Viessmann Vitodens 100-W Quick guide

VITODENS 100-W 
Installation and Service
Instructions
for use by heating contractor
Vitodens 100-W
WB1B Series
Wall-mounted, gas-fired condensing boiler
Heating input 37 to 118 MBH
10 8 to 34 5 kW
Vitodens 100-W, WB1B
(with preinstalled coaxial vent pipe
adaptor)

Read and save these instructions
for future reference.
MPORTANT
This trademark is registered with the U S Patent and Trademark Office
Please file in Service Binder
5368 828 v1 1 08/2009

Safety, Installation and Warranty Requirements
2
Safety, nstallation and Warranty Requirements
Please ensure that these instructions are read and understood before commencing installation. Failure to comply with the
instructions listed below and details printed in this manual can cause product/property damage,severe personal injury, and/or loss
of life Ensure all requirements below are understood and fulfilled (including detailed information found in manual subsections)
HLicensed professional heating
contractor
The installation, service, and
maintenance of this equipment must
be performed by a licensed
professional heating contractor
"
Please see section
entitled “Important
Regulatory and
Installation
Requirements” in the
Installation Instructions.
HProduct documentation
Read all applicable documentation
before commencing installation Store
documentation near boiler in a readily
accessible location for reference in
the future by service personnel
"
For a listing of
applicable literature,
please see section
entitled “Important
Regulatory and
Installation Requirements”
in the Installation Instructions.
HAdvice 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
HCarbon monoxide
Improper installation, service and/or
maintenance can cause flue products
to flow into living space Flue
products contain poisonous carbon
monoxide gas
"
For information
pertaining to the proper
installation, service and
maintenance of this
equipment to avoid
formation of carbon monoxide, please
see the Installation Instructions of the
Vitodens Venting ystem.
HEquipment venting
Never operate boiler without an
installed venting system An improper
venting system can cause carbon
monoxide poisoning
HWarranty
Information contained in
this and related product
documentation must be
read and followed Failure
to do so may render
warranty null and void.
5368 828 v1 1
nstallers must follow local
regulations with respect to
installation of carbon monoxide
detectors. Follow manufacturer’s
maintenance schedule of boiler.
WARN NG

Index
3
Page
Safety
mportant Regulatory and nstallation Requirements 5
General nformation
About these nstallation nstructions 8
Applicability 9
Product nformation 9
Mechanical Room 10
Set-up
Before Set-up 12
Minimum Clearances 12
Boiler Connections
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
nstallation 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
5368 828 v1 1

Index
4
Control Connections
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
nitial Start-up,
nspection and Maintenance
Necessary Tools 40
Overview of Controls and ndicators 41
Overview of Components 43
Procedure (Overview) 44
Steps 45
Troubleshooting
Troubleshooting Steps 62
Overview of Controls and ndicators 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
Check fuses 71
Additional nformation
Electrical connections to the power / pump module
(room thermostat and DHW) 72
nput 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 nstructions 84
5368 828 v1 1

Safety
5
mportant Regulatory and nstallation Requirements
Codes
The installation of this unit shall be in
accordance with local codes or, in the
absence of local codes, use
CAN/CSA-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
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.
Special Requirements for Side-Wall Vented Appliances
n the Commonwealth of Massachusetts
The Commonwealth of Massachusetts requires compliance with regulation 248 CMR 4 00 and 5 00 for installation of
side-wall vented gas appliances as follows:
(a) For all side-wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole
or in part for residential purposes, including those owned or operated by the Commonwealth and where the side-wall
exhaust vent termination is less than (7) feet above finished grade in the area of the venting, including but not limited to
decks and porches, the following requirements shall be satisfied:
1 INSTALLATION OF CARBON MONOXIDE DETECTORS At the time of installation of the side-wall horizontal vented
gas fueled equipment, the installing plumber or gasfitter shall observe that a hard wired carbon monoxide detector
with an alarm and battery back-up is installed on the floor level where the gas equipment is to be installed In
addition, the installing plumber or gasfitter shall observe that a battery operated or hard wired carbon monoxide
detector with an alarm is installed on each additional level of the dwelling, building or structure served by the
side-wall horizontal vented gas fueled equipment It shall be the responsibility of the property owner to secure the
services of qualified licensed professional for the installation of hard-wired carbon monoxide detectors
a In the event that the side-wall horizontally vented gas fueled equipment is installed in a crawl space or an attic,
the hard-wired carbon monoxide detector with alarm and battery back-up may be installed on the next adjacent
floor level
b In the event that the requirements of this subdivision can not be met at the time of completion of installation, the
owner shall have a period of thirty (30) days to comply with the above requirements; provided, however, that
during said thirty (30) day period, a battery operated carbon monoxide detector with an alarm shall be installed
Continued on following page.
5368 828 v1 1

