Page 1
Oil-Fired Water 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. Perf orm steps in the order giv en. Failure to comply could result in severe personal
injury, death or substantial property damage.
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER 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 7 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 28 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 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER 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
Tips for water systems — . . . . . . . . . . . . . . .4
Routine maintenance schedule. . . . . . . . . . . . . .5
Beginning each heating season . . . . . . . . . . . .5
Daily during heating season . . . . . . . . . . . . . .5
Weekly during heating season . . . . . . . . . . . . .5
End of heating season . . . . . . . . . . . . . . . . .5
Boiler shutdown . . . . . . . . . . . . . . . . . . . .5
Operation. . . . . . . . . . . . . . . . . . . . . . . . . .6
WGO (see Figure 1) . . . . . . . . . . . . . . . . . .6
Troubleshooting . . . . . . . . . . . . . . . . . . . . . .7
Before installing boiler . . . . . . . . . . . . . . . . . .8
Installations must comply with . . . . . . . . . . . . .8
Before selecting boiler location. . . . . . . . . . . . .8
Provide clearances around boiler
(see Figure 2) . . . . . . . . . . . . . . . . . . . . .8
Provide air for combustion and ventilation . . . . . . .9
Foundation . . . . . . . . . . . . . . . . . . . . . . .9
Install boiler — packaged boilers only. . . . . . . . . 10
Place boiler. . . . . . . . . . . . . . . . . . . . . . 10
Perform hydrostatic pressure test . . . . . . . . . . 10
Install boiler — non-packaged boilers only . . . . . . 12
Place boiler. . . . . . . . . . . . . . . . . . . . . . 12
Perform hydrostatic pressure test . . . . . . . . . . 14
Install jacket
(sizes 7 through 9 only) . . . . . . . . . . . . . . . 14
Install boiler controls . . . . . . . . . . . . . . . . .14
Install burner — all boilers . . . . . . . . . . . . . . . 15
Install burner
(also refer to instructions packed with burner) . . . .15
Connect breeching . . . . . . . . . . . . . . . . . . . 16
General chimney requirements. . . . . . . . . . . . 16
Connect water piping . . . . . . . . . . . . . . . . . . 18
General piping information . . . . . . . . . . . . . .18
Install piping . . . . . . . . . . . . . . . . . . . . . 18
DIAPHRAGM expansion tank (Figure 9, page 19). . 18
CLOSED expansion tank (Figure 10, page 19) . . . 18
To connect WGO boilers to indirect-fired
water heaters. . . . . . . . . . . . . . . . . . . . . 18
Piping MULTIPLE ZONES . . . . . . . . . . . . . .20
Piping for systems requiring
temperatures below 140°F . . . . . . . . . . . . . .21
Use with refrigeration systems . . . . . . . . . . . . 22
Connect wiring. . . . . . . . . . . . . . . . . . . . . . 22
General wiring requirements . . . . . . . . . . . . . 22
Thermostat wiring . . . . . . . . . . . . . . . . . . 22
3-Wire zone valve applications. . . . . . . . . . . . 22
Junction box (furnished) . . . . . . . . . . . . . . .23
Burner wiring . . . . . . . . . . . . . . . . . . . . . 23
High temperature limit . . . . . . . . . . . . . . . . 23
Connect wiring — blocked vent
shutoff switch option . . . . . . . . . . . . . . . . . . 25
Blocked vent shutoff switch . . . . . . . . . . . . . 25
Connect oil piping . . . . . . . . . . . . . . . . . . . . 26
General oil piping requirements . . . . . . . . . . . 26
Oil piping connection at burner. . . . . . . . . . . . 26
Start-up. . . . . . . . . . . . . . . . . . . . . . . . . . 27
Fill the system . . . . . . . . . . . . . . . . . . . . 27
When using antifreeze . . . . . . . . . . . . . . . .27
To place in operation . . . . . . . . . . . . . . . . .27
Check-out procedure . . . . . . . . . . . . . . . . . . 28
Check off steps as completed . . . . . . . . . . . . 28
Installation and service certificate . . . . . . . . . .28
Annual service check list . . . . . . . . . . . . . . . . 29
Controls requiring annual service . . . . . . . . . . 29
Detailed service procedures . . . . . . . . . . . . . . 30
Cleaning boiler flueways . . . . . . . . . . . . . . .30
General description of control operation . . . . . . .30
Handling ceramic ber and berglass materials . . . 31
Close clearance installation . . . . . . . . . . . . . . 32
Close clearance installation . . . . . . . . . . . . . 32
Burner adjustments for packaged
and non-packaged boilers . . . . . . . . . . . . . .32
Replacement parts . . . . . . . . . . . . . . . . . . . 34
Dimensions . . . . . . . . . . . . . . . . . . . . . . . 40
Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER 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 page 1 through page 7 must
be followed to assure proper operation of your
boiler. See page 7 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 29 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.
Follow instructions below to prevent
severe personal injury, death or substantial property damage:
• Do not use crankcase drainings or any oil
containing gasoline. See burner manual for
proper fuel oil.
• Do not attempt to start burner when excess
oil has accumulated in combustion chamber,
when unit is full of vapor, or when combustion
chamber is very hot.
• Do not start burner unless collector hood, flue
cap, jacket cap, breeching and burner mounting door are secured in place.
• Never burn garbage or paper in the boiler.
Never leave combustible material around
boiler.
• DO NOT TAMPER WITH UNIT OR CONTROLS. Always follow specific instructions
when starting up boiler or performing routine
maintenance or service.
4
• 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.
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER 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.
End
of heating season
Boiler
shutdown
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.
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 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
Operation
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
WGO (see Figure 1)
1. If burner does not fire, check for:
• Service switch on boiler or additional switches turned off.
• Fuses or breaker switch tripped.
