Part Number 550-142-300/0520
5
CGa Series 3 Gas-Fired Water Boiler — Boiler Manual
Failure to adhere to the guidelines below can result in severe personal injury, death or substantial property damage.
When servicing boiler —
• To avoid electric shock, disconnect all
electrical supplies to the boiler before
performing maintenance.
• To avoid severe burns, allow boiler to
cool before performing maintenance.
• This boiler contains ceramic fiber
and fiberglass materials. Refer to
the WARNING and instructions on
page 66.
Boiler operation —
• Do not block flow of combustion or
ventilation air to boiler.
• Should overheating occur or gas sup-
ply fail to shut off, do not turn off or
disconnect electrical supply to pump.
Instead, shut off the gas supply at a
location external to the appliance.
Combustion air —
• DO NOT install combustion air in-
take where there is a risk of combus-
tion air contamination.
Boiler water —
• Do not use petroleum-based cleaning
or sealing compounds in boiler sys-
tem. Gaskets and seals in the system
may be damaged. This can result in
substantial property damage.
• Do not use “homemade cures” or
“boiler patent medicines”. Serious
damage to boiler, personnel and/or
property may result.
• Continual fresh makeup water will
reduce boiler life. Mineral buildup in
sections reduces heat transfer, over-
heats cast iron, and causes section
failure. Addition of oxygen and other
gases can cause internal corrosion.
Leaks in boiler or piping must be
repaired at once to prevent makeup
water.
• Do not add cold water to a hot boiler.
Thermal shock can cause heat ex-
changer to crack.
Freeze protection fluids —
• NEVER use automotive or standard
glycol antifreeze. Use only freeze-
protection fluids made for hydronic
systems. Follow all guidelines given
by the antifreeze manufacturer.
Thoroughly clean and flush any re-
placement boiler system that has used
glycol before installing the new boiler
Frozen Water Damage
Hazard
Residences or buildings that are unat-
tended in severely cold weather, boiler
system components failures, power out-
ages, 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 ac-
tion. Consult with your boiler contractor
or a home security agency.
If any part of a boiler, burner or its controls has
been sprayed with or submerged under water,
either partially or fully, DO NOT attempt to op-
erate the boiler until the boiler has been either
replaced or completely repaired, inspected, and
you are sure that the boiler and all components
are in good condition and fully reliable.
Otherwise, by operating this boiler, you will cause
a fire or explosion hazard, and an electrical shock
hazard, leading to serious injury, death, or substan-
tial property damage. See the instructions at right.
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 fresh-
water (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.
Installer
— Read all instructions, including this
manual and all other information shipped with the
boiler, before installing. Perform steps in the order
give no prevent personal injury or death.
User
— This manual is for use only by a qualified
heating installer/service technician. Refer to User’s
Information Manual for your reference.
User
— Have this boiler serviced/inspected by a
qualified service technician, at least annually.
Failure to comply with the above could result in severe
personal injury, death or substantial property damage.
Write in the Consumer Protection (CP) number in
the space provided on the Installation certificate on
page 33 if not already shown.
When calling or writing about the boiler— Please
have the boiler model number from the boiler rating
label and the CP number from the boiler jacket.
Consider piping and installation when determining
boiler location.
Any claims for damage or shortage in shipment
must be filed immediately against the transportation
company by the consignee.
Please read before proceeding
