WGO
SERIES 3 OIL-FIRED NATURAL DRAFT WATER BOILER
This Manual
Includes:
Installation
Start-Up
Boiler Parts
As an EVERGY STAR Partner, Weil-McLain
has determined that this product meets the
ENERGY STAR guidelines for energy efficiency
Installer: • Make sure this is the correct manual for the boiler. Verify boiler model on
rating label.
• Leave all documentation received with boiler and burner with unit for
future reference.
User: Boiler and burner must be installed and serviced by qualified service technician.
Part No. 550-141-826/1201
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Table of Contents
Read all instructions before installing. Failure to follow all instructions in proper order can
cause severe personal injury, death or substantial property damage.
Read This Page First . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Before Installing Boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-5
Install Packaged Boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-7
Install Non-Packaged Boiler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-11
Connect Breeching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12-13
Connect Water Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-18
Connect Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19-21
Connect Oil Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Check-Out Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .24
Installation and Service Certificate . . . . . . . . . . . . . . . . . . . . . . . .24
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25-27
Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Parts Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30-31
Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Back Cover
3
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Before Installing Boiler
Installations must comply with:
Provide clearances around boiler
(see FIGURE 1):
•
U.S.
— State and local plumbing, heating and
electrical codes.
Jacket cap must be in place on
— National codes where applicable.
Canada
boiler to avoid requiring an 18"
minimum clearance from back or top of boiler to
combustible material.
•
— Canadian Standards Association,
CSA B139, Installation Code for
Oil-Burning Equipment.
— CSA C22.1 Canadian Electrical Code Part One.
— Applicable local or provincial codes.
•
Minimum clearances from vent pipe to
combustible material:
6 inches — Type “L” doublewall vent*
18 inches — Singlewall vent*
Before selecting boiler location:
•
Check for nearby connections to:
— System water piping.
Flue pipe clearances must take
precedence over jacket clearances.
— Chimney. See pages 12-13. Boiler can be top
or back vented.
— Combustion and ventilation air supply. See
page 5.
— Oil supply. See page 22 for oil line routing.
— Electrical power.
•
•
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 ∆
•
Check area around boiler. Remove any
combustible materials, gasoline and other
flammable liquids.
Special close clearances (alcove, closet, under
counters, etc.) — see Appendix, pages 25-27.
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.
Ceiling
*
6"
(18")
*
6"
(18")
24"
Walls
6" (12") ∆
*
6"
(18")
24"
6"
Wall
6"
Floor
TopView
Left Side
Recommended Service Clearances
FIGURE 1
4
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Before Installing Boiler
CONTINUED
•
Through horizontal ducts — at least 70 sq. in. per
1 GPH boiler input (1 sq. in. per 2000 Btu input)
of all fuel-burning appliances plus requirements for
any equipment that can pull air from room
(including clothes dryer and fireplace).
Where ducts are used, they should have same
cross-sectional area as free area of openings to
which they connect. Compensate for louver,
grille or screen blockage when calculating free
air openings. Refer to their manufacturer’s
instructions for details. If unknown, use:
— Wood louvers, which provide 20-25% free air.
— Metal louvers or grilles, which provide
60-75% free air.
Provide air for combustion and ventilation:
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.
Do not install exhaust fan in boiler room.
Older buildings with single-pane windows,
minimal weather-stripping and no vapor barrier
often provide enough natural infiltration and
ventilation without dedicated openings.
Lock louvers in open position or interlock with
equipment to prove open before boiler operation.
New construction or remodeled buildings are most
often built tighter. Windows and doors are
weather-stripped, vapor barriers are used and
openings in walls are caulked. As a result, such
tight construction is unlikely to allow proper
natural air infiltration and ventilation.
Lay a foundation, if needed:
Boiler may be installed on non-carpeted
combustible flooring.
For residential garage installation, install boiler so
burner is at least 18 inches above floor to avoid
contact with gasoline fumes.
Follow state, provincial or local codes when sizing
adequate combustion and ventilation air openings.
In absence of codes, use the following guidelines
when boiler is in a confined room (defined by NFPA
31 as less than 7200 cubic feet per 1 GPH input of
all appliances in area. A room 8 ft. high x 33.5 ft. x
33.5 ft. is 7200 cu. ft.):
A level concrete or masonry foundation is
required when:
•
•
Floor could possibly become flooded.
Non-level conditions exist.
Solid concrete blocks can be used to create a pad.