Safety
6
mportant Regulatory and nstallation Requirements (continued)
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
(c) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM PROVIDED When the manufacturer of
Product Approved side-wall horizontally vented gas equipment provides a venting system design or venting system
components with the equipment, the instructions provided by the manufacturer for installation of the equipment and the
venting system shall include:
1 Detailed instructions for the installation of venting system design or the venting system components; and
2 A complete parts list for the venting system design or venting system
(d) MANUFACTURER REQUIREMENTS - GAS EQUIPMENT VENTING SYSTEM NOT PROVIDED When the manufacturer of a
Product Approved side-wall horizontally vented gas fueled equipment does not provide the parts for venting the flue
gases, but identifies ”special venting systems”, the following requirements shall be satisfied by the manufacturer:
1 The referenced ”special venting system” instructions shall be included with the appliance or equipment installation
instructions; and
2 The ”special venting systems” shall be Product Approved by the Board, and the instructions for that system shall
include a parts list and detailed installation instructions
(e) A copy of all installation instructions for all Product Approved side-wall horizontally vented gas fueled equipment, all
venting instructions, all parts lists for venting instructions, and/or all venting design instructions shall remain with the
appliance or equipment at the completion of the installation
5368 828 v1 1

Safety
7
mportant Regulatory and nstallation 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
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.
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
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.
5368 828 v1 1

General Information
8
About these nstallation nstructions
Take note of all symbols and notations intended to draw attention to potential hazards or important product information.
These include ”WARN NG”, ”CAUT ON”, and ” MPORTANT”. See below.
Warnings draw your attention to the
presence of potential hazards or
important product information.
Cautions draw your attention to the
presence of potential hazards or
important product information.
Helpful hints for installation,
operation or maintenance which
pertain to the product.
This symbol indicates that additional,
pertinent information is to be found in
column three.
This symbol indicates that other
instructions must be referenced.
5368 828 v1 1
ndicates an imminently hazardous
situation which, if not avoided, could
result in death, serious injury or
substantial product/property damage.
WARN NG
ndicates an imminently hazardous
situation which, if not avoided, may
result in minor injury or
product/property damage.
CAUT ON
MPORTANT

General Information
9
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/NB serial number correlate to
each other. Providing either serial
number is sufficient.
Model No. Serial No
WB1B 10-26
7374861
and
WB1B 10-35
7374862
Product nformation
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
5368 828 v1 1
MPORTANT
Serial No location
(16-digit bar code white la-
bel located on the boiler as
shown in this drawing)
ASME/NB stamp 12-digit-
serial number location
(metallic plate riveted on the
heat exchanger)
Fig. 1

General Information
10
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 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
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 1
MPORTANT

General Information
11
Mechanical Room (continued)
nstallation area conditions
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
f you notice fire coming from the
appliance, call the fire department
immediately! Do not attempt to
extinguish the fire unless qualified to
d
o
s
o
.
WARNING
Fire causes a risk of burns and
explosion!
H
HH
HShut down the boiler
H
HH
HClose fuel shut-off valves
H
HH
HUse a tested fire extinguisher,
class ABC.
WARNING
ncorrect ambient conditions can lead
to damage to the heating system and
put safe operation at risk.
WARNING

General Information/Set-up
12
Before Set-up
Before placing boiler in its installation
location, ensure all necessary
accessories are installed
Minimum Clearances
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
ee the Vitodens Venting
ystem Installation
Instructions.
Clearance to combustibles
Top Front Rear Left Right Vent pipe
*1
0 0 AL,
CL
0 0 0 0
AL = Alcove
CL = Closet
*1
Refer to the Installation Instructions of the
Vitodens Venting ystem for details.
The boiler must be installed in such a
way that gas ignition system
components are protected from
water (spraying, splashing, etc.)
during boiler operation and service.
CAUT ON
Front
12” / 30 cm
Top
*
12” / 30 cm
0” / mm
28” / 700 mm
Side
0” / mm
Back
Side
Fig. 2
12” / 30 cm
*
4” / 10 cm
28” /
70 cm
¼” / 5 mm ¼” / 5 mm¼” / 5 mm
Fig. 3

Boiler Connections
13
Preparing the Connections
Use an approved pipe sealant or teflon tape when
connecting the following installation fittings.
Connections overview
This section is an overview only! Refer
to subsequent sections for detailed
information on individual piping
connections.
Piping connections for Vitodens
100-W, WB1B 10-26 and 10-35
(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)
5368 828 v1 1
BWS
BWR
NPT
GC
PRV
BD
BF
VC
NPT NPT
CAI CAI
Fig. 4

