ECR International Dunkirk EXCELSIOR 3 Series Instruction manual

High E󱐰ciency
Oil Fired Hot Water Boiler
INSTALLATION, OPERATION &
MAINTENANCE MANUAL
EXCELSIOR Series 3
Models
EXB4075
EXB4090
EXB5100
EXB5120
EXB6130
EXB6145
EXB7165
EXB7180
Manufactured by:
ECR International Inc.
2201 Dwyer Avenue, Utica, NY 13501
Tel. [phone]
www.ecrinternational.com
PN 240013422 REV. A [08/15/2021]

2
Check our website frequently for updates: www.ecrinternational.com
Information and specications outlined in this manual in eect at the
time of printing of this manual. ECR International reserves the right to
discontinue, change specications or system design at any time without
notice and without incurring any obligation, whatsoever.
PN 240013422, Rev. A [08/15/2021]
For Parts lists see manual 240013423 included with your boiler literature package.
*ENERGY STAR LISTED
EXCELSIOR OIL-FIRED CAST IRON HOT WATER BOILEREXCELSIOR OIL-FIRED CAST IRON HOT WATER BOILER
Models
*EXB4075
*EXB5100
*EXB6130
*EXB7165

3
DIMENSIONS
DIMENSIONS
Sections
Flue Size
Inches
(cm)
Dimension
"A"
Inches
(cm)
Dimension
"B"
Inches
(cm)
Chimney
Vent
D i r e c t
Vent
4 5 (13) 18 ⅜(46.6) 1 ⅛ (32) ¾ (19)
5 5 (13) 21 ⅝(54.8) 1 ⅛ (32) ¾ (19)
6 5 (13) 24 ⅞(63.1) 1 ⅛ (32) ¾ (19)
7 6 (15) 28 ⅛(71.3) ¾ (19) N/A
DIMENSIONS
PN 240013422, Rev. A [08/15/2021]

4
TABLE OF CONTENTS
1 - INTRODUCTION .......................................................................................................5
2 - SAFETY INFORMATION..............................................................................................6
3 - BEFORE YOU START..................................................................................................9
4 - RATINGS & CAPACITIES.......................................................................................... 10
5 - LOCATING THE BOILER........................................................................................... 11
6 - INSTALLATION REQUIREMENTS............................................................................... 12
7 - FRESH AIR FOR COMBUSTION................................................................................. 13
8 - BOILER ASSEMBLY ................................................................................................. 15
9 - BOILER SYSTEM PIPING.......................................................................................... 20
10 - HYDRONIC PIPING................................................................................................ 21
11 - FUEL SUPPLY PIPING ............................................................................................ 34
12 - ANTIFREEZE IN THE SYSTEM................................................................................. 35
13 - ELECTRICAL CONNECTIONS .................................................................................. 36
14 - CHIMNEY AND VENTING CONNECTIONS................................................................. 37
15 - FILLING BOILER ................................................................................................... 40
16 - OPERATING THE BOILER - SYSTEM START-UP ........................................................ 41
17 - OIL BURNER, NOZZLE, & AIR SETTINGS................................................................. 48
18 - MAINTENANCE ..................................................................................................... 55
19 - OIL BOILER / BURNER CLEANING INSTRUCTIONS................................................... 57
20 - TROUBLESHOOTING ............................................................................................. 59
21 - EQUIPMENT AND ACCESSORIES ............................................................................ 61
PN 240013422, Rev. A [08/15/2021]

5
1. Oil Fired Boilers
Boiler is low pressure, sectional cast iron constructed
and tested for maximum working pressure of 65 psi in
accordance with A.S.M.E. (American Society of Mechanical
Engineers) Section IV Standards for cast iron heating
boilers. Capacity rated in accordance with AHRI (Hydronics
Institute).
Boiler is pressure red natural draft (chimney vented)
oil red hot water boiler comprised of cast iron sections,
available with 4, 5, 6 or 7 sections. Sections are held
together by metal push nipples and threaded rods.
4, 5 and 6 section boilers may be eld equipped for direct
vent installations with use of direct vent burner and venting
kits. Direct vent instructions are covered in a separate
supplemental instruction document included with direct
vent venting kit.
Boiler models are capable of ring #2 fuel oil from 0.75
gph up to 1.80 gph.
Boilers include -
• Limit, 220° F maximum, operating control with integral
low water cut o
• Temperature and pressure gauge
• 30 psi relief valve
• Drain valve
WARNING
Installations of boilers and venting shall be done
by a qualied expert and in accordance with this
manual. Installing or venting a boiler or any other
oil appliance with improper methods or materials
could result in serious injury or death due to re
or to asphyxiation from poisonous gases such as
carbon monoxide which is odorless and invisible.
!
1 - INTRODUCTION
PN 240013422, Rev. A [08/15/2021]

