Dunkirk XEB-2 User manual

INSTALLATION MANUAL
DUNKIRK BOILERS
85 Middle Rd.
Dunkirk, NY 14048
www.dunkirk.com
An ISO 9001-2000 Certied Company
P/N 14683001, Rev. 2.1 [02/08]
XEB SErIES
GAS-FIrEd HOT WATEr INdUcEd drAFT BOILErS

2
! !
Boiler Ratings and Capacities
New York City MEA Number 484-84-E Vol. IV.
The Ratings marked “Net I=B=R Ratings” indicate the
amountofremainingheatinputthatcanbeusedtoheat
the radiation or terminal units. The Net I=B=R Ratings
shownarebasedonanallowanceof1.15inaccordance
with the factors shown on the I=B=R Standard as
published by The Hydronics Institute.
DESIGN CERTIFIED FOR
NATURALAND PROPANE GAS
RATINGS NATURAL AND PROPANE GAS
Model Number of
Sections Input
*MBH
+Heating
Capacity
*MBH
Net IBR
Rating
*MBH
Width
A
Vent Diameter (Inches)
To Chimney
(Category I) Horizontal Vent (Category III)
XEB-2
2 42.5 36 31 11 4 3
XEB-3
3 75.0 63 55 14¼ 4 3
XEB-4
4 112.5 94 82 17½4 3
XEB-5
5 150.0 125 109 20¾4 3
XEB-6
6 187.5 155 135 24 4 4
XEB-7
7 225.0 186 162 27¼ 4 4
* MBH = 1,000 Btuh = British Thermal Unit Per Hour. Boilers are equipped for altitudes up to 2,000 feet only. U.S.A. Only - For altitudes above 2,000 feet, ratings should be reduced at the
rat of 4% for each 1,000 feet above sea level. Canada Only - Boilers may be used at high altitude by using a certied eld conversion, kit, resulting in a 10% de-rate.
+ Heating Capacity based on D.O.E. (Department of Energy) test procedure.
Figure #1
Thisboilercannotbeusedwithalltypesofchimneys.Read
these instructions carefully before installing.
TheseGas-FiredHotWaterBoilersarelowpressure,sectionalcastiron
boilers Design Certied by C.S.A. (Canadian Standards Association)
for use with Natural and Propane Gases. They are constructed and
hydrostatically tested for a maximum working pressure of 50 psi in
accordance with A.S.M.E. Boiler and Pressure Vessel Code Section
IV Standards for cast iron heating boilers.
INSTALLATION INSTRUCTIONS
These instructions must be afxed on or adjacent to the boiler.
WARNING
Improper installation, adjustment,
alteration, service or maintenance
can cause injury or property damage.
Refer to this manual. For assistance
or information consult a qualified
installer, service agency or the gas
supplier.
Selection of boiler size should be based upon “Net
I=B=R Rating” being equal to or greater than the
calculated heat loss of the building.
Themanufacturershouldbe consultedbeforeselecting
a boiler for installations having unusual piping and
pickup requirements.

3
Check to be sure you have the right size boiler before
starting the installation. See rating and capacity table
on previous page. Also be sure the new boiler is for
the type of gas you are using. Check the rating plate
on the right side of the boiler.
Verify that the boiler is supplied with the correct
type of gas, fresh air for combustion, and a suitable
electricalsupply.Also,theboiler must be connected to
asuitablechimneyorhorizontalventingsystemandan
adequatepipingsystem.Finally,athermostat,properly
located, is needed for control of the heating system. If
you have any doubts as to the various requirements,
check with local authorities and obtain professional
help where needed. Take the time to complete all of
the steps for SAFE and PROPER operation of the
heating system.
Ifthisboilerisinstalledina buildingunderconstruction,
special care must be taken to insure a clean
combustionairsupplyduringtheconstructionprocess.
BEFORE YOU START
KEEP BOILER AREA CLEAN AND FREE FROM COMBUSTIBLE MATERIALS, GASOLINE
AND OTHER FLAMMABLE VAPORS AND LIQUIDS
Installers -Followlocalregulationswithrespectto
installation of CO detectors. Follow maintenance
recommendations in this instruction manual.
BOILER RATINGS AND CAPACITIES
BOILERS FOR USE AT HIGH ALTITUDE
Thisboilerisfactoryequippedforuseataltitudesof0-2,000
feet abovesea level.Foruseataltitudesabove2,000 feet
abovesealevel, the input ratings are reduced byachange
in main burner orice size.
U.S.A. Only - For altitudes above 2,000 feet above
sea level, input ratings should be reduced at the rate
These boilers must stand on a noncombustible oor.
If installed on a combustible oor, please refer to the
Repair Parts section in the back of this manual for the
appropriate Combustible Floor Base part number.
These Gas-Fired Hot Water Boilers are low pressure,
sectional cast iron boilers Design Certied by CSA
(Canadian Standards Association) for use with Natural
and Propane Gases. They are constructed and
hydrostatically tested for a maximum working pressure
of 50psi (pounds per square inch) in accordance with
A.S.M.E. (American Society of Mechanical Engineers)
Boiler and Pressure Vessel Code Section IV Standards
for cast iron heating boilers.
of 4% for each 1,000 feet above sea level. Consult the
National Fuel Gas Code (NFPA54/ANSI Z223.1-latest
revision), or the manufacturer for correct orice sizing
information. High altitude orices are available from
the boiler manufacturer.
Canada Only - For altitudes in the range of 2,000-4,500
feet above sea level, boilers may be eld equipped for use
at high altitude by using a certied eld conversion kit. The
change in main burner orice size results in the boiler’s
inputratingbeing reduced by 10%.The conversion shall be
carried out by a manufacturer’s authorized representative,
in accordance with the requirements of the manufacturer,
provincial or territorial authorities having jurisdiction and
in accordance with the requirements of the CSA-B149.1
and CSA-B149.2 Installation Codes. The certied eld
conversion kit includes a conversion data plate, which
must be attached to the boiler adjacent to the rating
plate, indicating that the boiler has been converted for
high altitude use. The conversion data plate must be
lled in with the correct conversion information.
Airborne particulates such as from drywall dust and
from berglass insulation can clog the burner ports
and cause incomplete combustion and sooting.
Where required by the authority having jurisdiction,
the installation must conform to American Society of
Mechanical Engineers Safety Code for Controls and
Safety Devices for Automatically Fired Boilers, No.
CSD-1.
The installation must conform to the requirements of
the authority having jurisdiction or, in the absence of
such requirements, to the National Fuel Gas Code,
ANSI Z223.1-latest revision.
In Canada, the boiler shall be installed according to
CSA-B149.1and.2,InstallationCodefor GasBurning
Appliances and Equipment.