• Thermostat set below room temperature.
• Fuel valves turned off.
• Not enough oil in tank to supply burner.
Figure 1 WGO Boilers
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.
Burner must never be fired when oil is in combus-
tion chamber. Immediately call qualified service
technician.
3. If burner still does not fire, call qualified service technician.
1 Burner disconnect plug
2 Service switch on boiler
3 Water relief valve
4 Temperature-pressure gauge
5 Circulator
6 Limit control / low water
cut-off
7 Reset button on burner
primary control
8 Burner primary control
6
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER 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.
Black water condition.
Frequent release of water
through relief valve.
Metal flakes found in
flueway.
Some radiators or
baseboard units do not
heat or are noisy.
Thermostat installed where
Locate thermostat on inner wall away from heat sources or cool drafts.
drafts or heat affect reading.
Heat anticipator in thermostat adjusted incorrectly.
Adjust heat anticipator to match current draw. Refer to boiler wiring
diagram.
Incorrect limit setting. Have qualified service technician increase limit setting to decrease
cycling. Maximum setting 220° F.
Leaks in boiler or piping. Have qualified service technician repair leaks at once to avoid constant
use of makeup water.
Mineral deposits in sections
due to constant use of makeup water, or incorrect pH.
Oxygen corrosion due to
leaks in piping.
Expansion tank sized too
Have qualified service technician de-lime boiler, repair leaks at once
to avoid constant use of makeup water and check pH (between 7.0
and 8.5).
Have qualified service technician repair leaks at once to avoid constant
use of makeup water and check pH (between 7.0 and 8.5).
Have qualified service technician check expansion tank operation.
small or water-logged.
Contaminated combustion
air supply.
Condensation of combustion
Remove sources of hydrocarbons in or near boiler area. (Bleaches,
cleaners, chemicals, sprays, fabric softeners, paint remover, etc.)
Have qualified service technician check boiler operation.
gases.
Air in system. Bleed air from system through air vents in radiators or baseboard units.
Low system pressure. Have qualified service technician check for leaks in boiler or piping
at once.
High limit set too low. Have qualified service technician adjust limit to higher setting.
Domestic water from
tankless heater is hot then
suddenly turns cold.
OR
Domestic water from
tankless heater is always
lukewarm.
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 flow rate too high. Have qualified service technician install flow check valve set to rating
Incorrect setting on tankless
heater control.
Part number 550-141-826/1014
Have qualified service technician delime or replace coil.
Have qualified service technician remove and clean coil and drain,
and flush boiler to remove stop-leak.
Have qualified service technician adjust mixing valve setting.
of tankless heater.
Have qualified service technician raise tankless control setting. Adjust
differential on tankless control to lower setting.
7
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OIL-FIRED NATURAL DRAFT WATER 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 7 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 9.
• Oil supply. See page 26 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 2 Recommended service clearances
Provide clearances around boiler
(see Figure 2)
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
• 12 inches — Right side for burner door
swing radius
• Special close clearances (alcove, closet, under counters, etc.) — see Appendix, page 32.
A
A
A
Top View
A Provide 6" minimum clearance for service, provide 12"
minimum clearance for burner door swing.
B Minimum clearance from vent pipe to combustible mate-
rial: 6" for type “L” double-wall vent, 9" for single-wall
vent.
8
24"
Walls
B
Wall
B
Ceiling
B
24"
Floor
Left side
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER 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 weatherstripped, 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
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.).
Permanent Openings
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.
Inside air
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 fuelburning appliances plus requirements for any equipment that can pull air from room (including clothes
dryer and fireplace).
Outside air
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 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 crosssectional 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.
Foundation
Lay a foundation, if needed. Boiler may be installed
on non-carpeted combustible flooring. Solid concrete
blocks can be used to create a pad.
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.
Table 1 Boiler foundation sizes
Boiler
model
WGO-2
WGO-3
WGO-4
WGO-5
WGO-6
WGO-7
WGO-8
WGO-9
Length
inches
14 22 2
17 22 2
17 22 2
20 22 2
23 22 2
26 22 2
29 22 2
32 22 2
Width
inches
Installation instructions:
Packaged boiler — Continued on page 10
Non-packaged boiler — Continued on page 12
Min.
height
inches
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install boiler — packaged boilers only
Place boiler
1. Remove circulator strapped to pallet.
Circulator will be damaged if not removed before boiler is
lifted from pallet.
2. 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.
3. Boiler is shipped for back flue outlet. To change to top flue outlet (see
Figure 3, page 11):
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
d. Loosen two screws on back flue outlet. Set flue cap on outlet. Install
e. Snap jacket cap in back outlet opening.
4. Check level. Shim legs, if needed.
5. Check for secure placement of insulation on target wall, chamber floor
and burner door.
6. Visually check:
a. Flue collector hood seal.
b. Burner mounting door seal.
under step #6 below).
strap by engaging slots in screws. Tighten screws. Make sure cap is
securely installed.
Jacket cap must be in place on boiler to avoid requiring an 18”
minimum clearance from back or top of boiler to combustible
material.
Obtain gas-tight seal to prevent possible flue gas leakage
and carbon monoxide emissions, which can lead to severe
personal injury or death.
Perform hydrostatic pressure test
1. Remove relief valve installed in boiler.
2. Install air vent in “N” tapping on top boiler.
3. Plug supply and return tappings.
4. Drain valve is already factory-installed.
5. Fill boiler. Vent all air. Pressure test boiler at 1½
times working pressure.
Do not leave boiler unattended. Cold
water fill can expand and damage cast
iron, resulting in severe personal injury,
death or substantial property damage.
6. Check for maintained gauge pressure for more
than 10 minutes. Visually check for leaks if gauge
pressure drops.