6
2.2 General
Boiler installation shall be completed by qualied agency.
WARNING
Fire, explosion, asphyxiation and electrical shock
hazard.
Improper installation could result in death or
serious injury. Read this manual and understand all
requirements before beginning installation.
Modication, substitution or elimination of factory
equipped, supplied or specied components could
result in death or serious injury.
Improper installation, adjustment, alteration, service
or maintenance could result in death or serious
injury.
Flooding will result in damages such as electrical
problems, corrosion, inoperative parts, mold and
other unforeseen issues which can occur over time.
Any equipment determined by a professional as
damaged by a ood, dened as excess of water or
other liquid, shall be replaced.
Failure to follow these instructions could result in
death or serious injury.
!
CAUTION
Indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
!!
WARNING
Indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
!
DANGER
Indicates a hazardous situation which, if not avoided,
WILL result in death or serious injury
!
This is the safety alert symbol. Symbol alerts you toThis is the safety alert symbol. Symbol alerts you to
potential personal injury hazards. Obey all safety messagespotential personal injury hazards. Obey all safety messages
following this symbol to avoid possible injury or death.following this symbol to avoid possible injury or death.
2.1 Become Familiar With Symbols Identifying
Potential Hazards.
NOTICE
Used to address practices not related to personal
injury.
2 - SAFETY INFORMATION
FOR YOUR SAFETY READ BEFORE OPERATING
Hot Water Can Scald!
Water heated to temperature for clothes
washing, dish washing and other sanitizing
needs can scald and cause permanent injury.
Children, elderly, and inrm or physically
handicapped persons are more likely to be
permanently injured by hot water. Never leave
them unattended in bathtub or shower. Never
allow small children to use a hot water tap or
draw their own bath.
If anyone using hot water in the building ts the
above description, or if state laws or local codes
require certain water temperatures at hot water
taps, you must take special precautions:
• Use lowest possible temperature setting.
• Install some type of tempering device, such
as an automatic mixing valve, at hot water
tap or water heater. Automatic mixing valve
must be selected and installed according
to manufacturer's recommendations and
instructions.
• Water passing out of drain valves may be
extremely hot. To avoid injury:
• Make sure all connections are tight.
• Direct water ow away from any person.
DANGER
!
PN 240013422, Rev. A [08/15/2021]

7
WARNING
Construction materials of appliance and products
of combustion and fuel contain alumina, silica,
heavy metals, carbon monoxide, nitrogen
oxides, aldehydes and /or other toxic or harmful
substances which can cause death or serious injury
and which are known to the State of California to
cause cancer, birth defects and other reproductive
harm. Always use proper safety clothing,
respirators and equipment when servicing or
working nearby the appliance.
!
WARNING
Combustion chamber insulation in this product
contains ceramic ber material. Ceramic bers can
be converted to cristobalite in very high temperature
applications. The International Agency for Research
on Cancer (IARC) has concluded, Crystalline silica
inhaled in the form of quartz or cristobalite from
occupational sources is carcinogenic to humans
(Group1). Avoid breathing dust and contact
with skin and eyes. Use NIOSH certied dust
respirator (N95). This type of respirator is based
on the OSHA requirements for cristobalite at the
time this document was written. Other types of
respirators may be needed depending on the job
site conditions. Current NIOSH recommendations
can be found on the NIOSH website https://
www.cdc.gov/niosh/topics/silica/. approved
respirators, manufacturers, and phone numbers are
also listed on this website. Wear long-sleeved, loose
tting clothing, gloves, and eye protection. Apply
enough water to the combustion chamber lining to
prevent dust. Wash potentially contaminated clothes
separately from other clothing. Rinse clothes washer
thoroughly.
NIOSH stated First Aid. Eye: Irrigate immediately.
Breathing: Fresh air.
!
Water
Temperature
Seng
1st Degree Burn
Exposure Time For
An Adult
2nd and 3rd Degree Burn
Exposure Time For An
Adult
120° F 1 minute 5 minutes
130° F 5 seconds 30 seconds
140° F 2 seconds 5 seconds
150° F 1 second 1.5 seconds
160° F Instantaneous 0.5 seconds
Note: Warning for Infants, Children, and Elderly:
Great care must be taken when exposing the
aforementioned groups to warm or hot water as they
can be badly burned in exposure times less than half
of the time for an adult.
2 - SAFETY INFORMATION
WARNING
This prod uct contains Fibrous glass. Fibrous
glass is a synthetic ber made from tiny particles
of glass. Fibrous glass has been classied as a
possible human carcinogen. When disturbed as a
result of servicing or repair, brous glass becomes
airborne and, if inhaled, may be hazardous to
your health. It can harm the eyes, skin, and the
lungs. Airborne bers from these materials have
been listed by the State of California as a possible
cause of cancer through inhalation. Adhere
to the following precautions and procedures.
Avoid breathing dust and contact with skin and
eyes. Use NIOSH certied dust respirator (e.g.,
N95). Other types of respirators may be needed
depending on the job site conditions. Current NIOSH
recommendations can be found on the NIOSH
website https://www.cdc.gov/niosh/. Approved
respirators, manufacturers, and phone numbers
are also listed on this website. Wear appropriate
personal protective clothing to prevent skin contact,
as well as gloves and eye protection. Wash skin
daily at end of each work shift, and prior to eating,
drinking, smoking, etc. Workers whose clothing
may have been contaminated should change into
uncontaminated clothing before leaving the work
premises. Wash potentially contaminated clothes
separately from other clothing. Rinse clothes washer
thoroughly. Follow all Local, State and Federal
guidelines for disposal.
NIOSH stated First Aid. Eye: Irrigate immediately.
Breathing: Fresh air.
!
PN 240013422, Rev. A [08/15/2021]

