Oil-Fired Water Boilers
Boiler Manual
• Installation • Maintenance
• Startup
• 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 550-141-826/1014
GOLD
WGO 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
GOLD
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
Contents
Using this manual . . . . . . . . . . . . . . . . . . . . 2
CLOSED expansion tank (Figure 10, page 19) . . . 18
When calling or writing about the boiler . . . . . . . . 2
To connect WGO boilers to indirect-fired
Packaged and non-packaged boilers . . . . . . . . . 2
water heaters . . . . . . . . . . . . . . . . . . . . 18
Hazard definitions . . . . . . . . . . . . . . . . . . . . 2
Piping MULTIPLE ZONES . . . . . . . . . . . . . . 20
Contents . . . . . . . . . . . . . . . . . . . . . . . . . 3
Piping for systems requiring
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
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
WGO (see Figure 1) . . . . . . . . . . . . . . . . . 6
Connect wiring — blocked vent
shutoff switch option . . . . . . . . . . . . . . . . . . 25
Troubleshooting . . . . . . . . . . . . . . . . . . . . . 7
Blocked vent shutoff switch . . . . . . . . . . . . . 25
Before installing boiler . . . . . . . . . . . . . . . . . . 8
Connect oil piping . . . . . . . . . . . . . . . . . . . 26
Installations must comply with . . . . . . . . . . . . 8
General oil piping requirements . . . . . . . . . . . 26
Before selecting boiler location . . . . . . . . . . . . 8
Oil piping connection at burner . . . . . . . . . . . 26
Provide clearances around boiler
Start-up . . . . . . . . . . . . . . . . . . . . . . . . . 27
(see Figure 2) . . . . . . . . . . . . . . . . . . . . . 8
Fill the system . . . . . . . . . . . . . . . . . . . . 27
Provide air for combustion and ventilation . . . . . . 9
When using antifreeze . . . . . . . . . . . . . . . . 27
Foundation . . . . . . . . . . . . . . . . . . . . . . 9
To place in operation . . . . . . . . . . . . . . . . . 27
Install boiler — packaged boilers only . . . . . . . . 10
Check-out procedure . . . . . . . . . . . . . . . . . . 28
Place boiler . . . . . . . . . . . . . . . . . . . . . 10
Check off steps as completed . . . . . . . . . . . . 28
Perform hydrostatic pressure test . . . . . . . . . . 10
Installation and service certificate . . . . . . . . . . 28
Install boiler — non-packaged boilers only . . . . . . 12
Annual service check list . . . . . . . . . . . . . . . . 29
Place boiler . . . . . . . . . . . . . . . . . . . . . 12
Controls requiring annual service . . . . . . . . . . 29
Perform hydrostatic pressure test . . . . . . . . . . 14
Detailed service procedures . . . . . . . . . . . . . . 30
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
Cleaning boiler flueways . . . . . . . . . . . . . . . 30
General description of control operation . . . . . . . 30
Handling ceramic fiber and fiberglass materials . . . 31
Close clearance installation . . . . . . . . . . . . . . 32
Close clearance installation . . . . . . . . . . . . . 32
Burner adjustments for packaged
and non-packaged boilers . . . . . . . . . . . . . . 32
Replacement parts . . . . . . . . . . . . . . . . . . . 34
Dimensions . . . . . . . . . . . . . . . . . . . . . . . 40
Install piping . . . . . . . . . . . . . . . . . . . . . 18
Ratings . . . . . . . . . . . . . . . . . . . . . . . . . 42
DIAPHRAGM expansion tank (Figure 9, page 19) . 18
Notes . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Part number 550-141-826/1014
3
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WGO 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 qualified installer.
• Have boiler and burner serviced annually
by a qualified service technician.
• Review and understand start-up and routine 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.
•
•
•
•
•
4
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.
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 disconnect 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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WGO 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
End
of heating season
Boiler
shutdown
❏❏ 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, immediately 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.
❏❏ 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
5
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WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
Operation
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.
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 combustion chamber. Immediately call qualified service
technician.
3. If burner still does not fire, call qualified service technician.
Figure 1 WGO Boilers
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
GOLD
WGO 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.
Thermostat installed where Locate thermostat on inner wall away from heat sources or cool drafts.
drafts or heat affect reading.
Heat anticipator in thermo- Adjust heat anticipator to match current draw. Refer to boiler wiring
stat adjusted incorrectly.
diagram.