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.
BOILER FOUNDATION SIZE TABLE
MIN.
BOILER
MODEL
LENGTH
INCHES
WIDTH
INCHES
HEIGHT
INCHES
When inside air is used — each opening must
freely connect with areas having adequate
WGO-2
WGO-3
WGO-4
WGO-5
WGO-6
WGO-7
WGO-8
WGO-9
14
17
17
20
23
26
29
32
22
22
22
22
22
22
22
22
2
2
2
2
2
2
2
2
infiltration from outside. Each opening should be at
least 140 sq. in. per 1 GPH input (1 sq. in. per 1000
Btu input) of all fuel-burning appliances plus
requirements for any equipment that can pull air
from room (including clothes dryer and fireplace).
When outside air is used — connect each
opening directly or by ducts to the outdoors or to
crawl or attic space that freely connects with
outdoors. Size per below:
•
Through outside wall or vertical ducts — at least 35
sq. in. per 1 GPH input (1 sq. in. per 4000 Btu
input) of all fuel-burning appliances plus
Go to page 6
to install boiler
requirements for equipment that can pull air from
room (including clothes dryer and fireplace).
Go to page 8
to install boiler
5
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Install Packaged Boiler
Place boiler:
1. Remove circulator strapped to pallet.
Perform hydrostatic pressure test:
1. Remove relief valve installed in boiler.
2. Install air vent in “N” tapping on top boiler.
Circulator will be damaged if
not removed before boiler is
lifted from pallet.
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.
2. Remove boiler from pallet.
Do not leave boiler unattended.
Cold water fill can expand and
damage cast iron, resulting in severe personal
injury, death or substantial property damage.
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.
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.
3. Boiler is shipped for back flue outlet. To
change to top flue outlet (see FIGURE 2):
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.
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.
(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.
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.
Go to page 12 to connect
breeching and venting
6
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Install Packaged Boiler
CONTINUED
Change From Back Flue Outlet to Top Flue Outlet (Optional)
FIGURE 2
7
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Install Non-Packaged Boiler
3) Loosen two screws on back flue outlet.
Fiberglass wool and ceramic fiber materials:
Set flue cap on outlet. Install strap by
engaging slots in screws. Tighten screws.
Make sure cap is securely installed.
• POSSIBLE CANCER HAZARD
BY INHALATION
• CAN CAUSE RESPIRATORY,
2.
Non-Packaged WGO-7, 8 & 9 — split the
assembled block for easier handling (see
FIGURE 3):
SKIN AND EYE IRRITATION
This product contains fiberglass wool and ceramic
fiber materials. Airborne fibers from these materials
have been listed by the State of California as a
possible cause of cancer through inhalation. Apply
special care when handling ceramic fiber (chamber
lining and base insulation) materials. Ceramic fibers
can be converted to chrystobalites, a substance listed
as a probable cause of cancer.
a. Open burner mounting door and,
using utility knife, slit floor insulation at
joint to be separated.
b. Remove 5½" draw rod and the longest
draw rod from each side. Pull block apart.
Save draw rods, nuts, washers and sealing
rings for reassembly.
c. Move divided block to location.
d. Clean port openings with clean rag.
Suppliers of fiberglass wool products recommend
the following precautions be taken when handling
these materials:
Do not use petroleum-based
compounds to clean openings.
Precautionary measures:
•
Avoid breathing fiberglass dust and contact
Damage to system components can result,
causing property damage.
with skin and eyes.
•
•
Use NIOSH approved dust/mist respirator.
Wear long-sleeved, loose fitting clothing, gloves
and eye protection.
Wash work clothes separately from other
clothing. Rinse washer thoroughly.
Operations such as sawing, blowing, tearout
and spraying may generate airborne fiber
concentration requiring additional protection.
e. Place rings in port openings. If ring slips
out of groove, stretch ring gently for several
seconds, then place in groove.
f. Position sections so aligning lugs fit into
sockets of next section. Make sure sealing
rope is in good condition and in position.
g. Oil threads on draw rods. Install
washer and nut on end to be tightened.
Use nut only on other end.
h. With wrench at washer/nut end,
uniformly tighten nuts starting with
5½" rod at large port, 5½" rod at
small port, bottom long rod and finally
top long rod.
•
•
First aid measures:
•
Eye contact — Flush eyes with water to remove
dust. If symptoms persist, seek medical attention.
