ECR International SBO Series Instruction manual

SBO
Steam Boilers
Series
Oil
Installation,
Operation &
Maintenance
Manual
TO THE INSTALLER:
This manual is the property of the owner and must
be affixed near the boiler for future reference.
TO THE OWNER:
This boiler should be inspected annually by a
Qualified Service Agency.
Name:
Address:
Phone:
Service Information
ECR International Inc.
2201 Dwyer Avenue, Utica, NY 13501
Tel. [phone]
www.ecrinternational.com
PN 240013301 REV. A [11/30/2020]

ii
USING THIS MANUAL 1
A. INSTALLATION CLEARANCE ............1
B. SPECIAL ATTENTION BOXES............1
1. PREINSTALLATION 2
A. CLEARANCES ........................2
B. AIR FOR COMBUSTION &
VENTILATION.........................2
C. CHIMNEY / VENT & DRAFT CONTROL.....3
D. PLANNING THE LAYOUT ...............3
E. BOILER WATER TREATMENT............3
2. BOILER PLACEMENT & ASSEMBLY 4
A. SETTING THE BOILER ..................4
B. FLUE OUTLET ........................4
3. PIPING & CONTROLS 5
A. PRESSURE TEST BLOCK ASSEMBLY .....5
B. BOILER RETURN CLEARANCE ...........5
C. STEAM BOILER PIPING .................6
D. TANKLESS HEATER OR COVERPLATE ....7
E. CONTROLS...........................7
4. ELECTRICAL 8
A. GENERAL ............................8
B. WIRING ..............................8
5. BURNER SETUP & BOILER
OPERATION 10
A. BURNER INSTALLATION...............10
B. BURNER START-UP & ADJUSTMENT ....10
C. CHECK BOILER CONTROLS ............10
D. FILL THE BOILER .................... .10
E. CLEAN THE BOILER...................10
6. MAINTENANCE 12
A. GENERAL ...........................13
B. DAILY MAINTENANCE (WITH BOILER
OPERATING) ........................13
C. MAINTENANCE OF SAFETY
RELIEF VALVE .......................13
D. MONTHLY MAINTENANCE (WITH BOILER
OPERATING) ........................13
E. MAINTENANCE – ANNUAL.............13
F. IF A LONG SHUTDOWN IS REQUIRED ...14
7. BOILER DIMENSIONS & RATINGS 15
8. REPAIR PARTS 16
TABLE OF CONTENTS
TABLE OF CONTENTS

A. INSTALLATION CLEARANCE
Follow the installation instructions provided in this
manual in the order shown. The order of these
instructions has been set in order to provide the installer
with a logical sequence of steps that will minimize
potential interferences and maximize safety during boiler
installation.
B. SPECIAL ATTENTION BOXES
Throughout this manual you will see special attention
boxes intended to supplement the instructions and make
special notice of potential hazards. These categories
mean, in the judgment of manufacturer.
USING THIS MANUAL
1
USING THIS MANUAL
Indicates a hazardous situation, which, if not avoided,
will result in death or serious injury and major
property damage.
⚠ DANGER
Indicates a hazardous situation, which, if not avoided,
could result in death or serious injury and major
property damage.
⚠ WARNING
Indicates special attention is needed,
not related to personal injury or property damage.
NOTICE
⚠ CAUTION
Indicates a hazardous situation, which, if not avoided,
could result in minor or moderate injury, and minor
property damage.