Incorrect limit setting.
Have qualified service technician increase limit setting to decrease
cycling. Maximum setting 220° F.
Need to frequently add
makeup water.
Leaks in boiler or piping.
Have qualified service technician repair leaks at once to avoid constant
use of makeup water.
Popping or percolating
noise heard in boiler.
Mineral deposits in sections Have qualified service technician de-lime boiler, repair leaks at once
due to constant use of make- to avoid constant use of makeup water and check pH (between 7.0
up water, or incorrect pH.
and 8.5).
Black water condition.
Oxygen corrosion due to Have qualified service technician repair leaks at once to avoid constant
leaks in piping.
use of makeup water and check pH (between 7.0 and 8.5).
Frequent release of water
through relief valve.
Expansion tank sized too Have qualified service technician check expansion tank operation.
small or water-logged.
Metal flakes found in
flueway.
Contaminated combustion Remove sources of hydrocarbons in or near boiler area. (Bleaches,
air supply.
cleaners, chemicals, sprays, fabric softeners, paint remover, etc.)
Condensation of combustion Have qualified service technician check boiler operation.
gases.
Some radiators or
baseboard units do not
heat or are noisy.
Domestic water from
tankless heater is hot then
suddenly turns cold.
OR
Domestic water from
tankless heater is always
lukewarm.
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.
Mineral deposits insulate Have qualified service technician delime or replace coil.
internal waterways of heater.
Boiler stop-leak compound Have qualified service technician remove and clean coil and drain,
has been added to boiler wa- and flush boiler to remove stop-leak.
ter and is insulating outside
of coil.
Incorrect mixing valve setting Have qualified service technician adjust mixing valve setting.
for tankless heater.
Domestic flow rate too high. Have qualified service technician install flow check valve set to rating
of tankless heater.
Incorrect setting on tankless Have qualified service technician raise tankless control setting. Adjust
heater control.
differential on tankless control to lower setting.
Part number 550-141-826/1014
7
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WGO 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 qualified 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
Provide clearances around boiler
• United States
• State and local plumbing, heating and electrical codes.
• National codes where applicable.
• Canada
• Canadian Standards Association, CSA B139, Installation Code for OilBurning Equipment.
• CSA C22.1 Canadian Electrical Code Part One.
• Applicable local or provincial codes.
(see Figure 2)
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.
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.
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
Ceiling
Walls
B
B
A
24"
A
24"
B
A
Top View
A Provide 6" minimum clearance for service, provide 12"
minimum clearance for burner door swing.
Wall
B Minimum clearance from vent pipe to combustible material: 6" for type “L” double-wall vent, 9" for single-wall
vent.
Floor
Left side
8
Part number 550-141-826/1014
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WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Before installing boiler
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).
Part number 550-141-826/1014
(continued)
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
Length
inches
Width
inches
Min.
height
inches
WGO-2
14
22
2
WGO-3
17
22
2
WGO-4
17
22
2
WGO-5
20
22
2
WGO-6
23
22
2
WGO-7
26
22
2
WGO-8
29
22
2
WGO-9
32
22
2
Installation instructions:
Packaged boiler
— Continued on page 10
Non-packaged boiler — Continued on page 12
9
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WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install boiler — packaged boilers only
Place boiler
Perform hydrostatic pressure test
1. Remove circulator strapped to pallet.
1. Remove relief valve installed in boiler.
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
under step #6 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 or top of boiler to combustible
material.
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.
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.
Obtain gas-tight seal to prevent possible flue gas leakage
and carbon monoxide emissions, which can lead to severe
personal injury or death.
10
Part number 550-141-826/1014
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WGO 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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WGO 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 materials are possible cancer hazards. See
warning on page 31.
1. Open burner mounting door and, using utility knife, slit floor insulation at joint to be separated.
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
Non-Packaged WGO-7, 8 & 9 — split the assembled
block for easier handling (see Figure 4, page 13)
under Step #3 on page 13.)
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.
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
Part number 550-141-826/1014
GOLD
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install boiler — non-packaged boilers only
Non-Packaged WGO-7, 8 & 9 — install flue
collector hood (see Figure 4)
Obtain gas-tight seal to prevent possible flue gas
leakage and carbon monoxide emissions, leading
to severe personal injury or death.
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.
(continued)
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.
