Page 1
Oil-Fired Steam Boilers
Boiler Manual
• Installation
• Startup
• Maintenance
• Parts
This manual must only be used by a qualified heating installer/service technician. BEFORE
installing, read all instructions in this manual and all other information shipped with the
boiler. Perform steps in the order given. Failure to comply could result in severe personal
injury, death or substantial property damage.
Part number 550-141-829/1211
Page 2
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
Using this manual
Homeowner —
Read and follow all information on pages 1 through 8 ONLY.
Service technician —
Read and follow ALL information in the entire manual.
Failure to follow all instructions in proper order can cause severe personal injury, death or
substantial property damage.
When calling or writing about the boiler
Please have boiler model number and series from boiler rating label and CP number(s) from boiler jacket,
burner and controls. On page 33 of this manual is space to list CP number(s).
Packaged and non-packaged boilers
Packaged boilers, available only in sizes 2 through 6, are factory assembled, complete with block, jacket and
controls. Burner is shipped separately.
Non-packaged boilers, available in all sizes, 2 through 9, are shipped with block assembled, with jacket.
Controls, trim and burner shipped separately for field assembly.
Hazard definitions
The following defined terms are used throughout this manual to bring attention to the presence of hazards
of various risk levels or to important information concerning the life of the product.
Indicates presence of hazards that will cause severe personal injury,
death or substantial property damage.
Indicates presence of hazards that can cause severe personal injury,
death or substantial property damage.
Indicates presence of hazards that will or can cause minor personal
injury or property damage.
Indicates special instructions on installation, operation or
maintenance that are important but not related to personal injury
or property damage.
2
Part number 550-141-829/1211
Page 3
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
Contents
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
Using this manual . . . . . . . . . . . . . . . . . . . . .2
When calling or writing about the boiler . . . . . . . .2
Packaged and non-packaged boilers. . . . . . . . . .2
Hazard denitions . . . . . . . . . . . . . . . . . . . . .2
Contents . . . . . . . . . . . . . . . . . . . . . . . . . .3
Please read before proceeding . . . . . . . . . . . . . .4
Routine maintenance schedule. . . . . . . . . . . . . .5
Beginning each heating season . . . . . . . . . . . .5
Daily during heating season . . . . . . . . . . . . . .5
Weekly during heating season . . . . . . . . . . . . .5
Periodically during heating season. . . . . . . . . . .5
End of heating season . . . . . . . . . . . . . . . . .5
Boiler shutdown . . . . . . . . . . . . . . . . . . . .5
Operation. . . . . . . . . . . . . . . . . . . . . . . . . .6
SGO with float-type low water cutoff . . . . . . . . . .6
SGO with probe-type low water cutoff . . . . . . . . .7
Troubleshooting . . . . . . . . . . . . . . . . . . . . . .8
Before installing boiler . . . . . . . . . . . . . . . . . .9
Installations must comply with . . . . . . . . . . . . .9
Before selecting boiler location. . . . . . . . . . . . .9
Provide clearances around boiler (see Figure 3). . . .9
Provide air for combustion and ventilation . . . . . .10
Lay a foundation, if needed . . . . . . . . . . . . . 10
Install boiler — packaged boilers only. . . . . . . . . 11
Place boiler. . . . . . . . . . . . . . . . . . . . . . 11
Perform hydrostatic pressure test . . . . . . . . . . 11
Install boiler — non-packaged boilers only . . . . . . 12
Place boiler. . . . . . . . . . . . . . . . . . . . . . 12
Tankless heater, if used . . . . . . . . . . . . . . . 12
Perform hydrostatic pressure test . . . . . . . . . . 14
Install jacket (sizes 7 through 9 only). . . . . . . . . 14
Install boiler controls . . . . . . . . . . . . . . . . .14
Install burner — all boilers . . . . . . . . . . . . . . . 16
Install burner (also refer to instructions
packed with burner) . . . . . . . . . . . . . . . . . 16
General chimney requirements. . . . . . . . . . . . 16
Connect breeching . . . . . . . . . . . . . . . . . . . 17
Connect breeching . . . . . . . . . . . . . . . . . . 17
Connect steam piping. . . . . . . . . . . . . . . . . . 18
General piping information . . . . . . . . . . . . . .18
Install piping . . . . . . . . . . . . . . . . . . . . . 18
To connect SGO boilers to indirect-fired
water heaters. . . . . . . . . . . . . . . . . . . . . 18
Optional reservoir piping . . . . . . . . . . . . . . .21
Connect tankless heater piping . . . . . . . . . . . . 22
To pipe tankless heater. . . . . . . . . . . . . . . . 22
Connect tankless heater piping . . . . . . . . . . . . 23
Connect wiring — general information . . . . . . . . 24
General wiring requirements . . . . . . . . . . . . . 24
Thermostat wiring . . . . . . . . . . . . . . . . . . 24
Junction box (furnished) . . . . . . . . . . . . . . . 24
Burner wiring . . . . . . . . . . . . . . . . . . . . . 24
High temperature limit . . . . . . . . . . . . . . . . 24
Blocked vent shutoff switch . . . . . . . . . . . . . 25
Connect wiring (Float-type LWCO) . . . . . . . . . . . 26
Blocked vent safety switch (BVSS), when required . 27
Connect wiring (Probe-type LWCO) . . . . . . . . . . 28
Blocked vent safety switch (BVSS), when required . 29
Connect oil piping . . . . . . . . . . . . . . . . . . . . 30
General oil piping requirements . . . . . . . . . . . 30
Oil piping connection at burner. . . . . . . . . . . . 30
Start up. . . . . . . . . . . . . . . . . . . . . . . . . . 31
Fill the system . . . . . . . . . . . . . . . . . . . . 31
Tips for steam systems. . . . . . . . . . . . . . . . 31
Skim steam boiler . . . . . . . . . . . . . . . . . . 31
To place in operation . . . . . . . . . . . . . . . . .31
Check out procedure . . . . . . . . . . . . . . . . . . 32
Check off steps as completed . . . . . . . . . . . . 32
Installation and service certicate . . . . . . . . . . . 33
Installation and service certificate . . . . . . . . . .33
Annual service check list . . . . . . . . . . . . . . . . 34
Detailed service procedures . . . . . . . . . . . . . . 35
Cleaning boiler flueways . . . . . . . . . . . . . . .35
General description of control operation . . . . . . .36
Burner adjustments for packaged and
non-packaged boilers . . . . . . . . . . . . . . . . 36
Controls requiring annual service . . . . . . . . . . 36
Handling ceramic ber and berglass materials . . . 37
Parts list . . . . . . . . . . . . . . . . . . . . . . . . . 38
Parts drawing . . . . . . . . . . . . . . . . . . . . . . 39
Replacement parts . . . . . . . . . . . . . . . . . . . 40
Dimensions . . . . . . . . . . . . . . . . . . . . . . . 44
Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Part number 550-141-829/1211
3
Page 4
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
Please read before proceeding
Homeowner —
• For homeowner or person responsible for
simple start-up and routine maintenance of
the system
• Instructions on 1 through page 8 must be
followed to assure proper operation of your
boiler. See page 8 for lists common problems
and possible corrections. In addition, it is your
responsibility to:
• Have boiler and burner installed by a quali-
fied installer.
• Have boiler and burner serviced annually
by a qualified service technician.
• Review and understand start-up and rou-
tine maintenance procedures with qualified service technician.
• Perform routine maintenance as described
on page 5.
Service technician —
• For a qualified service technician who has the
necessary equipment to check the boiler and
system performance, and is responsible for
start-up and service of boiler and system.
• All instructions in this manual must be followed to assure proper operation of this
boiler.
• Annually service boiler and burner to assure
proper operation. See page 34 for service
record.
• Review and explain start-up and routine maintenance procedures with homeowner.
Follow instructions below to prevent severe personal
injury, death or substantial property damage:
• To avoid electric shock, disconnect electrical supply to burner
service switch and additional external switches before performing service.
• To avoid severe burns, allow boiler to cool before performing
service.
• Do not block flow of combustion or ventilation air to boiler.
• Boiler must be connected to a flue with sufficient draft at all times
to assure proper operation.
• Do not use this boiler if any part has been under water. Electrical
and mechanical failures may cause electric shock and fire risks.
Immediately call a qualified service technician to inspect chimney
or vent, boiler and burner. Have the boiler flueways cleaned and
have the following replaced:
• all electrical and mechanical controls
• electrical wiring
• oil burner and controls
• insulation and chamber lining
Tips for water systems —
• Check boiler and system piping for leaks. Continual makeup water
will reduce boiler life. Minerals can build up in sections, reducing heat transfer and causing cast iron to overheat, resulting in
section failure.
Failure to maintain recommended pH and repair leaks
can cause section iron corrosion, leading to section
failure and leaks. Do not use petroleum-based sealing
or stop-leak compounds in boiler systems. Damage to
system components can result, causing property damage.
• Boiler water pH 7.0 to 8.5 is recommended. For pH conditions
outside 7.0 to 8.5 range or unusually hard water areas (above 7
grains hardness), consult local water treatment company.
• When using antifreeze:
Use antifreeze especially made for hydronic systems. Inhibited
propylene glycol is recommended.
Do not use automotive, ethylene glycol, undiluted or
petroleum-based antifreeze. Severe personal injury, death
or substantial property damage can result.
50% solution provides protection to about –30°F.
Local codes may require back-flow preventer or actual discon-
nect from city water supply.
Determine quantity according to system water content. Boiler
water content is listed on back cover of Boiler Manual.
Percent of solution will affect sizing of heat distribution units,
circulator and expansion tank.
Follow antifreeze manufacturer’s instructions.
Do not add cold water to hot boiler. Thermal shock can cause
sections to crack.