7. Drain boiler. Repair leaks if found.
Do not use petroleum-based sealing
compounds to repair leaks. Damage to
system components can result, causing
property damage.
8. Retest boiler after repairing leaks.
9. Remove air vent and plugs. Reinstall relief valve.
10
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install boiler — packaged boilers only (continued)
Figure 3 Change from back flue outlet to top flue outlet (optional)
Instructions for packaged boilers continued on page 15.
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install boiler — non-packaged boilers only
Fiberglass wool and ceramic fiber ma-
terials are possible cancer hazards. See
warning on page 31.
Place boiler
Non-Packaged WGO-2 through 6 —
position on site
Smaller sized boilers may be top heavy.
Use caution when handling to avoid minor personal injury or property damage.
Boiler is shipped for back flue outlet. To change to top
flue outlet (see Figure 3):
1. Loosen two screws holding flue cap strap to collector hood. Remove strap and flue cap from opening.
Re-tighten screws.
2. Check rope placement inside flue cap.
(Read
3. 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.
under Step #3 on page 13.)
Non-Packaged WGO-7, 8 & 9 — split the assembled
block for easier handling (see Figure 4, page 13)
1. Open burner mounting door and, using utility knife, slit floor insulation at joint to be separated.
2. 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.
3. Move divided block to location.
4. Clean port openings with clean rag.
Do not use petroleum-based compounds to clean openings.
Damage to system components can result, causing property
damage.
5. Place rings in port openings. If ring slips out of groove, stretch ring
gently for several seconds, then place in groove.
6. Position sections so aligning lugs fit into sockets of next section. Make
sure sealing rope is in good condition and in position.
7. Oil threads on draw rods. Install washer and nut on end to be tightened.
Use nut only on other end.
8. 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.
9. 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.
10. Metal-to-metal contact should be made around port openings. If gap
does exist, it should be less than .020". Check with feeler gauge.
11. 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.
12
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install boiler — non-packaged boilers only (continued)
Non-Packaged WGO-7, 8 & 9 — install flue
collector hood
Obtain gas-tight seal to prevent possible flue gas
1. Thread Tinnerman clip on screw so that clip fits snugly in
notch of hold-down lug. Screw must not turn.
2. 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.
3. Position flue collector hood on top of boiler sections and
over screws and clips as shown in Figure 4.
Figure 4 Change from back flue outlet to top flue outlet (optional)
Tinnerman
(see Figure 4)
leakage and carbon monoxide emissions, leading
to severe personal injury or death.
Nut
Washer
clip
Screw
Hold-down
lug
Sealing
rope in
groove
inside cap
4. Install washers and nuts. Tighten nuts until collector hood
makes contact with Tinnerman clip.
5. 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.
6. Check level. Shim legs, if needed.
Flue
collector
hood
Sealing
rope with
adhesive
tape
Flue cap
strap
Part number 550-141-826/1014
Flue
cap
Separate
block here
for easier
handling
13
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install boiler — non-packaged boilers only (continued)
Perform hydrostatic pressure test
1. See Figure 5 and Control Tapping table to install:
a. Boiler drain.
b. Water pressure gauge (test only). Be sure gauge can
handle test pressure.
c. Air vent in upper “N” tapping.
d. Plugs in remaining tappings.
2. Fill boiler. Vent all air. Pressure test boiler at 1 times working pressure. For boilers split and reassembled, test between
75 and 85 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.
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 Table and Figure 5 and Figure 6, page 15
to install controls.
1. Install limit control. If not furnished, use high limit with
maximum 220°F setting.
2. Affix CP number label(s) on jacket front panel.
Table 2 Control tappings
Location Size Function
B1 1½" Return piping
B2 1½"
C 1½" Supply piping
E3
H ¾" Drain valve
L ¾" High limit control
N ½"
R1 ¾" Relief valve
1/4"
Alternate return piping for
A/B WGO
Pressure-temperature
gauge
Air vent or expansion
tank piping
Figure 5 Control tapping locations
R1
N
E3
B1
Front section
H
C
L
B2
Back section
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OIL-FIRED NATURAL DRAFT WATER 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.
Figure 6 Water boiler controls
Circulator
Relief
valve
For P-WGO and A-WGO 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° tilt downward. 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 with nut.
Water
pressure-temperature
gauge
Limit control / low water cut-off
Drain valve
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect breeching
General chimney requirements
• Designed for natural draft firing. Connect boiler to vertical chimney.
• Insufficient draft can cause flue gas leakage and carbon monoxide
emissions, which will lead to severe personal injury or death.
• Use vent material approved by local codes for oil-fired burners. In their
absence, refer to:
• NFPA 31, Installation of Oil-Burning Equipment.
• 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.
• 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.
Table 3 Minimum chimney sizes
Boiler
model
number
WGO-2
WGO-3
WGO-4
WGO-5
WGO-7
WGO-8
WGO-9
Note 1 6¾" x 6¾" inside liner
Note 2 6½" x 10½" inside liner
Minimum
breeching
diameter
(note 3)
5"
6"
6"
7"
7"
Minimum
AHRI
chimney size
Rect. Round
8" x 8"
(note 1) 6" 15'
8" x 8"
(note 1) 7" 15'WGO-6
8" x 12"
(note 2)
Minimum
chimney
height
7" 20'
Oversized chimneys, outside masonry chimneys and/or
derated inputs can result in condensation in chimney.
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 7, page 17.
• Top outlet — see Figure 8, page 17.
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.
Note 3 Flue collar on boiler is 7" diameter
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.
16
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect breeching (continued)
Figure 7 Back outlet breeching connection
Typical location for
barometric control
(Also see control
manufacturer’s
instructions)
Figure 8 Top outlet breeching connection
Flue pipe
bracket
(One on each
side of pipe)
Typical location for barometric
control
(Also see control manufacturer’s
instructions)
Flue pipe bracket
(One on each side of pipe)
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect water piping
General piping information
• All packaged WGO boilers are shipped with an installed
combination temperature limit control/low water cut-off.