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IMPORTANT: Read the following instructions
COMPLETELY before installing!!
2.3 Installation Shall Conform To Requirements
Of Authority Having Jurisdiction Or In Absence
Of Such Requirements To ANSI/NFPA 31,
“Installation Of Oil Burning Equipment”. In
Canada, Current Edition Of Canadian Standards
Association CSA B139, Installation Code For
Oil Burning Equipment” For Recommended
Installation Practices. Such Applicable
Requirements Take Precedence Over General
Instructions Of This Manual.
2.4 Current Edition of American National Standard
ANSI/NFPA 211 “Chimneys, Fireplaces, Vents and
Solid Fuel Burning Appliances” for venting.
2.5 Where required by authority having
jurisdiction, installation shall conform to Standard
for Controls and Safety Devices for Automatically
Fired Boilers, ANSI/ASME CSD-1.
Additional manual reset low water cuto and manual reset
high limit may be required.
2.6 Requirements for Commonwealth of
Massachusetts:
Boiler installation must conform to Commonwealth of
Massachusetts code 248 CMR which includes but is not
limited to:
• Installation by licensed plumber or gas tter.
NOTICE
Surface rust on cast iron sections may be attributed
to manufacturing process as well as condensation
during storage. Surface rust is normal and does not
aect performance or life of boiler.
CAUTION
Laceration, burn hazard. Metal edges and parts may
have sharp edges and/or may be hot. Use appropriate
personal protection equipment to include safety
glasses and gloves when installing or servicing this
boiler. Failure to follow these instructions could result
in minor or moderate injury.
!!
2 - SAFETY INFORMATION
PN 240013422, Rev. A [08/15/2021]

9
3.1 Installation and Operation
1. Do not operate unit if any control, switch, components
or devices have been underwater or subject to water
damage.
2. Before servicing, allow boiler to cool. Always shut o any
electricity and oil supply to boiler when working on it.
3. Inspect oil line and connections for leaks.
4. Verify oil burner nozzle is proper size. Over-ring could
result in early failure of boiler sections, and result in a
potentially dangerous situation.
5. Never vent boiler into enclosed space. Always vent to
the outside. Never vent to another room or inside a
building.
6. Verify adequate air supply for complete combustion.
7. Relief valve automatically lifts open when system
pressure exceeds 30 psi. Before installing relief valve
read manufacturer’s instructions. Pipe relief valve to a
safe location. Check with authorities having jurisdiction.
8. Consider system total water volume, temperature,
initial ll pressure and arrangement when sizing and
installing expansion tank. Improperly installed and
sized expansion tank may result in frequent lifting of
relief valve or other heating system problems. Follow
expansion tank manufacturer guidelines for installation,
and sizing.
9. Boiler manufacturer recommends initial ll pressure of
10-12 psi. For higher ll pressures increase expansion
tank’s air charge to match ll pressure.
10. Purging heating system of air and gases is critical for
proper circulation and quiet performance. Once the air
is purged, for boiler installations using oat type vents,
air vents should be closed for normal operation. If air
is heard or noticed by loss of heat, purge system and
open vents for short period of time.
3.2 Prior To Installing The Boiler
• Verify you have selected right size boiler with proper
capacity. AHRI rating of boiler selected should be greater
than or equal to calculated peak heating load (heat loss)
for building or area(s) served by boiler and associated
hot water heating systems. Use heat loss calculations
based on approved methods. See Table 1.
• Boiler must be supplied with proper oil supply and oil
piping, sucient fresh combustion air, and suitable
electrical supply.
• Connect boiler to suitable venting and piping systems
adequate to distribute heating load.
• Installation is not complete unless pressure relief valve
is installed in 3/4” tapping located in supply piping.
• Thermostat must be properly located and installed
• Failure to pipe boiler correctly may result in excessive
noise or other related problems.
Existing Water System Evaluation
A good system will prevent oxygen contamination of boiler
water.
1. Causes of oxygen contamination may be:
A. Addition of excessive make up water as a result of
leaks.
B. Absorption through open tanks and ttings.
C. Oxygen permeable materials in the distribution
system.
2. To insure long product life, oxygen sources must be
eliminated.
Take the following measures:
A. Repair system leaks.
B. Eliminate open tanks from the system.
C. Eliminate and/or repair ttings which allow oxygen
absorption.
D. Use non-permeable materials in the heating system.
3 - BEFORE YOU START
PN 240013422, Rev. A [08/15/2021]

