Viessmann Vitodens 100-W WB1B Series Quick guide

Installation and Service
Instructions
VITODENS 100-W
d
5368 828 v1.6 11/2010
for use by heating contractor
Vitodens 100-W
WB1B Series
Wall-Mounted, gas-fired condensing boiler
®This trademark is registered with the U.S. Patent and Trademark Office
Vitodens 100-W, WB1B
(with preinstalled coaxial vent pipe adaptor)
Read and save these instructions
for future reference.
IMPORTANT
Please file in Service Binder
Heating input 37 to 118 MBH
10.8 to 34.5 kW

2
5368 828 v1.6
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).
Safety
The installation, service, and
maintenance of this equipment
must be performed by a licensed
professional heating contractor.
u Please see section
entitled “Important
Regulatory and
Installation
Requirements" in the
Installation Instructions.
Read all applicable documentation
before commencing installation.
Store documentation near boiler
in a readily accessible location for
reference in the future by service
personnel.
u For a listing of
applicable literature,
please see section
entitled”Important
Regulatory and
Installation Requirements"
in the Installation Instructions.
Improper installation, service and/
or maintenance can cause flue
products to flow into living space.
Flue products contain poisonous
carbon monoxide gas.
u 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
Venting System.
Never operate boiler without
an installed venting system. An
improper venting system can cause
carbon monoxide poisoning.
Information contained in
this and related product
documentation must be
read and followed.
Failure to do so may
render the warranty
null and void.
gWarranty
gEquipment ventinggCarbon monoxide
gProduct documentation
gLicensed professional heating
contractor
WARNING
Installers must follow local
regulations with respect to
installation of carbon monoxide
detectors. Follow manufacturer’s
maintenance schedule of boiler.
gAdvice 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.

5368 828 v1.6
3
Table of Contents
Safety, Installation and Warranty Requirements.............................................4
About these Installation Instructions............................................................8
Applicability.............................................................................................9
Product Information...................................................................................9
Mechanical Room. ..................................................................................10
Before Set-up.........................................................................................12
Minimum Clearances. ..............................................................................12
Preparing the Connections........................................................................13
Connections overview..............................................................................13
Dimensions overview without bottom piping connections.............................14
Dimensions overview with connections......................................................15
Dimensions overview with connections and alternative drain
connection.............................................................................................15
Wall Mounting........................................................................................16
Wall mounting bracket installation.............................................................16
Mounting Vitodens 100-W boiler...............................................................18
Connections...........................................................................................18
Flue gas connection.................................................................................18
Proper piping practice..............................................................................19
Gas connection and piping........................................................................19
Gas piping pressure test............................................................................21
Heating water connections.......................................................................22
Condensate connection............................................................................23
Fill siphon with water..............................................................................23
Safety Connections and Pressure Testing...................................................24
Installing safety devices on the boiler.........................................................24
Performing pressure test on the boiler........................................................25
Hot water temperature and system pressure...............................................25
Installation Examples...............................................................................26
Boiler in heating/cooling application...........................................................34
Boiler with low water cut-off (remote mounted, field supplied)......................35
Low-loss header......................................................................................36
Venting Connection.................................................................................37
Safety
General Information
Set-up
Boiler Connections
Page