• If installation is to comply with ASME or Canadian
requirements, an additional high temperature limit is
needed. Install control in supply piping between boiler
and isolation valve. Set control to a minimum of 20°F
above set point of combination control. Maximum allowable set point is 220°F. Wire control as shown on
wiring diagram.
• Use backflow check valve in cold water supply as required
by local codes.
Install piping
• See Figure 9 or Figure 10, page 19, and Table 4, page 18
for near-boiler piping and single-zone piping. See page 20
to complete multiple-zone piping or page 21 to complete
piping for systems operating below 140°F.
• For multiple-boiler piping, refer to Weil-McLain’s “Primary/Secondary Piping Guide” and “M-WGO Multiple
Boiler Manual.”
• Install relief valve vertically in “R1” tapping on front
of boiler. See Figure 9 or Figure 10 and also refer to tag
attached to relief valve for manufacturer’s instructions.
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.
CLOSED expansion tank
(Figure 10, page 19)
• Ensure expansion tank size will handle boiler and
system water volume and temperature.
Undersized expansion tanks cause system
water to be lost from relief valve and
makeup water added through fill valve.
Eventual section failure can result.
• Connect tank from “N” tapping shown in Figure
9 to expansion tank. Use ½" N.P.T. piping. Pitch
any horizontal piping up towards tank 1 inch per
5 feet of piping.
To connect WGO boilers to
indirect-fired water heaters
Install and wire per water heater manual provided with
water heater.
Table 4 Water piping sizes
Boiler model
number
WGO-2 1" 1"
To system From system
DIAPHRAGM expansion tank
(Figure 9, page 19)
• Make sure expansion tank size will handle boiler and
system water volume and temperature. Tank must be
located near boiler before inlet to circulator. See tank
manufacturer’s instructions for details.
• Undersized expansion tanks cause system water to be lost
from relief valve and makeup water added through fill
valve. Eventual section failure can result.
• Install automatic air vent in “N” tapping as shown in
Figure 9.
WGO-3 1¼" 1¼"
WGO-4 1¼" 1¼"
WGO-5 1½" 1½"
WGO-6 1½" 1½"
WGO-7 1½" 1½"
WGO-8 2" 2"
WGO-9 2" 2"
* All piping sizes based on 20°F
temperature rise through boiler.
18
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect water piping (continued)
Figure 9 Piping with DIAPHRAGM expansion tank
Circulator
Automatic
air vent
From
Isolation
valve
Cold water
fill
To diaphragm
expansion tank
and fittings
Circulator
(Alternate circulator location)
system
Isolation
valve
To system
“C” tapping
“N” tapping
Relief
valve
“B1” tapping
Figure 10 Piping with CLOSED expansion tank
Circulator
From
system
Isolation
valve
(Alternate circulator location)
Circulator
“B1” tapping
Closed type expansion tank
Cold water fill
Isolation valve
To system
“C” tapping
“N” tapping
Relief
valve
Part number 550-141-826/1014
19
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect water piping (continued)
Piping MULTIPLE ZONES
1. Follow instructions on page 18 and page 19 to
install piping near boiler.
2. See Figure 11 or Figure 12 to complete installation
3. Zoning with circulators:
a. Size each circulator to individual circuit re-
quirements.
b. Remove circulator (when furnished as standard
equipment).
c. Install balancing valves to adjust flow to distrib-
ute heat to all zones.
d. Separate relay is required for each circulator.
4. Zoning with zone valves:
a. Install balancing valves to adjust flow to distrib-
ute heat to all zones.
b. Separate transformer is required to power zone
valves. Refer to “Weil-McLain Zone Valve Wiring Guide” for details.
Figure 11 Multiple zoning with CIRCULATORS
Zone 2
Zone 1
1
2
1
5
1
2
3
1
5
Legend
1 Isolation valve
2 Flow control valve
3 Circulator
4 Zone valve
5 Drain valve
Figure 12 Multiple zoning with ZONE VALVES
Zone 2
Zone 1
1
5
1
1
1
4
5
20
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect water piping (continued)
Piping for systems requiring
temperatures below 140°F
In most systems, this type of piping is not required. If
system water temperature requirements are less than
140°F, such as radiant panels or converted gravity systems, use piping as shown in Figure 13 or Figure 14. If
system piping is plastic without an oxygen barrier, a
heat exchanger must be used.
Figure 13 Piping with CIRCULATORS
Legend
1 Isolation valve
2 Flow control valve
3 Circulator
4 System temperature
gauge
5 Zone valve
6 Drain valve
7 System temperature
valves
Adjust valves so that:
- the temperature at
gauge 8 is at least 140°F
- the temperature at
gauge 9 is at least 160°F
8 Blend temperature
gauge
9 Boiler temperature
gauge
Figure 14 Piping with ZONE VALVES
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect water piping
(continued)
Use with refrigeration systems
• Install boiler so that chilled medium is piped in
parallel with heating boiler. Use appropriate valves
to prevent chilled medium from entering boiler.
Consult AHRI Installation and Piping Guides.
• If boiler is connected to heating coils located in
air handling units where they can be exposed to
refrigerated air, use flow control valves or other
automatic means to prevent gravity circulation
during cooling cycle.
Figure 15 Use with refrigeration system
1
Supply
1
Circ.
Chiller
Strainer
Exp. tank
Circ.
Connect wiring
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, latest edition and
any additional national, state or local codes.
• In Canada, CSA C22.1 Canadian Electrical Code Part 1 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.