Figure 4 Change from back flue outlet to top flue outlet (optional)
Nut
Washer
Flue
collector
hood
Tinnerman
clip
Sealing
rope in
groove
inside cap
Screw
Sealing
rope with
adhesive
tape
Hold-down
lug
Flue
cap
Flue cap
strap
Separate
block here
for easier
handling
Part number 550-141-826/1014
13
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WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install boiler — non-packaged boilers only
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.
Table 2
14
(continued)
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.
Figure 5 Control tapping locations
Control tappings
Location
Size
Function
B1
1½"
Return piping
B2
1½"
Alternate return piping for
A/B WGO
C
1½"
Supply piping
E3
1/4"
Pressure-temperature
gauge
H
¾"
Drain valve
L
¾"
High limit control
N
½"
Air vent or expansion
tank piping
R1
¾"
Relief valve
N
E3
C
L
R1
B2
B1
H
Front section
Back section
Part number 550-141-826/1014
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WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Install burner — all boilers
Install burner
For P-WGO and A-WGO boiler:
(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.
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.
Figure 6 Water boiler controls
Circulator
Water
pressure-temperature
gauge
Relief
valve
Limit control / low water cut-off
Drain valve
Part number 550-141-826/1014
15
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WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect breeching
General chimney requirements
Table 3
Minimum chimney sizes
• 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.
Oversized chimneys, outside masonry chimneys and/or
derated inputs can result in condensation in chimney.
Boiler
model
number
Minimum
breeching
diameter
(note 3)
Minimum
AHRI
chimney size
Minimum
chimney
height
Rect.
Round
8" x 8"
(note 1)
6"
15'
8" x 8"
(note 1)
7"
15'
7"
20'
WGO-2
5"
WGO-3
WGO-4
6"
WGO-5
6"
WGO-6
7"
WGO-7
WGO-8
7"
WGO-9
8" x 12"
(note 2)
Note 1
6¾" x 6¾" inside liner
Note 2
6½" x 10½" inside liner
Note 3
Flue collar on boiler is 7" diameter
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.
16
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.
Part number 550-141-826/1014
GOLD
WGO 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)
Flue pipe
bracket
(One on each
side of pipe)
Figure 8 Top outlet breeching connection
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
17
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WGO 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.
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
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.
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.
Water piping sizes
Boiler model
number
To system
From system
WGO-2
1"
1"
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
Part number 550-141-826/1014
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WGO 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
Isolation
valve
Automatic
air vent
To system
Isolation
valve
“C” tapping
From
system
“N” tapping
Relief
valve
Cold water
fill
To diaphragm
expansion tank
and fittings
Circulator
(Alternate circulator location)
“B1” tapping
Figure 10 Piping with CLOSED expansion tank
Closed type expansion tank
Circulator
Cold water fill
Isolation valve
To system
“C” tapping
“N” tapping
From
system
Relief
valve
Isolation
valve
Circulator
(Alternate circulator location)
Part number 550-141-826/1014
“B1” tapping
19
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WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect water piping (continued)
Piping MULTIPLE ZONES
Figure 11 Multiple zoning with CIRCULATORS
1. Follow instructions on page 18 and page 19 to
install piping near boiler.
Zone 2
2. See Figure 11 or Figure 12 to complete installation
3. Zoning with circulators:
a. Size each circulator to individual circuit requirements.
b. Remove circulator (when furnished as standard
equipment).
c. Install balancing valves to adjust flow to distribute heat to all zones.
d. Separate relay is required for each circulator.
Zone 1
1
2
1
2
3
1
1
5
5
4. Zoning with zone valves:
a. Install balancing valves to adjust flow to distribute heat to all zones.
b. Separate transformer is required to power zone
valves. Refer to “Weil-McLain Zone Valve Wiring Guide” for details.
Legend
3 Circulator
1 Isolation valve
4 Zone valve
2 Flow control valve
5 Drain valve
Figure 12 Multiple zoning with ZONE VALVES
Zone 2
Zone 1
1
1
4
5
5
1
20
1
Part number 550-141-826/1014
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WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect water piping
Piping for systems requiring
temperatures below 140°F
(continued)
Figure 13 Piping with CIRCULATORS
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.
