Carrier BWCAAG000120 Manual

9 WARNING: If the information in this manual
is not followed exactly, a re or explosion may
result causing property damage, personal
injury or loss of life.
Do not store or use gasoline or other ammable
vapors and liquids or other combustible materials
in the vicinity of this or any other appliance. To
do so may result in an explosion or re.
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call the
re department.
Installation and service must be performed by
a qualied installer, service agency or the gas
supplier.
This manual should be maintained in legible
condition and kept adjacent to the boiler or
in a safe place for future reference.
CAC/BDP
7310 West Morris St
Indianapolis - IN 46231
USA
BWCAAG000120 - BWCAAG000150
BWHAAG000120 - BWHAAG000150
INSTALLATION & OPERATING INSTRUCTIONS FOR CONTRACTORS
BWC-H-01SI 07/2020

2
CONTENTS
1 KEY TO SYMBOLS ...................... 3
2 WARNINGS........................... 3
2.1 Ratings and Certications .......................3
2.2 Regulations and guidelines ......................3
2.3 General warnings..............................3
3 SAFETY .............................4
3.1 General safety ................................4
3.2 Scalding time/temperature relationships ............4
4 PRODUCT RECEIPT ......................5
4.1 Model Identication ............................5
4.2 Boiler box content .............................5
4.3 Installation at elevation .........................5
5 INTRODUCTION ........................5
5.1 Structure ....................................6
5.2 Boiler front control .............................8
5.3 Technical data ................................9
5.4 Hydraulic circuit ..............................13
5.5 Dimensions and connections....................15
6 BEFORE INSTALLATION .................. 16
6.1 Installations must comply with: ..................16
6.2 Before locating the boiler .......................16
6.3 Clearances for service access...................16
6.3.1 Exhaust vent and intake air vent .................16
6.4 Prevent combustion air contamination.............17
6.5 When removing an existing boiler from an existing
common vent system..........................17
6.6 Prepare the boiler ............................17
7 INSTALLATION .........................17
7.1 Wall mounting information ......................17
7.1.1 Placing the wall-mounted boiler..................17
7.2 Boiler template...............................18
7.2.1 Installation steps .............................18
7.3 ASME pressure relief valve .....................19
7.4 Installing the condensate check valve .............19
7.5 Loose ow regulators .........................20
7.6 General piping information......................20
7.6.1 Separate low water cutoff ......................20
7.6.2 Backow preventer (heating only model)...........20
7.6.3 Fitting the heating circuit supply and return pipes ....20
7.6.4 Sizing space heat system piping .................20
7.6.5 Available Pump Head (ft. hd.) ...................20
7.7 Making the gas connection .....................21
7.7.1 Electrical supply..............................21
7.8 External wiring limitations ......................22
7.9 Electrical connections .........................22
7.9.1 OT and Room Thermostat connection to the boiler...23
7.10 Outdoor temperature sensor ....................23
7.11 KBAIR0101BE9 / pump card management (BE09) ...23
7.12 Other devices................................23
7.13 Check/control water chemistry...................24
7.14 Freeze protection (when used) ..................24
7.15 Casing removal ..............................24
7.16 Initial lling of the system and air purge............24
7.17 Rell of the system ...........................25
7.18 Draining the heating circuit of the boiler ...........25
7.19 Emptying the domestic hot water system ..........25
8 GENERAL VENTING..................... 26
8.1 Combustion Air-inlet Contamination ..............26
8.2 Flammable Solvents and Plastic Piping............26
8.3 Mandatory Pre-commissioning Procedure for PVC
(Air-inlet only) and CPVC Plastic Venting ..........26
8.4 General Venting Rules and Guidelines ............26
8.5 Combustion Air and Ventilation Openings ..........28
8.5.1 NearBoiler Vent/Air-inlet Piping ..................33
8.6 Connecting ue gas accessories .................33
8.6.1 Installing of the exhaust and air intake system ......33
8.7 Vent and combustion air pipe length .............33
8.8 Approved congurations of horizontal and vertical
venting installation ............................33
8.9 Multi Family boiler installation ...................38
9 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . 39
9.1 Electrical diagram ............................39
9.2 Ladder diagram ..............................41
10 LIGHTING INSTRUCTIONS................. 43
11 COMMISSIONING ...................... 44