Exp. tank
1 Isolation valve 2 Balancing valve
1
1
2
Zone Valve Wiring
DO NOT connect directly from 3-wire zone valves
to the T-T terminals on the boiler
zone valves, install an isolation relay. Connect the zone
valve end switch wires to the isolation relay coil. Connect
the isolation relay contact across the boiler T-T terminals. Failure to comply can result in damage to boiler
components or cause unreliable operation, resulting in
possible severe property damage.
4- wire zone valves may be connected directly to the boiler control.
. When using 3-wire
22
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect wiring (continued)
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 water
trim carton) on the burner housing as shown in
Figure 16. 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 24.
Figure 16 Boiler wiring for forced hot water
Limit control
wiring harness
Service
switch
on
boiler
Burner
wiring
harness
Circulator
wiring
harness
(not
furnished
on “A”
boilers)
Part number 550-141-826/1014
Burner
disconnect plug
23
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect wiring (continued)
Figure 17 Wiring diagram
24
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect wiring —
blocked vent shutoff switch option
Blocked vent shutoff switch
In Canada, blocked vent shutoff switch kit
(see parts list page 34) must be installed.
See Figure 18. The wiring diagram in
Figure 19 shows boiler wiring only up
to the burner disconnect. For additional
information, refer to manufacturer’s
instructions.
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 18).
c. Install both the fork ends to the screw terminals on the BVSS Switch
as per the wiring diagram, (see Figure 19).
d. Replace BVSS box cover.
e. Locate Combination Control, remove cover, and disconnect red
wire from “B1” terminal.
f. If red wire from Step “e” has uninsulated female end, replace it
with insulated female end as supplied in kit.
g. Connect female end of Spill Switch BVSS Harness (blue wire) to
“B1” terminal.
h. Connect male end of Spill Switch BVSS Harness to the red wire
removed in Step “e”.
i. Replace Combination Control Cover.
3. Turn on power and verify safe operation of the appliance.
4. Restore boiler to normal operation.
Figure 18 Blocked vent shutoff switch installation Figure 19 BVSS wiring diagram
120 vac
field wiring
Low voltage
field wiring
120 vac
factory wiring
Low voltage
factory wiring
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER 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 be used 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.
Figure 20 Recommended oil piping connection to burner
Do not use Teflon tape as an oil pipe
sealant. It can cause valves to fail, creating
hazards. Do not use compression fittings.
• Underground pipe must be run in a casing to prevent oil leaking into ground or under floor. Check
local codes for information.
Oil piping connection at burner
See Figure 20 for recommended connection at burner,
allowing burner mounting door to swing open completely for servicing.
See local codes for
appropriate arrangement and
piping of filter control valves,
etc., back to oil tank
26
Flare fitting
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Start-up
OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Fill the system
1. Close manual and automatic air vents and boiler
drain cock.
2. Fill to correct system pressure. Correct pressure will
vary with each installation. Normal cold water fill
pressure for residential systems is 12 psig. Boiler
water pH 7.0 to 8.5 is recommended.
Failure to maintain recommended pH
level can cause section failure and leaks.
3. Open automatic air vent one turn.
4. Open other vents.
a. Starting on the lowest floor, open air vents one
at a time until water squirts out. Close vent.
b. Repeat with remaining vents.
5. Refill to correct pressure.
When using antifreeze
Do not use automotive, ethylene glycol,
undiluted or petroleum-based antifreeze.
Severe personal injury, death or substantial property damage can result.
• Use antifreeze especially made for hydronic systems.
Inhibited propylene glycol is recommended.
• 50% solution provides protection to about -30°F.
Do not exceed 50% mixture.
• Local codes may require back-flow preventer or
actual disconnect from city water supply.
• Determine quantity according to system water content. Boiler water content is listed on back cover of
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.
To place in operation
1. Verify boiler is filled with water.
2. Open burner mounting door and verify rear target wall, floor and burner door insulations are in
proper position.
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 Appendix,
page 32.
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. Vent air from system. Repeat steps 4 and 5 under
“Fill the system.” Air in system can interfere with
water circulation and cause improper heat distribution.
6. Check boiler and system piping for leaks. See “Tips
for water systems” on page 4.
7. Inspect breeching and venting for proper operation.
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Check-out procedure
Check off steps as completed
Boiler and heat distribution units filled with water?
Automatic air vent, if used, opened one full turn?
Air purged from system? Piping checked for leaks?
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 limit control: While burner is operating, move indica-
tor on limit control below actual boiler water temperature.
Burner should go off while circulator continues to operate.
Raise setting on limit control above water temperature and
burner should re-ignite.
operation as outlined by the 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 temperature requirements (max.
220°F)?
For multiple zones, flow adjusted to distribute heat in all
zones?
Thermostat heat anticipator setting (if available) set properly?
Refer to “Connect wiring,” page 22.
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.
Observed several operating cycles for proper operation?
Set room thermostat(s) to desired room temperature?
Completed Installation and Service Certificate below?
Reviewed pages 1–7 with owner or maintenance person and
instructed person to keep for future reference?
Test additional field-installed controls: If boiler has a low
water cutoff, additional high limit or other controls, test
Installation and service certificate
Date Installed: ____________________________
Boiler Model Number: _______ Series: ____________
CP Number(s): ___________________________
Measured Btu or GPH Input: ________________
Installer: ________________________________________________________________________________________________
(Company) (Address) (Phone)
_________________________________________
Returned all instructions provided with boiler to its envelope
and placed with boiler for future reference?
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)
28
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER 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
combustible materials, gasoline and
1
other flammable vapors and liquids.
Check for and remove any obstruction
to combustion and ventilation air flow
2
to boiler.
Check breeching and chimney or vent
for obstructions, damage, etc. Repair
3
or replace as necessary.
Clean boiler flueways. See Figure 21, page 30.
4
Dates Comments
Perform service on relief valve and
5
circulator. See page 30.