Skin contact — Wash affected areas gently
with soap and warm water after handling.
•
Place boiler:
1. Non-Packaged WGO-2 through 6 — position on site.
i. 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.
j. Metal-to-metal contact should be
made around port openings. If gap
does exist, it should be less than .020".
Check with feeler gauge.
Smaller sized boilers may be
top heavy. Use caution when
handling to avoid minor personal injury or
property damage.
a. Boiler is shipped for back flue outlet. To
change to top flue outlet (see FIGURE 3):
1) Loosen two screws holding flue cap
strap to collector hood. Remove strap
and flue cap from opening.
k. If gap around port openings exceeds
.020", check for dirt on port openings,
sockets or misaligned lugs. If
Re-tighten screws.
2) Check rope placement inside flue cap.
corrections are made and gap still
exists, contact your Weil-McLain
distributor or sales office before
continuing installation.
(Read
under Step #3 on page 9.)
8
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Install Non-Packaged Boiler
CONTINUED
3. Non-Packaged WGO-7, 8 & 9 — install flue
d. Install washers and nuts. Tighten nuts
until collector hood makes contact with
tinnerman clip.
collector hood (see FIGURE 3):
Obtain gas-tight seal to prevent
possible flue gas leakage and
carbon monoxide emissions, leading to severe
personal injury or death.
e. 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.
a. Thread tinnerman clip on screw so that
clip fits snugly in notch of hold-down lug.
Screw must not turn.
b. Remove paper on sealing rope. Starting at
back section near flue collar, position
sealing rope around top of block with
adhesive side to sections. Do not stretch
rope. Make sure rope ends meet. Trim
excess rope.
Top flue outlet boiler — Position flue cap
and strap over opening in back section.
Make sure rope in cap is in place and in
good condition. Tighten strap to boiler with
screws provided in section. Install
remaining screws in holes in flue
collector hood.
4. Check level. Shim legs, if needed.
c. Position flue collector hood on top of boiler
sections and over screws and clips as
shown in FIGURE 3.
Nut
Washer
Tinnerman
Clip
Flue Collector
Hood
Sealing Rope in
Groove Inside Cap
Screw
Hold-down
Lug
Sealing Rope
with Adhesive
Tape
Flue
Cap
Flue Cap
Strap
Change From Back Flue Outlet to Top Flue Outlet (Optional)
FIGURE 3
9
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Install Packaged and Non-Packaged Boiler
7. Visually check:
Perform hydrostatic pressure test:
1. See FIGURE 4 and Control Tapping Table
below to install:
a. Sealing rope placement.
b. Metal-to-metal contact around port openings.
c. Flue collector hood seal.
d. Burner mounting door seal.
a. Boiler drain.
b. Water pressure gauge (test only). Be sure
gauge can handle test pressure.
Obtain gas-tight seal to prevent
possible flue gas leakage and
c. Air vent in upper “N” tapping.
d. Plugs in remaining tappings.
carbon monoxide emissions, which can lead to
severe personal injury or death.
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.
Install jacket (sizes 7 through 9 only):
Before installing jacket, remove burner mounting
door. See jacket instructions for details.
Do not leave boiler unattended.
Cold water fill could expand and
damage cast iron, resulting in severe personal
injury, death or substantial property damage.
Install boiler controls:
See Control Tapping Table and FIGURES 4 and 5
to install controls.
3. Check for maintained gauge pressure for more
than 10 minutes. Visually check for leaks if
gauge pressure drops.
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.
4. Drain boiler. Repair leaks if found.
Do not use petroleum-based
compounds to repair leaks.
CONTROLTAPPINGTABLE
Damage to system components can result,
causing property damage.
LOCATION
SIZE
1½"
FUNCTION
Return Piping
B1
Alternate Return Piping
for A/B WGO
Supply Piping
Pressure-Temperature Gauge
DrainValve
B2
1
"
½
5. Re-test boiler after repairing leaks.
6. Remove pressure gauge, air vent and plugs
from tappings used for controls.
C
E3
H
1½"
¾"
¾"
¾"
L
High Limit Control
Air Vent or
N
½"
¾"
Expansion Tank Piping
R1
Relief Valve
N
C
E3
L
R1
B2
B1
Front Section
H
Back Section
Control Tapping Location
FIGURE 4
10
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Install Packaged and Non-Packaged Boiler
Install burner (also refer to instructions packed with burner):
Burners designed for use with Weil-McLain 68 boilers must not be used on GOLD Oil
boilers. Contact individual burner manufacturers for GOLD Oil applications.