4
If the boiler is part of a planned heating system,
locate it where shown on your plan. If boiler is to
be part of an existing system, it is usually best to
putitwheretheoldonewas.Ifyouplantochange
location,you willneedadditional materialsaswell
as an adequate base. The following rules apply:
1. The boiler must be level. Metal shims may be
used under base legs for nal leveling.
2. Use a raised base if oor can become wet or
damp.
3. The vent pipe connection should be as short
as possible.
LOCATING THE BOILER
4. Additional clearances for service may exceed
clearances for re protection. Always comply
with the minimum re protection clearances
shown on the boiler. An 18 inch clearance
should be maintained on any side where
passage is required to access another side for
cleaning, servicing, inspection or replacement
of any part that may need attention. An 18 inch
clearance is recommended on the control side
for servicing.
Figure #2 Shows minimum clearances to
combustibleconstruction.Roomsthat arelarge
in comparison with the size of the boiler are
dened as rooms having a volume equal to or
greater than 16 times the volume of the boiler.
Where the actual ceiling height of a room is
greater that 8’, the volume of a room shall be
gured on the basis of a ceiling height of 8’.
Determination of room size should be based
on the total volume of all gas red equipment
installed in the room. Consult the National Fuel
Gas Code for further information, including
approved methods for reducing clearances in
large room.
5. Equipment shall be installed in a location
in which the facilities for ventilation permit
satisfactory combustion of gas, proper venting,
and maintenance of ambient temperature at
safe limits under normal conditions of use.
Equipmentshallbelocatedsoasnottointerfere
with proper circulation of air. When normal
inltration does not provide the necessary air,
outside air shell be introduced (see Following
Page - “Fresh Air for Combustion”).
THIS UNIT MUST BE SET ON A CONCRETE OR OTHER
NONCOMBUSTIBLE MATERIAL BASE OR FLOOR. IT MUST NOT
BE INSTALLED ON CARPETING.
6. Advise owner to keep air passages free of
obstructions. Ventilating and combustion air
must enter boiler room without restrictions.
7.The floor supporting the boiler must be
noncombustible.Ifitis combustible,pleaserefer
to the Repair Parts section in the back of this
manual for the appropriate Combustible Floor
BOILER MINIMUM CLEARANCE TO COMBUSTIBLES
Unit Alcove, or Room Not Large in Comparison
With Boiler
Room Larger in
Comparison With
Boiler
Top 6” 6”
Rear 6” 6”
Control Side 8” 8”
Opposite Side 6” 6”
Front 18” 18”
Flue/Vent Connector 6” 6”
Near Boiler Piping 1” 1”
This unit must be set on a concrete or other noncombustible material
base or oor. IT MUST NOT BE INSTALLED ON CARPETING.
BOILER
Rear
Front
Control Side
Opposite Side
8”
18”
6”
6”
Figure #2
BOILER VOLUME SPECIFICATIONS
Boiler Size
(Number of
Sections)
Boiler
Volume
(Cu. Ft.)
Minimum Room
Volume Required To Be
Large Room (Cu. Ft.)
2 4.3 68.7
3 5.6 89.0
4 6.8 109.3
5 8.1 129.5
6 9.4 149.8
7 10.6 170.1

5
LOCATING THE BOILER
You must provide for enough fresh air to assure
proper combustion. The fire in the boiler uses
oxygen. It must have a continuous supply. The air
in a house contains only enough oxygen to supply
the burner for a short time. Outside air must enter
thehousetoreplacethatusedbytheburner. Study
followingexamples1and2todetermineyourfresh
air requirements.
EXAMPLE 1: Boiler Located In Unconned Space
An unconned space is dened as a space whose
volume is not less than 50 cubic feet per 1,000 Btu
per hour of the total input rating of all appliances
installed in that space.
If your boiler is in an open area (un-partitioned
basement) in a conventional house, the air that leaks
through the cracks around doors and windows will
usually be adequate to provide air for combustion.
The doors should not t .tightly. Do not caulk the
cracks around the windows.
Equipmentlocatedinbuildingsoftightconstruction
shallbeprovidedwithairforcombustion,ventilation,
and dilution of flue gases using the methods
described in example 2b or shall be specially
engineered. The authority having jurisdiction must
approve specially engineered installations.
NOTE:If you use a replace or a kitchen or bath-
room exhaust fan, you should install an outside
air intake. These devices will rob the boiler and
water heater of combustion air.
FRESH AIR FOR COMBUSTION
Provision for combustion and ventilation air
must be in accordance with the National Fuel Gas
Code, ANSI Z223.1- latest revision, or applicable
provisions of the local building codes.
! !
WARNING
Be sure to provide enough fresh air for
combustion. Enough air insures proper
combustion and assures that no hazard will
develop due to the lack of oxygen.
EXAMPLE 2: Boiler Located In Conned Space
A. AllAir From Inside The Building: The conned
space shall be provided with two permanent
openingscommunicatingdirectlywithanadditional
room(s) of sufcient volume so that the combined
volume of all spaces meets the criteria for an
unconned space. The total input of all gas utilization
equipment installed in the combined space shall
be considered in making this determination. Each
opening shall have a minimum free area of one
square inch per 1,000 Btu per hour of the total input
rating of all gas utilization equipment in the conned
space, but not less that 100 square inches. One
opening shall be within 12 inches of the top and one
within12inchesofthebottomoftheenclosure.The
minimumdimensionofairopeningsshallnotbeless
than 3 inches (see Figure #3A).
Base part number. We use a 2” Cladlite pad as
a combustible oor base. These are available
from your local supplier. Use 24” x 30” pad for
2-5 section boilers, and a minimum 30” x 30”
pad for 6-7 sections boilers. The boiler must be
centered on the combustible oor base.
8.Theboilershallbeinstalledsuchthattheautomatic
gas ignition system components are protected
from water (dripping, spraying, rain, etc.) during
appliance operation and service (circulator
replacement, control replacement, etc..)
Figure #3A

