HOMEOWNER and SERVICE TECHNICIAN — read and follow completely.
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 flue ways 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 com-
pounds 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 hard-
ness), 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 the 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.
Saltwater Damage — The exposure of boiler components to saltwater
can have both immediate and long-term effects. While the immediate
effects of saltwater damage are similar to those of freshwater (shorting
out of electrical components, washing out of critical lubricants, etc.), the
salt and other contaminants left behind can lead to longer term issues
after the water is gone due to the conductive and corrosive nature of
the salt residue. Therefore, Weil-McLain equipment contaminated with
saltwater or polluted water will no longer be covered under warranty
and should be replaced.
Electrical Damage — If any electrical component or wiring came
into contact with water, or was suspected to have come into contact with
water, replace the boiler with a new Weil-McLain boiler.
continued - top of next page
Homeowner —
• For homeowner or person responsible for
simple start-up and routine maintenance of
the system
• Instructions on pages 1 through page 7 must
be followed to assure proper operation of
your boiler. See page 7 for a list of common
problems and possible corrections. In addi-
tion, 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 de-
scribed on page 5.
Service technician —
• For a qualified service technician who has
the necessary equipment to check the boiler
and system performance, and is responsible
for start-up and service of boiler and system.
• All instructions in this manual must be
followed to assure proper operation of this
boiler.
• Annually service boiler and burner to assure
proper operation. See page 29 for service
record.
• Review and explain start-up and routine
maintenance procedures with homeowner.
Follow instructions below to pre-
vent 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 cham-
ber, 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 CON-
TROLS. Always follow specific instructions
when starting up boiler or performing rou-
tine maintenance or service.
Please read before proceeding
Part number 550-142-331/0421
4
WGO OIL-FIRED NATURAL DRAFT WATER BOILER — SERIES 4 — Boiler Manual