10
GPH = U.S. Gallons per Hour
Mbh = 1000 Btu (British thermal units) per hour.
psi = Pounds per square inch
*MAWP = Maximum allowable working pressure. This low pressure oil red hot water boiler is constructed and
hydrostatically tested for maximum working pressure of 65 psi in accordance with the latest revision of the A.S.M.E.
(American Society of Mechanical Engineers) Boiler and Pressure Vessel Code Section IV Standards for heating boilers.
AFUE= Annual Fuel Utilization Eciency
Heating Capacity and AFUE based on 13.1% CO2 (13.5% CO2 at 0.90 GPH, 13.2% CO2 at 1.65 GPH), -0.02” w.c. draft in
breech, and # 1 smoke or less. Testing is done in accordance with U.S. DOE (Department of Energy) test procedure.
Heating Capacity indicates amount of heat available after subtracting losses up the stack. Remaining heat is available
to heat water. Small portion is heat from jacket and surfaces of boiler and this heat stays in structure. Net AHRI rating
represents portion of remaining heat applied to heat radiation or terminal units (i.e. nned tube baseboard, cast iron
radiators, radiant oor, etc.). Dierence between Heating Capacity and Net AHRI Rating, called piping and pickup
allowance, establishes reserve for heating volume of water in system and osetting heat losses from system piping. Net
AHRI ratings shown are based on piping and pickup factor of 15% in accordance with AHRI Standard as published by
Hydronics Institute.
Net AHRI rating of boiler selected should be greater than or equal to calculated peak heating load (heat loss) for building
or area(s) served by boiler and associated hot water heating systems. Consult manufacturer before selecting boiler for
installations having unusual piping and pickup requirements.
Table 1 - RATINGS & CAPACITIES
OIL-FIRED HOT WATER BOILERS
Models
Number
of
Sections
Firing
Rate
[GPH]
Input
[Mbh]
Heating
Capacity
[Mbh]
Net
AHRI
Rating
[Mbh]
*MAWP
Water
[psi]
AFUE
[%]
M i n .
Relief
Valve
Capacity
[Mbh]
M a x .
Water
Temp
[°F]
Chimney
Liner
Size
Round
[Inches]
Chimney
Liner
Size
Square
[Inches]
Flue
Size
[Inches]
EXB4075 4 0.75 105 92 80 65 87.0 140 250 6 6¾ 5
EXB4090 4 0.90 126 110 96 65 86.0 140 250 6 6¾ 5
EXB5100 5 1.00 140 123 107 65 87.0 175 250 6 6¾ 5
EXB5120 5 1.20 168 148 129 65 86.0 175 250 6 6¾ 5
EXB6130 6 1.30 182 160 139 65 87.0 210 250 6 6¾ 5
EXB6145 6 1.45 203 178 155 65 86.0 210 250 6 6¾ 5
EXB7165 7 1.65 231 202 176 65 87.0 245 250 7 6¾ 6
EXB7180 7 1.80 252 220 191 65 86.0 245 250 7 6¾ 6
4 - RATINGS & CAPACITIES
PN 240013422, Rev. A [08/15/2021]