6
FRESH AIR FOR COMBUSTION
FRESH AIR DUCT CAPACITIES (1 Square inch per 4,000 Btuh)
Fresh Air
Duct Size 100% Free Area 1/4” Wire Mesh
75% Free Area
Metal Louvers 25% Free Area Wood Louvers
3” x 12” 144,000 108,000 36,000
8” x 8” 256,000 192,000 64,000
8” x 12” 384,000 288,000 96,000
8 ½” x 16” 512,000 384,000 128,000
FRESH AIR DUCT CAPACITIES (1 Square inch per 2,000 Btuh)
Fresh Air
Duct Size 100% Free Area 1/4” Wire Mesh
75% Free Area
Metal Louvers 25% Free Area Wood Louvers
3” x 12” 72,000 54,000 18,000
8” x 8” 128,000 96,000 32,000
8” x 12” 192,000 144,000 48,000
8 ½” x 16” 256,000 192,000 64,000
B. All Air From Outdoors: The confined
space shall communicate with the outdoors in
accordance with methods 1 or 2. The minimum
dimension of air openings shall not be less than
3 in. Where ducts are used, they shall be of the
same cross-sectional area as the free area of the
openings to which they connect.
1.Twopermanentopenings,onecommencingwithin
12inchesofthetop,andonecommencing within
12 inches of the bottom, of the enclosure shall
be provided. The openings shall communicate
directly, or by the ducts, with the outdoors or
spaces (crawl or attic) that freely communicate
with the outdoors.
a) Where directly communicating with the outdoors
or where communicating to the outdoors
throughverticalducts,eachopeningshallhave
a minimum free area of 1 sq. in, per 4000 Btu
per hour of total input rating of all equipment
in the enclosure (see Figure #3B).
Figure #3B
b) Where communicating with the outdoors
through horizontal ducts, each opening shall
haveaminimumfreeareaof1areaofsq.in.per
2000Btuperhouroftotalratingofallequipment
in the enclosure (see Figure #3C).
Figure #3C
2. One permanent opening commencing with
12 inches of the top of the enclosure, shall be
permitted where the equipment has clearance
of at least 1 inch from the sides and back and 6
inchesformthefrontoftheappliance.Theopening
shell directly communicate with the outdoors or
shallcommunicatethroughaverticalorhorizontal
duct to the outdoors or to a crawl space or attic
that freely communicate with the out doors, and
shall have a minimum free area of:

7
FRESH AIR DUCT CAPACITIES (1 Square inch per 3,000 Btuh)
Fresh Air
Duct Size 100% Free Area 1/4” Wire Mesh
75% Free Area
Metal Louvers 25% Free Area Wood Louvers
3” x 12” 108,000 81,000 27,000
8” x 8” 192,000 144,000 48,000
8” x 12” 288,000 216,000 72,000
8 ½” x 16” 384,000 288,000 96,000
Figure #3D
FRESH AIR FOR COMBUSTION
a) 1 sq. inch per 3000 Btu per hour of the
total input of all equipment located in the
enclosure, and the front of the appliance
(see Figure #3D).
b) Not less than the sum of the areas of all vent
connectors in the conned space.
INSTALLATION-SYSTEM PIPING
1. Place boiler in the selected location (as near
chimney as possible). Your boiler is shipped
assembled.Youneedonlytoinstallthecirculator,
ballvalvesthereliefvalvewithadrainlinetocarry
any water to a drain, and the drain valve.
2. Install Relief Valve on 3/4”pipe nipple in tapped
opening in the left end section. Connect a
drain line of the same pipe size (3/4” to carry
any water away to a drain. No shutoff of any
description shall be placed between the safety
relief valve and the boiler, or on discharge pipes
betweensuchsafetyvalvesandtheatmosphere.
Installationofthesafetyreliefvalveshallconform
to the requirements of the ANSI/ ASME Boiler and
Pressure Vessel Code, Section IV.
3. Install Drain Valve on lower left side of boiler
as marked.
4.InstallTemperatureandPressureGaugeinto¼”
bushing threaded in tee furnished with supply
piping (see Figures #4 and #5)
FORCED HOT WATER TYPICAL PIPING
Figure #4

8
INSTALLATION-SYSTEM PIPING
If you are installing an entire new heating
system, rst install all of your radiation units
(panels, radiators or cabinets) and the Supply
and Return Mains - then make the connections
at the boiler.
In connecting the cold water supply to the water
valve, make sure that a clean water supply is
available. When the water supply is from a well
or pump, a sand strainer should be installed at
the pump.
Figure #5
FORCED HOT WATER TYPICAL PIPING
WITH ZONE CONTROL VALVE
A hot water boiler installed above radiation level
must be equipped with a low water cutoff device.
A periodic inspection is necessary, as is ushing
of oat type devices, per manufacturers specic
instructions.
Figure #6
PIPING ARRANGEMENTS
FOR BOILER WHEN USED IN CONNECTION
WITH REFRIGERATION SYSTEM
When the boiler is used in connection with
refrigeration systems it shall be installed so that
the chilled medium is piped in parallel with the
heating boiler with appropriate valves to prevent
the chilled medium from entering the heating
boiler (Figure #6).
If the boiler is connected to heating coils located
in air handling units where they may be exposed
to refrigerated air circulation, the piping system
shall be equipped with ow control valves or other
automatic means to prevent gravity circulation of
the boiler water during the cooling cycle.
5. Connect Supply and Return Lines to boiler.
The connections may require certain
additional ttings and parts, as shown in the
diagrams in Figures #4 and #5.