4
Part number 550-141-829/1211
Page 5
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
Routine maintenance schedule
Beginning
each heating season
Daily
during heating season
Weekly
during heating season
Call a qualified service technician to perform annual service.
Check that boiler area is free from combustible materials, gasoline
and other flammable vapors and liquids.
Check for and remove any obstructions to flow of combustion or
ventilation air to boiler.
Check that breeching is attached between boiler and chimney. If
breeching is loose or damaged, immediately turn off switch on
boiler and call service technician to repair.
Check for oil leaks in oil piping and around burner. If found, im-
mediately call qualified service technician to correct situation.
Check for water leaks in boiler and piping; also check for leaks
around tankless heater plate, if installed. If found, immediately call
service technician to repair.
Check float-type low water cutoff, when used: Refer to control
manufacturer’s instructions.
Scald potential. Do not blow down low water cutoff unless blow-
down piping has been installed according to Boiler Manual. If
piping is not in place, call qualified service technician to install.
Periodically
during heating season
End
of heating season
Boiler
shutdown
Test probe-type low water cutoff, when used: refer to control
manufacturer’s instructions.
If tankless heater is installed, boiler will continue to operate. Check
for the following:
• All daily and weekly instructions listed on this page must be followed.
• Burner motor may have to be oiled. Some motors are permanently
lubricated and do not need additional oil. Check for oiling instructions on burner or motor.
Do not drain boiler unless exposure to freezing temperatures will
occur.
Do not use antifreeze in steam systems.
Always keep manual fuel supply shut off if burner is shut down for
an extended period of time.
• Turn off switch at boiler and any external switch to boiler.
• Close fuel valves.
• Turn off water feed valve.
• Cover burner to protect from dust and dampness.
Part number 550-141-829/1211
5
Page 6
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
Operation
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
SGO with float-type low water cutoff
1. If burner does not fire, check for:
2. Correct problems found in step #1. If burner does not fire,
press reset button on burner primary control only once.
Repeated presses will deposit oil in combustion chamber.
• Switch on boiler or additional shut-off switches turned
off.
• Fuses or breaker switch tripped.
• Thermostat set below room temperature.
• Fuel valves turned off.
3. If burner still does not fire, call qualified service technician.
Burner must never be fired when oil is in combus-
tion chamber. Immediately call qualified service
technician.
• Not enough oil in tank to supply burner.
• No water in gauge glass.
Figure 1 SGO boiler with float-type low water cutoff (see Figure 2, page 7 for probe-type low water cutoff)
Steam relief valve
(on back of boiler)
Gauge glass
Tankless heater
control
located
in tankless
heater plate
(sizes 3-5)
or in tapping in
back section
(sizes 6-9)
Float-type
Low water cutoff
Burner
Disconnect
Plug
Pressure
control
Pressure
gauge
Service switch
On boiler
Reset button
on burner
primary
control
Burner
primary
control
6
Part number 550-141-829/1211
Page 7
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
Operation (continued)
SGO with probe-type low water cutoff
2. Correct problems found in step #1. If burner does not fire,
press reset button on burner primary control only once.
1. If burner does not fire, check for:
Repeated presses will deposit oil in combustion chamber.
• Service switch on boiler or additional switches turned off.
• Fuses or breaker switch tripped.
• Thermostat set below room temperature.
Burner must never be fired when oil is in combus-
tion chamber. Immediately call qualified service
technician.
• Fuel valves turned off.
• Not enough oil in tank to supply burner.
3. If burner still does not fire, call qualified service technician.
• No water in gauge glass.
Figure 2 SGO boiler with probe-type low water cutoff (see Figure 1, page 6 for float-type low water cutoff)
Pressure control
Pressure gauge
Steam relief valve
(on back of boiler)
Tankless heater
control
located in tankless
heater plate
(sizes 3-5)
or in tapping in
back section
(sizes 6-9)
Gauge glass
Burner
Disconnect
Plug
Probe-type
low water
cutoff
Service switch
on boiler
Reset button
on burner
primary
control
Burner
primary
control
Part number 550-141-829/1211
7
Page 8
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
Troubleshooting
Homeowners — The problems and corrections below represent common situations that can occur. There may be
others not listed below. It is important always to contact a qualified service technician if you have any questions
about the operation of your boiler or system.
Common problems Common causes Possible corrections
Rapid cycling - burner turns on
and off frequently.
Need to frequently add makeup
water.
Popping or percolating noise
heard in boiler.
Metal flakes found in flueway.
Isolated radiation does not heat.
Water disappearing from gauge
glass and back into system
through return piping.
Violent waterline fluctuations
- surging.
OR
Water passing into steam mains
- priming.
Domestic water from tankless
heater is hot then suddenly turns
cold.
Or
Domestic water from tankless
heater is always lukewarm.
ermostat installed where dras or
heat aect reading.
Heat anticipator in thermostat adjusted
incorrectly.
Incorrect limit setting. Have qualied service technician increase limit setting to
Leaks in boiler or piping. Have qualied service technician repair leaks at once to avoid
Mineral deposits in sections due to
constant use of makeup water. Or
incorrect pH.
Contaminated combustion air supply. Remove sources of hydrocarbons in or near boiler area.
Condensation of combustion gases. Have qualied service technician check boiler operation.
Air vents or traps inoperative. Have qualied service technician repair, clean or replace air
Incorrect hartford loop piping. Have qualied service technician pipe boiler exactly as
Check-valve inoperative. Have qualied service technician clean or replace check-
Vacuum-breaker inoperative. Have qualied service technician clean or replace vacuum
Dirt, oil or other impurities in water. Have qualied service technician skim boiler.
Waterline too high. Have qualied service technician adjust waterline to normal
Incorrect piping. Have qualied service technician pipe boiler exactly as
Sudden release of boiler steam pressure
by action of zone valves.
Mineral deposits insulate internal
waterways of heater.
Boiler stop-leak compound has been
added to boiler water and is insulating
outside of coil.
Incorrect mixing valve setting for
tankless heater.
Domestic ow rate too high. Have qualied service technician install ow check valve set
Incorrect setting on tankless heater
control.
Locate thermostat on inner wall away from heat sources or
cool dras.
Adjust heat anticipator to match current draw. Refer to boiler
wiring diagram.
decrease cycling. Normal operation is usually less than 5
psig.
constant use of makeup water.
Have qualied service technician de-lime boiler and repair
leaks at once to avoid constant use of makeup water and
check ph (7.0-8.5).
(Bleaches, cleaners, chemicals, sprays, fabric soeners, paint
remover, etc.)
vents or traps.
shown in boiler manual.
valve.
breake r.
height.
shown in boiler manual.
Have qualied service technician adjust valve operating time
or install slow-opening valves.
Have qualied service technician delime or replace coil.
Have qualied service technician remove and clean coil and
drain and ush boiler to remove stop-leak.
Have qualied service technician adjust mixing valve setting.
to rating of tankless heater.
Have qualied service technician raise tankless control
setting. Adjust dierential on tankless control to lower
setting.
8
Part number 550-141-829/1211
Page 9
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Before installing boiler
Homeowner — STOP! The procedures and information on this and following pages are intended only for a quali-
fied service technician who has the necessary equipment to inspect and adjust boiler and burner. A homeowner
should never attempt these procedures. The service technician must also read pages 1 through 8 before proceeding.
Installations must comply with
• United States
• State and local plumbing, heating and electrical codes.
• National codes where applicable.
• Canada
• Canadian Standards Association, CSA B139, Installation Code for
Oil-Burning Equipment.
• CSA C22.1 Canadian Electrical Code Part One.
• Applicable local or provincial codes.
Before selecting boiler location
• Check for nearby connections to:
• System water piping.
• Chimney. See page 16. Boiler can be top or back vented.
• Combustion and ventilation air supply. See page 10.
• Oil supply. See page 30 for oil line routing.
• Electrical power.
• Check area around boiler. Remove any combustible materials, gasoline
and other flammable liquids.
Failure to keep boiler area clear and free of combustible materials, gasoline and other flammable liquids and vapors
can result in severe personal injury, death or substantial property damage.
Figure 3 Recommended service clearances
Provide clearances around boiler
(see Figure 3)
Jacket cap must be in place on boiler to
avoid requiring an 9" minimum clearance
from back or top of boiler to combustible
material.
• MINIMUM clearances from vent pipe to combustible material:
• 6 inches — Type “L” double-wall vent
• 9 inches — Single-wall vent
Flue pipe clearances must take precedence
over jacket clearances.
• Recommended SERVICE clearances:
• 24 inches — Front and top
• 6 inches — Left side, back and right side
• 15 inches — Left side with tankless heater
• 12 inches — Right side for burner door swing
radius
Walls
A
B
C
Top View
A Provide 6" minimum clearance for service, provide 12" minimum clearance for
burner door swing.
B Provide 6" minimum clearance for service.
C Provide 6" minimum clearance for service, provide 15" left side with tankless heater.
D Minimum clearance from vent pipe to combustible material: 6" for type “L” double-
wall vent, 9" for single-wall vent.
24"
D
Wall
D D
Ceiling
24"
Floor
Part number 550-141-829/1211
9
Page 10
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Before installing boiler (continued)
Provide air for combustion and ventilation
Do not install exhaust fan in boiler room.
Adequate combustion and ventilation air:
• Assures proper combustion.
• Reduces risk of severe personal injury or death from possible flue gas
leakage and carbon monoxide emissions.
Older buildings with single-pane windows, minimal weather-stripping and
no vapor barrier often provide enough natural infiltration and ventilation
without dedicated openings.
New construction or remodeled buildings are most often built tighter.
Windows and doors are weather-stripped, vapor barriers are used and
openings in walls are caulked. As a result, such tight construction is unlikely
to allow proper natural air infiltration and ventilation.