Check boiler and piping for leaks and
repair if found. Check for leaks at
tankless heater plate. Tighten nuts only
6
if leaks are found (for WGO torque to
20-25 ft.lbs.).
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 filter and
strainer.
Make sure boiler is filled with water.
8
Start unit and verify combustion settings with combustion test equipment.
9
See page 28.
Verify operation of all controls on
10
boiler. See page 28.
Any parts of the boiler furnished by Weil-McLain must be replaced by parts listed in Weil-McLain Boiler and Repair Parts Book.
Water Relief Valve
Check operation of water relief valve.
Follow instructions on label fastened to
relief valve.
Part number 550-141-826/1014
Controls requiring annual service
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.
Circulator
Follow oil-lubricating instructions on circulator. Over-oiling will damage circulator.
Water-lubricated circulators do not need
oiling.
29
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OIL-FIRED NATURAL DRAFT WATER 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
walls 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 21 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.
General description of control operation
Automatic air vent
Air is released when cap is unscrewed one turn. If air vent leaks, remove small cap on top of vent, push in stem of valve and then release
to clean valve seat. Screw cap completely on, then unscrew one turn.
Temperature limit control
If high boiler water temperature occurs, control shuts down burner, but
allows circulator to run as long as there is a call for heat. Limit should
be set higher than temperature needed for the system.
Maximum limit setting is 220°F.
Water relief valve
Provides discharge if boiler pressure exceeds 30 psig.
Circulator
Circulator provides forced water circulation through boiler
and piping system.
Pressure-temperature gauge
Provides reading of boiler pressure and temperature. Maximum boiler pressure is 50 psig, maximum water temperature is 220°F. Temperature will vary according to system
and daily heating demands. The range will be from room
temperature up to limit control setting.
30
Part number 550-141-826/1014
Page 31
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OIL-FIRED NATURAL DRAFT WATER 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 550-141-826/1014
NIOSH stated First Aid
Eye: Irrigate immediately
Breathing: Fresh air
31
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Close clearance installation
To provide close clearances as described on pages 26 and 27:
Obtain the Close Clearance Kit, Weil-McLain Part No. 386-500-050. Install the kit as described below. Failure to use
kit or install as described can result in a fire hazard, causing severe personal injury, death or substantial property
damage.
Close clearance installation
Substitute these instructions for corresponding material in
manual. All other procedures and practices must remain the same.
Recommended service and minimum clearances shown on
page 8 should be used where possible. Where closer clearances
are required:
• Top of boiler — If less than 24" available, provide removable
surface to allow for cleaning boiler flueways.
• Right or left side — Minimum 2 inches.
• Front — Minimum 2 inches from burner.
• Double-wall flue pipe to combustible surface — as listed in
Table 5, page 33 and Figure 24 through Figure 26, page 33.
Jacket cap must be in place on boiler to avoid requir-
ing an 9" minimum clearance from back or top of
boiler to combustible material. Flue pipe clearances
must take precedence over jacket clearances.
1. Install boiler using clearances described at left.
2. Install barometric control 18-20 inches from boiler in
breeching.
3. Attach manual reset temperature switch near upper surface
of enclosed area. See Figure 22.
4. Wire switch in series with thermostat. See Figure 23.
5. Provide two combustion/ventilation openings when installing in confined space. Size opening 140 sq. in. (1000 Btu)
per 1 GPH input. Locate openings near top and bottom of
enclosed space.
Burner adjustments for packaged and
non-packaged boilers
Final burner adjustments must be made using com-
bustion 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. Burner should be adjusted to 13% CO
level of zero and over-fire of -0.01” to -0.02”. Re-adjust burner
combustion to account for environmental conditions. Actual
CO2 value will vary and should be adjusted for clean and safe
combustion operation. Seasonal variations as well as suf-
ficient combustion air supply can affect proper combustion
and boiler performance. The burner should only be adjusted
by a service professional with appropriate instrumentation.
or less with a smoke
2
Figure 22 Manual reset temperature switch location
Combustible surface
1 to 5
inches
Manual reset
temperature
switch
Area above boiler
Bracket
#10 X ½" Phillips
sheet metal screw
32
#6 X ½" Phillips
Sheet metal
screw
Figure 23 Manual reset temperature switch wiring
Manual reset
temperature switch
44156
Thermostat
Part number 550-141-826/1014
Page 33
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Close clearance installation (continued)
Figure 24 Flue pipe clearances Figure 25 Back vent clearances
Combustible surface
A
Protection
Type “L” double-wall
vent piping
Type “L”
double-wall
vent pipe
6"
6"
Table 5 Protection required for clearances
less than 6 inches from doublewall
vent pipe*
Dimension A
When desired minimum
clearance from
Type “L” double-wall
vent pipe to combustible
surface is:
3"
2"
3"
Use the following
protection**:
½” thick insulation board
***
over one-inch glass fiber
or mineral wool batts+
24 gauge sheet metal with
one-inch ventilated air
space
½” thick insulation board
***
with one-inch ventilated air
space
24" For servicing
or min. 2" For close
clearances
Combustible
surface
2"
Note: 2" min. on sides
Figure 26 Top vent clearances
A
A
Combustible
surface
A
A
Combustible
surface
24" For
servicing
or min. 2"
For close
clearances
* All clearances measured from outer surface of
equipment to combustible surface, not to the
protection used.
** Apply to combustible surface unless otherwise
noted. Cover all surfaces as specified in Table and
Figure 24. Thicknesses are minimum.
*** Factory-fabricated board made of non-
combustible materials, normally fibers, having
thermal conductivity in range of one (Btu-inch)/
(hr./sq. ft./°F) or less.
+ Mineral wool batts (blanket or board), having min.
density of 8 lb/ft3 and a min. melting point of
1500°F.