11.1 Preliminary checks............................44
11.2 Instructing the user ...........................44
11.3 Initial ushing of the system.....................44
11.4 Bleeding and Releasing of Circulator Shaft.........44
11.5 Programming the boiler ........................44
11.6 First commissioning ...........................45
11.7 Adjusting the heating water temperature without an
outdoor temperature sensor connected............46
11.8 Adjusting the heating water temperature with an
outdoor temperature sensor connected............46
11.9 Adjustment of the domestic hot water temperature ...46
11.10 Access to the INFO menu ......................47
11.11 Access to the PARAMETER menu ...............47
11.11.1 Hydraulic conguration.......................49
11.11.2 Sliding outlet (heating only boiler) ..............49
11.11.3 Heating timer ..............................49
11.11.4 Domestic hot water thermostat (combi boiler only) . 49
11.11.5 System ...................................49
11.11.6 Preheating (combi boiler only) .................49
11.11.7 Minimum CH setpoint........................49
11.11.8 Maximum CH setpoint .......................49
11.11.9 Minimum DHW setpoint ......................49
11.11.10 Maximum DHW setpoint......................50
11.11.11 Reset ue hour counter ......................50
11.11.12 Auxiliary output.............................50
11.11.13 Night Setback and Outdoor Reset Correction .....50
11.11.14 CALL FOR SERVICE ........................50
11.12 Setting the outdoor reset curve with an outdoor sensor 5 0
11.13 Checks during and after the rst commissioning .....51
11.14 Converting the boiler gas type ..................51
11.15 Combustion analysis ..........................52
11.16 Lights and faults/Reset procedure................52
11.17 Temporary switch-off ..........................54
11.18 Switching off for long periods....................54
11.19 Replacing of the PCB board ....................54
11.20 Remote devices presence .....................54
12 SERVICING INSTRUCTIONS . . . . . . . . . . . . . . . . 55
12.1 General ....................................55
12.2 Maintenance ................................55
12.3 Maintenance program .........................55
12.4 Maintenance of the combustion control system ......56
12.4.1 Flame sensor................................56
12.4.2 Gas valve...................................57
12.4.3 Burner .....................................57
12.4.4 Burner door .................................57
12.4.5 Heat exchanger ..............................57
12.5 Annual servicing check list......................59
Document Specic Type Model Number Language New Literature Number
Installation BWC - BWH English BWC-H-01SI
Owner's Manual BWC - BWH English OG-BWC-H-01
Warranty BWC - BWH English 39004DP565
Installation BWC - BWH French-Canadian BWC-H-01SIFR
Owner's Manual BWC - BWH French-Canadian OG-BWC-H-01FR
Warranty BWC - BWH French-Canadian 39004DP565FR

3
1 KEY TO SYMBOLS
This 9 is the safety−ale rt symbol. When you see this symbol on
the appliance and in instructions or manuals, be alert to the potential
for personal injury.
Understand the signal words DANGER, WARNING, and CAUTION.
These words are used with the safety−alert symbol.
DANGER identies the most serious hazards which will result in
severe personal injury or death.
WARNING signies a hazard which could result in personal injury
or death.
CAUTION is used to identify hazards which may result in minor
personal injury or product and property damage.
NOTE and NOTICE are used to highlight suggestions which will
result in enhanced installation, reliability, or operation.
2 WARNINGS
2.1 Ratings and Certications
−Gas red hot water boiler for either direct vent installation. Design
according to: ANSI Z21.13-2017 ● CSA 4.9-2017 – Gas-Fired low
pressure hot water boilers. Direct vent boiler, Category IV.
− SCAQMD Rule 1146.2
9
WARNING: Altering any pressure vessel by installing replacement
heat exchangers, or any ASME parts not manufactured and/or
approved by the manufacturer will instantly void the ASME and
CSA ratings and any warranty on the vessel. Altering the ASME or
CSA ratings of the vessel also violates national, state, and local
approval codes.
Combi models are certied to NSF/ANSI 372-2016 - Low lead
content certication program - plumbing products and conform to the
requirements for “lead free” plumbing products.
2.2 Regulations and guidelines
The installation must conform to the requirements of the authority
having jurisdiction or, in the absence of such requirements, to the
latest edition of the National Fuel Gas Code, ANSI Z223.1/NFPA 54.
In Canada, installation must be in accordance with the requirements of
CAN/CSA B149.1, Natural Gas and Propane Installation Code. Where
required by the authority having jurisdiction, the installation must conform
to the Standard for Controls and Safety Devices for Automatically Fired
Boilers, ANSI/ASME CSD-1.