Follow state, provincial or local codes when sizing adequate combustion and
ventilation air openings. In absence of codes, use the following guidelines
when boiler is in a confined room (defined by NFPA 31 as less than 7200
cubic feet per 1 GPH input of all appliances in area. A room 8 ft. high x
33.5 ft. x 33.5 ft. is 7200 cu. ft.):
• Provide two permanent openings — one within 12 inches of ceiling,
one within 12 inches of floor. Minimum height or length dimension
of each rectangular opening should be at least 3 inches.
• When inside air is used — each opening must freely connect with areas
having adequate infiltration from outside. Each opening should be at
least 140 sq. in. per 1 GPH input (1 sq. in. per 1000 Btu input) of all
fuel-burning appliances plus requirements for any equipment that can
pull air from room (including clothes dryer and fireplace).
• When outside air is used — connect each opening directly or by ducts
to the outdoors or to crawl or attic space that freely connects with
outdoors. Size per below:
• Through outside wall or vertical ducts — at least 35 sq. in. per 1
GPH input (1 sq. in. per 4000 Btu input) of all fuel-burning appliances plus requirements for any equipment that can pull air from
room (including clothes dryer and fireplace).
• Through horizontal ducts — at least 70 sq. in. per 1 GPH boiler
input (1 sq. in. per 2000 Btu input) of all fuel-burning appliances
plus requirements for any equipment that can pull air from room
(including clothes dryer and fireplace).
• Where ducts are used, they should have same cross-sectional area as
free area of openings to which they connect. Compensate for louver,
grille or screen blockage when calculating free air openings. Refer to
their manufacturer’s instructions for details. If unknown, use:
• Wood louvers, which provide 20-25% free air.
• Metal louvers or grilles, which provide 60-75% free air.
• Lock louvers in open position or interlock with equipment to prove
open before boiler operation.
Lay a foundation, if needed
Boiler may be installed on non-carpeted combustible
flooring.
For residential garage installation, install boiler so
burner is at least 18 inches above floor to avoid contact
with gasoline fumes.
A level concrete or masonry foundation is required
when:
• Floor could possibly become flooded.
• Non-level conditions exist.
Solid concrete blocks can be used to create a pad.
Table 1 Boiler foundation sizes
Boiler
model
SGO-3
SGO-4
SGO-5
SGO-6
SGO-7
SGO-8
SGO-9
Length
inches
17 22 2
20 22 2
23 22 2
26 22 2
29 22 2
32 22 2
35 22 2
Width
inches
Min.
height
inches
10
Part number 550-141-829/1211
Page 11
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install boiler — packaged boilers only
Place boiler
1. Remove boiler from pallet.
Do not drop boiler or bump jacket on
floor or pallet. Damage to boiler can
result.
Smaller sized boilers may be top heavy.
Use caution when handling to avoid
minor personal injury or property damage.
2. Boiler is shipped for back flue outlet. To change to
top flue outlet (see Figure 4):
a. Remove jacket cap on top of boiler.
b. Loosen two screws holding flue cap strap to
collector hood. Remove strap and flue cap from
opening. Re-tighten screws.
c. Check rope placement inside flue cap.
(Read under step #5 below).
d. Loosen two screws on back flue outlet. Set flue
cap on outlet. Install strap by engaging slots
in screws. Tighten screws. Make sure cap is
securely installed.
e. Snap jacket cap in back outlet opening.
Jacket cap must be in place on boiler to
avoid requiring an 18" minimum clearance from back of boiler to combustible
material.
3. Check level. Shim legs, if needed.
4. Check for secure placement of insulation on target
wall, chamber floor and burner door.
5. Visually check:
a. Flue collector hood seal.
b. Burner mounting door seal.
Perform hydrostatic pressure test
1. Remove steam pressure gauge furnished with boiler. Install water pressure gauge for test only. Be sure gauge can handle test pressure.
2. Install air vent in tapping on top of boiler.
3. Remove pressure control and low water cutoff. Plug tappings.
4. Plug supply and return tappings.
5. Drain valve is already factory-installed.
6. Fill boiler. Vent all air. Pressure test boiler at 45-55 psig.
Do not leave boiler unattended. Cold water fill can expand
and damage cast iron, resulting in severe personal injury,
death or substantial property damage.
7. Check for maintained gauge pressure for more than 10 minutes. Visually check for leaks if gauge pressure drops.
8. Drain boiler. Repair leaks if found.
Using petroleum-based compounds to repair leaks can dam-
age system components, resulting in property damage.
9. Retest boiler after repairing leaks.
10. Remove pressure gauge, air vent and plugs. Re-install steam pressure
gauge, pressure control and low water cutoff furnished with boiler.
Figure 4 Change from back flue outlet to top flue outlet (optional)
Obtain gas-tight seal to prevent possible
flue gas leakage and carbon monoxide
emissions, which can lead to severe personal injury or death.
Tankless heater, if used
1. Remove tankless heater knockout in left side of
jacket panel and, for SGO-6 only, tankless heater
control knockout.
2. Remove tankless heater cover plate and gasket.
3. Install new gasket and tankless heater over studs
around opening. Secure with 3/8" nuts.
4. Install tankless heater operating control where
shown on page 23. If not furnished, use operating
control with maximum 10°F differential.
Part number 550-141-829/1211
Instructions for packaged boilers continued on
page 16.
11
Page 12
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install boiler — non-packaged boilers only
Fiberglass wool and ceramic fiber materials are
possible cancer hazards. See warning on page 37.
Place boiler
1. Non-Packaged SGO-3 through 6 — position on site.
Smaller sized boilers may be top heavy. Use caution
when handling to avoid minor personal injury or
property damage.
a. Boiler is shipped for back flue outlet. To change to top
flue outlet (see Figure 5, page 13):
• Loosen two screws holding flue cap strap
to collector hood. Remove strap and flue cap from
opening. Re-tighten screws.
• Check rope placement inside flue cap.
(Read under step #3 at right).
• Loosen two screws on back flue outlet.Set flue cap
on outlet. Install strap by engaging slots in screws.
Tighten screws. Make sure cap is securely installed.
2. Non-Packaged SGO-7, 8 & 9 — split the assembled block for
easier handling (see Figure 5):
a. Open burner mounting door and using utility knife, slit
floor insulation at joint to be separated.
b. Remove 5½" draw rod and the longest draw rod from
each side. Pull block apart. Save draw rods, nuts, washers
and sealing rings for reassembly.
c. Move divided block to location.
d. Clean port openings with clean rag.
Do not use petroleum-based compounds to clean
openings. Damage to system components can
result causing property damage.
e. Place rings in port openings. If ring slips out of groove,
stretch ring gently for several seconds, then place in
groove.
f. Position sections so aligning lugs fit into sockets of next
section. Make sure sealing rope is in good condition and
in position.
g. Oil threads on draw rods. Install washer and nut on end
to be tightened. Use nut only on other end.
h. With wrench at washer/nut end, uniformly
tighten nuts starting with 5½" rod at large port, 5½" rod
at small port, bottom long rod and finally top long rod.
a. Torque on both 5½" rods and bottom long rod should
be 50-60 ft. lbs; long top rod should be 20-25 ft. lbs. Do
not back-off nuts.
b. Metal-to-metal contact should be made around port
openings. If gap does exist, it should be less than .020".
Check with feeler gauge.
c. If gap around port openings exceeds .020", check for
dirt on port openings, sockets or misaligned lugs. If
corrections are made and gap still exists, contact your
Weil-McLain distributor or sales office before continuing installation.
3. Non-Packaged SGO-7, 8 & 9 — install flue collector hood
(see Figure 5):
Obtain gas-tight seal to prevent possible flue gas
leakage and carbon monoxide emissions, leading
to severe personal injury or death.
a. Thread tinnerman clip on screw so that clip fits snugly
in notch of hold-down lug. Screw must not turn.
b. Remove paper on sealing rope. Starting at back section
near flue collar, position sealing rope around top of block
with adhesive side to sections. Do not stretch rope. Make
sure rope ends meet. Trim excess rope.
c. Position flue collector hood on top of boiler sections and
over screws and clips as shown in Figure 5.
d. Install washers and nuts. Tighten nuts until collector hood
makes contact with tinnerman clip.
e. Position flue cap
• Back flue outlet boiler — Position flue cap and strap
over opening in flue collector hood. Make sure rope
in cap is in place and in good condition. Tighten strap
to hood with screws provided.
• Top flue outlet boiler — Position flue cap and strap
over opening in back section. Make sure rope in cap
is in place and in good condition. Tighten strap to
boiler with screws provided in section. Install remaining screws in holes in flue collector hood.
4. Check level. Shim legs, if needed.
Tankless heater, if used
1. SGO-3 through 6 — remove knockout in left side jacket
panel, and for SGO-6 only, remove tankless heater control
knockout.
2. Remove tankless heater cover plate and gasket.
3. Install new gasket and tankless heater over studs around
opening. Secure with 3/8" nuts.
12
Part number 550-141-829/1211
Page 13
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install boiler — non-packaged boilers only (continued)
Figure 5 Change from back flue outlet to top flue outlet (optional)
Nut
Washer
Tinnerman
clip
Screw
Hold-down
Flue cap
strap
lug
Sealing
rope in
groove
inside cap
Flue
cap
Flue
collector
hood
Sealing
rope with
adhesive
tape
Separate
block here
for easier
handling
Part number 550-141-829/1211
13
Page 14
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install boiler — non-packaged boilers only (continued)
Perform hydrostatic pressure test
1. Refer to Figure 6 and Control Tapping Table 2, to
install:
a. Boiler drain.
b. Water pressure gauge (test only). Be sure gauge
can handle test pressure.
c. Air vent in tapping on top of boiler.
d. Plugs in remaining tappings.
2. Fill boiler. Vent all air. Pressure test boiler at 45-55
psig.