Legend
7 System temperature
1 Isolation valve
2 Flow control valve
3 Circulator
4 System temperature
gauge
5 Zone valve
6 Drain valve
Figure 14 Piping with ZONE VALVES
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
Part number 550-141-826/1014
gauge
21
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WGO 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
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
state or local codes.
any additional national,
• 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.
1
Supply
Thermostat wiring
Exp. tank
1
Circ.
Circ.
Chiller
Strainer
• 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.
Zone Valve Wiring
Exp. tank
1
2
1 Isolation valve
1
2 Balancing valve
DO NOT connect directly from 3-wire zone valves
to the T-T terminals on the boiler. When using 3-wire
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.
22
Part number 550-141-826/1014
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WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Connect wiring (continued)
Junction box (furnished)
High temperature limit
• 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.
• 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
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.
Service
switch
on
boiler
Burner
wiring
harness
Circulator
wiring
harness
(not
furnished
on “A”
boilers)
Burner
disconnect plug
Part number 550-141-826/1014
23
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WGO 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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WGO 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:
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.
1. Disconnect power.
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
25
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WGO 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 OilBurning Equipment.
• In Canada, CSA B139, Installation of OilBurning 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.
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.
Figure 20 Recommended oil piping connection to burner
See local codes for
appropriate arrangement and
piping of filter control valves,
etc., back to oil tank
26
Flare fitting
Part number 550-141-826/1014
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WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Start-up
Fill the system
To place in operation
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.
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.
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.
Part number 550-141-826/1014
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.
27
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WGO 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
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.
❏❏ Boiler and heat distribution units filled with water?
❏❏ Limit control set to system temperature requirements (max.
❏❏ Automatic air vent, if used, opened one full turn?
220°F)?
❏❏ Air purged from system? Piping checked for leaks?
❏❏ For multiple zones, flow adjusted to distribute heat in all
zones?
❏❏ Air purged from oil piping? Piping checked for leaks?
❏❏ Thermostat heat anticipator setting (if available) set properly?
❏❏ Flue cap in place and tightened? Burner door closed, sealed
and nut tight? Burner plugged in and service switch on?
Refer to “Connect wiring,” page 22.
❏❏ Boiler cycled with thermostat? Raise to highest setting and
Obtain gas-tight seal to prevent possible flue gas
leakage and carbon monoxide emissions, leading
to severe personal injury or death.
verify boiler goes through normal start-up cycle. Lower to
lowest setting and verify boiler goes off.
❏❏ Observed several operating cycles for proper operation?
❏❏ Proper draft and burner flame? Final adjustment made with
combustion test equipment?
❏❏ Set room thermostat(s) to desired room temperature?
❏❏ 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.
❏❏ Test additional field-installed controls: If boiler has a low
water cutoff, additional high limit or other controls, test
❏❏ Completed Installation and Service Certificate below?
❏❏ Reviewed pages 1–7 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?
Installation and service certificate
Date Installed:_____________________________
Boiler Model Number:________ Series:_____________
❏❏ Installation instructions have been followed.
❏❏ Check-out procedure has been performed.
❏❏ Above information is certified to be correct.
CP Number(s):____________________________
❏❏ Information received and left with owner/maintenance
Measured Btu or GPH Input:_________________
person.
Installer:_________________________________________________________________________________________________
(Company)(Address)(Phone)
_________________________________________
(Installer’s Signature)
28
Part number 550-141-826/1014
GOLD
WGO 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)
1
Check that boiler area is free from
combustible materials, gasoline and
other flammable vapors and liquids.
2
Check for and remove any obstruction
to combustion and ventilation air flow
to boiler.
3
Check breeching and chimney or vent
for obstructions, damage, etc. Repair
or replace as necessary.
4
Clean boiler flueways. See Figure 21, page 30.
5
Perform service on relief valve and
circulator. See page 30.
6
Check boiler and piping for leaks and
repair if found. Check for leaks at
tankless heater plate. Tighten nuts only
if leaks are found (for WGO torque to
20-25 ft.lbs.).
7
Inspect and adjust burner. See burner
manual and:
• change nozzle.
• check ignition electrode settings.
• clean blower housing and wheel.
• make sure blower wheel turns
freely.
• oil burner motor if required.
• clean air inlet.
• clean or change fuel filter and
strainer.
8
Make sure boiler is filled with water.
9
Start unit and verify combustion settings with combustion test equipment.
See page 28.
Dates
Comments
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.
Controls requiring annual service
Water Relief Valve
Check operation of water relief valve.