9
INSTALLATION-SYSTEM PIPING
! !
Figure #7
Low Design Water Temperature Systems
(Below 140° F) And Large Water Content
Systems:
WARNING
Signicant condensation may form in this
boiler and/or the venting system if the boiler
is operated with return temperatures of less
than 120° F.
This condensation is corrosive and can eventu-
ally cause severe damage to the boiler and vent-
ing system. The minimum design return water
temperature to prevent this condensation in the
boiler and venting is 120°F. The minimum high
limit setting is 140°F.
If the boiler is to be used in a heating system
where design water temperatures below 140°F
are desired (e.g. radiant oor heating), a 3-way
or 4-way mixing valve or suitable alternative (e.g.
bypass piping, Figure #7) is required to prevent
low temperature (below return 120°F) return wa-
ter from entering the boiler. When using a mix-
ing valve, follow the manufacturer’s installation
instructions.
If the boiler is to be connected to a system hav-
ing a large water content (such as a former grav-
ity system), it is suggested to use bypass piping
shown in Figure #7.
CHIMNEY AND VENT PIPE CONNECTION
For boilers for connection to gas vents or chimneys, vent installations shall be in
accordance with the National Fuel Gas Code, ANSI Z223.1- latest revision and applicable
provisions of the local building codes.
CHECK YOUR CHIMNEY
This is a very important part of your heating
system. It must be clean, the right size, properly
constructed and in GOOD CONDITION. Noboiler
can function properly with a bad chimney.
1. UselocalcodesforinstallationorNationalFuel
Gas Code Z223.1-latest revision. In Canada,
follow CSA B149.1 or .2 Installation Codes. It
is very important to properly size the venting
system for induced draft appliances. Consult
the Vent Sizing Tables, in the National Fuel
Gas Code ANSI Z223.1-latest revision for
correct sizing information. In Canada, consult
the Vent Sizing Tables, Amendment #1 to
CSA-B149.1 and .2 Installation Codes.
2. The boiler’s induced draft blower has a 3”
outlet. A 3” X 4” increaser tting is included in
the parts bag. Locate the increaser tting on the
outlet of the induced draft blower, and secure
gastight with a bead of the furnished silicone
sealant. The increaser tting is required on
this boiler for Category I venting, and 4” is the
minimum permissible vent diameter. This does
not imply that the vent connector is intended to
be 4” diameter pipe. The vent connector shall
be sized according to the appropriate venting

10
CHIMNEY AND VENT PIPE CONNECTION
tables in the National Fuel Gas Code or the
Canadian Installation Codes, and may be
required to be larger than 4” diameter.
The boiler installation for chimney venting
is not complete unless the 3” x 4” increaser
tting is located and secured.
3. These are high efciency boilers with a low
stack or exhaust temperature.
4. If venting into a masonry chimney without a
liner, linethechimney from top tobottom with
either:
a. listed Type B vent pipe
b. listed exible vent liner
c. poured ceramic liner.
5. Outside chimneys should not be used unless
they are either:
a. enclosed in a chase, or
b. Iined with Type B vent pipe, or listed exible
vent liner, or other certied chimney lining
system.
6. The vent connector from the boiler to the
chimney should run as directly as possible
with as few elbows as possible.
7. Wherepossible,itisrecommendedtocommon
vent the water heater and boiler. Consult the
appropriate Vent Sizing Tables in either the
National Fuel Gas Code, or the Canadian
Installation Codes for specic requirements
of multiple appliance venting.
8. If the boiler is the only appliance connected
tothe vent,TypeB ventpipe isrecommended
for the vent connector.
9. Slope pipe up from boiler to chimney not
less than 1/4” per foot.
10. End of vent pipe must be ush with the inside
face of the chimney ue. Use a sealed-in
thimble for the chimney connection.
11. The sections of vent pipe should be fastened
with sheet metal screws to make the piping
rigid. Use stovepipe wires to support the pipe
from above.
12. Do not connect to replace ue.
13. Do not install a damper on this boiler.
MINIMUM VENT PIPE CLEARANCE
If the vent pipe must go through a crawl space,
Type B vent pipe should be used. Where vent
pipe passes through a combustible wall or
partition, use a ventilated metal thimble. The
thimble should be 4 inches larger in diameter
than the vent pipe.
If boiler is installed with single wall vent, it must
have a 6” clearance between its surface and any
combustible material. A new Type B gas vent or
exible liner must be installed in accordance with
the instructions furnished with the vent. Maintain
clearances as specied for the vent pipe.
Check the vent pipe to see if it is re-stopped
where it goes through the oor or ceiling. It should
have an approved vent cap with clearances from
the roof as shown in Figure#8. If clearances are
less than shown in Figure #8, have the vent
checked by local authorities.
For boilers for connection to gas vents or
chimneys, vent installations shall be in
accordance with the National Fuel Gas Code,
ANSI Z223.1-latest revision and applicable
provisions of the local building codes. In
Canada, follow CSA B149.1 or .2 Installation
Codes.
Vent connectors serving appliances vented by
natural draft shall not be connected into any
portion of mechanical draft systems operating
under positive pressure.

11
CHIMNEY AND VENT PIPE CONNECTION
Figure #8
TYPE B GAS VENT
BOILER
CHECK YOUR CHIMNEY
This is a very important part of your
heating system. It must be clean, the right
size, properly constructed and in GOOD
CONDITION. No boiler can function
properly with a bad chimney. Use local
codes for installation or National Fuel Gas
Code Z223.1-latest revision. In Canada,
followCSAB149.1or.2InstallationCodes.
It is very important to properly size the
ventingsystemforinduceddraft appliances.
Consult the Vent Sizing Tables, in the
National Fuel Gas Code ANSI Z223.1-
latestrevisionforcorrectsizinginformation.
In Canada, consult the Vent Sizing Tables,
Amendment #1 to CSA-B149.1 and .2
Installation Codes.