5368 828 v1.6
4
Table of Contents
Electrical Connections..............................................................................37
Rotating the control unit and opening
the power / pump module.........................................................................37
Electrical connections to the power / pump module.....................................38
Optional operating control - Open Therm....................................................38
Closing the power / pump module and reinstalling the control unit................39
Reinstalling the front panel.......................................................................39
Necessary Tools......................................................................................40
Overview of Controls and Indicators..........................................................41
Overview of Components.........................................................................43
Procedure(Overview)...............................................................................44
Steps.....................................................................................................45
TroubleshootingSteps..............................................................................62
Overview of Controls and Indicators..........................................................62
Changing Room Temperature....................................................................63
Diagnosis...............................................................................................64
Sequence of operation and potential faults during each start-up cycle............64
Diagnostics table: Faults with fault display on control unit.............................65
How to reset faults..................................................................................66
Correction .............................................................................................67
Remove front panel.................................................................................67
Check boiler temperature sensor................................................................67
Check outdoor temperature sensor............................................................68
Determining the boiler set-point.................................................................69
Check fixed high limit...............................................................................70
Check flue gas temperature sensor............................................................70
Checkfuses............................................................................................71
Electrical connections to the power / pump module
(room thermostat and DHW)....................................................................72
Input module description OT (Open Therm)
& 0-10V reset modules............................................................................73
Technical Data.......................................................................................74
Burner Program Sequence of Operation......................................................77
Wiring Diagram - natural gas / propane.......................................................79
Parts List...............................................................................................80
Maintenance Record................................................................................83
Lighting and Operating Instructions............................................................84
Control Connections
Initial Start-up,
Inspection and
Maintenance
Troubleshooting
Additional Information
Page

5368 828 v1.6
5
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 B214-01, where required by the
authority having jurisdiction.
u 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.
u This product comes with several
safety instruction labels attached.
Do not remove!
Contact Viessmann immediately if
replacement labels are required.

5368 828 v1.6
6
Safety
Important Regulatory and Installation Requirements
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 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.

5368 828 v1.6
7
Safety
Important Regulatory and Installation Requirements
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
- Instructions of other products utilized
and installed
- Installation codes mentioned
in this manual and as locally
applicable
u The completeness and
functionality of field supplied
electrical controls and
components must be verified
by the heating contractor. This
includes low water cut-offs, flow
switches (if used), staging
controls, pumps, motorized
valves, air vents, thermostats,
etc.
u 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.
u This product comes with several
safety instruction labels attached.
Do not remove!
Contact Viessmann immediately if
replacement labels are required.

8
5368 828 v1.6
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.
u
IMPORTANT
CAUTION
Indicates an imminently hazardous
situation which, if not avoided, may
result in minor injury or product/
property damage.
uWarnings draw your attention to
the presence of potential hazards or
important product information.
uCautions draw your attention to
the presence of potential hazards or
important product information.
uHelpful hints for installation,
operation or maintenance which
pertain to the product.
uThis symbol indicates that
additional, pertinent information is
to be found.
uThis 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.
General Information

5368 828 v1.6
9
General Information
Applicability
IMPORTANT
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/
NB serial number correlate to each
other. Providing either serial number
is sufficient.
Model No. Serial No.
WB1B 26
7374861£££££££££
and
WB1B 35
7374862£££££££££
Product Information
Natural / propane gas-fired wall-mounted hot water heating boiler for space
heating.
For operation with constant (set-point) and outdoor temperature responsive
control in closed loop, forced circulation hot water heating circuits. An external
controller is required for DHW production.
The Vitodens 100-W comes factory set for operation with natural gas. Propane
conversion kit is included with each boiler.
Boiler model must be selected based on an accurate heat loss calculation of the
building. Ensure boiler model is compatible with connected radiation.
Vitodens 100 boilers are factory tested and calibrated. Further gas valve
adjustments are typically not required during field start-up.
Follow the Vitodens Venting System Installation Instructions to vent this boiler.
ASME/NB stamp 12-digit
serial number location
(metallic plate riveted on the heat
exchanger) H
Stainless steel Inox-Radial
heat exchanger
Serial No. location
(16-digit bar code white label
located on the boiler as shown
in this drawing)
digi
t
on the heat
adia
l
te label
as shown
Fig. 1

10
5368 828 v1.6
Mechanical Room
General Information
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 75 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.
IMPORTANT
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.