For P-WGO and A-WGO boiler:
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.
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
Circulator
Water
Pressure-Temperature
Gauge
Relief
Valve
Limit Control
Drain Valve
Water Boiler Controls
FIGURE 5
11
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Connect Breeching
General chimney requirements:
MINIMUM CHIMNEY SIZE TABLE
•
Designed for natural draft firing. Connect
boiler to vertical chimney.
MINIMUM
I=B=R
***
BOILER
MODEL
NUMBER
WGO-2
WGO-3
WGO-4
WGO-5
WGO-6
WGO-7
WGO-8
WGO-9
MINIMUM
MINIMUM
CHIMNEY SIZE CHIMNEY
BREECHING
DIAMETER
Insufficient draft can cause flue
gas leakage and carbon
monoxide emissions, which will lead to severe
personal injury or death.
RECT. ROUND
HEIGHT
15'
5"
8" x 8"
*
6"
6"
6"
•
•
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.
8" x 8"
*
7"
7"
15'
20'
7"
7"
8" x 12"
**
*
6¾" x 6¾" inside liner
** 6½" x 10½" inside liner
*** Flue collar on boiler is 7" diameter
NFPA 211 requires chimney to be lined before
connected to boiler.
Connect breeching:
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.
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.
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.
1. Install 2 flue pipe brackets.
2. Connect full-sized breeching when possible.
See Minimum Chimney Size Table.
— Back outlet — see FIGURE 6.
— Top outlet — see FIGURE 7.
3. Connection must be made above bottom of
chimney to avoid blockage. Breeching must not
enter chimney far enough to cause obstruction.
Use thimble or slip joint where breeching enters
chimney to allow removal for cleaning.
4. When burner and boiler are properly installed,
draft overfire will be approximately -0.01"
to -0.02" W.C. Install barometric control in
breeching, per control manufacturer’s
instructions, when excess draft needs to be
relieved or to comply with applicable codes
and regulations. Use draft gauge to adjust
proper opening.
•
•
Minimum clearances from vent pipe to
combustible material:
6 inches — Type “L” doublewall vent
18 inches — Singlewall vent
Minimum chimney sizes should be used.
Oversized chimneys, outside
masonry chimneys and/or derated
inputs can result in condensation in chimney.
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.
12
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Connect Breeching
CONTINUED
Typical Location for
Barometric Control
(Also see Control
Manufacturer’s
Instructions)
Flue Pipe
Bracket
(one on each
side of pipe)
Back Outlet Breeching Connection
FIGURE 6
Typical Location for
Barometric Control
(Also see Control
Manufacturer’s
Instructions)
Flue Pipe Bracket
(one on each side of pipe)
Top Outlet Breeching Connection
FIGURE 7
13
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Connect Water Piping
General piping information:
DIAPHRAGM expansion tank (FIGURE 8):
•
•
•
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 a low water cutoff device when:
— Boiler is installed above radiation level.
— Required by certain state or local codes or
insurance companies.
Use low water cutoff designed for water
installations. Probe-type is recommended.
Purchase and install in tee in supply line
above boiler.
Use backflow check valve in cold water supply
as required by local codes.
•
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 8.
CLOSED expansion tank (FIGURE 9):
•
Ensure expansion tank size will handle boiler
and system water volume and temperature.
Install piping:
Undersized expansion tanks cause
system water to be lost from relief
valve and makeup water added through fill valve.
Eventual section failure can result.
•
See FIGURE 8 or 9 on page 15 and Water
Piping Size Table at right for near-boiler piping
and single-zone piping. See page 16 to complete
multiple-zone piping or page 17 to complete
piping for systems operating below 140°F.
•
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.
For multiple-boiler piping, refer to Weil-McLain’s
“Primary/Secondary Piping Guide” and “M-WGO
Multiple Boiler Manual.”
WATER PIPING SIZE TABLE *
BOILER
•
Install relief valve vertically in “R1” tapping on
front of boiler. See FIGURE 8 or 9 and also
refer to tag attached to relief valve for
manufacturer’s instructions.
MODEL
TO
FROM
NUMBER
SYSTEM
SYSTEM
WGO-2
WGO-3
WGO-4
WGO-5
WGO-6
WGO-7
WGO-8
1"
1"
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.