Install CO detectors per local regulations. The use of a carbon monoxide
detector in conjunction with the manufacturer heating products is
required. When installing a carbon monoxide detector, the manufacturer’s
instructions of the carbon monoxide detector must be followed in their
entirety. It is recomm
ended to use a carbon monoxide detector in compliance
with a nationally recognized standard such as ANSI/UL 2034-2002 in the United
States and CSA 6.19-01 in Canada.
Boilers require yearly maintenance, see chapter “12.2 Maintenance” page 55”.
2.3 General warnings
9
DANGER: Make sure the gas on which the boiler will operate is
the same type as that specied on the boiler rating plate and on
the colored sticker near the boiler gas connection.
9
WARNING: This product is a gas appliance that emits poisonous
gases; such as CO (Carbon Monoxide). For this reason, it is
required that CO detectors be installed in buildings where the boiler
is installed. Failure to do so may result in severe injury or death.
9
WARNING: Should overheating occur or the gas supply valve fail
to shut off, turn off the manual gas control valve to the appliance.
9
WARNING: Do not use this boiler if any part has been under water.
Immediately call a qualied service technician to inspect the boiler
and to replace any part of the control system and any gas control
which has been under water.
Legend model terminology:
BWC = combi boiler
BWH = heating only boiler
9
WARNING: Chlorine and chloramine concentration in domestic
water must be less than 50 ppm.
9
WARNING: Automatic lling systems are not recommended with
this product as they will continually add fresh water to the system
if there is a leak resulting in the addition of new contaminants that
could reduce the lifespan of the boiler.
9
WARNING: To minimize the possibility of improper operation,
serious personal injury, re, or damage to the boiler:
−Always keep the area around the boiler free of combustible materials,
gasoline, and other ammable liquids and vapors.
−Boiler should never be covered or have any blockage to the ow of
fresh air to the boiler.
9
WARNING: Risk of electrical shock. More than one disconnect
switch may be required to de-energize the equipment before
servicing. Failure to comply with the above could result in severe
personal injury, death or substantial property damage.
9
WARNING: Failure to adhere to the guidelines on this page can
result in severe personal injury, death or substantial property
damage.
9
WARNING: Installation and service must be performed by a gas
supplier or a licensed qualied installer/service Technician.
9
WARNING - CALIFORNIA PROPOSITION 65: This product
contains chemicals known to the State of California to cause
cancer, birth defects or other reproductive harm.
9
CAUTION: This boiler requires forced water circulation when the
burner is operating. See minimum and maximum ow rates. Severe
damage will occur if the boiler is operated without proper water ow
circulation.
NOTICE: Minimum 20 AWG, 194°F (90°C), solid thermostat wire must
be used for all low voltage (less than 30 volts) external connections to
the unit. Install conduit as appropriate.
NOTICE: When the boiler has been lled for the rst time or the system
has been drained and relled, it will be necessary to release any air that
may have become trapped within the appl
iance heat exchanger. Loo-
sen the bleed screw until water is released and then close. IMPOR-
TANT, THERE ARE NO OTHER MANUAL AIR RELEASE VALVES
LOCATED ON THE APPLIANCE.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Have a re extinguisher available. Read these in-
structions thoroughly and follow all warnings or cautions included in
literature and attached to the appliance.
This product is approved for construction use provided they are installed
in-accordance with this manual, the requirements of the authority having
jurisdiction as well as either the National Fuel Gas Code, ANSI Z223.1/
NFPA 54 in the United States or CAN/CSA B149.1, Natural Gas and
Propane Installation Code in Canada.
The product must be installed indoors and be protected from
environmental elements. The building envelope must be sealed
completely and have a nished roof. Unnished openings, such as
windows and doors, must be temporarily sealed with plastic sheeting
material as a minimum.
The following instructions must be observed
−The boiler must only be used for its designated purpose, observing
the Installation Instructions.
−Only use the boiler in combinations and with the accessories and
spare parts listed.
−Other combinations, accessories and consumables must only be
used if they are specically designed for the intended application and
do not affect the system performance and the safety requirements.
−Maintenance and repairs must only be carried out by authorized
professionals.
−You are only allowed to operate the condensing gas boiler with the
combustion air/ue gas system that has been specically
designed
and approved for this type of boiler.
−Please note that local permission for the ue system and the condensate
water connection to the public sewer system may be required.