Other dimensions available. Refer to NFPA-31.
Part number 550-141-826/1014
2"
2"
Combustible
surface
Note: 2" min. on sides
33
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Replacement parts
Table 6 Series 3 section and flue collector parts
Item Description Part no.
A Regular front section 7022 316-700-215
Wide intermediate section
B
(WGO-3) 7010
Narrow intermediate section
B
7015
Intermediate section w/draw rod
C
lugs 7016
Back section w/7" flue, supply &
D
2" return 7027
316-700-075
316-700-065
316-700-070
316-700-235
Section replacement kit
(for 1 joint, includes seals, rope,
E
adhesive and collector hood
386-700-852
hardware) front or back section
Section replacement kit
(for 2 joints, includes seals, rope
and adhesive)
386-700-851
intermediate section
Section assembly complete, for
WGO-2
Section assembly complete, for
WGO-3
Section assembly complete, for
WGO-4
Section assembly complete, for
WGO-5
Section assembly complete, for
WGO-6
Section assembly complete, for
WGO-7
Section assembly complete, for
WGO-8
Section assembly complete, for
WGO-9
386-700-650
386-700-651
386-700-652
386-700-653
386-700-654
386-700-655
386-700-656
386-700-657
F Collector hood kit for WGO-2* 386-700-336
F Collector hood kit for WGO-3* 386-700-337
F Collector hood kit for WGO-4* 386-700-337
F Collector hood kit for WGO-5* 386-700-338
F Collector hood kit for WGO-6* 386-700-339
Item Description Part no.
F Collector hood kit for WGO-7* 450-020-188
F Collector hood kit for WGO-8* 450-020-189
F Collector hood kit for WGO-9* 450-020-190
G Tie rod
1/2 x 51/2 (WGO-7, 8, 9) 560-234-464
G Tie rod 1/2 x 103/4 (WGO-2 & 7) 560-234-491
G Tie rod
1/2 x 12 (WGO-7) 560-234-492
G Tie rod 1/2 x 14 (WGO-3, 4, 8, 9) 560-234-470
G Tie rod
G Tie rod
1/2 x 15 (WGO-9) 560-234-495
1/2 x 17 (WGO-5) 560-234-472
G Tie rod 1/2 x 20 (WGO-6) 560-234-534
G Tie rod
G Tie rod
1/2 x 231/4 (WGO-7) 560-234-538
1/2 x 263/8 (WGO-8) 560-234-542
G Tie rod 1/2 x 291/2 (WGO-9) 560-234-497
Combustion chamber kit (rear & frt.
H
ref., door ref. blanket, rope, blanket
386-700-355
& water glass)
Burner mounting door assembly
(door, obs. port, rope, ins. & pins)
386-700-358
J Burner mounting door 7070 330-054-302
K Door hinge 7054 330-054-300
L Door refractory 386-700-359
M Door refractory blanket 591-222-115
N Observation port shutter 460-039-867
P Door seal rope 5' 590-735-104
3/8" Glass rope for collector hood
Q
(7' for largest size hood)
Flue cap assembly
R
(cap, strap, rope & screws)
590-735-109
386-700-344
Flue brush 123D 591-706-214
Blocked vent shutoff switch
(Canada only)
* Includes flue cap assembly, rope and hardware for
installation.
511-624-650
34
Part number 550-141-826/1014
Page 35
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Replacement parts (continued)
Figure 27 Parts drawing
D
E
R
F
Q
G
H
G
G
C
B
A
K
H
H
H
J
N
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 550-141-826/1014
L
M
P
35
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Replacement parts (continued)
Table 7 Series 3 trim parts
Fig.
No.
Combination pressure-temperature gauge kit, 60° – 360° F., 0 - 75
1
psi, 3
1/8" dia., 1/4" NPT, short shank, with 1/4" x 1/2" reducing bushing
ASME pressure relief valve, set to relieve at 30 PSIG,
2
3/4" female outlet
Electronic aquastat, high limit or combination high/low limit, with
3
LWCO, high limit 100°– 220°, low limit 110°- 200°, circulator amps:
5.8 FLA, anticipator: 0.2 amps
Drain cock,
Drain cock,
4
Drain cock,
Drain cock,
Drain cock,
5 Circulator, 1/25 HP, 120/60/1 motor, 175 RPM, 0.75 amps Taco W007F 511-405-113
Circulator universal hardware kit 1
Gasket, (2) Screws and (2) nuts) for sizes 2, 3 & 4 only
6
Circulator universal hardware kit 1
Gasket, (2) Screws and (2) nuts) for sizes 5 & 6 only
7
3/4" NPT well, 4.25" long Hydrolevel 592-300-026
8 Junction box - wiring harness assembly (series 1 A & B only) Weil-McLain 591-391-846
9 Junction box - wiring harness assembly (series 1 only - large pump) Weil-McLain 591-391-856
10 Junction box - wiring harness assembly (series 2 & 3 packaged only) Weil-McLain 591-391-836
(Not shown) Junction box - wiring harness assembly (series 2 & 3 A
11
& B only)
12 Junction box cover assembly with service switch Weil-McLain 591-391-854
13 Burner harness assembly Weil-McLain 591-391-850
14 Barometric damper Weil-McLain 510-512-267
15 Flue pipe brackets (set of 2) (Not shown) Weil-McLain 426-700-268
Vent damper kits
Boilers specication of 87% AFUE), with reduced rates only
WGO-2RD (Optional equipment)
WGO-3RD (Optional equipment)
16
WGO-4RD (Optional equipment)
WGO-5RD (Optional equipment)
WGO-6RD (Optional equipment)
WGO-7RD (Optional equipment)
3/4", 11/2" shank Conbraco 31-606-01 511-210-423
3/4" Hammond 710
3/4" Watts BD2C
3/4" Matco-Norca
3/4" Nibco #74
- Required for ENERGY STAR® compliance, (Version 3.0
Description Mfr. Mfr. part no. Part no.