11
1. Boiler is suitable for installation on combustible
ooring. Do not install boiler on carpeting.
2. Locate boiler in front of nal position before removing
crate.
3. Locate unit so vent pipe connection to chimney will be
short and direct.
4. For basement installation, provide solid elevated base,
such as concrete, if oor is not level, or if water may be
encountered on oor around boiler.
5. Provide recommended service clearance, if applicable,
as follows:
• Clearance from Jacket Front Panel
24” for servicing burner
• Clearance from Jacket Side Panels
24” for burner swing door, if opened fully with burner
mounted, otherwise 2” with burner removed.
• Clearance From Jacket Rear Panel
24” minimum for rear smoke box cleaning. (Note:
this dimension will also be controlled by horizontal to
vertical to horizontal smoke pipe arrangement. See
Figure 1 .
6. Minimum clearances to combustible material see
Figure 1 and Table 2.
Table 2 - BOILER CLEARANCES
Unit Combustible
Clearance
Accessibility,
Cleaning,
and Servicing
Top 12” (32 cm) 24” (61 cm)
Right Side 2” (5 cm) 24” (61 cm)
Left Side 2” (5 cm) 24” (61 cm)
Floor Combustible No Requirement
Front 17” (43 cm) 24” (61 cm)
Back 9” (23 cm) 24” (61 cm)
Flue 9” (23 cm) 9” (23 cm)
All distances measured from the boiler jacket or ue.
7. Fresh air forr combustion and ventilation must be
available at boiler. Ventilating and combustion air must
enter boiler room without restrictions.
8. Installation shall conform to requirements of authority
having jurisdiction or in absence of such requirements
in United States, follow NFPA 31 Installation of Oil
Burning Equipment.
9. Clearance to venting is for single wall ue pipe. If Type
L vent is used, clearance may be reduced to minimum
required by vent pipe manufacturer.
15”
15”
2
Figure 1 - Clearances to Combustible Construction
WARNING
Fire hazard. Do not install on carpeting. Failure to
follow these instructions could result in death or
serious injury.
!
5 - LOCATING THE BOILER
PN 240013422, Rev. A [08/15/2021]

12
NOTICE
Shut o manual fuel supply valve if burner is shut
down for extended period of time.
Figure 2 - General Requirements For A Typical Installation
RELIEF
VALVE
CHECK LOCAL CODES FOR
MAXIMUM DISTANCE FROM
FLOOR, OR OTHER ALLOWABLE
SAFE POINT OF DISCHARGE.
6 - INSTALLATION REQUIREMENTS
PN 240013422, Rev. A [08/15/2021]

13
1. Determine volume of space (boiler room). Rooms
communicating directly with the space in which
appliances are installed, through openings not furnished
with doors, are considered a part of the space.
Volume (ft3) = Length (ft.) x Width (ft.) x Height (ft.)
2. Determine total input of all appliances in the space.
Add inputs of all appliances in the space and round the
result to the nearest 1000 BTU/hr.
3. Determine type of space. Divide Volume by total input
of all appliances in space. If the result is greater than
or equal to 50 ft3/1000 BTU/hr, then it is considered
an unconned space. If the result is less than 50
ft3/1000 BTU/hr, then the space is considered a
conned space.
4. When a boiler is located in an unconned space of a
conventionally constructed building, fresh air inltration
through cracks around windows and doors normally
provides adequate air for combustion and ventilation.
5. Provide outdoor air for boiler located in a conned
space or an unconned space in a building of unusually
tight construction. Outdoor air may be provided with
the use of two permanent openings which communicate
directly or by duct with the outdoors or spaces
(ventilated crawl or attic) freely communicating with
the outdoors. Locate one opening within 12 inches
of top of space. Locate remaining opening within 12
inches of bottom of space. Size each opening per the
following:
A. Direct communication with outdoors:
Minimum free area of 1 square inch per 4,000 BTU
per hour input of all equipment in space.
B. Vertical Ducts: Minimum free area of 1 square
inch per 4,000 BTU per hour input of all equipment
in space. Duct cross-sectional area shall be same
as opening free area.
C. Horizontal Ducts: Minimum free area of 1 square
inch per 2,000 BTU per hour input of all equipment
in space. Duct cross-sectional area shall be same
as opening free area.
Alternate method for boiler located within
conned space: Use indoor air if two permanent
openings communicate directly with additional space(s)
of sucient volume such that the combined volume of
all spaces meet criteria for unconned space. Size each
opening for minimum free area of 1 square inch per
1,000 BTU per hour input of all equipment in spaces,
but not less than 100 square inches.
6. Louvers and Grilles of Ventilation Ducts
A. All outside openings should be screened and
louvered. Screens used should not be smaller than
1/4 inch mesh. Louvers will prevent the entrance of
rain and snow.
B. Free area requirements need to consider the
blocking eect of louvers, grilles or screens
protecting the openings. If the free area of the
louver or grille is not known, assume wood louvers
have 20-25% free area and metal louvers and grilles
have 60-75% free area.
C. Louvers and grilles must be xed in the open
position, or interlocked with the equipment to open
automatically during equipment operation.
Figure 3 - Air Openings For Boiler Located In
Conned Space (Utility Room)
WARNING
Asphyxiation, re hazard. Do not obstruct air
openings to combustion area. Follow instructions
below, to maintain adequate combustion air.
!
NOTICE
Install outside air intake if used with a replace or
kitchen or bathroom exhaust fan. These devices rob
boiler and water heater of combustion air.
7 - FRESH AIR FOR COMBUSTION
PN 240013422, Rev. A [08/15/2021]