1¼"
1¼"
1½"
1½"
1½"
2"
1¼"
1¼"
1½"
1½"
1½"
2"
WGO-9
2"
2"
*
All piping sizes based on 20°F
temperature rise through boiler.
14
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Connect Water Piping
CONTINUED
Isolation
Valve
Circulator
Automatic
AirVent
To
System
“C”Tapping
“N”Tapping
Relief
Valve
From
System
Isolation
Valve
Cold Water
Fill
To Diaphragm
ExpansionTank
and Fittings
*Circulator
“B1”Tapping
*Alternate Pump Location
Piping with DIAPHRAGM Expansion Tank
FIGURE 8
Closed Type Expansion Tank
Circulator
Cold Water Fill
IsolationValve
To System
“C”Tapping
“N”Tapping
From
System
Relief
Valve
Isolation
Valve
*Circulator
“B1”Tapping
*Alternate Pump Location
Piping with CLOSED Expansion Tank
FIGURE 9
15
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Connect Water Piping
CONTINUED
Piping MULTIPLE ZONES:
1. Follow instructions on page 14 and 15 to install piping near boiler.
2. See FIGURE 10 or 11 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.
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:
1
2
3
4
5
Isolation valve
Flow control valve
Circulator
Zone valve
Drain valve
ZONE 2
ZONE 2
ZONE 1
ZONE 1
1
1
1
1
2
4
3
2
1
1
5
5
1
1
5
5
Multiple Zoning With CIRCULATORS
FIGURE 10
Multiple Zoning With ZONE VALVES
FIGURE 11
16
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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 12 or
13. If system piping is plastic without an oxygen barrier, a heat exchanger must be used.
Legend:
1
2
3
4
5
6
7
Isolation valve
Flow control valve
Circulator
System temperature gauge
Zone valve
Drain valve
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
9
Blend temperature gauge
Boiler temperature gauge
Piping with CIRCULATORS
FIGURE 12
Piping with ZONE VALVES
FIGURE 13
17
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Connect Water Piping
CONTINUED
Use with refrigeration systems:
•
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.
•
Install boiler so that chilled medium is piped in
parallel with heating boiler. Use appropriate valves
to prevent chilled medium from entering boiler.
Consult I=B=R Installation and Piping Guides.
1
Supply
Exp.Tank
1
Circ.
Circ.
Chiller
Strainer
Exp. Tank
1
1
2
1
Isolation valve
Balancing valve
2
Use with Refrigeration System
FIGURE 14
18
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Connect Wiring
General wiring requirements:
Junction box (furnished):
•
Junction box houses electrical connections for
all boiler components.
Electric shock hazard. Can cause
•
•
“P” boilers have harnesses furnished.
“A” boilers are furnished with burner and limit
harnesses.
severe personal injury or death if
power source, including service switch on boiler, is
not disconnected before installing or servicing.
•
•
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.
•
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.
•
•
Service switch (15 amp) is provided with boiler.
“A” boilers — install switch as shown.
Some local codes may require an emergency
shut-off switch installed at a location away
from boiler. Follow 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.
Burner wiring:
Provide electrical ground at boiler as required
by codes.
•
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 15. 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.
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.
•
19
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Connect Wiring
CONTINUED
Limit Control
Wiring Harness
Circulator Wiring
Harness
(Not Furnished
on “A” Boilers)
Service Switch
On Boiler
Burner Wiring
Harness
Burner
Disconnect Plug
Boiler Wiring for Forced Hot Water
FIGURE 15
20
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Connect Wiring
CONTINUED
21
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Connect Oil Piping
Do not use Teflon tape as an oil
pipe sealant. It can cause valves
to fail, creating hazards. Do not use
General oil piping requirements:
•
Location and installation of oil tanks, oil piping
and burners must follow:
compression fittings.
— NFPA 31, Standard for the Installation of
Oil-Burning Equipment.
— In Canada, CSA B139, Installation of
Oil-Burning Equipment.
•
Underground pipe must be run in a casing to
prevent oil leaking into ground or under floor.
Check local codes for information.
— Local codes and regulations.
— Information provided with burner and
fuel pump.
Oil piping connection at burner:
See FIGURE 16 for recommended connection at
burner, allowing burner mounting door to swing
open completely for servicing.
•
If any part of fuel oil tank is above level of
burner, an anti-siphon device must 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.