2
A. CLEARANCES
Unit may be installed on combustible flooring, provided the
boiler is not set on carpet and a metal drip pan is placed
under the appliance.
Unit may be installed in a closet with the above clearances.
See also Section B, Air for Combustion and Ventilation.
B. AIR FOR COMBUSTION &
VENTILATION
1. Be certain adequate facilities are available to provide
air for satisfactory combustion and ventilation.
2. Appliances Located in Unconfined Spaces (a space
whose volume is equal to or greater than 50 cubic
feet per 1,000 Btu/hr of the aggregate input rating of
all fuel-burning appliances installed in that space).
a. For installation in unconfined spaces with
conventional construction and larger areas such
as basements, the supply of air for combustion
and ventilation can usually be considered
adequate.
3. Appliances Located in Confined Spaces (a space
whose volume is less than 50 cubic feet per 1,000
Btu/hr of the aggregate input rating of all fuel-
burning appliances installed in that space).
a. All air from inside the building: Provide two
permanent openings communicating directly with
an additional room. If all air for combustion and
ventilation is to come from within the building:
two openings, one near the ceiling and one near
the floor of the boiler room shall be provided
with the minimum free area of each opening
equal to 140 sq. in. per gallon of oil burned.
b. If all air for combustion and ventilation is to
come from outside the building: two openings,
one near the ceiling and one near the floor of the
boiler room shall be provided with the minimum
free area of each opening equal to 35 sq. in. per
gallon of oil burned.
c. If ducts are used to convey the air, areas of
35 sq. in. per gallon of oil burned for vertical
ducts or 70 sq. in. per gallon of oil burned for
horizontal ducts are to be provided. Ducts shall
have the same area as the free area of the
openings to which they are connected.
PREINSTALLATION
1. PREINSTALLATION
Read carefully, study these instructions before beginning work. It will save time. Study the included drawings. Save these
instructions for reference.
The boiler warranty can be voided if the boiler is not installed, maintained and serviced correctly.
Table 1.1: Clearances from Jacket and Vent System
Required from Jacket
to Combustible
Construction
Recommended From Jacket for
Accessibility and Mounting Controls
Top 5”* 24” to clean flueways.
Front 16.5”* 16.5” from jacket due to burner.
Left 2”* 12” due to burner swing radius.
Right 2”*
18” on steam with tankless heater
9” in area of boiler service switch and
junction box.
Rear 2”* 9” for mounting relief valve in standard
location**.
Vent Pipe (Single Wall) - 9” to Combustible Construction.
Clearance may be reduced using methods in NFPA 31.
Vent Pipe (Double Wall) - See Manufacturer’s Instructions.
* Consider also vent pipe clearance, including distance from edge of
flue outlet to combustible construction (as applicable).
** See dimensional drawing for alternate relief valve location.
This manual is intended for use by Qualified Heating Professionals only. Installation, service, or adjustment
of this heating appliance by anyone other than a Qualified Heating Professional can cause significant property
damage, personal injury, or death.
WARNING
The equipment shall be installed in accordance with those installation regulations in force in the local area
where the installation is to be made, including the current edition of NFPA-31, Standard for the Installation of
Oil-Burning Equipment. These shall be carefully followed in all cases. Authorities having jurisdiction shall be
consulted before installations are made.
NOTICE
Never burn garbage or paper in the unit, and never
leave combustible material around it.
CAUTION
Do not tamper with boiler controls.
CAUTION