14
Fresh Air Duct Capacities For Ducts Supplying Fresh Air To Boiler In Tightly Constructed Houses
Table 3 - FRESH AIR DUCT CAPACITIES
THROUGH LOUVERS
Fresh Air
Duct Size
¼” Mesh
Screen
Wood
Louvers
Metal
Louvers
(Btuh)* (Btuh)* (Btuh)*
3 ½” x 12” 144,000 36,000 108,000
8” x 8” 256,000 64,000 192,000
8” x 12” 384,000 96,000 288,000
8” x 16” 512,000 128,000 384,000
*Btuh = British Thermal Units per hour based
on opening covered by ¼” mesh screen , wood
louvers, or metal louvers.
Figure 4 - Fresh Air Openings
7 - FRESH AIR FOR COMBUSTION
PN 240013422, Rev. A [08/15/2021]

15
1. Remove Crate
A. Remove all fasteners at crate skid.
B. Lift outside container and remove all other inside
protective spacers and bracing. Remove burner and
miscellaneous parts boxes.
2. Remove Boiler from skid . Boiler is secured to base
with 4 screws. Remove all securing hardware.
3. Move boiler into permanent position by sliding or
walking into place.
4. Do not drop boiler. Do not bump boiler jacket
against oor.
5. Open burner swing door .
A. Loosen and remove non-hinged side latching
hardware.
B. Remove hinged side latching hardware.
C. Door can be swung to full open position
approximately 90 to 120 degrees with the burner
mounted providing there is 22” of clearance to the
adjacent wall.
NOTICE
Burner door may come o hinges if lifted when
opened.
If reduced clearance prevents door from opening fully, one
of the following can provide full access:
• Burner can be removed to allow full rotation of door.
Door with burner mounted can be lifted o hinges and
set aside during servicing.
• Door mounting hardware is reversible from left side
hinge (as shipped) to right side hinge. To reverse hinge
arrangement. See Figure 5.
• Lift door o mounting eye bolts and set aside. Remove
mounting eye bolts from left side. Move door mounting
eye bolts to right side. Tighten both sets of hardware.
Lift door and place integral cast hinge pins on door into
slotted mounting bracket holes.
Recommend hinges be on same side as exible oil line in
order to swing door open.
6. Inspect Swing door insulation and rope gasket.
A. Inspect ber rope located on swing door. Evenly
distribute rope around perimeter of door groove
do not bunch or overhang. There must not be
a gap where two ends of rope meet. Repair or
replace if rope is damaged or if there is gap
between ends.
B. Inspect burner swing door insulation for damage.
C. Combustion chamber and raised portion between
2nd and 3rd pass ue ways make an impression
in door insulation as designed.
D. Do not close and secure door at this time.
Figure 5 - Reversible Hinge
EYEBOLT & NUT
AS HINGE
5/8 BOLT
(BOLT INTO FRONT SECTION)
EYEBOLT & NUT
AS HINGE
NOTICE
For purpose of these instructions, all pipe
connections shall use pipe dope or Teon tape to
assure water tight connections unless otherwise
instructed. Steps 6 thru 16, and Figure 10, Page 17.
7. Open accessory carton and remove contents. Identify
components using illustrations throughout this section
applicable to your installation.
8. Locate 1-1/4" x 6" pipe nipple . Thread thru insulation
slot into supply port in rear of boiler. Locate 1-1/4
x 3/4 x 1-1/4 tee and assemble onto nipple. Verify
connections are tight with outlet facing directly up. See
Figure 6 .
9. Locate 1-1/4” x 10" nipple. assemble onto tee. See
Figure 6
8 - BOILER ASSEMBLY
1-1/4" X 6” NIPPLE
1-1/4 x 3/4 x 1-1/4 TEE RELIEF VALVE
Figure 6 - Supply Piping
1-1/4" X 10” NIPPLE
PN 240013422, Rev. A [08/15/2021]

