 2 threads bare
Note: The B1HA DHW supply and return connections are
supplied capped. For installations that require DHW
tank connections remove caps. For installations that
do not require DHW tank connections leave caps
installed.

19
5784 568 - 13
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service Connections
Boiler Connections (continued)
Gas connection and piping (continued)
Max. gas supply pressure: 14 “w.c.
1. Refer to current CAN/CSA B149.1 or 2 in Canada.
In the United States, use the 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
- 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. Valves must be listed by a nationally
recognized testing agency. Make boiler gas
connection as shown on the left.
Gas connection (NPT)..................................¾ in.
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.
WARNING
The gas supply piping must be leak tested before
placing the boiler in operation.
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
IMPORTANT
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.
Gas piping pressure test
When performing the gas piping pressure test, ensure the
following requirements are met.
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.
Legend
AGas connection
BAccessible manual gas
shutoff (factory supplied)
CDrip leg

20
5784 568 - 13
Vitodens 100-W, B1HA/B1KA 26 to 125 Combi Installation/Service
Boiler Connections (continued)
Connections
Heating water connections
1. Thoroughly flush heating system (particularly before
connecting the boiler to an existing system).
2. Connect boiler to the heating system.
Note: Use an approved pipe sealant or teflon tape
when connecting the installation fittings.
Use a two-hand wrench method when tightening
fittings or piping onto the boiler connectors. Use
one wrench to prevent the boiler pipes from twisting
and the second wrench to tighten the fitting or
piping. Failure to support the boiler connection could
damage the boiler and its internal piping.
SUPPORT ALL PIPING USING HANGERS. DO NOT support
piping by the boiler or its components.
Use isolation valves to isolate system components.
The B1HA DHW tank heating supply and return ports
must remain capped if the DHW tank is not used.
All plumbing must meet or exceed all local state and
national plumbing codes.
WARNING
The pressure gauge is a sensitive component and may
be damaged if the boiler connections are not supported
by using a second wrench when tightening fittings
and/or piping.
IMPORTANT
Legend
A- DHW tank heating supply for B1HA boilers
B- DHW tank heating return for B1HA boilers
C- DHW for B1KA boiler
D- DCW for B1KA boiler
BWR Boiler water return
BWS Boiler water supply
BD Boiler drain
BF Boiler fill
GC Gas connection
PRV Pressure relief valve
PG Pressure gauge
VC Venting connection
TG Temperature gauge
DHW PRV Domestic hot water pressure relief valve (150 psi)
*Field supplied
*Field supplied
Note: The B1HA DHW supply and return connections are
supplied capped. For installations that require DHW
tank connections remove caps. For installations that
do not require DHW tank connections leave caps
installed.
Max. allowable working pressure (MAWP)..3 bar (45 psig)
WARNING
Exposing the boiler to pressures and temperatures in
excess of those listed will result in damages, and will
render warranty null and void.