3
C. CHIMNEY / VENT & DRAFT CONTROL
1. Draft Requirement - Minimum draft required in the
vent system is -.03” W.C. to -.06” W.C. depending
on boiler model, see Table 7.1 (Section 7). This draft
is necessary to provide the required draft over fire of
-.01” W.C. to -.02” W.C..
2. A barometric draft control is required for regulation
of over fire draft. Follow manufacturer’s instructions
to locate and adjust the control.
3. The vent system and installation must be in
accordance with the current edition of ANSI/
NFPA 211, “Standard for Chimneys, Fireplaces,
Vents, and Solid Fuel Burning Appliances”;
NFPA-31, “Standard for the Installation of Oil-
Burning Equipment” and in Canada, CSA B 139,
“Installation Code for Oil-Burning Equipment” or
applicable provisions of local building codes. Typical
minimum chimney size is 8” x 8” x 15 feet high,
unless otherwise allowed by code. If the vent system
is not sized correctly, the burner may not operate
properly. This can cause poor combustion, sooting,
and odors to occur.
4. NFPA 31 recommends using a listed metal chimney
liner to reduce transient low draft during startup and
flue gas condensation during cyclic operation. Any
doubt on the condition of a chimney or its ability to
prevent the generation and accumulation of flue gas
condensate, must be lined according to NFPA 31.
5. Inspect the existing chimney, chimney liner, and vent
connector. Make sure each are in good condition
and repair or replace as required.
6. Chimney flue gas condensation is affected by a
number of factors such as chimney design, flue
connector length, sulfur content in fuel oil, and flue
gas temperature. If your application experiences flue
gas condensation, installation of a listed corrosion
resistant metal liner is required.
• External chimneys are more susceptible to flue
gas condensation due to exposure to outside air
temperatures. To prevent corrosion due to flue
gas condensation, use a listed corrosion resistant
metal liner.
• When firing the appliance where fuel oil sulfur
content exceeds 300ppm, a listed corrosion
resistant chimney liner is recommended.
D. PLANNING THE LAYOUT
Prepare sketches and notes of the layout of the
installation. Include boiler location, venting system,
existing piping and wiring. Show existing equipment that
may interfere with installation of new equipment.
E. BOILER WATER TREATMENT
Consult a local qualified water treatment specialist for
recommendations regarding the appropriate chemical
compounds and concentrations which are compatible
with local environmental regulations.
1. Boiler water pH should be in the 7.5 to 11 range.
2. Boiler water chloride concentration should
be less than 30 ppm.
3. The water hardness should be less than 7 grains per
gallon to prevent scale build-up and foaming.
PREINSTALLATION
This boiler shall be connected to a venting system
having sufficient draft. Follow draft requirements
listed in Section C below.
Improper venting may result in property damage
and the release of flue gases which contain deadly
carbon monoxide into the home, which can cause
severe personal injury, death, or substantial property
damage.
WARNING
A masonry chimney must have a clay flue liner.
If flue gas condensation is occurring, install a listed
corrosion resistant metal liner.
Failure to install a clay flue liner may cause severe
injury or death.
WARNING
Series SBO is approved at the listed firing rates
only. Failure to fire the boiler at its designed input
may cause excessive flue gas condensation. In
addition, lower input may not create enough draft to
adequately evacuate the products of combustion.
WARNING

4
A. SETTING THE BOILER
1. Provide a level foundation, located as close as
possible to the center of the heating system.
2. Refer to Figure 2.1 for exploded view of boiler while
checking and/or assembling parts of the boiler.
3. Open burner mounting plate (item 5) at this time
to make certain the target wall (item 2) is seated in
the back of the combustion chamber. Ceramic fiber
blanket base liner (item 3: SBO-4 only) should be
lying flat on bottom of combustion chamber between
target wall and burner mounting plate. Close burner
mounting plate.
4. See clearance information in Section 1,
“Preinstallation.”
B. FLUE OUTLET
Boilers are shipped set up for rear flue outlet and may
be converted to top flue outlet by removing the large
knockout in the jacket top panel and switching the flue
collar (item 14) with the flue cover plate (item 13). Both
items use same gasket seal (item 12). Continue to use
machine screws in back section and sheet metal screws
in (top) flue collector. Locate jacket coverplate in the
accessory carton and attach to jacket rear panel using
sheet metal screws provided.
2. BOILER PLACEMENT & ASSEMBLY
BOILER PLACEMENT & ASSEMBLY
5
6
3
2
4
17
16
9
1
10
11
12
13
12
14
15
18
Figure 2.1: Boiler Exploded View (See Table 8.1 for parts identification)

PIPING & CONTROLS
5
A. PRESSURE TEST BLOCK ASSEMBLY
1. Temporarily provide a cold water supply connection
to the boiler.
2. Install pressure gauge in tapping provided. See
Boiler Dimensional drawing, Figure 7.1 (Section 7)
3. Plug all open tappings in the boiler and fill with
water. Apply approximately thirty (30) psig pressure.
Check to make certain that all joints and fittings are
water tight.
4. After all joints and connections have been proven
tight, remove cold water supply and plugs from all
tappings that are to be used.
See Figure 7.1 (Section 7) for tapping locations.
B. BOILER RETURN CLEARANCE
If using front return, piping must allow for opening and
closing Burner Mounting Plate.
C. STEAM BOILER PIPING
1. Refer to Hydronics Institute Residential Hydronic
Heating Installation/Design Guide for assistance.
2. See Figure 3.1. The return loop from system should
always enter equalizer through the Hartford Loop,
2” to 4” below normal water line (see dimensional
drawing for normal water line).
3. See Table 3.1 and Figure 3.1 for pipe size
information.
4. Pipe the steam header a minimum of 24” above the
normal water line using swing joints to attach the
risers into the steam header.
3. PIPING AND CONTROLS
Table 3.1: Steam Pipe Sizing
Boiler Model
No. Supply Riser Header Equalizer
SBO-3 (1) 2” 2” or 3” 1-1/4”
SBO-4 (1) 2” 2” or 3” 1-1/4”
Do not pipe boiler before jacket is installed.
NOTICE

