Page 1
Aqua Balance
WMB-155C
Wall Mount Gas-Fired
Combination Boiler – Heating and Domestic Hot Water
User’s Information Manual
* Low Lead Content
If the information in this manual is not followed exactly, a fire or explosion may result,
causing property damage, personal injury or loss of life.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance.
— WHAT TO DO IF YOU SMELL GAS —
• Donottrytolightanyappliance.
• Donottouchanyelectricalswitch;donotuseanytelephoneinyourbuilding.
• Immediatelycallyourgassupplierfromaneighbor’stelephone.Followthegassupplier’sinstructions.
• Ifyoucannotreachyourgassupplier,calltheredepartment.
Installation & service must be performed by a qualified installer, service technician or the gas supplier.
Part number 550-100-306/0916
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AquaBalanceTM Wall Mount gas-fired Water boiler — User’s Information Manual
Please read this page first
To . . . Read and use . . . Page
Learn
precautions
Locate boiler
components
Prevent air
contamination
Maintain
boiler
Start — or —
Shutdown
boiler
Understand
control
display
See Hazard Definitions, below
See illustration at right
Laundry room or pool — make sure
boiler air is piped to boiler per manual.
Read list of air contaminants you must
avoid. Have boiler air re-piped to
another location if you can’t avoid.
Set up a plan for maintaining the
boiler using the schedule included in
this manual.
Schedule an annual start-up by a
qualified service technician before
every heating season.
Follow the Operating instruction
sheet details to start or shutdown your
boiler.
This page shows display screen
modes and menu access information.
3
2
4
5
10
11
Boiler Components
Pressure/temperature gauge
Control display
and buttons
Notes
11
Hazard definitions
The following defined terms are used throughout this manual to
bring attention to the presence of hazards of various risk levels or
to important information concerning the life of the product.
Indicates presence of hazards that will cause severe
personal injury, death or substantial property damage.
Indicates presence of hazards that can cause severe
personal injury, death or substantial property damage.
Indicates presence of hazards that will or can cause
minor personal injury or property damage.
Indicates special instructions on installation, operation
or maintenance that are important but not related to
personal injury or property damage.
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.
Boiler Supply
(outlet)
MANUAL GAS VALVE
Condensate drain line
installed here. (Drain line
must be installed by qualified technician, per boiler
manual)
Relief valve
Boiler Return
(inlet)
When calling or writing about the boiler—
Please have the boiler model number from the
boiler rating label and the CP number from the
Relief valve drain line (must be run to safe
drainage location — must be installed by a
qualified technician, per boiler manual).
boiler cabinet.
2
Part number 550-100-306/0916
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AquaBalanceTM Wall Mount gas-fired Water boiler — User’s Information Manual
STOP!! — Read before proceeding
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 operate 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 substantial property damage. See the instructions at right.
Failure to adhere to the guidelines on this page can result in severe personal
injury, death or substantial property damage.
Boiler service and maintenance —
• To avoid electric shock, disconnect electrical supply
before performing maintenance.
• Toavoidsevereburns,allow boiler to cool before
performing maintenance.
• Youmustmaintain the boiler as outlined in the manual
and have the boiler started up and serviced at least
annually by a qualified service technician to
ensure boiler/system reliability.
• Should overheating occur or gas supply
fail to shut off, DO NOT turn off or disconnect
electrical supply to circulator. Instead, shut off the
gas supply at a location external to the appliance.
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
came into contact with water, or was suspected to have come into
contact with water, replace the boiler with a new Weil-McLain boiler.
— If any electrical component or wiring
Water chemistry
Water quality must be maintained as described in boiler
manual.
Water pH between 7.0 and 8.5
1. Maintain boiler water pH between 7.0 and 8.5. Check
with litmus paper or have chemically analyzed by water
treatment company.
2. If pH differs from above, consult local water treatment
company for treatment needed.
Hardness less than 7 grains
1. Consult local water treatment companies for unusually
hard water areas (above 7 grains hardness).