5368 828 v1.6
11
Mechanical Room (continued)
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!
nShut down the boiler
nClose fuel shut-off valves
nUse a tested fire extinguisher,
class ABC.
WARNING
Incorrect ambient conditions can
lead to damage to the heating
system and put safe operation at risk.
Installation area conditions
gEnsure ambient temperatures are
higher than 32° F / 0° C and
lower than 104° F / 40° C.
gPrevent 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.
gAvoid continuously high levels of
humidity (e.g. through frequent
drying of laundry).
gNever close existing ventilation
openings.
Sources of combustion and ventilation
air contaminants.
Areas likely to contain contaminants:
gNew building construction
gSwimming pools
gRemodelling areas, hobby rooms
gGarages with workshops
gFurniture refinishing areas
gDry cleaning/laundry areas and
establishments
gAuto body shops
gRefrigeration repair shops
gMetal fabrication plants
gPlastic manufacturing plants
gPhoto processing plants
gBeauty salons
Products containing contaminants:
gChlorine-type bleaches, detergents
and cleaning solvents found in
household laundry rooms
gPaint and varnish removers
gHydrochloric acid, muriatic acid
gChlorine-based swimming pool
chemicals
gSpray cans containing
chlorofluorocarbons
gChlorinated waxes and cleaners
gCements and glues
gRefrigerant leaks
gCalcium chloride used for thawing
gSodium chloride used for water
softening salt
gPermanent wave solutions
gAdhesives used to fasten building
products and other similar items
gAntistatic fabric softeners used in
clothes dryers
General Information

12
5368 828 v1.6
Before Set-up
General Information/Set-up
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.
Before placing boiler in its installation
location, ensure all necessary
accessories are installed.
Recommended minimum service
clearances
Refer to Fig. 2 and 3.
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 4.9.2007 and therefore is listed
for zero clearance to combustibles
when vented with a single-wall
special venting system (AL-29-4C
material) or UL/ULC-listed CPVC gas
vent material. The zero inches vent
clearance to combustibles for the
Vitodens 100-W boiler supercedes the
clearance to combustibles listing that
appears on the special venting system
label.
Top clearance - 12” / 30 cm.
See the Vitodens Venting
System Installation
Instructions.
Clearance to combustibles
AL = Alcove
CL = Closet
*1Refer to the Installation Instructions
of the Vitodens Venting System
for details.
Fig. 2
Fig. 3
Top Front Rear Left Right Vent
pipe*1
0 0 AL,
CL
0 0 0 0
Front
Side
Side
Back
Top*

5368 828 v1.6
13
Boiler Connections
Preparing the Connections
Connections overview
Use an approved pipe sealant or teflon tape when connecting the following
installation fittings.
This section is an overview only!
Refer to subsequent sections for
detailed information on individual
piping connections.
Piping connections for Vitodens
100-W, WB1B 26 and 35
(factory supplied)
Legend
BWR Boiler water return, ¾”
BWS Boiler water supply, ¾”
BD Boiler drain
BF Boiler fill
GC Gas connection, ¾” NPTM
(male thread)
PRV Pressure relief valve
NPT National Pipe Thread
VC Vent connection
CAI Combustion air inlet
connection (optional)
Fig. 4
VC
CAI CAI
PRV
BD
BWS
NPT NPT NPT
GC
BWR
BF

14
5368 828 v1.6
Preparing the Connections (continued)
Boiler Connections
Dimensions overview without bottom piping connections
Connections Vitodens 100-W,
WB1B 26, 35
Legend
Connections
ACondensate drain, plastic hose
Ø 0.87” / 22 mm
BBoiler water supply, NPT ¾” (male
thread)
CGas connection, NPT ¾” (male
thread)
DBoiler water return, NPT ¾” (male
thread)
ECombustion air opening for double
pipe system
FCombustion air opening for coaxial
system
Dimensions
a See fig. 6 for dimensions
b 15¾” / 400 mm
c 2f” / 68 mm
d 28½” / 725 mm
e 47/8” / 123 mm
f 6d” / 156 mm
g 14d” / 360 mm
h 5” / 125 mm
j 97/8” / 250 mm
k 1a” / 31 mm
m 77/8” / 200 mm
n 3d” / 80 m
The maximum ambient temperature
must not exceed 104º F / 40º C.
gHeating water connections and
gas connection to be made
in the field. See Fig. 5 and
connection-specific section for
details.
gSee 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
“Wall Mounting” on page 16
of this manual for information
regarding the installation of
the wall mounting bracket.
Fig. 5 Front view Side view Top view