6
PIPING & CONTROLS
Figure 3.1: Steam; Near Boiler Piping - SBO-3 & SBO-4
CONDENSATE RETURN
STEAM
SUPPLY
1
1
2
3
4
5
6
7
8
7
4
9
10 11
12
8
99
11
10
10
13
14
15
16
16
NORMAL
WATER LINE
BOTTOM OF HEADER
FLOOR LINE
MINIMUM
24"
26 1/2"
N.W.L.
TOP OF ELBOW
2" TO 4" BELOW NORMAL WATER LEVEL

7
PIPING & CONTROLS
D. TANKLESS HEATER OR COVERPLATE
1. If a tankless coil is used (item 9), install in opening in
rear section.
2. For suggested piping of tankless water heater refer to
Figure 3.2.
3. Install control well for low limit operating control into
3/4 NPT control tapping on tankless heater plate.
Install low limit operating control on control well.
Wire low limit control to oil burner per Figure 4.2.
4. If not using a tankless coil, cover the heater opening
with cover plate (item 16). Packaged boiler is factory
equipped with a cover plate installed.
E. CONTROLS
1. Steam Boiler Controls:
a. Install the gauge glass trim and safety relief valve.
See Figure 7.1 (Section 7).
b. For installations requiring a second operating
control that senses steam pressure (not provided),
use a Honeywell PA404A or equivalent. On
probe boilers, install the additional pressure
control opposite the
standard PA404A using a cross instead of a
tee along with a second brass siphon (not
provided).
c. Boiler is factory equipped with Hydrolevel
CG450 low water cut off. See Figure 7.1 (Section
7) for location. See also control manufacturers
instruction sheet.
2. For complete information on servicing and
adjustment of controls, refer to the attached control
specification sheets.
12" MIN.
3/4"
CONTROL
TAPPING
TANKLESS
HEATER
HIGH TEMPERATURE
HOT WATER
WATER
MIXER
COLD WATER INLET
FLOW CONTROL
MIXED
WATER
Figure 3.2: Tankless Coil Piping, Steam Boiler
Install anti-scald device in hot water supply piping.
Water temperature above 125°F can cause severe
burns instantly or death from scalds.
DANGER
Be sure rubber gasket is in place between cover
plate or water heater plate and boiler section.
NOTICE
Pipe the discharge of the safety
valve or relief valve to prevent injury in the event of
pressure relief. Pipe the discharge to a drain. Provide
piping that is the same size as the relief valve.
CAUTION
Figure 3.3: Discharge Piping from
Safety Relief Valve
SAFETY RELIEF VALVE
DISCHARGE
LINE
CHECK LOCAL
CODES FOR
MAXIMUM
DISTANCE
FROM FLOOR
OR ALLOWABLE
SAFE POINT OF
DISCHARGE
BOILER

8
ELECTRICAL
A. GENERAL
All electrical wiring shall be done in accordance with
the National Electrical Code and Local Requirements.
Single pole switches including those of safety controls or
protective devices shall not be wired in a grounded line.
B. WIRING
1. See Section 5 for mounting burner.
2. Burner harness is pre-wired to burner by burner
manufacturer. After the burner is mounted, Molex
plug on burner harness plugs into mating Molex
receptacle in junction box. See Figure 4.1.
3. For complete information on servicing and
adjustment of controls, refer to the attached control
specification sheets.
4. See Wiring Diagram Figure 4.2 for Steam Boilers
with Probe LWCO
4. ELECTRICAL
Improper installation of burner harness can allow
burner to energize with burner mounting plate open,
creating a severe burn hazard to boiler maintenance
personnel.
WARNING
Figure 4.1: Junction Box Wiring, Steam Boilers