12
REMOVING EXISTING BOILER FROM COMMON VENTING SYSTEM
4.Placeinoperationtheappliancebeinginspected.
Followthelightinginstructions.Adjustthermostat
so appliance will operate continuously.
5. Test for spillage at the hood relief opening after
5 minutes of main burner operation. Use the
ame of a match or candle, or smoke from a
cigarette, cigar or pipe.
6. Afterithasbeendeterminedthateachappliance
remaining connected to the common venting
system properly vents when tested as outlined
above, return doors, windows, exhaust fans,
replace dampers and any other gas-burning
appliance to their previous conditions of use.
7.Any improper operation of the common venting
system should be corrected so the installation
conforms with the National Fuel Gas Code,
ANSI Z223.1-latest revision. When resizing
any portion of the common venting system,
thecommon venting system shouldbe resized
to approach the minimum size as determined
using the appropriate tables in the National
Fuel Gas Code, ANSI Z223.1-latest revision.
In Canada, follow CSAB149.1 or.2 Installation
Codes.
CHIMNEY AND VENT PIPE CONNECTION
When an existing boiler is removed from a
common venting system, the common venting
system is likely to be too large for proper venting
of the appliances remaining connected to it.
At the time of removal of an existing boiler,
the following
steps shall be followed with each
appliance remaining connected to the common
ventingsystemplacedinoperation,whiletheother
appliance remaining connected to the common
venting system are not in operation.
1. Seal any unused openings in the common
venting system.
2. Visually inspect the venting system for proper
size and horizontal pitch and determine there
isnoblockageorrestriction,leakage,corrosion
and other deciencies which could cause an
unsafe condition.
3. Insofar as is practical, close all building doors
and windows and all doors between the space
in which the appliances remaining connected
tothe commonventingsystemarelocatedand
other spaces of the building. Turn on clothes
dryers and any appliance not connected to the
common venting system. Turn on any exhaust
fans, such as range hoods and bathroom
exhausts, so they will operate at maximum
speed. Close replace dampers.
NOTE: It is recommended that existing gas
vents be checked to be sure they meet local
codes.

13
INDUCED DRAFT HIGH EFFICIENCY BOILERS
MaximumHorizontalVentLengthFor Stainless
Steel Vent Pipe - 30’ Plus One 90º Elbow Plus
Vent Terminal
Minimum Horizontal Vent Length - 2’ Plus One
90º Elbow Vent Termination
Additional elbows are equivalent to 6 feet of
straight pipe for 4” diameter 90° elbow or 3 feet
of straight pipe for 3” diameter 90° elbow 2, 3,
4, 5, Section Boilers use 3” vent pipe for 6, 7
Section Boilers use 4” vent pipe.
CHOICE OF VENT PIPE MATERIAL
a)U.L.ListedZ-FlexZ-VentStainlessSteelVentPipe.
b)U.L.Listed Heat-Fab Saf-T-VentStainlessSteelVent Pipe.
c)U.L.ListedFlex-LStar-34StainlessSteelVentPipe.
d) U.L. Listed ProTech Systems FasNSeal Stainless Steel Vent
Pipe.
HORIZONTAL VENTING ACCESSORIES PART NUMBERS
Description Part Number
3" side Wall Vent Hood (Tjernlund VH-1-3") 14629010
4" side Wall Vent Hood (Tjernlund VH-1-4") 14629011
3" Thimble (Simpson 905295) 14629013
4" Thimble (Simpson 915295) 14629014
HORIZONTAL VENTING INSTRUCTIONS
Figure #9

14
1.Theseboilersmaybeventedhorizontallyasshown
in Figure #9. The vent pipe is pitched DOWN from
the boiler to the vent termination. Do not connect
other appliances to this vent.
2. Vent Pipe Material:
a) UL Listed Z-Flex Z-Vent stainless steel vent
pipe from boiler to vent termination,
-or-
b) UL Listed Heat-FabSaf-T-Vent stainless steel
vent pipe from boiler to vent termination,
-or-
c) UL Listed Flex-L StaR-34 stainless steel vent
pipe from boiler to vent termination,
-or-
d) UL Listed ProTech FasNSeal stainless steel
vent pipe from boiler to vent termination.
3. Clearance to Combustible Materials:
For stainless steel vent pipe maintain 6” minimum
air space clearance to combustible materials.
4. Vent Pipe Size:
a) 2, 3, 4 and 5 section boilers use 3” vent pipe
connected directly to the outlet of the induced
draft blower.
b) 6 and 7 section boilers use 4” vent pipe, starting
witha3”to4”stainlesssteelventpipetransition
that is connected directly to the outlet of the
induced draft blower. Do not use 3” vent pipe
on 6 or 7 section boilers.
5. Vent Pipe Length:
a) For stainless steel vent pipe, the maximum
horizontal vent length is 30 feet plus one 90°
elbow plus termination tting.
b) Minimum horizontal vent length for all vent
materials is 2 feet plus one 90° elbow plus
termination tting.
c) For additional elbows reduce the maximum
vent length as shown:
• 3” - 90° elbow - reduce vent length 3 feet per
each 3” elbow
• 4” - 90° elbow - reduce vent length 6 feet per
each 4” elbow
6. Vent Termination Fitting:
For all vent pipe materials, you may use either:
a) a 90° elbow pointing down, tted with a minimum
1/4” mesh screen to keep out rodents and birds.
The elbow shall be of the same material and
size as vent pipe. The elbow exit should be at
least 6” away from exterior wall as shown in
Figure 9.
-or-
b) Tjernlund VH-1 Series side wall vent hood. For
2, 3, 4, 5 section boilers use VH-1-3”, For 6, 7
section boilers use VH-1-4”.
7. Vent Pipe Termination Location (Figure #10):
a) When venting through combustible walls,
combustible clearances must be considered.
The VH-1 Side wall vent hood provides both
the outside vent termination and a double wall
pipe for passing through a combustible wall up
to 8” thick (VH-1-4”) or 9” thick (VH-1-3”). The
hole in the wall must be 6¼” square for 3” vent
pipe and 7 1/2” square for 4” vent pipe, in order
toinserttheVH-1sidewallventhood.TheVH-1
may also be used in noncombustible walls.
b) If the 90’ elbow is the termination tting of
choice,then the singlewall pipewill be passing
through the side wall. For combustible walls,
a UL listed thimble shall be used where the
single wall pipe passes through the wall. For
combustible walls using Z-Vent, Saf-T-Vent, or
StaR-34 vent pipe, use the following:
• 3” vent pipe - use Simpson’s Duravent
#905295 3” thimble or equivalent.
• 4” vent pipe - use Simpson’s Duravent
#915295 4” thimble or equivalent Maximum
wall thickness with this thimble is 7 inches.
HORIZONTAL VENTING INSTRUCTIONS
Example: 6 section boiler requires 3 elbows
plus the termination fitting. This means 2
additional 4” elbows will be used, at 6 feet per
elbow. This is equivalent to 12 feet of pipe (2 x
6 =12), therefore maximum vent length is now
18 feet (30 -12 =18).