Follow instructions on label fastened to
relief valve.
Part number 550-141-826/1014
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
GOLD
WGO 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.
Figure 21 Thoroughly clean flueways between all pins
at all angles. Start on top of boiler, finish from
the bottom.
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.
Maintain a gas-tight seal to avoid possible flue gas leakage 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
Water relief valve
Provides discharge if boiler pressure exceeds 30 psig.
Automatic air vent
Circulator
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.
Circulator provides forced water circulation through boiler
and piping system.
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.
30
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.
Part number 550-141-826/1014
GOLD
WGO 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).”:
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.
❏❏ Apply enough water to the combustion chamber
lining or base insulation to prevent airborne dust.
❏❏ Remove combustion chamber lining or base insulation from the boiler and place it in a plastic
bag for disposal.
❏❏ Wash potentially contaminated clothes separately
from other clothing. Rinse clothes washer thoroughly.
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
NIOSH stated First Aid
❏❏ Eye: Irrigate immediately
❏❏ Breathing: Fresh air
Part number 550-141-826/1014
31
GOLD
WGO 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 requiring an 9" minimum clearance from back or top of
boiler to combustible material. Flue pipe clearances
must take precedence over jacket clearances.
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 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.
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.
3. Burner should be adjusted to 13% CO2 or less with a smoke
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 sufficient combustion air supply can affect proper combustion
and boiler performance. The burner should only be adjusted
by a service professional with appropriate instrumentation.
Figure 22 Manual reset temperature switch location
Figure 23 Manual reset temperature switch wiring
Manual reset
temperature switch
Combustible surface
#6 X ½" Phillips
Sheet metal
screw
1 to 5
inches
44156
Thermostat
Manual reset
temperature
switch
Bracket
#10 X ½" Phillips
sheet metal screw
Area above boiler
32
Part number 550-141-826/1014
GOLD
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Close clearance installation
Figure 24 Flue pipe clearances
(continued)
Figure 25 Back vent clearances
Combustible surface
24" For servicing
or min. 2" For close
clearances
A
A
A
6"
6"
Protection
Combustible
surface
Type “L” double-wall
vent Type
piping“L”
double-wall
vent pipe
Table 5
Combustible
surface
Protection required for clearances
less than 6 inches from doublewall
vent pipe*
Note: 2" min. on sides
Dimension A
When desired minimum
clearance from
Type “L” double-wall
vent pipe to combustible
surface is:
Use the following
protection**:
3"
½” thick insulation board
***
over one-inch glass fiber
or mineral wool batts+
2"
3"
2"
Figure 26 Top vent clearances
A
A
24 gauge sheet metal with
one-inch ventilated air
space
Combustible
surface
½” thick insulation board
***
with one-inch ventilated air
space
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 noncombustible 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.
24" For
servicing
or min. 2"
For close
clearances
*
Part number 550-141-826/1014
2"
2"
Combustible
surface
Note: 2" min. on sides
33
GOLD
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Replacement parts
Table 6
Item
34
Series 3 section and flue collector parts
Description
Part no.
Item
Description
Part no.
A
Regular front section 7022
316-700-215
F
Collector hood kit for WGO-7*
450-020-188
B
Wide intermediate section
(WGO-3) 7010
316-700-075
F
Collector hood kit for WGO-8*
450-020-189
F
Collector hood kit for WGO-9*
450-020-190
B
Narrow intermediate section
7015
316-700-065
G
Tie rod 1/2 x 51/2 (WGO-7, 8, 9)
560-234-464
C
Intermediate section w/draw rod
lugs 7016
316-700-070
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
D
Back section w/7" flue, supply &
2" return 7027
316-700-235
G
Tie rod 1/2 x 14 (WGO-3, 4, 8, 9)
560-234-470
G
Tie rod 1/2 x 15 (WGO-9)
560-234-495
E
Section replacement kit
(for 1 joint, includes seals, rope,
adhesive and collector hood
hardware) front or back section
386-700-852
G
Tie rod 1/2 x 17 (WGO-5)
560-234-472
G
Tie rod 1/2 x 20 (WGO-6)
560-234-534
Section replacement kit
(for 2 joints, includes seals, rope
and adhesive)
intermediate section
G
Tie rod 1/2 x 231/4 (WGO-7)
560-234-538
386-700-851
G
Tie rod 1/2 x 263/8 (WGO-8)
560-234-542
G
Tie rod 1/2 x 291/2 (WGO-9)
560-234-497
Section assembly complete, for
WGO-2
386-700-650
H
386-700-355
Section assembly complete, for
WGO-3
386-700-651
Combustion chamber kit (rear & frt.