Boiler operation —
• Do not block flow of combustion or ventilation air to boiler.
This boiler is equipped with a control which will automatically shut down the boiler should air or vent be blocked. If
vent or air blockage is easily accessible and removable, remove
it. The boiler should attempt to restart within an hour. If
blockage is not obvious or cannot be removed, have the boiler
and system checked by a qualified service technician.
Combustion air —
• DO NOT obstruct the combustion air intake or
expose the air intake to corrosive chemicals (see
next page).
Carbon monoxide detector —
• A carbon monoxide detector that is wired on the same
electrical circuit as the boiler is strongly recommended.
Boiler water —
• 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.
• Leaks in boiler or piping must be repaired at once
to prevent make-up water. Use this boiler ONLY in
a closed-loop system. Continual fresh make-up water
will reduce boiler life. Mineral buildup in heat exchangers
reduces heat transfer, overheats the materials, and causes
failure. Addition of oxygen carried in by make-up water can
cause internal corrosion.
• Do not add cold water to hot boiler. Thermal shock
can cause heat exchanger to crack.
Chloride concentration must be
LESS THAN 50 ppm
1. Filling with chlorinated fresh water should be acceptable
since drinking water chloride levels are typically less than
5 ppm.
2. Do not use the boiler to directly heat swimming pool or
spa water.
3. Do not fill boiler or operate with water containing chloride
in excess of 50 ppm.
Verify that the water chemistry meets the limita-
tions and requirements of all other equipment
in the system.
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 replacement boiler system
that has used glycol before installing the new boiler.
Antifreeze
1. Use only antifreeze listed by Weil-McLain as suitable for
use with Gas Boilers.
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.
Part number 550-1100-306/0916
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AquaBalanceTM Wall Mount gas-fired Water boiler — User’s Information Manual
Prevent combustion air contamination
Air contamination
Common household and hobby products often contain
fluorine or chlorine compounds. When these chemicals
pass through the boiler, they can form strong acids in
the vent system or boiler. The acid can eat through
the vent or boiler wall, causing serious damage and
presenting a possible threat of flue gas spillage into
the building.
Please read the information on this page.
If the boiler combustion air inlet is
located in any area likely to cause
contamination, or if products which
would contaminate the air cannot be
removed, you must have the combustion air and vent re-piped and
terminated to another location
Contaminated combustion air will dam-
age the boiler, resulting in possible severe
personal injury, death or substantial
property damage.
.
Combustion air contamination:
Ensure that the combustion air will not contain any of
the contaminants in Figure 1
Combustion air supply openings or intake terminations
must NOT be near a swimming pool, for example.
Avoid areas subject to exhaust fumes from laundry facilities.
These areas will always contain contaminants.
Figure 1
Products to avoid
Corrosive contaminants and sources
Spray cans containing chloro/fluorocarbons
Permanent wave solutions
Chlorinated waxes/cleaners
Chlorine-based swimming pool chemicals
Calcium chloride used for thawing
Sodium chloride used for water softening
Refrigerant leaks
.
Do not operate the boiler if its
combustion air inlet is located in
a laundry room or pool facility
, for
example. These areas will always contain
hazardous contaminants.
Paint or varnish removers
Hydrochloric acid/muriatic acid
Cements and glues
Antistatic fabric softeners used in clothes dryers
Chlorine-type bleaches, detergents, and cleaning solvents found in
household laundry rooms
Adhesives used to fasten building products and other similar products
Excessive dust and dirt
Areas likely to have contaminants
Dry cleaning/laundry areas and establishments
Swimming pools
Metal fabrication plants
Beauty shops
Refrigeration repair shops
Photo processing plants
Auto body shops
Plastic manufacturing plants
Furniture refinishing areas and establishments
New building construction
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Part number 550-100-306/0916
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AquaBalanceTM Wall Mount gas-fired Water boiler — User’s Information Manual
Annual startup and general maintenance
Figure 2 Service and maintenance schedules
OWNER MAINTENANCE (see the following pages for instructions)
Contact your boiler service technician to inspect, service and start
BEGINNING OF SEASON
DAILY
up your boiler. You must have an annual start-up performed by
a qualified service technician to ensure reliable operation of the
boiler and system.