16
8 - BOILER ASSEMBLY
NOTICE
Do not install valve between boiler and controls
manifold or relief valve.
14. Check installation of liners and baes (Not all
models) . See Table 4.
A. Check oval (4 section) or V-shaped (6 and 7 section)
liner. See Figures 11 and 12 . Liner should be ush
with front edge of heat exchanger ns.
B. Flue way baes (4, 5, 6 section only) are factory
installed in 3rd pass. 4 section boiler uses twelve
Type A baes, six left hand and six right hand.
5 and 6 section boiler use a Type B bae. Insure
baes are inserted in ue way so the position tab
touches casting between 2nd and 3rd Pass ue way.
See Figures 13a, and 13b.
Eciency of boiler is based on insertion of ue way baes
in 4, 5 and 6 section units. Baes will generate lower
gross stack temperatures entering chimney. This has the
potential under certain operating conditions to cool ue
gases below dew point, creating condensation on interior
chimney and chimney connector surfaces. Remove baes
to increase stack temperature if there are any signs of
condensation in chimney or chimney connector. Removing
baes alone may not address condensation depending on
other boiler and heating system operating conditions.
10. Locate cast 1-1/4 x 1-1/4 x 3/4 tee and assemble on
1-1/4" x 10" nipple with 3/4” tapping facing toward
front of boiler and joint is water tight.
11. Install Limit control mounting plug in upper 3/4”NPT
port facing front. See Figure 7.
12. Install Limit control & harness assembly. Loosen
mounting screw on bottom of limit control.
A. Mount control on mounting plug and tighten screw
to secure control. See Figure 7.
B. Conrm thermal limit/LWCO sensor bulb is fully
inserted to bottom of control well in top of rear
boiler section and secured with grommet. See
Figure 8.
C. Route thermal limit/LWCO sensor wire to control
and connect. See Figure 10, and Figure 15.
WARNING
Burn and scald hazard. Relief valve could
discharge steam or hot water during operation.
Check local codes for maximum distance from oor
or allowable safe point of discharge. Installation of
relief valve shall be consistent with ANSI/ASME Boiler
and Pressure Vessel Code, Section IV.
!
13. Install Relief Valve. See Figures 6 and 9 .
A. DO NOT pipe in area where freezing can occur. DO
NOT install shuto valves, plugs or caps.
B. Locate 3/4”NPT x 90° street elbow. Install elbow
using 3/4” NPT tapping in supply piping. Install
elbow with outlet facing directly up. Install relief
valve with outlet facing horizontally.
C. Pipe discharge of relief valve. Installation of relief
valve must be consistent with ANSI/ASME Boiler and
Pressure Vessel Code, Section IV
MOUNTING
PLUG
Figure 7 - Control On Mounting Plug w/Screw
SENSOR IN WELL
WITH GROMMET
Figure 8 - Grommet
Figure 9 - Relief Valve
NOTICE
Flue gas condensate is corrosive, which requires
special consideration and must be addressed
immediately.
PN 240013422, Rev. A [08/15/2021]

17
8 - BOILER ASSEMBLY
Figure 10 - Supply Piping and Control Assembly
LIMIT CONTROL
WITH INTEGRAL
LOW WATER
CUT OFF
THERMAL/ LWCO
WIRE
BURNER WIRING
RELIEF VALVE
BACK OF BOILER
NOTICE
Do not install valve between boiler and controls
manifold or relief valve.
PN 240013422, Rev. A [08/15/2021]

18
8 - BOILER ASSEMBLY
Figure 11 - Oval Liner
Figure 12 - V-Shaped Liner
Table 4 - BAFFLES & LINERS
Model Liner Liner
Length
Bae
Type
Bae
Length
Bae
Quantity
4 Oval 4” A 9” 6 Left/6 Righ t
5 NONE NA A 12” 6 Left/6 Righ t
6 V SHAPE 12” A 15” 6 Left/6 Righ t
7 V SHAPE 14” A 18" 6 Left/6 Righ t
15. Connect Field Wiring. See “13 - Electrical
Connections”.
A. Route wire harness from burner to Limit control
through rear jacket panel. See Figure 10. Connect
molex plug on burner wire harness to its receptacle
on limit control.
B. If optional manual reset high temperature limit is
not used, ensure supplied jumper is installed.
C. Connect the wiring harness from limit control to
circulator. See Figure 14.
D. 120 volt power supply eld wiring connects to limit
control. Provide appropriate overcurrent protection
and service disconnect switch.
E. Wire power supply. Connect green wire to grounding
lug. When installing wiring through hole in Limit,
use anti-abrasion cable clamp. Connect black “hot”
wire to L1 of terminal block, white “N” wire to L2 of
terminal block.
16. Install top panel. Place on top of side panels. Position
tabs in top panel into slots in side panels. Push top
panel toward back of boiler. Install rear panel screws.
17. Install drain valve . Install drain valve with hose
connection facing right or left. This allows clearance
for swing door to open and close with drain and
hose attached. Verify connection is water tight. See
Figure 16.
18. Close burner swing door .
A. Use one hand to hold door in position by applying
pressure directly to door while re-installing securing
hardware with your opposite hand. Always install
non-hinged side latching hardware rst, then install
hinged side hardware. Apply additional pressure
while hand tightening hardware as far as possible,
then release pressure.
Figure 13 Type A Third Pass Baes (4 Section)
Figure 13 b - Bae Types A
TYPE A
LEFT HAND
TYPE A
RIGHT-
HAND
PN 240013422, Rev. A [08/15/2021]