ELECTRICAL
9
Figure 4.2: Steam with Probe Low Water Cut-off

10
BURNER SETUP & BOILER OPERATION
A. BURNER INSTALLATION
1. The oil burner is supplied with a mounting flange
fixed in position.
2. Mount the burner to the burner mounting plate
(item 5) with four (4) 5/16” studs and nuts provided.
3. Care must be taken when routing the oil lines so
not to interfere with the opening and closing of the
burner mounting plate. Flexible oil lines or flared
copper disconnects with valves (when copper lines
are used) may be installed to assure full opening of
the burner mounting plate when servicing.
4. Oil burner specifications:
For information pertinent to the oil burner such
as nozzle sizing, fuel supply piping, adjusting or
servicing, refer to the charts in this section and the
burner installation manual.
B. BURNER START-UP & ADJUSTMENT
1. Burner should start automatically when thermostat
is turned up and main boiler service switch is turned
on. If burner does not start, check to be sure there is
oil in the tank and push square red reset button on
Beckett burner control.
If burner still does not start, contact serviceman.
2. Adjust burner and barometric draft control for
highest CO²(Maximum 13.1%) while maintaining a
0 Smoke and a minimum -.01” W.C. draft overfire.
All adjustments must be made using suitable
instruments such as found in a Bacharach
Combustion Test Kit.
3. Burner and boiler can be shut down by turning
down the thermostat and moving the main boiler
service switch to the “off” position.
4. See burner manufacturer’s manual for further
information regarding the burner.
C. CHECK BOILER CONTROLS
1. Limit and Operating Controls:
a. Lower the set point of each control until the
burner shuts down. Note that the system pressure
(or temperature) corresponds to the desired set
point.
b. Return the controls to the desired set point.
2. Low Water Cut-off - consult the manufacturer’s
instructions for the low water cut-off operational
check procedure.
D. FILL THE BOILER
1. The normal water line for steam boilers with gravity
returns is shown in Figure 7.1.
2. For systems with pumped returns or boiler feed
units, the fill level will depend on the control being
used. Verify the unit maintains a water level that is
visible in the gauge glass and does not exceed the
normal water level.
3. Check all joints and fittings in the system piping for
leaks and repair as necessary
4. See Section 1 - Preinstallation for boiler water
treatment requirements.
E. CLEAN THE BOILER
1. Clean the boiler within one week after initial start-
up. Cleaning will be more effective if boiler operates
a day or two to loosen sediment and impurities in
system.
2. Boiler must be cleaned to remove any accumulation
of oil, grease, sludge, etc. in the system. These
substances can cause foaming and surging of boiler
water, producing an unstable water line and water
carryover to system.
3. Connect a skim valve off the 1-1/4 NPT skim tapping
on front of boiler. See Figure 7.1 (Section 7) to
locate skim tapping. Run a drain line off skim valve
to a point of safe discharge.
5. BURNER SETUP & BOILER OPERATION
Be sure hi temp gasket is between the burner
mounting flange and the Burner Mounting Plate.
NOTICE
Burn only #2 Fuel Oil in this appliance. Do not use
gasoline, crankcase drainings or any oil containing
gasoline.
CAUTION
Do not start the burner unless all cleanout doors
are in place.
CAUTION
Do not attempt to start the burner when excess oil
has accumulated, when the unit is full of vapor, or
when the combustion chamber is very hot.
CAUTION
Cleaning the boiler requires the use of very hot water
and corrosive chemicals. Use care when handling to
prevent injury.
WARNING