5368 828 v1.6
15
Boiler Connections
Preparing the Connections (continued)
This section is an overview only!
Refer to subsequent sections for
detailed information on individual
piping connections.
Piping connections for Vitodens
100-W, WB1B 26 and 35
(factory supplied)
Legend
BWR Boiler water return, ¾”
BWS Boiler water supply, ¾”
BD Boiler drain
BF Boiler fill
GC Gas connection, ¾” NPTM
(male thread)
PRV Pressure relief valve
PG Pressure gage
VC Venting connection
CAI Combustion air inlet
connection (optional)
Fig. 6
Fig. 7
Fi
g.
6
CAI
VC
CAI
PG
PRV
BD
BWS
GC
BF
BWR
Dimensions overview with piping connections

16
5368 828 v1.6
Wall Mounting
Boiler Connections
Wall mounting bracket installation
CAUTION
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.
Legend
AMounting template
BFinished floor level
Dimensions
a 12” / 300 mm
b min. 45” / 1143 mm
The Vitodens 100-W can be
wall-mounted on
ga brick/concrete wall
gwood studs
gmetal 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 e”/10 mm), using
mounting template supplied with
the boiler.
2. Align wall mounting bracket and
attach to wall with the screws and
plastic anchors supplied.
Fig. 8

5368 828 v1.6
17
Boiler Connections
Wall Mounting (continued)
Mounting bracket installation (continued)
Installation of mounting bracket on
wood and metal studs
To mount the Vitodens 100-W boiler
on wood or metal studs, install
mounting bracket on wall as shown
on previous page. Refer to drawings
on the left and below for more
detailed installation information.
Install mounting bracket on wood
studs as per illustration. Drill 3/16”
pilot holes to insert mounting bolts.
Ensure that holes are located in the
center of each wood stud.
Install mounting bracket on metal
studs as per illustration. Drill f” 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.
Fig. 10 Installation of mounting bracket on wood studs
Fig. 11 Installation of mounting bracket on metal studs
Fig. 9 Installation of mounting bracket

18
5368 828 v1.6
Wall Mounting (continued)
Boiler Connections
Mounting Vitodens 100-W boiler
Connections
Flue gas connection
1. Loosen the screws at the
bottom of the boiler; do not
remove completely.
2. Remove the front panel.
3. Mount boiler onto the mounting
bracket.
For installation of the
mounting bracket, see
subsection entitled
“Wall mounting bracket
installation” on page 16
of this manual.
Legend
ACombustion air
(for double pipe system)
BFlue gases
CCombustion air inlet cover
The Vitodens 100-W boiler comes
with a preinstalled vent pipe adaptor
(as shown).
Run venting system, single-pipe,
double-pipe or coaxial, through the
side wall or the roof, taking the
shortest possible route and at a rising
angle (min. 3º).
Installation Instructions
Vitodens Venting System.
For double pipe installation, the
combustion air inlet cover Cmust
be in place. Also refer to the Venting
Manual.
Remove and discard combustion air
inlet cover Cwhen installing coaxial
vent pipe system.
Fig. 13
Fig. 14

5368 828 v1.6
19
Boiler Connections
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
AWater supply connection
BCondensate drain connection
CGas connection
DWater return connection
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.
Fig. 15
Fig. 16
2 imperfect threads Use moderate amount of dope
Thread pipe right length Leave 2 threads bare

20
5368 828 v1.6
Connections (continued)
Boiler Connections
Gas connection and piping (continued)
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
Legend
AGas connection
BAccessible manual gas
shutoff (factory supplied)
CDrip leg
WARNING
The gas supply piping must be leak
tested before placing the boiler in
operation.
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”
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
Fig. 17