•
•
Recommended Oil Piping Connection to Burner
FIGURE 16
22
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Start-Up
Follow information below to
prevent severe personal injury,
death or substantial property damage:
•
When using antifreeze:
Do not use automotive, ethylene
•
•
•
Do not use gasoline 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, 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.
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.
•
•
Never burn garbage or paper in the boiler.
Never leave combustible material around it.
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.
— Follow antifreeze manufacturer’s instructions.
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.
Failure to maintain
recommended pH level can
cause section failure and leaks.
3. Verify burner mounting door is closed tightly
and burner wiring harness is connected to
junction box.
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.
4. Factory burner adjustment and settings may not
be suitable for specific job conditions. See
Appendix, page 25.
b. Repeat with remaining vents.
5. Refill to correct pressure.
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.
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.
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.
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.
6. Check boiler and system piping for leaks. See
“Tips for water systems.”
7. Inspect breeching and venting for proper operation.
•
For pH conditions outside 7.0 to 8.5 range or
unusually hard water areas (above 7 grains
hardness), consult local water treatment company.
23
For additional information, refer to instructions packed with boiler or burner:
•
Burner Manual
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Check-Out Procedure
Check off steps as completed:
J 8. Test additional field-installed controls: If
boiler has a low water cutoff, additional
high limit or other controls, test for
J 1. Boiler and heat distribution units filled
with water?
operation as outlined by manufacturer.
Burner should be operating and should go
off when controls are tested. When controls
are restored, burner should re-ignite.
J 2. Automatic air vent, if used, opened one
full turn?
J 3. Air purged from system? Piping checked
J 9. Limit control set to system temperature
for leaks?
requirements (max. 220°F)?
J 4. Air purged from oil piping? Piping checked
J 10. For multiple zones, flow adjusted to
for leaks?
distribute heat in all zones?
J 5. Flue cap in place and tightened? Burner
door closed, sealed and nut tight? Burner
plugged in and service switch on?
J 11. Thermostat heat anticipator setting (if
available) set properly? Refer to “Connect
wiring,” page 19.
Obtain gas-tight seal to
prevent possible flue gas
leakage and carbon monoxide emissions,
leading to severe personal injury or death.
J 12. 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.
J 6. Proper draft and burner flame? Final
adjustment made with combustion
test equipment?
J 13. Observed several operating cycles for
proper operation?
J 14. Set room thermostat(s) to desired
J 7. Test limit control: While burner is
operating, move indicator 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.
room temperature?
J 15. Completed Installation and Service
Certificate below?
J 16. Reviewed Maintenance and Service Manual
with owner or maintenance person and
instructed person to keep for future reference?
J 17. 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: _________
CP Number(s):______________________________________________
Measured Btu or GPH Input: _____________________________
J Installation instructions have been followed.
J Check-out procedure has been performed.
J Above information is certified to be correct.
J Information received and left with owner/
maintenance person.
Installer:__________________________________________________________________________________________________________________________
(Company) (Address) (Phone)
_________________________________________________________________
24
(Installer’s Signature)
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Appendix
Burner adjustments for “P” and “A” boilers:
To connect WGO boilers to Weil-McLain
PLUS indirect-fired water heaters:
Install and wire per water heater manual provided
with water heater.
Final burner adjustments must be
made using combustion test
equipment to assure proper operation. Do not fire
boiler without water or sections will overheat.
1. Refer to burner manual for start-up.
2. Allow boiler to heat to design condition.
3. Using combustion test equipment, adjust
burner for:
a. CO2 between 11% and 12% and 0 smoke.
b. -0.01" to -0.02" W.C. draft in
combustion chamber.
25
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Appendix
CONTINUED
To provide close clearances as described in pages 26 and 27, Close Clearance Kit,
W-M Part No. 386-500-050, must be obtained and installed 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:
1. Install boiler using clearances described at left.
2. Install barometric control 18-20 inches from
boiler in breeching.
Substitute these instructions for corresponding
material in manual. All other procedures and
practices must remain the same.
3. Attach manual reset temperature switch near
upper surface of enclosed area. See FIGURE 17.
4. Wire switch in series with thermostat. See
FIGURE 18.
Recommended service and minimum clearances
shown on page 4 should be used where possible.
Where closer clearances are required:
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.
•
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.
Doublewall flue pipe to combustible surface —
as listed in Table on page 27 and FIGURES 19
through 21.