ref., door ref. blanket, rope, blanket
& water glass)
Section assembly complete, for
WGO-4
386-700-358
386-700-652
Burner mounting door assembly
(door, obs. port, rope, ins. & pins)
J
Burner mounting door 7070
330-054-302
Section assembly complete, for
WGO-5
386-700-653
K
Door hinge 7054
330-054-300
Section assembly complete, for
WGO-6
386-700-654
L
Door refractory
386-700-359
M
Door refractory blanket
591-222-115
Section assembly complete, for
WGO-7
386-700-655
N
Observation port shutter
460-039-867
Section assembly complete, for
WGO-8
P
Door seal rope 5'
590-735-104
386-700-656
Q
Section assembly complete, for
WGO-9
3/8" Glass rope for collector hood
590-735-109
(7' for largest size hood)
386-700-657
R
386-700-344
F
Collector hood kit for WGO-2*
386-700-336
Flue cap assembly
(cap, strap, rope & screws)
F
Collector hood kit for WGO-3*
386-700-337
Flue brush 123D
591-706-214
F
Collector hood kit for WGO-4*
386-700-337
Blocked vent shutoff switch
(Canada only)
511-624-650
F
Collector hood kit for WGO-5*
386-700-338
F
Collector hood kit for WGO-6*
386-700-339
*
Includes flue cap assembly, rope and hardware for
installation.
Part number 550-141-826/1014
GOLD
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Replacement parts
(continued)
Figure 27 Parts drawing
R
D
F
E
Q
G
B
A
K
H
G
H
H
H
J
N
G
C
L
M
P
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
35
GOLD
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Replacement parts
Table 7
Series 3 trim parts
Fig.
No.
1
2
3
4
5
6
(continued)
Description
Combination pressure-temperature gauge kit, 60° – 360° F., 0 - 75
psi, 3 1/8" dia., 1/4" NPT, short shank, with 1/4" x 1/2" reducing bushing
Mfr.
Mfr. part no.
Weil-McLain
Part no.
380-000-000
ASME pressure relief valve, set to relieve at 30 PSIG, 3/4" male inlet,
female outlet
Conbraco
M330
511-546-920
Electronic aquastat, high limit or combination high/low limit, with
LWCO, high limit 100°– 220°, low limit 110°- 200°, circulator amps:
5.8 FLA, anticipator: 0.2 amps
Hydrolevel
3250
381-300-000
Drain cock, 3/4", 11/2" shank
Conbraco
31-606-01
511-210-423
Drain cock, 3/4"
Hammond
710
Drain cock, 3/4"
Watts
BD2C
Drain cock, 3/4"
Matco-Norca
Drain cock, 3/4"
Nibco
#74
Circulator, 1/25 HP, 120/60/1 motor, 175 RPM, 0.75 amps
Taco
W007F
3/4"
511-246-392
511-405-113
Circulator universal hardware kit 11/4" (Includes: (1) Flange, (1)
Gasket, (2) Screws and (2) nuts) for sizes 2, 3 & 4 only
Weil-McLain
381-354-526
Circulator universal hardware kit 11/2" (Includes: (1) Flange, (1)
Gasket, (2) Screws and (2) nuts) for sizes 5 & 6 only
Weil-McLain
381-354-531
Hydrolevel
592-300-026
7
3/4"
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
11
(Not shown) Junction box - wiring harness assembly (series 2 & 3 A
& B only)
Weil-McLain
591-391-837
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
NPT well, 4.25" long
Vent damper kits - Required for ENERGY STAR® compliance, (Version 3.0
Boilers specification of 87% AFUE), with reduced rates only
16
36
WGO-2RD
WGO-3RD
WGO-4RD
WGO-5RD
WGO-6RD
WGO-7RD
(Optional equipment)
(Optional equipment)
(Optional equipment)
(Optional equipment)
(Optional equipment)
(Optional equipment)
Field Controls
Weil-McLain
OVD-7
381-800-501
381-800-502
381-800-503
381-800-504
381-800-505
381-800-506
Part number 550-141-826/1014
GOLD
WGO 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
GOLD
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Replacement parts
Table 8
(continued)
Weil-McLain part numbers
1
2
Jacket panel with insulation —
front
Model
Left side and rear
3
Right side and
rear
Top panel with
cap
UL
Non-UL
UL
Non-UL
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
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
GOLD
WGO 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
GOLD
WGO 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
[182.6]
7 Dia
[177.8]
7 3/4
[196.9]
2 5/8
[66.7]
20 1/4
[514.4]
5 1/16 [128.6]
2 9/16 [65.1]
Supply
7 Dia
[177.8]
Air vent or
expansion
tank
35 5/8
[904.9]
4 3/8 Dia
[111.1]
Burner
opening
B
Return
15 1/2
[393.7]
9 1/2 [241.3]
L
Left side
14
Approx.