11
BURNER SETUP & BOILER OPERATION
4. Provide a means of supplying continuous fresh water
to the boiler for the cleaning process.
5. Use common washing soda, such as Arm and
Hammer Super Washing Soda. Mix 1/2 pound of
soda with water in a 10 quart pail. Pour the mixture
into the boiler through the safety relief valve tapping.
6. Open the skim valve. Fill boiler until water begins to
flow out of the valve.
7. Turn on burner. Allow boiler water to heat up to just
below steaming (180 - 200°F). Do not allow boiler
to steam; steaming mixes up contaminants instead of
floating them at surface.
8. Open make-up water valve to continually feed water
to boiler. Adjust flow to maintain water temperature
at 180 - 200° F.
9. Continue skimming boiler until water flowing from
skim tapping flows clear. This will take some time,
possibly several hours for a dirty system.
10. Turn off burner, close make-up water valve.
11. Drain boiler completely. Refill and drain one or two
times to wash out all washing soda.
12. Remove skim valve and piping. Install 1-1/4”NPT plug
in skim tapping.
If gauge glass becomes dirty more contaminants
have worked loose in system. Repeat cleaning and
skimming process as needed to clean system.
NOTICE
Do not allow make-up water to flow too fast.
Excessive quantities of cold water may fracture
sections.
CAUTION
Do not leave boiler unattended while firing burner.
Operating boiler with water below minimum
permissible water level may fracture sections.
CAUTION
BECKETT BURNER SPECIFICATIONS
Boiler
Model No.
Burner
Model No.
Burner
Head
Static
Plate Nozzle Size Pump Pressure
Start-up Settings Head
Setting
Air Shutter Air Band
SBO-3085 AFG-F31F3 3-3/8” 0.75 80° B HAGO2140 PSI 6.0 1 N/A
SBO-3105 AFG-F4 F4 3-3/8” 0.90 80° B HAGO 140 PSI 6.0 0 N/A
SBO-4125 AFG-F4 F4 3-3/8” 1.10 80° B HAGO2140 PSI 5.0 2 N/A
SBO-4150 AFG-F6 F6 2-3/4” 1.25 80° B HAGO 140 PSI 8.0 1 N/A
Factory Equipped Burner Cartons are indicated in Boldface.
1 Requires Low Firing Rate Baffle.
2 Parts required to convert factory equipped burner to operate at alternate lower firing rate are provided in rerate kits, sold separately.
Table 5.1: Beckett Burner Specifications

12
MAINTENANCE
6. MAINTENANCE
Product Safety Information
Refractory Ceramic Fiber Product
This appliance contains materials made from refractory ceramic fibers (RCF). Airborne RCF,
when inhaled, have been classified by the International Agency for Research on Cancer
(IARC), as a possible carcinogen to humans. After the RCF materials have been exposed
to temperatures above 1800°F, they can change into crystalline silica, which has been
classified by the IARC as carcinogenic to humans. If particles become airborne during
service or repair, inhalation of these particles may be hazardous to your health.
Avoid Breathing Fiber Particulates and Dust
Suppliers of RCF recommend the following precautions be taken when handling these
materials:
Precautionary Measures:
Provide adequate ventilation.
Wear a NIOSH/MSHA approved respirator.
Wear long sleeved, loose fitting clothing and gloves to prevent skin contact.
Wear eye goggles.
Minimize airborne dust prior to handling and removal by water misting the material and
avoiding unnecessary disturbance of materials.
Wash work clothes separately from others. Rinse washer thoroughly after use.
Discard RCF materials by sealing in an airtight plastic bag.
First Aid Procedures:
Inhalation: If breathing difficulty or irritation occurs, move to a location with fresh clean air.
Seek immediate medical attention if symptoms persist.
Skin Contact: Wash affected area gently with a mild soap and warm water. Seek immediate
medical attention if irritation persists.
Eye Contact: Flush eyes with water for 15 minutes while holding eyelids apart. Do not rub
eyes. Seek immediate medical attention if irritation persists.
Ingestion: Drink 1 to 2 glasses of water. Do not induce vomiting. Seek immediate medical
attention.
WARNING