Boiler Connections
14
Preparing the Connections (continued)
Dimensions overview without bottom piping connections
Connections Vitodens 100-W,
WB1B 10-26, 10-35
Legend
Connections
Condensate drain, plastic hose
Ø 0 87” / 22mm
Boiler water supply, NPT ¾” (male
thread)
Gas connection, NPT ¾” (male
thread)
Boiler 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 2
5
/
8
” / 68 mm
d 28½” / 725 mm
e 4
7
/
8
” / 123 mm
f 6
1
/
8
” / 156 mm
g 14
1
/
8
” / 360 mm
h 5” / 125 mm
j 9
7
/
8
” / 250 mm
k 1
1
/
4
” / 31 mm
m 7
7
/
8
” / 200 mm
n 3
1
/
8
” / 80 m
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.
The maximum ambient temperature
must not exceed 104ºF / 40ºC.
HHeating water connections and gas
connection to be made in the field
See Fig 5 and connection-specific
section for details
HSee subsection entitled “Power
supply connection” for details
regarding power supply to the
Vitodens 100-W boiler
5368 828 v1 1
a
b
ee
f
g
h
B
A
DC
nn
m
E F E
j
c
d
k
Fig. 5 Front view Top view
ide view
MPORTANT

Boiler Connections
15
Preparing the Connections (continued)
Dimensions overview with piping connections
This section is an overview only! Refer
to subsequent sections for detailed
information on individual piping
connections.
Piping connections for Vitodens
100-W, WB1B 10-26 and 10-35
(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)
5368 828 v1 1
14” /
355mm
15¾” /
400mm
2
7
/
8
” / 73mm
27½” / 700mm
33” / 838mm 12” / 300mm
2
5
/
8
” /
68 mm
6” /
152mm 4
7
/
8
” /
123mm
4
7
/
8
” /
123mm
VC
CAI CAI
PG
Fig. 6
28½” / 725 mm
32½” / 826 mm
PRV
BD
GC BF
BWS
BWR
Fig. 7

Boiler ConnectionsBoiler Connections
16
Wall Mounting
Wall mounting bracket installation
Legend
Mounting template
Finished floor level
Dimensions
a 12” / 300mm
b min 45” / 1143mm
The Vitodens 100-W can be
wall-mounted on
Ha brick/concrete wall
Hwood studs
Hmetal studs
Following are the installation
instructions for the mounting bracket
on each material Skip to the
installation instructions applicable to
your installation requirements
nstallation of mounting bracket on
brick/concrete wall:
1. Drill holes (Ø
3
/
8
”/10 mm), using
mounting template supplied with the
boiler
2. Align wall mounting bracket and
attach to wall with the screws and
plastic anchors supplied
5368 828 v1 1
Ø
3
/
8
” /
10mm
2x
1
2
a
b
Fig. 8
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
s
a
f
e
t
y
h
a
z
a
r
d
.
CAUT ON
5368 828 v1 1

Installation of mounting bracket
a
a = 16” / 406 mm
Fig. 9
Installation of mounting bracket on wood studs
16” / 406 mm
3/16”
2x
Fig. 10
Installation of mounting bracket on metal studs
5/8”
2x
16” / 406 mm
Fig. 11
17
Wall Mounting (continued)
Mounting bracket installation (continued)
nstallation 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
5
/
8
” pilot holes
to insert mounting bolts Ensure that
holes are located in the center of each
metal stud Secure mounting bracket
with bolts to metal studs as shown

Boiler Connections
Boiler Connections
18
Wall Mounting (continued)
Mounting Vitodens 100-W boiler
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.
Connections
Flue gas connection
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 ystem.
2
3
1
2x
Fig. 13
5368 828 v1 15368 828 v1 1
BA
B
A
A
For double pipe installation, the
combustion air inlet cover C
must be in place Also refer to
the Venting Manual
Remove and discard combustion
air inlet cover Cwhen installing
coaxial vent pipe system
Fig. 14
C

Boiler Connections
19
Connections (continued)
Proper piping practice
Support piping by proper suspension
method Piping must not rest on or be
supported by boiler
Gas connection and piping
Legend
Water supply connection
Condensate drain connection
Gas connection
Water 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
5368 828 v1 1
U
s
e
m
o
d
e
r
a
t
e
a
m
o
u
n
t
o
f
d
o
p
e
Leave 2 end threads bare
T
hread pipe right length
2
i
m
p
e
r
f
e
c
t
t
h
r
e
a
d
s
Fig. 15
¨
zz
Fig. 16

Boiler Connections
20
Connections (continued)
Gas connection and piping (continued)
Legend
Gas connection
Accessible manual gas shutoff
(factory supplied)
Drip leg
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
5368 828 v1 1
Fig. 17
5368 828 v1 1
MPORTANT
The gas supply piping must be leak
tested before placing the boiler in
operation.
WARN NG
Ensure that gas piping is large
enough for all appliances in the
residence. No noticeable gas
pressure drop in the gas line must
occur when any unit (or combination
o
f
u
n
i
t
s
)
l
i
g
h
t
s
o
r
r
u
n
s
.
CAUT ON
MPORTANT