• Check boiler area.
• Check air openings.
• Check pressure/temperature gauge.
MONTHLY
EVERY 6 MONTHS
• Verify boiler jacket door is securely closed.
• Check vent piping.
• Check air piping.
• Check relief valve.
• Check condensate drain system.
• Check automatic air vents (if used).
• Check display date and time.
• Check boiler piping (gas and water).
• Operate relief valve.
Follow the service and maintenance procedures given throughout this manual and in component literature
shipped with the boiler. Failure to perform the service and maintenance could result in damage to the boiler or
system. Failure to follow the directions in this manual and component literature could result in severe personal
injury, death or substantial property damage.
Part number 550-1100-306/0916
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AquaBalanceTM Wall Mount gas-fired Water boiler — User’s Information Manual
Annual startup and general maintenance
FIRST-YEAR SPECIAL INSPECTION
1. No later than 12 months after the boiler is installed, perform a
first-year inspection of the boiler. This should include the following
in addition to routine annual start-up procedures.
a. The integrity of the flue system and the flue seals.
b. The integrity of the boiler combustion circuit and the relevant
seals.
c. The operational (working) gas inlet pressure at maximum rate,
as described in the boiler manual.
d. The gas rate, as described in the boiler manual.
e. The combustion performance, as described in the boiler
manual for combustion check.
f. Competence to carry out the check of combustion performance.
g. The person carrying out a combustion measurement should
have been assessed as competent in the use of a flue gas analyzer
and the interpretation of the results.
Periodical check
h. To keep the unit working properly over time, it is necessary to have
qualified personnel make an annual check that includes the following tests:
i. The control and safety devices (gas valve, flow meter, thermostats,
etc.) must function correctly.
j. The flue pipes must be fully intact, secure and clear.
k. The airtight chamber must be sealed.
l. The air-flue terminal and ducts must be free of obstructions and leaks.
m. The condensate evacuation system must be efficient with no leakage
or obstructions and drain condensate without backing up.
n. The burner and exchanger must be clean and free of scale. When
cleaning, do not use chemical products or wire brushes.
o. The electrode must be free of scale and properly positioned.
p. The gas and water systems must be leak free.
q. The water pressure in the heating system must be about 18 pounds;
fill the boiler to that pressure or the system design pressure.
r. The circulation pump must not be blocked.
s. The expansion tank must be filled.
t. The gas flow and pressure must correspond to that given in the
respective tables.
2. Determine any follow-up maintenance and service needs based on
the condition of the heat exchanger and condensate lines.
a. If the heat exchanger shows substantial fouling, or if condensate lines
show accumulation of sediment, schedule a follow-up service call
to perform the first-year inspection again, sooner than the normal
twelve months between.
b. Heavy fouling of the exchanger or condensate lines indicates possible
combustion air contamination. Inspect the air intake area carefully,
and remove possible contaminants. See page 4, for products to avoid.
Youmusteliminatecausesofcorrosionandcontamina-
tion to ensure reliable operation of the boiler and system.
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Part number 550-100-306/0916
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AquaBalanceTM Wall Mount gas-fired Water boiler — User’s Information Manual
User maintenance procedures
The boiler should be inspected and started annually, at the beginning of the heat-
Boiler must
be serviced and
maintained
ing season, only by a qualified service technician. In addition, the maintenance
and care of the boiler designated on page 5 and explained on the following pages
must be performed to assure maximum boiler efficiency and reliability. Failure
to service and maintain the boiler and system could result in equipment failure,
causing possible severe personal injury, death or substantial property damage.
The following information provides detailed instructions for completing the
maintenance items listed in the maintenance schedule, page 5. In addition to
this maintenance, the boiler must be serviced and started up at the beginning of
each heating season by a qualified service technician.