15
HORIZONTAL VENTING INSTRUCTIONS
ForcombustiblewallsusingProTech FasNSeal
where the single wall vent pipe must pass
through the side wall, a UL Listed FasNSeal
wall thimble shall be used as follows:
• 3” FasNSeal vent pipe - use 3” FasNSeal Wall
Thimble#FSWT034”FasNSealventpipe-use
• 4” FasNSeal Wall Thimble #FSWT04
The thimble is adjustable for different wall
thickness, with a maximum wall thickness of 7
inches.Sealthethimblealongtheoutsideedge
of the plate with caulk or silicone and fasten to
the wall with screws or nails.
c) For single wall pipe through non-combustible
walls, the hole through the wall need only be
large enough to maintain the pitch of the vent
pipe, and provide proper sealing. A thimble
is not required for single wall pipe passing
through noncombustible walls.
d) The venting system shall terminate at least 3
feetabove any forced air inlet located within 10
feet.Theventingsystemshallterminateatleast
4 feet below, 4 feet horizontally from, or 1 foot
above any door, window, or gravity air inlet into
any building. The bottom of the vent shall be
located at least 12 inches above grade.
Figure #10

16
HORIZONTAL VENTING INSTRUCTIONS
Termination of the vent shall be not less than
7feetaboveanadjacentpublicwalkway.The
ventterminalshallnotbeinstalledcloserthan
3 feet from the inside corner of an L shaped
structure. Termination of the vent should be
keptatleast3 feetawayfromvegetation.The
venting system shall terminate at least 4 feet
horizontally from, and in no case above or
below, unless a 4 foot horizontal distance is
maintained,fromelectricmeters,gasmeters,
regulators, and relief equipment.
e) The venting system shall terminate at least 4
feet below any eve, soft, or roof overhang.
f) The venting system shall not terminate
underneath any deck, patio, or similar
structure.
g) Put vent on a wall away from the prevailing
winterwind.Locateorguardtheventtoprevent
accidental contact with people or pets.
h) Terminate the vent above normal snowline.
Avoid locations where snow may drift and
block the vent. Ice or snow may cause the
boiler to shut down if the vent becomes ob-
structed.
i) Under certain conditions, ue gas will con-
dense,formingmoisture.Insuchcases,steps
should be taken to prevent building materials
at the vent terminal from being damaged by
exhaust of ue gas.
8. Joining And Sealing The Vent Pipe:
The vent pipe needs to be both watertight and
gastight. Seal all joints and seams as follows:
A. For Z-Flex Z-Vent Stainless Steel Vent Pipe
useahigh temperaturered siliconesealantrated
for500°F.Theoutsideofthemaleendandinside
ofthefemaleendofthepipemustbecleanedwith
brake cleaner before applying silicone bead.
For 3” vent pipe runs begin with the male end
of the vent pipe over the boilers induced draft
blower outlet. For 4” vent pipe runs begin with
a 6” length of 3” Z-Vent (#02SVEPxx0306) over
the boiler’s induced draft blower outlet, to which
an even bead of high temperature silicone
sealant should be applied. Then connect
the 3” Z-Vent to a Z-Vent 3” to 4” reducer
(#02SVERxx0403). Then continue the 4” Z-Vent
pipe run by connecting the 4” male end of the
Z-Vent to the reducer. (A locking band may be
used around this joint for additional support.)
Thenfollowingthesealinginstructions,pushthe
4” male end of the Z-Vent over the 4” increaser
tting. When using the Tjernlund VH-1 vent
hood, the female end (ared end) of the vent
pipe will be connected to the termination hood.
Themaleendoftheventhoodmustbecrimped
before pushing the Z-Vent over the vent hood’s
connecting pipe.
Before the pipes are joined, apply a ¼” bead of
silicone one inch from the end of the male end.
Then push the pipes together as far as they
will go making sure any seams are aligned and
oriented upward. Now apply another bead of
silicone around this joint and smooth out. Then
use a Z-Flex locking band around the center of
the joint.
Z-Flex Z-Vent Size Locking Band Part #
3” #02SVSLBX03
4” #02SVSLBX04
1. Apply the high temperature silicone
approximately one inch from the end,
around the male end of the pipe in an even
¼” bead.
2. Pipes can now be pushed together as far
as they will go. The seams on pipe should
be aligned and oriented upward in all
horizontal appliances.Apply another bead
of silicone around this joint and smooth
out.3) Slide locking band over center of
joint and tighten gear clamps. Make sure
locking band is centered on joint.
4. Check all joints and seams for gas
tightness.