•
•
•
Jacket cap must be in place on
boiler to avoid requiring an 18"
minimum clearance from back or top of boiler to
combustible material. Flue pipe clearances must
take precedence over jacket clearances.
Combustible
Surface
Manual Reset
Temperature Switch
#6 x ½" Phil.
Sht. Mtl. Screw
44156
1 to 5
inches
Thermostat
#10 x ½" Phil.
Sht. Mtl. Screw
Manual
Bracket
Reset
Temperature
Switch
Area Above Boiler
Manual Reset Temperature Switch Location
FIGURE 17
Manual Reset Temperature Switch Wiring
FIGURE 18
26
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Appendix
CONTINUED
PROTECTION REQUIRED FOR CLEARANCES LESS
THAN 6 INCHES FROM DOUBLEWALL VENT PIPE*
DIMENSION A
When desired minimum
clearance from type “L”
doublewall vent pipe to
combustible surface is:
Use the following
protection**:
Combustible Surface
A
½" thick insulation board ***
over one-inch glass fiber or
mineral wool batts+
3"
24 gauge sheet metal with
one-inch ventilated air space
6"
6"
2"
3"
Protection
Type “L” Doublewall
Vent Piping
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.
Flue Pipe Clearances
FIGURE 19
** Apply to combustible surface unless otherwise noted. Cover all surfaces as
specified in Table and FIGURE 19. 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.
A
A
24" For Servicing
or Min. 2" for Close
Clearances
A
Combustible
Surface
24" For Servicing
or Min. 2" for Close
Clearances
A
Combustible
Surface
2"
Combustible
Surface
Combustible
Surface
2"
2"
NOTE: 2" Min. on Sides
NOTE: 2" Min. on Sides
Back Vent Clearances
FIGURE 20
Top Vent Clearances
FIGURE 21
27
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Parts List
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.
Fig.
No.
A
B
B
C
D
E
W-M Sales
Description
Regular Front Section 7012
Wide Intermediate Section (WGO-3) 7010
Regular Intermediate Section 7015
Part Number
316-700-250
316-700-075
316-700-065
316-700-070
316-700-265
386-700-852
Intermediate Section w/Draw Rod Lugs 7016
Back Section w/7" Flue, Supply & 2" Return 7017
Section Replacement Kit (For 1 Joint, includes Seals, Rope,Adhesive and
Collector Hood Hardware) Front or Back Section
Section Replacement Kit (For 2 Joints, includes Seals, Rope and Adhesive) Intermediate Section
Section Assembly Complete, For 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
Collector Hood Kit For WGO-2*
Collector Hood Kit For WGO-3*
Collector Hood Kit For WGO-4*
Collector Hood Kit For WGO-5*
Collector Hood Kit For WGO-6*
Collector Hood Kit For WGO-7*
Collector Hood Kit For WGO-8*
386-700-851
386-700-650
386-700-651
386-700-652
386-700-653
386-700-654
386-700-655
386-700-656
386-700-657
386-700-336
386-700-337
386-700-337
386-700-338
386-700-339
450-020-170
450-020-172
450-020-160
560-234-464
560-234-491
560-234-492
560-234-470
560-234-495
560-234-472
560-234-534
560-234-538
560-234-542
560-234-497
386-700-355
386-700-358
330-054-302
330-054-300
386-700-359
591-222-115
460-039-867
590-735-105
590-735-109
F
F
F
F
F
F
F
F
G
G
G
G
G
G
G
G
G
G
H
Collector Hood Kit For WGO-9*
Tie Rod 1/2 x 51/2 (WGO-7, 8, 9)
Tie Rod 1/2 x 103/4 (WGO-2 & 7)
Tie Rod 1/2 x 12 (WGO-7)
Tie Rod 1/2 x 14 (WGO-3, 4, 8, 9)
Tie Rod 1/2 x 15 (WGO-9)
Tie Rod 1/2 x 17 (WGO-5)
Tie Rod 1/2 x 20 (WGO-6)
Tie Rod 1/2 x 231/4 (WGO-7)
Tie Rod 1/2 x 263/8 (WGO-8)
Tie Rod 1/2 x 291/2 (WGO-9)
Combustion Chamber Kit (Rear & Frt. Ref., Door Ref. Blanket, Rope, Blanket & Water Glass)
Burner Mounting Door Assembly (Door, Obs. Port, Rope, Ins. & Pins)
Burner Mounting Door 7070
Door Hinge 7054
Door Refractory
J
K
L
M
N
P
Door Refractory Blanket
Observation Port Shutter
Door Seal Rope 5'
3
Q
/8" Glass Rope For Collector Hood (7' For Largest Size Hood)
R
Flue Cap Assembly (Cap, Strap, Rope & Screws)
Flue Brush 123D
386-700-344
591-706-214
* Includes flue cap assembly, rope and hardware for installation.