DAILY
Maintenance
Check boiler area
To prevent potential of se-
vere personal injury, death or
substantial property damage,
eliminate all materials discussed below from the boiler
vicinity. If contaminants are
found:
Remove products immediately
from the area. If they have been
there for an extended period,
call a qualified service technician to inspect the boiler and
vent system for possible damage from acid corrosion.
If products cannot be removed,
immediately call a qualified
service technician to address
the problem.
1. Combustible/flammable materials — Do
not store combustible materials, gasoline
or any other flammable vapors or liquids
near the boiler. Remove immediately if
found.
2. Air contaminants — Products containing
chlorine or fluorine, if allowed to contaminate the boiler intake air, will cause
acidic condensate in the vent and boiler.
This will cause significant damage to the
vent and/or boiler if allowed to continue.
3. Read the list of potential materials listed
on page 4 of this manual. If any of these
products are in the room from which
the boiler takes its combustion air, they
must be removed immediately or the
boiler combustion air must be supplied
from outside.
4. See WARNING above.
Check air openings
1. Verify that combustion and ventilation
air openings to the boiler room and/or
building are open and unobstructed.
2. Verify that boiler vent discharge and air
intake are clean and free of obstructions.
Remove any debris on the air intake or
flue exhaust openings.
Check boiler pressure/
temperature gauge
1. Make sure the pressure reading on the
boiler pressure/temperature gauge does
not exceed 24 psig. Higher pressure may
indicate a problem with the expansion
tank.
2. Contact a qualified service technician if
problem persists.
Verify that boiler jacket
door is securely closed
1. Visually inspect boiler jacket door to be
sure it is sealed all around its perimeter.
Verify that the two door screws are tight.
The boiler jacket door must be
securely fastened to the boiler
to prevent boiler from drawing
air from inside the boiler room.
Screws should be hand tight.
This is particularly important if
the boiler is located in the same
room as other appliances.
Failure to keep the door se-
curely fastened could result in
severe personal injury or death.
Contact your installer or tech-
nician immediately if the front
door does not close correctly or
if the door gaskets are damaged.
Part number 550-1100-306/0916
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AquaBalanceTM Wall Mount gas-fired Water boiler — User’s Information Manual
User maintenance procedures (continued)
MONTHLY
Maintenance
Check vent & air piping
1. Visually inspect the flue gas vent piping
and air piping for any signs of blockage,
leakage or deterioration of the piping.
Notify your qualified service technician
at once if you find any problem.
Failure to inspect the vent/air
system as noted above and have
them repaired by a qualified
service technician can result
in vent system failure, causing
severe personal injury or death.
Check the relief valve
1. Inspect the boiler relief valve and the relief
valve discharge pipe for signs of weeping
or leakage.
2. If the relief valve often weeps, the expansion tank may not be working properly.
Immediately contact your qualified service technician to inspect the boiler and
system.
Check the condensate drain
system
1. Visually inspect the condensate drain
tubing and the end of the tube. Make sure
the tube is in good condition and that
condensate can run freely.
2. Inspect the boiler condensate trap, located
under the boiler (see Figure 3). Check for
any sediment and clean out if necessary.
Make sure the trap has water in it.
3. Contact a boiler service technician if you
observe any problems.
Figure 3 Boiler condensate trap
Cap gasket
Condensate
drain line
Contact a boiler service technician
immediately if you find the trap dry
(no water inside).
Clean out cap
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Part number 550-100-306/0916
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AquaBalanceTM Wall Mount gas-fired Water boiler — User’s Information Manual
User maintenance procedures (continued)
EVERY
6 MONTHS
Maintenance
Check boiler piping
1. Check all gas lines and smell for gas
odors. Perform gas leak inspection per
steps 1 through 7, Operating Instructions,
page 10. If gas odor or leak is detected,
immediately shut down boiler following
procedures on page 10. Call a qualified
service technician.
2. Visually inspect for water leaks around
all piping, circulators, relief valves and
other fittings.
3. Immediately call a qualified service technician to repair any leaks.
Have leaks fixed at once by a
qualified service technician.