17
B.For Heat-Fab Saf-T-Vent Stainless Steel Vent
Pipe usea hightemperature redsiliconesealant
rated for 500°FThe outside of the male end and
inside of the female end of the pipe must be
cleaned before applying the silicone bead.
For 3” vent pipe runs, the male end of the vent
pipe which goes over the outlet of the boiler’s
induceddraftblowermustbecrimped.Thevent
pipeshould be crimped asminimal as possible
to provide a tight fit over the outlet. After
crimping is completed follow the instructions
for applying silicone sealant.
For 4” vent pipe runs, begin with a Saf-T-Vent
3” to 4” increaser tting (#7374GC) over the
boiler’s induced draft blower outlet, to which an
evenbeadofhightemperaturesiliconesealant
should be applied. Then continue the 4” Saf-T-
Vent pipe run by connecting the 4” male end of
the Saf-T-Vent to the increaser. (A locking band
may be used around this joint for additional
support.) The vent ow must be in the direction
indicated on the vent pipe.
When using the Tjernlund VH-1 vent hood, the
female end (ared end) of the vent pipe will
be connected to the termination hood. Apply
high temperature silicone in an even ¼” bead
approximately¼” to⅜”fromtheendofthevent
hood’s connecting vent pipe. Also, run a similar
size bead of silicone sealant down the seam
weldoftheventpipe.Thenpushthefemaleend
over the vent hood’s connecting vent pipe.
1. Apply the high temperature silicone around
the male end of the pipe (without the tabs)
in an even ¼” bead. Silicone bead should
be approximately ¼” to ⅜” from the end of
HORIZONTAL VENTING INSTRUCTIONS
5. Horizontal venting shall have a slope not
less than ¼” (6.4mm) every 12 inches
(305mm) downward away from the boiler to
preventcollectionofcondensatethroughout
the assembly.
6.Allowthesealanttocurefor24hoursbefore
operating the appliance.
the male end. Also, run a similar size bead
of silicone sealant down the seam weld at
the end of each joint.
2. Pipes can now be pushed together as far
as they will go. The seams on the vent pipe
should be aligned and oriented upward in
all horizontal appliances. With a moistened
nger or at tool, spread any sealant that
squeezes out around the circumference of
the joint.
3. Attach the sections together with the
locking rings and tabs (except at the blower
outlet where no
locking ring exists.)
Inspect the joint to ensure that ue gases
will not leak. If necessary apply additional
sealant around the joint.
4. Horizontal venting shall have a slope not
less than ¼” (6.4mm) every 12 inches
(305mm) downward away from the boiler to
preventcollectionofcondensatethroughout
the assembly.
5. Allowthesealanttocurefor24hoursbefore
operating the appliance.
C. For Flex-L StaR-34 Stainless Steel Vent Pipe
use a high temperature red silicone sealant
rated for 500°F. Before applying silicone, the
outsideofthemaleendandinsideofthefemale
endofthepipemustbecleanedusingacleaner,
such as methyl ethyl ketone (MEK) or Naptha.
For 3” vent pipe runs, begin with the male end
of the vent pipe over the boiler’s induced draft
blower outlet. For 4” vent pipe runs begin with
a StaR-34 3” to 4” increaser tting (#SR10304)
over the boiler’s induced draft blower outlet. For
both 3” and 4” vent pipe runs, apply a bead of
silicone sealant around the blower outlet and
around the inside of the male end of vent pipe
going over the blower’s outlet.
When using the Tjernlund VH-1 vent hood,
the female end (ared end) of the vent pipe
will be connected to the termination hood.

18
HORIZONTAL VENTING INSTRUCTIONS
D. For ProTech Systems FasNSeal Stainless
Steel Vent Pipe no cleaning uid is required. For
3” vent pipe runs on 2, 3, 4 and 5 section boilers
begin by locating the FasNSeal Ametek Adapter
(part #FSAMETEK) over the boiler’s induced
draft blower. Continue the vent pipe run with 3”
FasNSeal vent pipe.
For 6 and 7 section boilers begin by locating the
FasNSeal Ametek Adapter (part #FSAMETEK)
over the boiler’s induced draft blower. Then connect
a FasNSeal 3” to 4” increaser (part #FS341) to the
3” adapter outlet. Continue the vent pipe run with
4” FasNSeal vent pipe. Other than the Ametek
Adapter and increaser tting, DO NOT use 3”
vent pipe on 6 or 7 section boilers. FasNSeal vent
pipe is joined and sealed by the use of an internal
sealing gasket and a locking band on the female
end of each vent pipe.
All components should be examined for possible
shipping damage prior to installation. Align all vent
pipe seams and orient upward in all horizontal
applications.Adjustableventlengthsareavailablefor
4” diameter vent piping. For 3” diameter vent piping,
square cut male end at the desired length. For 2, 3,
4and 5 sectionboilers using the VH-1-3”vent hood,
connecttheFasNSealVenttotheVH-1-3”venthood
usingFasNSealAdapter#FSC-DUN-3.Thisadapter
has no internal sealing gasket.
Apply high temperature silicone in an even
¼” bead approximately ¼” from the end of the
vent hood’s connecting vent pipe. Also, run a
similar size bead of silicone sealant down the
seam weld of the vent pipe. Then push the
female end over the vent hood’s connecting
vent pipe. Now ll in the channel inlet with
silicone sealant. Do not try to insert the joiner
band, instead fasten the vent pipe to the vent
hood’s pipe with a steel gear clamp.
1. Apply the high temperature silicone around
themaleendofthepipeinaneven¼”bead.
Silicone bead should be approximately ¼”
from the end of the male end. Also, run a
similar size bead of silicone sealant down
the seam weld at the end of each joint.
2. The seams on the vent pipe should
be aligned and oriented upward in all
horizontal vent pipe runs.
3. Insert the male end of one into the female
end of the other. Push the pipe together so
the female end rests up against the stop
bead of the male end.
4. Insert a StaR-Joiner Band into the inlet of the
beaded channel. Feed the Joiner Band in so
it makes its way around the pipe, back to the
channel inlet and it overlaps itself by about ½”.
5. Cut the excess Joiner Band so it lays at in the
beaded channel. Fill the inlet of the beaded
channel with high temperature silicone.
Smoothoutthesiliconeoverthechannelinlet
andthesiliconebetweenthefemale endand
the stop bead of the male end.
6. Horizontal venting shall have a slope not
less than ¼” (6.4mm) every 12 inches
(305mm) downward away from the boiler
to prevent collectionofcondensatethroughout
the assembly.
7.Allow the sealantto cure for 24hoursbefore
operating the appliance.
To attach the adapter to the vent hood, crimp
the 3” vent hood pipe, apply a ¼” bead of high
temperature red silicone sealant around the
outside of the vent hood’s crimped connecting pipe
and a similar bead of high temperature silicone
around the inside of the FasNSeal adapter. After
pressing the two pipes together and tightening the
locking band, nish creating a complete seal by
lling the FasNSeal adapter’s notched hole with
high temperature silicone.
For 6 and7 sectionboilersusingtheVH-1- 4”vent
hood,an adapteris notrequired.The 4”FasNSeal
vent pipe connects directly to the VH-1- 4” vent
hood, and is joined and sealed by the internal
gasket and locking band.

