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Part number 550-100-325/0419
3
AquaBalance
®
Series 2 Wall Mount Gas-fired Water Boiler – Boiler Manual
Failure to adhere to the guidelines below can result in severe personal injury, death or substantial property damage.
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 WARN-
ING and instructions on page 86.
Do not block flow of combustion or
ventilation air to boiler.
Should overheating occur or gas supply
fail to shut off, do not turn off or discon-
nect electrical supply to pump. Instead,
shut off the gas supply at a location
external to the appliance.
DO NOT install combustion air intake
where there is a risk of combustion air
contamination.
A carbon monoxide detector that is
wired on the same electrical circuit as
the boiler is strongly recommended.
Provide surge protection in the boiler
power supply. This will reduce the pos-
sibility of damage to the boiler control.
*
In some locations, a carbon monoxide
detector is required by the law.
The heat exchanger is made of stainless
steel, and requires that system water
chemistry be within the limits in this
manual. Use Sentinel X100 inhibitor
in the boiler.
. See
page 75 for details.
Thoroughly flush the system (BEFORE
connecting boiler) to remove sediment.
The high-efficiency heat exchanger can
be damaged by build-up or corrosion
due to sediment.
Do not use petroleum-based cleaning
or sealing compounds in boiler system.
Gaskets and seals in the system may be
damaged. This can result in substantial
property damage.
Continual fresh make-up water will
reduce boiler life. Mineral buildup in
heat exchanger reduces heat transfer,
overheats the aluminum heat exchanger,
and causes failure. Addition of oxygen
carried in by make-up water can cause
internal corrosion. Leaks in boiler or
piping must be repaired at once to
prevent make-up water. Use this boiler
ONLY in a closed-loop system.
Do not add cold water to a hot boiler.
Thermal shock can cause heat exchanger
to crack.
NEVER use automotive or standard
glycol antifreeze. Use only freeze-protec-
tion fluids made for hydronic systems.
Follow all guidelines given by the anti-
freeze manufacturer. Thoroughly clean
and flush any replacement boiler system
that has used glycol before installing the
new boiler Use only the products listed
by Weil-McLain for use with this boiler.
See page 121 for details.
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
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.
— If any 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.
Commonwealth of
Massachusetts
When the boiler is installed within the Commonwealth of Massachusetts:
This product must be installed by a licensed plumber or gas fitter.
If antifreeze is used, a reduced pressure back-flow preventer device shall be used.
Sidewall vent air installations — see instruction on page 18.
— Read all instructions, including this
manual and all other information shipped with the
boiler, before installing. Perform steps in the order
given.
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 136 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.
1 Please read before proceeding
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