Continual fresh makeup water
will reduce boiler life. Minerals
can build up in the heat exchanger, reducing heat transfer
and causing overheating. Heat
exchanger failure can occur.
Do not use petroleum-
based cleaning or sealing
compounds
Severe damage to boiler and
system components can occur,
resulting in possible severe
personal injury, death or substantial property damage.
in boiler system.
Operate boiler relief valve
1. Before proceeding, verify that the relief
valve outlet has been piped to a safe place
of discharge, avoiding any possibility of
scalding from hot water.
3. Lift the relief valve top lever slightly, allowing water to relieve through the valve
and discharge piping.
4. If water flows freely, release the lever and
allow the valve to seat. Watch the end of
the relief valve discharge pipe to ensure
that the valve does not weep after the line
has had time to drain. If the valve weeps,
lift the seat again to attempt to clean the
valve seat. If the valve continues to weep
afterwards, contact your qualified service
technician to inspect the valve and system.
5. If water does not flow from the valve
when you lift the lever completely, the
valve or discharge line may be blocked.
Immediately shutdown the boiler, following the lighting instructions on the
inside jacket top. Call your qualified
service technician to inspect the boiler
and system.
To avoid water damage or scald-
ing due to valve operation, a
metal discharge line must be
connected to relief valve outlet and run to a safe place of
disposal. This discharge line
must be installed by a qualified heating installer or service
technician in accordance with
the instructions in the Boiler
Manual
must be terminated so as to
eliminate possibility of severe
burns should the valve discharge.
. The discharge line
Part number 550-1100-306/0916
2. Read the boiler pressure/temperature
gauge to make sure the system is pressurized.
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AquaBalanceTM Wall Mount gas-fired Water boiler — User’s Information Manual
OPERATING INSTRUCTIONS
Figure 4 Operating instructions (see page 2 for location of manual gas valve)
10
Part number 550-100-306/0916
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AquaBalanceTM Wall Mount gas-fired Water boiler — User’s Information Manual
CONTROL INTRODUCTION
Control Introduction
This boiler is a high-efficiency condensing pre-mix appliance for
central heating and hot water production, running on Natural
gas or Liquefied Petroleum (Propane) gas, generating extremely
low emissions.
The boiler is constructed with a stainless steel heat exchanger
providing effective condensation of the water vapor contained
in the flue gases, permitting extremely high efficiency.
Inside the boiler there is a premix burner with a large stainless
steel surface.
The boiler is sealed from the installation room: the air needed
for combustion is drawn from outside. The boiler also includes
a gas valve, pump, safety valve, flow sensor, dual safety and
control temperature sensor, a safety thermostat and a low water
pressure switch.
Thanks to the microprocessor control and adjustment system
with advanced self-diagnosis, unit operation is for the most part
automatic. The system heating temperature is automatically
governed by the control system.
The display continuously provides information on the unit’s
operating status and it is easily possible to obtain and adjust
temperature set-points, etc. or configure them. Any operating
problems associated with the boiler are immediately signalled by
the display and, if possible, corrected automatically.
Figure 5 Control module
LEGEND for Figure 6
1 — Domestic Hot Water temperature setpoint decreasing button
2 — Domestic Hot Water temperature setpoint increasing button
3 — Central Heating water temperature setpoint decreasing
button
4 — Central Heating water temperature setpoint increasing button
5 — LCD Display
6 — Reset / OTC button
7 — Economy-Comfort On-Off -Power button
8 — Domestic Hot Water symbol
Part number 550-1100-306/0916
9 — Domestic Hot Water mode operation
11 — Multi-function indication (Flashing during heat
exchanger protection)
12 — Economy symbol
13 — Central Heating mode operation
14 — Central Heating symbol
15 — Burner on and actual load indication (Flashing during
flame current supervision)
16 — Temperature-Pressure gauge
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AquaBalanceTM Wall Mount gas-fired Water boiler — User’s Information Manual
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Part number 550-100-306/0916
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