Do not leave boiler unattended. Cold
water fill could expand and damage cast
iron, resulting in severe personal injury,
death or substantial property damage.
3. Check for maintained gauge pressure for more
than 10 minutes. Visually check for leaks if gauge
pressure drops.
4. Drain boiler. Repair leaks if found.
Do not use petroleum-based compounds
to repair leaks. Damage to system components can result, causing property
damage.
5. Re-test boiler after repairing leaks.
6. Remove pressure gauge, air vent and plugs from
tappings used for controls.
7. Visually check:
a. Sealing rope placement
b. Metal-to-metal contact around port openings.
c. Flue collector hood seal.
d. Burner mounting door seal.
Obtain gas-tight seal to prevent possible
flue gas leakage and carbon monoxide
emissions, which can lead to severe personal injury or death.
Table 2 Control tappings (see Figure 6, page 15 for locations)
Location Size Function
A1 1½" Skim tapping
A2 2½" Supply piping (sizes 3 - 9)
A3 2½" Supply piping (sizes 6 - 9)
B1 1½" Plugged
B2 2" Return piping
E1 & E2 ½" Float LWCO
E1 ½"
E2 ½" Plugged when using probe LWCO
H ¾" Drain valve
L ¾"
Steam pressure gauge and limit
Control when using probe LWCO
Steam pressure gauge and limit
Control when using float LWCO
Plugged when using probe LWCO)
Install jacket
(sizes 7 through 9 only)
Before installing jacket, remove burner mounting door.
See jacket instructions for details.
Install boiler controls
See control tapping location, Figure 6, control tappings,
Table 2, and Figure 7 or Figure 8 on page 15 to install
controls.
1. Do not use Teflon tape to install probe-type low
water cutoff; it will cause low water cutoff to work
improperly.
2. Install tankless heater control if tankless heater is
used. If not furnished, use operating control with
maximum 10°F differential.
3. Make sure gauge glass is last control installed to
prevent breakage.
4. Affix CP number label(s) on jacket front panel.
14
P ¾" Probe LWCO (plugged when using float LWCO)
R ¾" Relief valve
S1 & S2 ½" Gauge glass
U1 1"
U2 ¾"
U3 ¾"
Indirect-fired water heater/ hot water baseboard
supply
Operating control for tankless heater (sizes 6-9)
or operating control for indirect-fired water heater
(sizes 3-9)
Operating control for tankless heater (located in
heater plate — sizes 3-5)
Part number 550-141-829/1211
Page 15
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install boiler — non-packaged boilers only (continued)
Figure 6 Control tapping
locations (for use with
Table 2, page 14)
A1 A2S1
E1
E2
U3
S2
B1
Front Section
Figure 7 Steam boiler controls with float-type LWCO (optional tankless heater control)
L
SGO3-5 tankless
heater control
location
P
SGO6-9 tankless
heater control
location
Float-type low
water cutoff
H
Steam pressure
control
Steam pressure
gauge
Siphon
Gauge glass
and cocks
Drain valve
R U1
A3
Back Section
U2
B2
Figure 8 Steam boiler controls with probe-type LWCO (optional tankless heater control)
Steam pressure
Steam pressure
Siphon
SGO-3 to SGO-5
tankless heater
control
SGO-6 to SGO-9
tankless heater
control
Probe-type
low water
Gauge glass
and cocks
Drain
Part number 550-141-829/1211
15
Page 16
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install burner — all boilers
Install burner
(also refer to instructions packed with
burner)
Use only burners specified for use on
Weil-McLain GOLD oil boilers. DO
NOT use burners specified for use on
Weil-McLain Model 68 boilers. Contact
individual burner manufacturers for
proper burner selections.
For P-SGO and A-SGO boiler:
1. Secure universal mounting flange and gasket to
burner mounting door. Use three bolts provided.
2. Secure burner on flange with three bolts.
3. Position burner so end of air tube is level to
1½-degree tilt down toward chamber. Open door
to verify burner position. End of air tube should be
flush to ¼" recessed from inside wall of burner door
refractory. Check for secure placement of insulation
on target wall, chamber floor and burner mounting
door. Securely close door.
General chimney requirements
• Designed for natural draft firing. Connect boiler
to vertical chimney.
Insufficient draft can cause flue gas leak-
age and carbon monoxide emissions,
which will lead to severe personal injury
or death.
• Use vent material approved by local codes for oilfired burners. In their absence, refer to:
• NFPA 31, Installation of Oil-Burning Equip-
ment.
• NFPA 211, Standard for Chimneys, Fireplaces,
Vents and Solid Fuel Burning Appliances.
• In Canada, refer to CSA B139, Installation Code
for Oil-Burning Equipment.
• NFPA 211 requires chimney to be lined before connected to boiler.
Table 3 Minimum chimney sizes
Boiler
model
number
SGO-3 5" 8" x 8"
SGO-4 6"
SGO-5 6"
SGO-7
SGO-8
SGO-9
Note 1 6¾" x 6¾" inside liner
Note 2 6½" x 10½" inside liner
Note 3 Flue collar on boiler is 7' diameter
Minimum
breeching
diameter
(Note 3)
7"
7"
Minimum I=B=R chimney
size
Rect. Round
(Note 1) 6" 15'
8" x 8"
(Note 1) 7" 15'SGO-6
8" x 12"
(Note 2)
7" 20'
Minimum chimney
height
Inspect existing chimney before installing new boiler. Failure
to do any of the following will result in severe personal injury
or death:
• Clean chimney, including removal of blockage.
• Repair or replace damaged pipe or liner.
• Repair mortar and joints.
To prevent downdrafts, extend chimney at least 3 feet above highest point
where it passes through roof and 2 feet higher than any portion of building
within 10 feet. Increase chimney cross-sectional area and height at least
4% per 1,000 feet above sea level.
• Minimum clearances from vent pipe to combustible material:
• 6 inches — Type “L” double-wall vent
• 9 inches — Single-wall vent
• Minimum chimney sizes should be used.
Oversized chimneys, outside masonry chimneys and/or der-
ated inputs can result in condensation in chimney.
16
Part number 550-141-829/1211
Page 17
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect breeching
Connect breeching
Long horizontal breechings, excessive
number of tees and elbows, or other
obstructions restricting combustion
gas flow can result in possibility of condensation, flue gas leakage and carbon
monoxide emissions, which can lead to
severe personal injury or death.
1. Install 2 flue pipe brackets.
2. Connect full-sized breeching when possible. See
Minimum Chimney Size Table.
• Back outlet — see Figure 9.
• Top outlet — see Figure 10.
3. Connection must be made above bottom of
chimney to avoid blockage. Breeching must not
enter chimney far enough to cause obstruction.
Use thimble or slip joint where breeching enters
chimney to allow removal for cleaning.
4. When burner and boiler are properly installed, draft
overfire will be approximately -0.01" to -0.02" W.C.
Install barometric control in breeching, per control
manufacturer’s instructions, when excess draft
needs to be relieved or to comply with applicable
codes and regulations. Use draft gauge to adjust
proper opening.
5. An induced draft fan for the chimney may be
necessary if:
• Excessive resistance to flow of combustion gases
can be expected.
• Cross-sectional area of chimney is smaller than
minimum recommended.
• Chimney height is less than recommended.
Seal all vent joints. Interlock burner with
fan operation.
Figure 9 Back outlet breeching connection
Typical location for
barometric control
(Also see control
manufacturer’s
instructions)
Flue pipe
bracket
(One on each
side of pipe)
Figure 10 Top outlet breeching connection
Typical location for
barometric control
(Also see control
manufacturer’s
instructions)
Part number 550-141-829/1211
Flue pipe bracket
(One on each side
of pipe)
17
Page 18
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect steam piping
General piping information
• Hartford Loop piping arrangement and wet return are required for
steam boilers.
• Maintain 24-inch minimum from waterline to bottom of header
(minimum 50
7
/8" from floor or top of foundation).
• When using condensate receiver, feed pump must be energized by
boiler-mounted pump control.
• Use swing joints in steam piping.
• If installation is to comply with ASME or Canadian requirements, an
additional pressure limit control is needed. Install control between existing pressure control and pressure gauge. Control must be installed with
siphon (supplied with boiler) between control and boiler. Set control
to minimum of 5 psi above setpoint of existing control and maximum
setting of 15 psi. Wire as shown on boiler wiring diagram.
Install piping
1. See Table 4 at right and Figure 11, page 19 or Figure 12, page 20.
Improperly piped systems or undersized piping can con-
tribute to erratic boiler operation and possible boiler
or system damage. Piping system must be installed as
shown, using minimum pipe sizes shown. Consult your
Weil-McLain distributor or sales office before installing
alternate piping.
2. Install relief valve vertically in “R” tapping on back of boiler. See
Figure 11 or Figure 12 and also refer to tag attached to relief valve for
manufacturer’s instructions.
Table 4 Steam piping size table
One and two-pipe systems
Boiler
Model
Number
SGO-3
SGO-4
SGO-5 2½" — 3" 1½"
SGO-6 2½" 2½" 3" 1½"
SGO-7 2½" 2½" 3" 1½"
SGO-8 2½" 2½" 3" 1½"
SGO-9 2½" 2½" 3" 1½"
SGO-3 2½" — 2½” 1½"
SGO-4 2½" — 2½" 1½"
Riser Pipe
Size
(Note 1)
A B
2½"
(Note 3)
2½"
(Note 3)
One-pipe counterow systems
— 2½” 1½"
— 2½" 1½"
Header
Pipe Size
“H”
(Note 2)
Equalizer
Pipe
Size
“J”
Pipe relief valve discharge line near floor close to floor drain
to eliminate potential of severe burns. Do not pipe to any
area where freezing could occur. Do not plug, valve or place
any obstruction in discharge line.