2 7/16
[61.9]
2 7/16
[61.9]
1 1/8 [28.6]
Front
7 Dia.
[177.8]
6 1/4
[158.8]
For 7 dia.
[177.8]
Vent pipe
Alternate
return
(“A” boilers
only)
29 9/16
[750.9]
14 1/8 [358.8]
Intermediate
40
Back
Part number 550-141-826/1014
GOLD
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Dimensions
(continued)
Table 9Dimensions
B
L
BOILER MODEL
NUMBER
Inches
mm.
Inches
mm.
WGO-2
10 1/2
266.7
13 3/4
349.2
WGO-3
13 1/2
342.9
16 7/8
428.7
WGO-4
13 5/8
345.9
16 7/8
428.7
WGO-5
16 7/8
428.7
20
508.0
WGO-6
20
508
23 1/8
587.2
WGO-7
23 1/8
587.2
26 1/4
666.7
WGO-8
26 1/4
666.7
29 31/32
746.2
WGO-9
29 3/8
746.2
32 1/2
825.5
Part number 550-141-826/1014
41
GOLD
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Ratings
Table 10 GOLD WGO oil-fired water boiler ratings
DOE
®
AHRI Certified Ratings
Boiler
Model
(9)
Burner Input
GPH
(3)
MBH
Heating Seasonal
Capacity Efficiency
Net
Rating
(water)
Boiler
Water
Content
Flue
Outlet
Diameter
In W.C.
(8)
0.010
MBH
AFUE
%
(2) (5)
MBH
Gallons
Inches
11.0
7
8x8
6
15
14.9
7
8x8
6
15
98
86
86.4
75
*WGO-3R
0.80
112
98
86.2
85
*WGO-3
0.95
133
115
85.3
100
*WGO-4R
1.00
140
122
86.2
106
*WGO-4
1.20
168
145
85.0
126
*WGO-5R
1.20
168
147
86.1
128
0.020
0.010
1.45
203
175
85.0
152
*WGO-6R
1.40
196
171
86.1
149
1.75
245
212
85.0
184
*WGO-7R
1.60
224
196
86.0
170
2.00
280
242
85.0
210
* * WGO-8
2.30
322
266 (6)
-
231
7
295 (6)
-
257
15
8x8
7
15
0.015
7
8x8
7
15
0.015
0.015
7
8x8
8
15
0.015
23.3
0.025
7
357
6
0.015
20.8
*WGO-7
8x8
0.015
18.4
*WGO-6
7
0.010
15.9
*WGO-5
(7)
0.020
13.4
8 x 12
8
25.8
20
0.030
*
**
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)
(2)
(3)
(4)
WGO boiler designed with convertible vertical and horizontal flue outlet.
MBH refers to thousands of Btu per hour.
Based on 140,000 Btu/gal.
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. draft overfire.
Net AHRI ratings are based on net installed radiation of sufficient 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.
AHRI gross output.
See page 12 for minimum breeching diameter.
Listed draft losses are for factory-shipped settings.
Boiler model suffixes: “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.
(5)
(6)
(7)
(8)
(9)
42
Rect Round Height
In
In
Ft
(2) (4)
0.70
2.55
Draft
Loss
Thru
boiler
(3)
*WGO-2
* * WGO-9
Minimum
Chimney
Part number 550-141-826/1014
GOLD
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
SERVICE TECHNICIAN ONLY — read and follow completely.
Notes
Part number 550-141-826/1014
43
GOLD
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 3 — Boiler Manual
Part number 550-141-826/1014