Weil-McLain 380-000-000
3/4" male inlet,
1/4" (Includes: (1) Flange, (1)
1/2" (Includes: (1) Flange, (1)
Conbraco M330 511-546-920
Hydrolevel 3250 381-300-000
511-246-392
Weil-McLain 381-354-526
Weil-McLain 381-354-531
Weil-McLain 591-391-837
Field Controls
Weil-McLain
OVD-7
381-800-501
381-800-502
381-800-503
381-800-504
381-800-505
381-800-506
36
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Replacement parts (continued)
Figure 28 Series 3 trim
16
Part number 550-141-826/1014
37
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Replacement parts (continued)
Table 8 Weil-McLain part numbers
1 2 3
Model
WGO-2 381-355-494 381-355-593 381-355-495 381-355-496 426-700-250 381-355-497
WGO-3 381-355-494 381-355-593 381-355-498 381-355-499 426-700-252 381-355-500
WGO-4 381-355-494 381-355-593 381-355-501 381-355-502 426-700-252 381-355-771
WGO-5 381-355-494 381-355-593 381-355-503 381-355-504 426-700-254 381-355-505
WGO-6 381-355-494 381-355-593 381-355-506 381-355-507 426-700-256 381-355-508
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 416-700-170 416-700-171
8 section 416-700-172 416-700-173
9 section 416-700-174 416-700-175
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
38
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Replacement parts (continued)
Figure 29 Boiler jacket
Part number 550-141-826/1014
39
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Dimensions
Figure 30 WGO dimensions — inches (mm) — see Table 9, page 41
7 3/16
7 Dia
[177.8]
[182.6]
7 Dia
[177.8]
B
15 1/2
[393.7]
2 5/8
[66.7]
35 5/8
[904.9]
Return
7 3/4
[196.9]
20 1/4
[514.4]
5 1/16 [128.6]
2 9/16 [65.1]
Supply
Air vent or
expansion
tank
4 3/8 Dia
[111.1]
Burner
opening
L
Left side
14 1/8 [358.8]
14
Approx.
2 7/16
[61.9]
Alternate
return
(“A” boilers
only)
2 7/16
[61.9]
Front
7 Dia.
[177.8]
9 1/2 [241.3]
1 1/8 [28.6]
6 1/4
[158.8]
For 7 dia.
[177.8]
Vent pipe
29 9/16
[750.9]
Intermediate Back
40
Part number 550-141-826/1014
Page 41
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Dimensions (continued)
Table 9 Dimensions
BOILER MODEL
NUMBER
Inches mm. Inches mm.
WGO-2 10 1/2 266.7 13 3/4 349.2
B L
WGO-3 13
WGO-4 13 5/8 345.9 16 7/8 428.7
WGO-5 16
WGO-6 20 508 23 1/8 587.2
WGO-7 23
WGO-8 26
WGO-9 29
1/2 342.9 16 7/8 428.7
7/8 428.7 20 508.0
1/8 587.2 26 1/4 666.7
1/4 666.7 29 31/32 746.2
3/8 746.2 32 1/2 825.5
Part number 550-141-826/1014
41
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Ratings
Table 10 GOLD WGO oil-red water boiler ratings
DOE
AHRI Certied Ratings
®
Seasonal
Efciency
AFUE
%
(3)
Heating
Capacity
MBH
(2) (4)
Boiler
Model
(9)
*WGO-2 0.70 98 86 86.4 75 11.0 7 8 x 8 6 15 0.010
*WGO-3R 0.80 112 98 86.2 85
*WGO-3 0.95 133 115 85.3 100 0.020
*WGO-4R 1.00 140 122 86.2 106
*WGO-4 1.20 168 145 85.0 126 0.010
*WGO-5R 1.20 168 147 86.1 128
*WGO-5 1.45 203 175 85.0 152 0.015
*WGO-6R 1.40 196 171 86.1 149
*WGO-6 1.75 245 212 85.0 184 0.015
*WGO-7R 1.60 224 196 86.0 170
*WGO-7 2.00 280 242 85.0 210 0.015
**WGO-8 2.30 322 266 (6) - 231 23.3
**WGO-9 2.55 357 295 (6) - 257 25.8 0.030
Burner Input
GPH
MBH
(3)
Net
Rating
(water)
MBH
(2) (5)
Boiler
Water
Content
Gallons Inches
14.9 7 8 x 8 6 15
13.4 7 8 x 8 6 15
15.9 7 8 x 8 7 15
18.4 7 8 x 8 7 15
20.8 7 8 x 8 8 15
Flue
Outlet
Diameter
(7)
7 8 x 12 8 20
Minimum
Chimney
RectInRoundInHeight
Ft
Draft
Loss
Thru
boiler
In W.C.
(8)
0.020
0.010
0.015
0.015
0.015
0.025
* Substitute “P” for completely assembled packaged boiler without burner (WGO-3 through WGO-6 only).
Substitute “A” for boiler only for use with approved burners as listed with AHRI.
** Available only as an “A” unit.
(1) WGO 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% CO
and -0.02” W.C. dra overre.
(5) Net AHRI 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. Water ratings are based on a piping and pick-up allowance of 1.15. An additional
allowance should be made for unusual piping and pick-up loads.
(6) AHRI gross output.
(7) See page 12 for minimum breeching diameter.
(8) Listed dra losses are for factory-shipped settings.
(9) Boiler model suxes: “R” designates a reduced input version. NOTE: A burner nozzle change is required — refer to the burner
instructions or boiler’s rating label for correct selection.
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Notes
OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Part number 550-141-826/1014
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OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
Part number 550-141-826/1014
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