3. Float-type low water cutoff only — install blowdown line in bottom
of cutoff. See Figure 11 or Figure 12 and also refer to low water cutoff
manufacturer’s instructions for details.
Pipe blowdown line near floor close to floor drain to eliminate
potential of severe burns. Do not pipe to any area where freezing could occur. Do not plug, valve or place any obstruction
in discharge line.
To connect SGO boilers to indirect-fired water
heaters
Install and wire per water heater manual provided with water heater.
If boiler already has a tankless heater installed:
• Remove tankless heater and install cover plate.
OR
• Leave tankless heater installed. Drain coil and remove piping. Do not
plug holes in tankless heater front plate.
SGO-5 2½" — 3" 1½"
SGO-6 2½" 2½" 4" 1½"
SGO-7 2½" 2½" 4" 1½"
SGO-8 2½" 2½" 4" 1½"
SGO-9 2½" 2½" 4" 1½"
Based on ASHRAE Fundamentals
Note 1
Note 2
Note 3
Handbook recommendations, allowing ½
oz. pressure drop at 0 psig.
Based on ASHRAE Fundamentals
Handbook recommendations, allowing 2
oz. pressure drop per 100 feet of pipe at 3.5
psig. Maintain minimum 24" height from
waterline to bottom of header.
Can be reduced to 2"
18
Part number 550-141-829/1211
Page 19
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect steam piping (continued)
Figure 11 Steam piping for sizes 3 through 5 (see Figure 12, page 20, for sizes 6 through 9)
Part number 550-141-829/1211
19
Page 20
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect steam piping (continued)
Figure 12 Steam piping for sizes 6 through 9 (see Figure 11, page 19 for sizes 3 through 5)
20
Part number 550-141-829/1211
Page 21
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect steam piping (continued)
Figure 13 Typical piping (one riser shown on boiler)
Optional reservoir piping
Modern steam boilers are designed to steam for less
time than older, larger boilers. When replacing an older
steam boiler, the system condensate return time may
be longer than the steaming time. This can cause the
following problems:
• Boilers fitted with an automatic water feed could
overfill.
• Units fitted with only a low water cutoff would
shut down and cycle while waiting for condensate
to return.
Table 5 Condensate receiver capacity
Boiler
Model
SGO-3
SGO-4
SGO-5
SGO-6
SGO-7
SGO-8
SGO-9
I=B=R gross
output lbs
steam per hour
114 14 4 8 12 16 0.5
150 18 5 11 16 22 0.6
180 22 6 13 19 26 0.7
216 26 8 16 23 31 0.9
246 30 9 18 27 35 1.0
274 33 10 20 30 39 1.1
303 36 11 22 33 44 1.2
Gallons
condensate
per hour
To size and install reservoir piping, see Figure 13 and Bulletin AE-8403
(available through your Weil-McLain distributor or sales office):
1. Pipe boiler as shown on page 18 through page 20.
2. Use 8" diameter reservoir pipe.
7
3. Locate centerline of reservoir pipe 1" below 26
Minimum condensate receiver capacity – gal.
15 Min.*
Boiler
operation
30 Min.*
Boiler
operation
45 Min.*
Boiler
operation
60 Min.*
Boiler
operation
/8" boiler waterline.
Recommended
condensate feed
pumping rate gpm at
15 psi
Part number 550-141-829/1211
* Maximum time to when condensate returns to boiler.
21
Page 22
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect tankless heater piping
To pipe tankless heater
Hot Water Can Scald!
1. Size piping no smaller than tankless heater inlet
• Consumer Product Safety Commission and
some states recommend domestic hot water
temperature of 130°F or less.
• When installing an automatic mixing valve,
selection and installation must comply with
valve manufacturer’s recommendations and
instructions.
• Water heated to a temperature suitable for
clothes washing, dish washing and other sanitizing needs will scald and cause injury.
• Children, elderly, infirm or physically handicapped persons are more likely to be injured
by hot water. Never leave them unattended in
or near a bathtub, shower or sink. Never allow
small children to use a hot water faucet or draw
their own bath. If anyone using hot water in the
building fits this description, or if state laws or
local codes require certain water temperatures at
hot water faucets, take special precautions:
• Install automatic mixing valve set according
to those standards.
• Use lowest practical temperature setting.
• Check water temperature immediately after
first heating cycle and after any adjustment.
and outlet.
2. Following controls (furnished by others) must be
installed:
a. Automatic mixing valve. See Figure 14.
b. Flow regulating valve. Size according to inter-
3. Additional anti-scald devices may be installed at
each hot water faucet, bath and shower outlet.
4. In hard water areas, soften cold domestic supply
water to heaters to prevent lime build-up.
(Read
mittent draw of tankless heater. See Table 6below. Follow valve manufacturer’s instructions
to install.
Studies have indicated that danger-
at left.)
ous bacteria can form in potable
water distribution systems if certain
minimum water temperatures are
not maintained. Contact local health
department for more information.
Table 6 Tankless heater ratings
Boiler
model
number
SGO-3
SGO-4
SGO-5
SGO-6
SGO-7
SGO-8
SGO-9
Note 1
Note 2
Heater
number
35-S-29 3.25 ¾"
35-S-29 3.50 ¾"
35-S-29 3.75 ¾"
35-S-29 4.00 ¾"
35-S-29 4.00 ¾"
35-S-29 4.00 ¾"
35-S-29 4.00 ¾"
To avoid supplying steam to system during summer tankless operation, raise water level to one inch
above normal water line.
Gallons of water per minute heated from 40°F to 140°F with 200°F boiler water temperature. Tested in
accordance with I=W=H testing and rating standard for indirect tankless water heaters tested with boilers.
Intermittent
draw
ratings
(gpm)*
Inlet
and outlet tapping sizes
22
Part number 550-141-829/1211
Page 23
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect tankless heater piping
Figure 14 Tankless heater piping
SGO 3-5 tankless
heater control location
Flow
regulating valve
Cold water
supply
SGO 6-9 tankless heater
control location
Mixed
12" Min.
Hot
Cold
ese single wall heat exchangers comply with National Standard
Plumbing Code provided that:
• Boiler water (including additives) is practically non-toxic,
having a toxicity rating or class of 1, as listed in Clinical
Toxicology of Commercial Products.
• Boiler water pressure is limited to max. 15psig by approved
steam relief valve.
Automatic mixing
valve
Part number 550-141-829/1211
23
Page 24
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect wiring — general information
General wiring requirements
Electric shock hazard. Can cause severe
personal injury or death if power source,
including service switch on boiler, is not
disconnected before installing or servicing.
• Installations must follow these codes:
• National Electrical Code, ANSI/NFPA 70, lat-
est edition and any additional national, state
or local codes.
• In Canada, CSA C22.1 Canadian Electrical
Code Part One and any local codes.
• Wiring must be N.E.C. Class 1. If original wire as
supplied with boiler must be replaced, type 105°C
wire or equivalent must be used. Supply wiring to
boiler and additional control wiring must be 14
ga. or heavier.
• Provide electrical ground at boiler as required
by codes.
Thermostat wiring
• Install thermostat on inside wall away from influences of drafts, hot or cold water pipes, lighting
fixtures, television, sun rays or fireplaces.
• Follow instructions with thermostat. If it has a
heat anticipator, set heat anticipator in thermostat
to match power requirements of equipment connected to it. Boiler wiring diagrams give setting for
standard equipment.
Junction box (furnished)
• Junction box houses electrical connections for all
boiler components.
• “P” boilers have harnesses furnished.
• “A” boilers are furnished with burner and limit
harnesses.
• All field-provided high voltage wiring must be
sheathed in flexible metal conduit.
• Connect incoming line voltage “HOT” wire to
service switch, and neutral wire to white wire.
Field-install equipment ground wire to green wire
with wire nut.
• Service switch (15 amp) is provided with boiler. “A”
boilers — install switch as shown.
• Some local codes may require an emergency shutoff switch installed at a location away from boiler.
Follow local codes.
Burner wiring
• Burner harness incorporates a disconnect plug,
providing a convenient way to disconnect wiring
when burner mounting door is opened.
• All “P” boilers have a power disconnect plug installed on burner.
• On “A” boilers, mount the plug (provided in steam
trim carton) on the burner housing as shown
in Figure 18, page 27, or Figure 20, page 29. For
Carlin burners, screw burner plug into threaded
conduit coupling, then mount this assembly to the
burner housing using the chase nipple. Route wires
through housing and make connections in burner
junction box as shown in boiler wiring diagram.
High temperature limit
• To comply with ASME, UL 726 or Canadian requirements, an additional high temperature limit
is needed.
• Install the secondary control in the supply piping
between boiler and isolation valve.
• Set the control to a minimum of 20˚F above the set
point of the combination control.
• The maximum allowable set point is 220˚F.
• Wire the control as shown on page 26 (float-type
LWCO) or page 28 (probe-type LWCO).
24
Part number 550-141-829/1211
Page 25
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect wiring — general information (continued)
Blocked vent shutoff switch
In Canada, a blocked vent shutoff switch
kit must be installed (see parts list
page 38). See Figure 15.
Electric shock hazard. Turn off electrical
power supply at service entrance panel
before making any electrical connections
to avoid possible electric shock hazard.
Failure to do so can cause severe personal
injury or death.
After installing BVSS switch, proceed as follows
1. Disconnect power.
2. Install Spill Switch (BVSS) Wiring Harness (P/N
591-391-942) as follows:
a. Remove cover from BVSS Box.
b. Install straight fitting end of the harness on the
BVSS Box. Install elbow (90º) end fitting on the
Boiler Junction Box (see Figure 15).
c. Install both the fork ends to the screw terminals
on the BVSS Switch as per the wiring diagram,
(see Figure 17).
d. Replace BVSS box cover.