13
MAINTENANCE
A. GENERAL
1. Check pipes adjacent to cold walls or in unheated
spaces. Insulate and tape them if necessary to be
sure they can’t freeze up.
2. If there is considerable foreign matter in the boiler
water, the boiler should be shut down and allowed
to cool, then drained and thoroughly flushed out.
Drain the boiler at the drain cock. Pipe the drain
cock to a suitable drain. Skim and blow down the
boiler to remove remaining matter. See Section
1 - PreInstallation for water quality requirements If
there is evidence that hard scale has formed on the
internal surfaces, the boiler should be cleaned by
chemical means as prescribed by a qualified water
treatment specialist.
3. There must be no signs of continuous wetness
at the chimney. If signs of continuous wetness
are observed, a qualified service agency must be
consulted to modify the vent configuration to prevent
the formation of condensate, which may damage the
vent pipe.
B. DAILY MAINTENANCE (WITH BOILER
OPERATING)
Daily boiler observation can be performed by the owner.
If any potential problems are found, a qualified installer
or service technician/agency must be notified.
1. Remove any combustible materials, gasoline and
other flammable liquids and substances that generate
flammable vapors from the area where the boiler
is contained. Make certain that the boiler area has
ample air for combustion and ventilation and that
there are no obstructions to the free flow of air to
and from the boiler.
2. Observe general boiler conditions (unusual noises,
vibrations, etc.)
3. Observe operating pressure gauge on the boiler.
Boiler pressure should never be higher than 5 psi
below the rating shown on the safety relief valve.
The valve rating can be found on the top of the
safety relief valve.
4. Check for water leaks in boiler and system piping.
C. MAINTENANCE OF SAFETY RELIEF
VALVE
1. Check function and maintain safety relief valve as
specified by manufacturer, typically every other
month or every month, per the instructions on the
tag on the safety relief valve.
D. MONTHLY MAINTENANCE (WITH BOILER
OPERATING)
1. Check boiler room floor drains for proper
functioning.
2. Test probe type low-water cut-off by using the Push-
to-Test Button.
3. Observe operation of boiler through one complete
cycle to make sure boiler is controlled as intended.
4. Follow additional instructions in the Burner Manual
for proving the burner component operation.
E. MAINTENANCE – ANNUAL
TO CLEAN:
1. Remove top jacket panel, flue collector cover plate,
Item 11 (Figure 2.1), and flue baffles.
2. To thoroughly clean the boiler it must be brushed
down from the top. Alternatively, for limited space
or minimum clearance to combustible installations,
cleaning the heat exchanger from the combustion
chamber side is acceptable. If unit is extremely dirty, it
may be necessary to brush from both directions. The
target wall is made of a soft ceramic fiber. Care must
be taken not to damage this material during cleaning.
3. Remove any scale or soot from the combustion
chamber area by vacuum cleaning or any other
available means.
Entire heating system, including boiler, burner and
venting system, must be inspected at least once a
year by a qualified heating professional. Boiler is to
be cleaned at least once a year.
NOTICE
Disconnect all power to the burner before accessing
combustion chamber.
WARNING
Do not use this appliance if any part has been under
water. Improper or dangerous operation may result.
Immediately call a qualified service technician to
inspect the boiler and to replace any part of the
control system and any control which has been
under water.
WARNING
Burner mounting plate must be opened to facilitate
this operation.
NOTICE

14
MAINTENANCE
4. Replace oil burner nozzle and filter(s).
5. Re-install flue baffles. When replacing the flue
collector cover plate, be certain that the blanket
seal between the flue collector cover plate and top
section makes a tight seal to prevent leakage of the
products of combustion.
6. Replace jacket top panel.
7. Inspect venting system.
F. IF A LONG SHUTDOWN IS REQUIRED
1. To take boiler out of service if the boiler and system
are not to be used when temperatures are below
freezing:
a. Drain the boiler and system completely and shut
off make-up water supply.
b. Open main line power disconnect switch to
boiler. Remove the fuses or secure the switch so
that the power cannot be turned on accidentally.
2. Be certain that the boiler and system are refilled
before returning to service.
All cover plates, enclosures, and guards must be
maintained in place at all times, except during
maintenance and servicing.
NOTICE
Always keep the manual fuel supply valve shut off
if the burner is shut down for an extended period of
time.
CAUTION