19
HORIZONTAL VENTING INSTRUCTIONS
To Join And Seal The FasNSeal Vent Pipe:
a) Insert male end into female section.
b) Push the units together as far as possible.
c) Firmly tighten locking band with a nut driver.
d) DO NOT penetrate the FasNSeal vent
pipe with fasteners.
e) Horizontal venting shall have a slope of
not less than ¼” (6.4mm) every 12 inches
(305mm) downward away from the boiler
to prevent the collection of condensate
throughout the assembly.
9. Support Spacing:
Do not restrict thermal expansion movement
of the vent. The vent pipe must expand and
contract freely with temperature change.
Each run of vent piping shall be supported as
follows:
a) Z-Flex stainless steel vent piping requires a
loose tting metal strap or similar support at
each joint at a maximum of 4 feet between
supports.
b) Heat-Fab stainless steel vent piping requires
a support for every 6 feet of horizontal piping
run. The support must be secured using at
least #10 fasteners to a solid material (solid
masonry or wood framing or blocking.) Do not
fasten to drywall sheathing using hollow wall
anchors. Each support will be 1½inch lower
than the previous support when spaced 6
feet apart.
c) Flex-L stainless steel vent piping requires a
loose tting metal strap or similar support at
each joint at a maximum of 4 feet between
supports.
d) ProTech stainless steel vent piping requires
one loose tting FasNSeal support strap
(#FSSH) for every 6’ of horizontal vent.
10. If the horizontal vent must go through a crawl
space or other unheated space, the cool
temperatures will likely cause the ue gases
tocontinuouslycondenseinsidethe vent pipe.
Donot insulatethe ventpipe.It mustbe visible
for monthly inspection. Insure that the vent
pipe is properly pitched away from the boiler,
with no low spots, so that condensate in the
ventwilldrainawayfromtheboiler.Aninsulated
enclosure or chase, with access for inspection
and servicing of the vent, may be required to
prevent freezing of liquid condensate. Consult
the vent pipe manufacturer’s instructions for
specic guidelines.
11. At the beginning of each heating season and
monthly during the heating season, check all
vent pipes and the vent terminal to make sure
there are no obstructions. Periodically clean
the screen in the vent terminal.

20
GAS SUPPLY PIPING
CHECK GAS SUPPLY
Thegaspipetoyourboilermustbethecorrectsize
for the length of the run and for the total BTU per
hourinputofallgasutilizationequipmentconnected
toit.See Natural Gas table (following page) for the
proper size. Be sure your gas line complies with
local codes and gas company requirements.
The boiler and its individual shutoff valve must be
Conrm that installing a power venter is an option
allowed by local codes. Follow the specic power
OPTIONAL HORIZONTAL VENTING INSTRUCTION
venter installation instructions issued with the
power venter kits. Although the power venter is
equipped with its own fan, the fan on the boiler
remains in place and is unaltered when a power
venter is used.
When sidewall venting, ue gases must be vented
to a point in relation to the prevailing wind so that
they may freely disperse without being blown
back at the building causing discoloration, or into
the building through doors or windows causing
odors. Also, under certain conditions ue gases
will condense, forming moisture. In such cases,
stepsshouldbetakentopreventbuildingmaterials
at the vent terminal from being damaged by the
exhausted ue gas.
When installing single wall galvanized vent
pipe for power venting follow the specic power
venter installation instructions for layout, location
of the barometric draft control and termination
connections.
Whenjoiningandsealingthesinglewallgalvanized
or Type B vent piping, use RTV silicone sealant
with a minimum temperature rating of 400°F.
For 3” vent pipe runs, begin with the female end
of the vent pipe over the boiler’s induced draft
blower outlet. For 4” vent pipe runs begin with the
galvanized 3” to 4” increaser tting (included in the
boiler’s parts bag) over the induced draft blower
outlet. Then follow by placing the female end of
the 4” vent pipe over the increaser tting.
Whenjoiningpiecesofsinglewallgalvanizedvent
pipe, a substantial bead of silicone shouldbeused
at the joint to insure a leakproof connection.
Horizontal venting with a power venter is an
alternate method of sidewall venting. This boiler
is CSA listed for sidewall venting with standard
single wall galvanized or Type B vent pipe when
using the following power venter kits, which were
specically sized for these boilers:
Number of Field Controls
Boiler Sections Kit Power Venter
2, 3, 4, 5 SWG-4D
6, 7 SWG-5D
Some possible reasons for using a power venter
for sidewall venting:
1. May be preferred by local codes.
2. Need a vent piping run beyond 30’ (but not
more than 50’).
3. The boiler installation site experiences gusting or
high winds. A power venter can help prevent the
boiler from short cycling due to gusting or high
windsbyprovidingventexhaustpressuresgreater
than the boiler’s induced draft blower alone.
4. When installers or homeowners prefer a
negative pressure vent system instead of a
positive pressure vent system.
5. May be more cost effective than stainless steel
venting, particularly at longer vent lengths.
TheFieldControlspowerventkitincludeseither
a SWG-II-4HD or SWG-II-5 power venter, a
MG-1 4” barometric draft controller, and the
CK-43D controls kit.
disconnected from the gas supply piping system
during any pressure testing of that system at test
pressures in excess of ½ psig (3.5 kPa).
The boiler must be isolated from the gas supply
piping system by closing its individual manual
shutoff valve during any pressure testing of the
gas supply piping system at test pressures equal
to or less than ½ psig (3.5 kPa).