To wire blocked vent safety switch, see:
Figure 16, page 26 for float-type LWCO
Figure 19, page 28 for probe-type LWCO
Figure 15 Blocked vent shutoff switch installation
Part number 550-141-829/1211
25
Page 26
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect wiring
Figure 16 Boiler wiring for float-type LWCO — see Figure 18, page 27 for component locations
(Float-type LWCO)
26
Part number 550-141-829/1211
Page 27
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect wiring
Figure 18 Boiler wiring for float-type LWCO — component
locations for wiring diagram, Figure 16, page 26
5
(Float-type LWCO)
(continued)
Blocked vent safety switch (BVSS),
when required
In Canada, a blocked vent shutoff switch kit
must be installed (see parts list page 38). See Fig-
1
The BVSS wiring diagram in Figure 17 shows
1. Locate and remove boiler junction box cover.
2. Locate wire nut with yellow and black wire (if more than one
exists, pick the one with black wire going to burner harness).
Clip the wire nut.
2
2
4
3. Strip 1/2" from the ends of both the black and the yellow
wires.
4. Clip the quick connects from the blue wires coming from the
BVSS Harness and strip 1/2" from the ends.
5. Using two wire nuts from the kit, wire the blue wires in series
with the black and yellow wires (see Figure 17).
6. Replace junction box cover.
7. Turn on power and verify safe operation of the appliance per
GO Boiler Manual.
8. Restore boiler to normal operation.
ure 15, page 25.
boiler wiring only up to the burner disconnect.
For additional information, refer to manufacturer’s
instructions.
Figure 17 BVSS wiring diagram (float-type LWCO)
3
1 Pressure control wiring harness
2 Tankless heater control wiring
3 Burner disconnect plug
4 Burner wiring harness
5 Low water cutoff wiring harness (not furnished
on “A” boilers)
120 vac field wiring 120 vac factory wiring
Part number 550-141-829/1211
27
Page 28
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect wiring
Figure 19 Boiler wiring for probe-type LWCO — see Figure 20, page 29 for component locations
(Probe-type LWCO)
28
Part number 550-141-829/1211
Page 29
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect wiring
Figure 20 Boiler wiring for probe-type LWCO — component
locations for wiring diagram, Figure 19, page 28
(Probe-type LWCO)
1
5
2
(continued)
Blocked vent safety switch (BVSS),
when required
In Canada, a blocked vent shutoff switch kit
must be installed (see parts list page 38). See Figure 15, page 25.
The BVSS wiring diagram in Figure 21 shows
boiler wiring only up to the burner disconnect.
For additional information, refer to manufacturer’s
instructions.
1. Locate and remove boiler junction box cover.
2. Locate wire nut with two black wires (if more than one exists,
pick the one with black wire going to the burner harness).
Clip the wire nut.
3. Strip 1/2" from the end of both the black wires.
4. Clip the quick connects from the blue wires coming from the
BVSS Harness and strip 1/2" from the ends.
5. Using two wire nuts from the kit, connect the blue wires in
series with the two black wires (see Figure 21).
6. Replace junction box cover.
7. Turn on power and verify safe operation of the appliance.
8. Restore boiler to normal operation.
4
Figure 21 BVSS wiring diagram (probe-type LWCO)
3
1 Pressure control wiring harness
2 Tankless heater control wiring
3 Burner disconnect plug
4 Burner wiring harness
5 Low water cutoff wiring harness (not furnished
on “A” boilers)
Part number 550-141-829/1211
120 vac field wiring 120 vac factory wiring
29
Page 30
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect oil piping
General oil piping requirements
• Location and installation of oil tanks, oil piping
and burners must follow:
• NFPA 31, Standard for the Installation of Oil-
Burning Equipment.
• In Canada, CSA B139, Installation of Oil-
Burning Equipment.
• Local codes and regulations.
• Information provided with burner and
fuel pump.
• If any part of fuel oil tank is above level of burner,
installation of an anti-siphon device is highly
recommended to prevent flow of oil in case of oil
line break.
• Support oil lines as required by codes.
• Make tank connections with swing joints or
copper tubing to prevent breaking in case
the tank settles. Make swing joints so they
will tighten as tank settles. Non-hardening
pipe joint compounds should be used on
all threads.
Do not use Teflon tape as an oil pipe
sealant. It can cause valves to fail, creating
hazards. Do not use compression fittings,
only flare fittings.
• Underground pipe must be run in a casing to prevent oil leaking into ground or under floor. Check
local codes for information.
Figure 22 Recommended oil piping connection to burner
Oil piping connection at burner
• See Figure 22 for recommended connection at
burner, allowing burner mounting door to swing
open completely for servicing.
30
Part number 550-141-829/1211
Page 31
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
Start up
SERVICE TECHNICIAN ONLY — read and follow completely.
Fill the system
1. Do not fill (except for leakage tests) until boiler is
ready to be fired.
2. Fill to normal water line as indicated on jacket
front panel.
3. Boiler water pH 7.0 to 8.5 is recommended.
Failure to maintain recommended pH
level can cause section failure and leaks.
4. Follow “Skim steam boiler” to assure proper operation.
Tips for steam systems
• Check boiler and system piping for leaks. Continual
makeup water will reduce boiler life. Minerals can
build up in sections, reducing heat transfer and causing cast iron to overheat, resulting in section failure.
Failure to maintain recommended pH
and repair leaks can cause section iron
corrosion, leading to section failure and
leaks. Do not use petroleum-based sealing or stop-leak compounds in boiler
system. Damage to system components
can result.
• For pH conditions outside 7.0 to 8.5 range or unusually hard water areas (above 7 grains hardness),
consult local water treatment company.
Skim steam boiler
Clean new steam boilers to remove any
impurities. Failure to properly clean can
result in violent water level fluctuations,
water passing into steam mains, or high
maintenance costs on strainers, traps or
vents. Skim boiler only. Do not clean old
piping or leaks can occur.
Do not use petroleum-based compounds
in boiler system. Damage to system
components can result, causing property
damage.
1. Provide 1½" skim piping from skim tapping
to floor drain. Add a tee in piping to observe
skim water level. Raise waterline to midpoint of
skim tapping.
2. Fire burner to maintain water temperature below
steaming temperature during skimming process.
3. Feed in water to maintain water level. Cycle burner
to prevent rise in steam pressure. Continue skimming until discharge is clear.
4. While boiler is warm, but not hot, drain boiler
through drain valve.
5. Remove skim piping. Close drain valve. Fill with
fresh water to normal waterline. Start burner and
steam for 15 minutes to remove dissolved gases.
Stop burner.
6. Check traps and air vents for proper operation.
7. Process may need to be repeated after several weeks
of operation.
To place in operation
1. Verify boiler is filled with water to normal waterline
as indicated on jacket front panel.
2. Open burner door and verify rear target wall, floor
and burner door insulations are in proper position
and condition.
3. Verify burner mounting door is closed tightly and
burner wiring harness is connected to junction
box.
4. Factory burner adjustment and settings may not
be suitable for specific job conditions. See “Burner
adjustments for packaged and non-packaged boilers” on page 36.
Make final burner adjustments using
combustion test equipment to assure
proper operation. Do not fire boiler
without water. Sections will overheat,
damaging boiler and resulting in substantial property damage.
5. Check boiler and system piping for leaks. See “Tips
for steam systems.”
6. Inspect breeching and venting for proper operation.
Part number 550-141-829/1211
31
Page 32
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Check out procedure
Check off steps as completed
Boiler properly filled with water?
Boiler piping checked for leaks (including tankless heater, if used)?
System vents operating properly?
Boiler properly skimmed?
Air purged from oil piping? Piping checked for leaks?
Flue cap in place and tightened? Burner door closed, sealed and nut tight? Burner plugged in and service
switch on?
Obtain gas-tight seal to prevent possible flue gas leakage and carbon monoxide emissions, leading
to severe personal injury or death.
Proper draft and burner flame? Final adjustment made with combustion test equipment?
Test pressure control: While burner is operating, move indicator on limit control below actual boiler steam pres-
sure. Burner should go off. Raise setting on pressure control above steam pressure and burner should re-ignite.
Test low water cutoff(s): Follow control manufacturer’s instructions for testing procedures. Make sure burner
goes off when control responds to low water condition. Burner should re-ignite when proper water level is
restored.
Test additional field-installed controls: If boiler has additional operating control or other controls, test for
operation as outlined by control manufacturer. Burner should be operating and should go off when controls
are tested. When controls are restored, burner should re-ignite.
Limit control set to system pressure requirements?
Thermostat heat anticipator setting (if available) set properly? Refer to “Connect wiring,” page 24.
Boiler cycled with thermostat? Raise to highest setting and verify boiler goes through normal start-up cycle.
Lower to lowest setting and verify boiler goes off.
32
Observed several operating cycles for proper operation?
Set room thermostat(s) to desired room temperature?
Completed Installation and Service Certificate (page 33)?
Reviewed Maintenance and Service Manual with owner or maintenance person and instructed person to keep
for future reference?
Returned all instructions provided with boiler to its envelope and placed with boiler for future reference?
Part number 550-141-829/1211
Page 33
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Installation and service certificate
Installation and service certificate
Date Installed: ____________________________
Boiler Model Number: _______ Series: ____________
CP Number(s): ___________________________
Measured Btu or GPH Input: ________________
Installer: ________________________________________________________________________________________________
(Company) (Address) (Phone)
_________________________________________
Installation instructions have been followed.
Check-out procedure has been performed.
Above information is certified to be correct.
Information received and left with owner/maintenance
person.
(Installer’s Signature)
Part number 550-141-829/1211
33
Page 34
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Annual service check list
Annual Service Call
Checklist
(follow in order listed below)
Check that boiler area is free from
1
combustible materials, gasoline and
other flammable vapors and liquids.
Check for and remove any obstruction
2
to combustion and ventilation air flow
to boiler.