28
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Parts Drawing
R
D
E
F
Q
G
B
A
K
H
G
H
H
H
J
N
G
C
L
M
P
29
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Dimensions
1
20 /4 [514.4]
3
1
7 /4
5 /16 [128.6]
[196.9]
9
2 /16 [65.1]
Supply
DIMENSIONS - in.
Air Vent or
Expansion Tank
BOILER
MODEL
NUMBER
B
L
WGO-2
101/2
133/4
5
35 /8
[904.9]
WGO-3
WGO-4
WGO-5
WGO-6
WGO-7
WGO-8
WGO-9
131/2
135/8
167/8
20
167/8
167/8
20
43/8 DIA [111.1]
Burner Opening
Return
231/8
261/4
293¼8
321/2
231/8
261/4
293/8
91/2 [241.3]
7
2 /16
[61.9]
1
1 /8 [28.6]
7
2 /16 [61.9]
WGO Front
3
7 /16
[182.6]
DIMENSIONS - mm.
5
2 /8
[66.7]
BOILER
MODEL
NUMBER
7 DIA
[177.8]
B
L
WGO-2
WGO-3
WGO-4
WGO-5
WGO-6
WGO-7
WGO-8
WGO-9
266.7
342.9
345.9
428.7
508
349.2
428.7
428.7
508.0
587.2
666.7
746.2
825.5
B
1
587.2
666.7
746.2
15 /2
[393.7]
14
Approx.
L
WGO Side with Burner
30
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Dimensions
CONTINUED
Intermediate
7 DIA.
[177.8]
1
6 /4
[158.8]
For 7 DIA. [177.8]
Vent Pipe
9
Alternate Return
(“A” Boilers Only)
29 /16
[750.9]
Back
31
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Ratings
WGO GOLD OIL WATER BOILER RATINGS (1)
ROUND
FLUE
OUTLET
SIZE CONTENT BOILER
IN (7)
DRAFT
LOSS
THRU
I=B=R
BURNER
CAPACITY
GPH (3)
NET
I=B=R
RATINGS
(5)
DOE
SEASONAL
EFFICIENCY %
AFUE
MINIMUM
I=B=R CHIMNEY
BOILER
WATER
BOILER
MODEL
NUMBER
DOE HEATING
CAPACITY (4)
MBH (2)
RECT
ROUND HEIGHT
IN
IN
FT
GAL
IN W.C. (8)
*-WGO-2
*-WGO-3
*-WGO-4
*-WGO-5
*-WGO-6
**-WGO-7
**-WGO-8
**-WGO-9
0.70
0.95
1.20
1.45
1.75
2.00
2.30
2.55
86
75
86.4
85.3
85.0
85.0
85.0
85.0
—
8 x 8
8 x 8
8 x 8
8 x 8
8 x 8
8 x 8
8 x 12
8 x 12
6
6
6
7
7
8
8
8
15
15
15
15
15
15
20
20
7
7
7
7
7
7
7
7
11.0
14.9
13.4
15.9
18.4
20.8
23.3
25.8
.010
.020
.010
.015
.015
.015
.025
.030
115
100
126
152
184
210
231
257
145
175
212
242
266 (6)
295 (6)
—
*
Substitute “P” for completely assembled packaged boiler without burner (WGO-2 through WGO-6 only).
Substitute “A” for boiler only for use with approved burners as listed with I-B=R.
* * Available only as an “A” unit.
(1) WGO boiler designed with convertible vertical and horizontal flue outlet.
(2) MBH refers to thousands of Btu per hour.
(3) Based on 140,000 Btu/gal.
(4) Based on standard test procedures prescribed by the United States Department of Energy at combustion condition of 13.5% CO2 and -0.02" W.C. draft
overfire.
(5) Net I=B=R 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. Consult local Weil-McLain Sales Office.
(6) I=B=R gross output
(7) See page 12 for minimum breeching diameter.
(8) Listed draft losses are for factory-shipped settings.
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