15
BOILER DIMENSIONS & RATINGS
7. BOILER DIMENSIONS & RATINGS
Figure 7.1: Boiler Dimensions
Boiler
Model
Number
Jacket
Depth
“A”
Jacket
Width
“B”
Jacket
Height
“C”
Rear of Jacket
to c/l of Vent
“D”
SBO-3085/3105 15-3/4” 22-1/8” 35” 8-7/8”
SBO-4125/4150 19-3/4” 22-1/8” 35” 10-7/8”
Table 7.1: Boiler Ratings
Series SBO
Water
Content,
gal
Minimum
Stack
Draft
Required,
in. W.C.
Boiler
Model
Number
Input
Heating
Capacity3,
MBH
Net Ratings2AFUE,
%
GPH¹ MBH Steam Steam
Sq. Ft.
Steam,
MBH Steam
SBO-3085 0.85 119 104 325 78 85.6 12.00 -0.04
SBO-3105 1.05 147 127 396 95 85.0 12.00 -0.05
SBO-4125 1.25 175 152 475 114 85.6 14.87 -0.04
SBO-4150 1.50 210 180 563 135 85.0 14.87 -0.05
SERIES SBO BOILER RATINGS
1 Burner input based on No. 2 fuel oil with a heating value of 140,000 Btu per gallon.
2 Net steam ratings based on an allowance of 1.333. Additional allowance required when selecting a boiler for installations having unusual piping and pickup
requirements, such as intermittent system operation, extensive piping systems, etc.
3 Heating Capacity and Annual Fuel Utilization Efficiency (AFUE) ratings are based on U.S. Government tests.
Chimney Size: 8” x 8” x 15 ft.

16
REPAIR PARTS
8. REPAIR PARTS
Table 8.1
Part numbers may be subject to change without notice.
*See Figure 2.1 on page 4 for boiler exploded view.
Item
No.* Description Additional Information
Stock
Code
1Block Assembly – SBO-3 (Includes 2, 4, 5, 16. 17) –SB90707
Block Assembly – SBO-4 (Includes 2, 3, 4, 5, 16, 17) –SB90708
2Target Wall –SB50795
3Combustion Chamber Blanket Liner SBO-4 –420001185
4Swing Door Hinge –SB3903
5Burner Mounting Plate Assembly (Includes Mounting Plate Insulation and 6) –SB90101
–Burner Mounting Plate Insulation –SB50794
6Burner Mounting Plate Rope Seal 4.4 Feet SB51211
9Tankless Coil Kit with Gasket (17) and Bolts –SB90507
–Tankless Coil Kit with Low Limit Control (L4006A1058) and wiring,
Gasket (17) and Bolts –550004158
10 Flue Collector Plate Rope Seal SBO-3 3.8 ft.
SBO-4 4.4 ft. SB51211
11 Flue Collector Plate – SBO-3 –SB90565
–Flue Collector Plate – SBO-4 –SB90566
12 Flue Gasket Seal –SBPP5011
13 Top/Rear Flue Outlet Cover Plate –SB90563
14 Flue Collar – SB90386
15 Jacket Assembly – SBO-3 –SB91165
Jacket Assembly – SBO-4 –SB91166
16 Steel Cover Plate (Rear) –SB51775
17 Rubber Gasket (Rear Section Plate) –SB51673
18 Flue Baffle 1 per Flueway SB51613
–Pressuretrol (PA404A1009) –SS-001.01
–Drain Valve –240009323
–Pop Safety Valve –1570001
–Steam Pressure Gauge –14623006
–Water Level Gauge Glass (22-209-10 with 7-1/4” Glass) –SB50513
–Syphon –14643004
–Probe Type Low Water Cut-Off (CG450P1560) –SB29041
–Low Limit Operating Control with Control Well (L4006A1058) –SB50535
–Low Limit Wire Harness –SB7540
–Beckett AFG Burner for SBO-3105 –550004153
–Beckett AFG Burner for SBO-4150 –550004154
–Rerate Kit for SBO-3085 –550004155
–Rerate Kit for SBO-4125 –550004156

17
NOTES

SBO
Steam Boilers
Series
Oil
Installation,
Operation &
Maintenance
Manual
ECR International Inc.
2201 Dwyer Avenue, Utica, NY
13501 Tel. [phone]
www.ecrinternational.com
PN 240013301 REV. A [11/30/2020]