Check breeching and chimney or vent
3
for obstructions, damage, etc. Repair
or replace as necessary.
Dates Comments
Clean boiler ueways. See page35.
4
Perform service on low water cuto,
relief valve and gauge glass. See
5
page36.
Check boiler and piping for leaks and
6
repair if found.
Inspect and adjust burner. See burner
manual and:
• change nozzle.
• check ignition electrode settings.
• clean blower housing and wheel.
7
• make sure blower wheel turns
freely.
• oil burner motor if required.
• clean air inlet.
• clean or change fuel lter and
strainer.
Make sure boiler is lled with water.
8
See page31.
Start unit and verify combustion
settings with combustion test
9
equipment. See page31.
Verify operation of all controls on
10
boiler. See page31.
Any parts of the boiler furnished by Weil-McLain must be replaced by parts listed in
34
Weil-McLain Boiler and Repair Parts Book.
Part number 550-141-829/1211
Page 35
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Detailed service procedures
Cleaning boiler flueways
Make sure all electrical connections to boiler are turned
off and wait until boiler is warm, not hot, before cleaning. Failure to do so will result in severe personal injury,
death or substantial property damage.
1. Top flue boilers -remove breeching and jacket top panel. Rear flue
boilers - remove jacket top panel.
2. Remove flue collector hood, saving hardware for reassembly.
3. Shut off oil valves. Arrange drip pans under the areas of oil piping
that will be disconnected. Disconnect oil line at burner so that you
can swing open the door completely.
4. Line combustion chamber floor with newspaper to catch any soot
that will be loosened in the cleaning process.
5. Starting at the top of the boiler, use a wire flue brush to thoroughly
clean between all pins at all angles. Be careful not to damage side
wall of rear refractory.
6. Move to the bottom of the flueways and clean up between the
sections to reach pins left uncleaned in step #5.
7. Once the flueways are cleaned, carefully remove the paper from
the floor of the combustion chamber.
8. Verify sealing rope around flue area is intact. Visually check condition and position of insulation in combustion chamber floor, and
the refractories at the rear of boiler and in the burner mounting
door. Replace any parts as necessary.
9. Close burner mounting door and tighten nut securely. Place flue
collector hood on top of boiler. Secure with hardware from step #2.
Figure 23 Thoroughly clean flueways between all pins
at all angles. Start on top of boiler, finish from
the bottom.
Maintain a gas-tight seal to avoid possible flue gas leak-
age and carbon monoxide emissions, which can lead to
severe personal injury or death.
10. Check breeching for sooting and clean if necessary. Install jacket
top panel and breeching.
11. Reconnect oil line and all electrical connections.
Part number 550-141-829/1211
35
Page 36
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Detailed service procedures (continued)
General description of control operation
Low water cutoff
Shuts down boiler if there is a low water condition.
Steam relief valve
Provides discharge if boiler pressure exceeds 15 psig.
Pressure limit control
If high steam pressure occurs, control shuts down burners until
pressure drops. Limit should be set higher than design pressure
of system. Operating control can be set at 5 psig and adjusted to
comfort level. Normal operation is usually less than 5 psig. At
certain times the system may operate under vacuum conditions.
Gauge glass
Indicates boiler water level. Cold fill water level should correspond to line stamped on boiler jacket. When boiler operates,
water level will fluctuate.
Pressure gauge
Provides reading of boiler pressure. Maximum boiler pressure
is 15 psig.
Tankless water heater
Weil-McLain tankless heater ratings are based on 200°F boiler
water temperature. To get rated output, set tankless heater control to 200°F. Control can be adjusted to meet system hot water
requirements.
Burner adjustments for packaged and
non-packaged boilers
Final burner adjustments must be made using
combustion test equipment to assure proper operation. Do not fire boiler without water or sections
will overheat.
1. Refer to burner manual for start-up.
2. Allow boiler to heat to design condition.
3. Using combustion test equipment, adjust burner for:
a. CO2 between 11% and 12% and 0 smoke.
b. -0.01” to -0.02” W.C. draft in combustion chamber.
Controls requiring annual service
Float-type low water cutoff
Follow instructions to blowdown cutoff on page 4. Also refer
to instructions from cutoff manufacturer in envelope assembly
provided with boiler.
Probe-type low water cutoff
Cutoff must be removed and inspected and cleaned annually.
Refer to cutoff manufacturer’s instructions in envelope assembly
provided with boiler.
Steam relief valve
Check operation of steam relief valve. Follow instructions on
label fastened to relief valve.
Scald potential. Do not check operation of relief
valve unless discharge piping has been installed according to Boiler Manual. If piping is not in place,
a qualified service technician must properly install
piping.
Gauge Glass
To clean glass:
1. Close lower gauge glass cock and carefully open petcock
below glass to blow water and sediment out of glass by steam
pressure.
2. Slowly open lower gauge glass cock and allow a small amount
of water to flush out through the open petcock.
3. Close petcock and fully open lower gauge cock. The water
level should immediately rise to its proper level.
4. If gauge glass breaks, close off both gauge cocks and loosen
glass retaining nuts to remove gauge glass. Do not use thin
glass tubing as a replacement.
36
Part number 550-141-829/1211
Page 37
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Handling ceramic fiber and fiberglass materials
REMOVAL OF COMBUSTION CHAMBER
LINING OR BASE PANELS
The combustion chamber lining or base
insulation panels in this product contain
ceramic fiber materials. Ceramic fibers
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 (Group 1).”:
Precautionary measures
Avoid breathing fiberglass dust and contact with
skin or eyes.
• Use NIOSH certified dust respirator (N95).
This type of respirator is based on the
OSHA requirements for fiberglass wool 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 web site at http://www.cdc.gov/
niosh/homepage.html. NIOSH approved respirators, manufacturers, and phone numbers
are also listed on this web site.
• Wear long-sleeved, loose fitting clothing,
gloves, and eye protection.
Apply enough water to the combustion chamber
lining or base insulation to prevent airborne dust.
Remove combustion chamber lining or base in-
sulation from the boiler and place it in a plastic
bag for disposal.
Wash potentially contaminated clothes separately
from other clothing. Rinse clothes washer thoroughly.
REMOVAL OF FIBERGLASS WOOL
or
INSTALLATION OF FIBERGLASS WOOL
OR BASE PANELS:
This product contains fiberglass jacket
insulation and ceramic fiber materials in
combustion chamber lining or base panels
in gas fired products. Airborne fibers from
these materials have been listed by the State
of California as a possible cause of cancer
through inhalation.
Precautionary measures
Avoid breathing fiberglass dust and contact with
skin or eyes.
• Use NIOSH certified dust respirator
(N95). This type of respirator is based
on the OSHA requirements for fiberglass
wool 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 web site at
http://www.cdc.gov/niosh/homepage.html.
NIOSH approved respirators, manufacturers, and phone numbers are also listed on
this web site.
• Wear long-sleeved, loose fitting clothing,
gloves, and eye protection.
Operations such as sawing, blowing, tear out, and
spraying may generate airborne fiber concentration requiring additional protection.
Wash potentially contaminated clothes separately
from other clothing. Rinse clothes washer thoroughly.
NIOSH stated First Aid
Eye: Irrigate immediately
Breathing: Fresh air
Part number 550-141-829/1211
NIOSH stated First Aid
Eye: Irrigate immediately
Breathing: Fresh air
37
Page 38
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Parts list
Table 7 Series 3 section and flue collector parts
Item Description Part No.
A Wide front section (7011) 316-700-245
Regular intermediate section
B
(7015)
Intermediate section w/draw rod
C
lugs (7016)
Back section w/7" flue, supply &
D
2" return (7027)
Section replacement kit (for
1 joint, includes seals, rope,
E
adhesive and collector hood
hardware) front or back section
Section replacement kit (for 2
joints, includes seals, rope and
adhesive) intermediate section
Section assembly complete, for
SGO-3 with jacket
Section assembly complete, for
SGO-4 with jacket
Section assembly complete, for
SGO-5 with jacket
Section assembly complete, for
SGO-6 with jacket
Section assembly complete, for
SGO-7 less jacket
Section assembly complete, for
SGO-8 less jacket
Section assembly complete, for
SGO-9 less jacket
F Collector hood kit for SGO-3* 386-700-340
F Collector hood kit for SGO-4* 386-700-341
F Collector hood kit for SGO-5* 386-700-342
F Collector hood kit for SGO-6* 386-700-343
F Collector hood kit for SGO-7* 450-020-191
F Collector hood kit for SGO-8* 450-020-192
F Collector hood kit for SGO-9* 450-020-193
G Tie rod ½ x 5½ (SGO-7, 8, 9) 560-234-464
316-700-065
316-700-070
316-700-227
386-700-852
386-700-851
386-700-665
386-700-666
386-700-667
386-700-668
386-700-669
386-700-670
386-700-671
Item Description Part No.
G Tie rod ½ x 12¼ (SGO-3) 560-234-493
G Tie rod ½ x 13 (SGO-7 & 8) 560-234-494
G Tie rod ½ x 14 (SGO-8, 9) 560-234-470
G Tie rod ½ x 15 (SGO-9) 560-234-495
G Tie rod ½ x 15 (SGO-4) 560-234-532
G Tie rod ½ x 16½ (SGO-9) 560-234-496
G Tie rod ½ x 18½ (SGO-5) 560-234-475
G Tie rod ½ x 21 (SGO-6) 560-234-536
G Tie rod ½ x 24¾ (SGO-7) 560-234-540
G Tie rod ½ x 28 (SGO-8) 560-234-544
G Tie rod ½ x 31 (SGO-9) 560-234-546
Heater cover plate carton (cover
H
plate, gasket, studs & nuts)
Combustion chamber kit (rear &
J
frt ref., Door refractory blanket,
rope, blanket & water glass)
Burner mounting door assembly
K
(door, obs. Port, rope, ins. And
pins)
L Door hinge (7054) 330-054-300
M Door refractory 386-700-359
N Door refractory blanket 591-222-115
P Observation port shutter 460-039-867
Q Door seal rope 5' 590-735-104
" Glass rope for collector hood
R
(7' for largest size hood)
Flue cap assembly (cap, strap,
S
rope and screws)
Flue brush (123D) 591-706-214
Blocked vent shutoff switch
(Canada only)
* Includes flue cap assembly, rope and hardware
for installation.