19
Figure 14 - Circulator Wiring
NOTICE
Ensure all conduit is secured to prevent contact with
ue pipe
DRAIN
VALVE
NOTICE
When securing burner swing door, make sure door is
drawn-in equally on both sides.
Failure to follow the prescribed procedure could
cause thread damage to casting or a leak in the
door seal. If hinged side is tightened before the
unhinged side, the hinged side of door cannot
be drawn to provide an air-tight seal. Applying
excessive torque will only cause thread damage.
B. Use hand wrench to tighten door hardware and start
with non-hinged side. Use alternating tightening
method from non-hinged side to hinged side to
tighten door equally until sealed without applying
excessive torque. Never tighten hinged side ange
bolt rst or tighten either piece of hardware 100%
without using alternating tightening method described
above.
19. Install oil burner
• Check oil nozzle in burner for size, angle and type,
inspect electrode settings, check head setting, check air
band and air shutter settings. See “Oil Burner, Nozzle,
& Air Settings”.
• DO NOT install burner without gasket. Place oil burner
gasket on face of burner swing door with 4 burner
ange bolts installed part way.
• Align round part of key hole slots of burner ange with
burner door bolts. Turn burner to lock in place.
• Tighten all 4 hex nuts using diagonal sequence.
• Plug burner power cord into burner harness.
• Attach exible oil hose included in parts box.
BLACK
TO
YELLOW
WHITE
TO
WHITE
GREEN TO
GROUND
SCREW
Figure 15 - Limit Control Wiring
Figure 16 - Drain Valve
THERMAL/
LWCO WIRE
PIN
BLACK
WIRE TO
L1 WHITE
WIRE TO
B2
RED
WIRE
TO B1
C1, C2
CIRCULATOR
WIRING
8 - BOILER ASSEMBLY
PN 240013422, Rev. A [08/15/2021]

20
9.1 Connect System Supply And Return Piping
To Boiler
Connect system supply and return piping to correct boiler
ttings.
Size system circulator to supply sucient ow (GPM) to
allow 20°F temperature dierential in system. Connect
circulator harness to circulator per Figure 14 and furnished
wiring diagram.
When sizing system circulator, use single most restrictive
zone to determine maximum pressure drop.
1. Boiler used in connection with refrigeration systems,
install boiler so chilled medium is piped in parallel with
heating boiler using appropriate valves to prevent
chilled medium from entering boiler. See Figure 28 .
2. If boiler is connected to heating coils located in air
handling units exposed to refrigerated air, equip boiler
piping with ow control valves to prevent gravity
circulation of boiler water during operation of cooling
system.
3. Limit control includes low water cuto function, sensing
water level at control well in top of the rear boiler
section. Periodic inspection and testing is necessary
per instructions provided with limit control.
4. When installation of boiler is for new heating system,
install all radiation units (panels, radiators, baseboard,
or tubing) and supply and return mains. After heating
system piping and components have been installed,
make nal connection of system piping to boiler.
Recommend mount circulating pump on supply side
piping, such that it pumps away from expansion tank.
5. Hot water boiler installed above radiation level must
be equipped with low water cut o device. This boiler
is factory equipped with low water cuto. Periodic
inspection is necessary, per manufacturer’s specic
instructions.
6. When connecting cold water supply to pressure
reducing valve, make sure clean water supply is
available. When water supply is from well or pump,
install sand strainer at pump.
9.2 Bypass Piping
See Piping Diagrams for illustrations for this section.
Bypass piping may be required for applications listed
below. Failure to do so may cause damage due to thermal
shock and sustained condensation within the boiler.
Protect boiler from sustained operation of return water
temperatures lower than 130°F (54C). Occasionally,
temperatures as low as 70°F (21C) may return back to
boiler when a zone that has not been activated for some
time is opened. However, most residential systems with
nned-tube (aluminum-copper) baseboard radiation
contain low volume of water and will not adversely aect
boiler. Systems with nned-tube baseboard radiation
typically do not require bypass.
Bypass piping details shown in piping diagrams must be
used for any one of following conditions:
• All large water content systems, including cast iron
standing radiators, cast iron baseboard, converted
two-pipe steam systems, converted gravity circulation
systems and other similar systems.
• Any system, including nned-tube baseboard, with
priority domestic hot water zone.
Install ¾ inch bypass line as shown in piping diagrams for
systems identied above.
Bypass valve cannot protect boiler from sustained
condensing operation for low temperature applications such
as radiant oor heating. These types of system require
active controls that prevent return of cold return water to
boiler.
Refer to Radiant Professional’s Alliance (RPA)
www.radiantprofessionalsalliance.org for piping
recommendations for non-condensing boiler applications.
9 - BOILER SYSTEM PIPING
PN 240013422, Rev. A [08/15/2021]