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Part number 550-142-330/0421
4
SGO
OIL-FIRED NATURAL DRAFT STEAM BOILER — SERIES 4 — Boiler Manual
HOMEOWNERandSERVICETECHNICIAN—readandfollowcompletely.
Tips for water systems —
•Check boiler and system piping for leaks. Continual makeup
water will reduce boiler life. Minerals can build up in sec-
tions, reducing heat transfer and causing cast iron to over-
heat, 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 condi-
tions 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.
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 electricalcomponent or wir-
ing
came into contact with water, or was suspected to have
come into contact with water, replace the boiler with a new
Weil-McLain boiler.
Frozen Water Damage Hazard
Residences or buildings that are unattended in severely cold
weather, boiler system components failures, power outages, or
other electrical system failures could result in frozen plumbing
and water damage in a matter of hours. For your protection,
take preventative actions such as having a security system
installed that operates during power outages, senses low
temperature, and initiates an effective action. Consult with
your boiler contractor or a home security agency.
Homeowner —
•For homeowner or person responsible for simple
start-up and routine maintenance of the system.
Instructions on 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 and
Service technician —
•For a qualified service technician who has the nec-
essary 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 36 for service record.
•Review and explain start-up and routine mainte-
nance procedures with homeowner.
Follow instructions below to prevent se-
vere 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 ser-
vice 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
Read this first!
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