389-900-103
385-700-355
386-700-358
590-739-109
386-700-344
511-624-650
G Tie rod ½ x 10¾ (SGO-7) 560-234-491
38
Part number 550-141-829/1211
Page 39
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Parts drawing
Table 8 Series 3 section and flue collector parts
D
S
E
G
J
J
G
F
R
B
A
L
J
M
J
K
Repair parts must be purchased through Weil-McLain for the specific boiler as indicated in the list below. Results
from using modified or other manufactured parts will not be covered by warranty and may damage boiler or impair
operation.
Part number 550-141-829/1211
G
H
C
N
Q
P
39
Page 40
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Replacement parts
Table 9 Series 3 trim parts
Fig.
No.
1 560-640-698 Syphon, 180° Bend, ¼" brass pipe
2a
2b
3 510-218-045 Steam pressure gauge, 0-30 P.S.I.G. Ametek PSOSK
4 510-218-135 Gauge cock set, B15, standard stem Conbraco 20-205-03B15
5 383-600-001 Gauge glass kit, includes glass, gaskets and brass washers Weil-McLain
6 563-334-597 Water gauge glass guard, 10" long Weil-McLain
7 510-312-135
8 510-312-209
9 511-114-495 Low water cutoff, float type
10 511-100-007 Low water cutoff, probe type Hydrolevel 45-469-1560
11
12 510-512-267 Balanced draft damper (barometric) 7" Effikal ESOC
13 591-391-848 Junction box wiring harness assembly (A & B only) Weil-McLain
14 591-391-854 Junction box cover assembly with service switch Weil-McLain
15 591-391-850 Burner harness assembly Weil-McLain
16 591-391-837 SGO water harness Weil-McLain
17 510-311-024 Limit control without well, spdt (for tankless heater) Honeywell L6006A1251
18 591-391-842
19 591-391-965
20 426-700-268 (Not shown) Flue pipe brackets (requires 2 of this item) Weil-McLain
21 590-921-903
Part no. Description Mfr. Mfr. part no.
Steam relief valve, set to relieve at 15 P.S.I.G., ¾" N.P.T. inlet ¾" N.P.T.
511-548-023
511-210-423 Drain cock, ¾", 1½" shank Conbraco 31-606-01
511-246-392
side outlet, 300 lbs./hr steam capacity
Steam relief valve, set to relieve at 15 P.S.I.G., ¾" N.P.T. male inlet ¾"
N.P.T. female side outlet, 407 lbs./hr steam capacity
High pressure limit control, operating range 0.5-9 P.S.I., additive
differential 1-5 P.S.I.
High pressure limit control, operating range 0-15 P.S.I., differential 2-8
P.S.I.
High temperature limit control, spst, automatic recycle with ¾" well (used
in tankless heater kit)
High temperature limit control, spst, automatic recycle with ¾" well (used
in tankless heater kit)
Drain cock, ¾" Hammond 710
Drain cock, ¾" Watts BD2C
Drain cock, ¾" Matco-Norca
Drain cock, ¾" Nibco #74
Junction box-wiring harness assembly (S-GO float low water cutoff only
- packaged only)
Junction box-wiring harness assembly (S-GO probe low water cutoff only
- packaged only)
(Not shown) Tankless Heater - steam boiler, includes heater, gasket, nuts
and studs. For SGO-3 thru 9
Watts 315
Conbraco 13-511-08
Honeywell PA404A1009
Johnson
Controls
Honeywell L4080B131
White-Rogers 11B83-16
McDonnell-
Miller
Weil-McLain
Weil-McLain
Heat Transfer
Products
P-47AA-25D
67W-2
35-S-29
40
Part number 550-141-829/1211
Page 41
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Replacement parts (continued)
Figure 24 Series 3 trim parts
Repair parts must be purchased through Weil-McLain for the specific boiler as indicated in the list below. Results
from using modified or other manufactured parts will not be covered by warranty and may damage boiler or impair
operation.
Part number 550-141-829/1211
41
Page 42
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Replacement parts (continued)
Table 10 Boiler jacket
1 2 3
Model
SGO-3 381-355-521 381-355-596 381-355-522 381-355-523 426-700-252 381-355-524
SGO-4 381-355-521 381-355-596 381-355-525 381-355-526 426-700-254 381-355-527
SGO-5 381-355-521 381-355-596 381-355-528 381-355-529 426-700-256 381-355-530
SGO-6 381-355-521 381-355-596 381-355-531 381-355-532 426-700-258 381-355-533
Jacket panel with insulation —
front
UL Non-UL UL Non-UL
Left side and rear
Right side and
rear
Top panel with
cap
Complete Jacket cartons
UL Non-UL
7 section 416-700-182 416-700-183
8 section 416-700-184 416-700-185
9 section 416-700-186 416-700-187
Common jacket parts for all boilers
Plastic flue cap cover w/insulation 560-907-687
Jacket hardware kit 386-700-853
Touch up paint, gold spray can 592-000-000
42
Part number 550-141-829/1211
Page 43
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Replacement parts (continued)
Figure 25 Boiler jacket
Repair parts must be purchased through Weil-McLain for the specific boiler as indicated in the list below. Results
from using modified or other manufactured parts will not be covered by warranty and may damage boiler or impair
operation.
Part number 550-141-829/1211
43
Page 44
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Dimensions
Figure 26 SGO dimensions — inches (mm) — see Table 11, page 45
Steam supply
piping 6-9
7 DIA
[177.8]
3
7
/16 [182.6]
[393.7]
A
7 DIA
[177.8]
1
15
¼2
L
1
/4 [514.4]
1
4
/16 [103.2]
Steam supply
piping 3-9
20
73/4 [196.9]
3
/4 [95.3]
3
Steam
supply
Skim
tapping
101/4 [260.4]
355/8
[904.88]
B
267/8
[682.6]
Water
Line
4 DIA
[111.1]
burner
opening
301/16
[763.6]
1
9
/2 [241.3]
14 Approx.
1
[28.6]
SGO side with burner
SGO “A” front
7 DIA
[177.8]
6¼
[158.8]
R
7" DIA
[177.8]
299/16
[750.9]
44
Intermediate
SGO back
Part number 550-141-829/1211
Page 45
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Dimensions (continued)
Table 11 Dimensions
A B L
Boiler model
number
Inches mm. Inches mm. Inches mm.
SGO-3 — —
SGO-4 — —
SGO-5 — —
SGO-6 19 482.6
SGO-7 22 561.8
SGO-8 25¼ 641.4
SGO-9 28 720.9
13½
16
19
23½
26
29¼
32
342.9
422.1
504.9
584.2
663.4
742.9
822.4
16
20
22
26¼
29
32½
35
428.7
508.0
587.2
666.7
746.2
825.5
904.7
Part number 550-141-829/1211
45
Page 46
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Ratings
Table 12 SGO GOLD Oil steam boiler ratings
®
DOE
Seasonal
Efciency
%
AFUE
(4)
Net I=B=R
Ratings
Steam
sq. ft.
(5)
Steam
MBH
Boiler
Model
Number
*-SGO-3 0.95 114 354 85 83.8 8x8 6 15 7 10.7 .020
*-SGO-4 1.20 144 450 108 84.0 8x8 6 15 7 12.5 .010
*-SGO-5 1.45 174 546 131 83.9 8x8 7 15 7 14.2 .015
*-SGO-6 1.75 210 658 158 83.7 8x8 7 15 7 16 .015
**-SGO-7 2.00 240 750 180 83.6 8x8 8 15 7 17.7 .015
**-SGO-8 2.30 266
**-SGO-9 2.55 295 (6) 921 221 — 8x12 8 20 7 21.2 .030
I=B=R
Burner
Capacity
GPH
(3)
DOE
Heating
Capacity
MBH
(2)
(6) 833 200 — 8x12 8 20 7 19.4 .025
Minimum
I=B=R Chimney
RectInRoundInHeight
Ft
Round
Flue
Outlet
Size In
(7)
Steam
Boiler
Water
Content
Gal
(8)
Draft
Loss
Thru
Boiler
In
W.C.
(9)
* Substitute “P” for completely assembled packaged steam boiler without burner (SGO-3 through SGO-6 only).
Substitute “A” for boiler only for use with approved burners as listed with I-B=R.
** Available only as an “A” unit.
(1) SGO boiler designed with convertible vertical and horizontal ue outlet.
(2) MBH refers to thousands of Btu per hour.
(3) Based on 140,000 Btu/gal.
(4) Based on standard test procedures prescribed by the United States Department of Energy at combustion condition of 13.5% CO2
and -0.02” W.C. dra overre .
(5) Net I=B=R ratings are based on net installed radiation of sucient quantity for the requirements of the building and nothing
need be added for normal piping and pick-up. Steam ratings are based on a piping and pick-up allowance of 1.33. An additional
allowance should be made for unusual piping and pick-up loads. Consult local Weil-McLain Sales Oce.
(6) I=B=R gross output
(7) See page 12 for minimum breeching diameter.
(8) To water line.
(9) Listed dra losses are for factory-shipped settings.
46
Part number 550-141-829/1211
Page 47
GOLD
SGO
Notes
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Part number 550-141-829/1211
47
Page 48
GOLD
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 3 — Boiler Manual
Part number 550-141-829/1211
Loading...