−The hot water distribution system must comply with all applicable codes

4
and regulations. When replacing an existing boiler, it is important to
check the condition of the entire hot water distribution system to ensure
safe operation.
You must also observe:
−The local building regulations stipulating the installation rules.
−The local building regulations concerning the air intake and outlet
systems and the chimney connection.
−The regulations for the power supply connection.
−The technical rules laid down by the gas utility company concerning the
connection of the gas connection to the local gas main.
−The instructions and standards concerning the safety equipment for
the water/space heating system.
−The Installation instructions for building heating systems.
−The boiler must be located in an area where leakage of the tank
or connections will not result in damage to the area adjacent to the
boiler or to lower oors of the structure. When such locations cannot
be avoided, it is recommended that a suitable drain pan, adequately
drained, be installed under the boiler. The pan must not restrict
combustion air ow.
−The boiler must be installed such that the gas ignition system
components are protected from water (dripping, spraying, rain etc.)
during boiler operation and service (circulator replacement, condensate
trap, control replacement, etc.).
−The boiler must not be installed on carpeting.
−The boiler must only be installed on a wall.
−Do not restrict or seal any air intake or outlet openings.
−If you nd any defects, you must inform the owner of the system of the
defect and the associated hazard in writing.
9
DANGER: Flammable gas explodes. Beware if you smell gas: there
may be an explosion hazard.
9
WARNING: If the information in these instructions is not followed
exactly, a re or explosion may result causing property damage,
personal injury or death.
9
WARNING: Do not store or use gasoline or other ammable vapors
and liquids in the vicinity of this or any other boiler. Doing so may
result in an explosion or re.
Observe these instructions as general warnings:
−Chemicals used to clean the system and/or inhibit corrosion must be
pH neutral, i.e. they should ensure that the level of the pH in the system
water remains neutral. Premature failure of certain components can
occur if the pH level in the system water is out of normal range.
−The manufacturer recommends that an inhibitor - suitable for use
with stainless steel heat exchangers - is used to protect the boiler
and system from the effects of corrosion and/or electrolytic action.
The inhibitor must be administered in strict accordance with the
manufacturers instructions.
−When the boiler has been lled for the rst time or the system has been
drained and relled, it will be necessary to purge any air that may have
become trapped within the appliance heat exchanger.
NOTICE: Propylene glycol in the system must not exceed 40%.
Boiler water
-If you have an old system with cast iron radiators, thoroughly ush the
system (without the boiler connected) to remove sediment. The high-
efciency heat exchanger can be damaged by build-up or corrosion
due to sediment.
-Do not use petroleum-based cleaning or sealing compounds in the
boiler system. 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.” Substantial
property damage, damage to boiler, and/ or serious personal injury
may result.
-Continual fresh make-up water will reduce boiler life. Mineral build up
in heat exchanger reduces heat transfer, overheats the stainless steel
heat exchanger, and causes failure. Addition of oxygen carried in by
make-up water can cause internal corrosion in system components.
Leaks in the boiler or piping must be repaired at once to prevent make-
up water.
-We recommend the use of water treatment additives to prolong the life
of the boiler and prevent against corrosion and contaminant build ups
in the heating system.
-Ensure piping in the heating system has an oxygen barrier.
Observe these instructions for space heating water:
−Thoroughly ush the system prior to lling. Only use untreated potable
water to ll and top off the system.
−Do not use water softeners in the system.
−The maximum permissible ow rate of the 120k BTU/h is 3.7 gallons per
minute (GPM) and of the150k BTU/h is 3.96 gallons per minute (GPM).
−When using oxygen-permeable pipes, e.g. for oor heating systems, you
must separate the system using heat exchangers. Unsuitable heating
system water promotes the formation of sludge and corrosion. This may
damage the heat exchanger or affect its operation.
Tools, materials and additional equipment
For the installation and maintenance of the boiler you will need the
standard tools for space heating, gas and water connection.
In addition, a handtruck with a fastening belt is very useful.
Disposal:
−Dispose of the boiler packaging in an environmentally sound manner.
−Dispose of components of the heating system (e. g. boiler or control
device), that must be replaced, by taking them in to an authorized
recycling facility.
3 SAFETY
3.1 General safety
To meet domestic hot water use needs, the high limit safety control on
this boiler is adjustable up to 140°F (60°C). Water temperatures over
125°F (52°C) can cause instant severe burns or death from scalds.
When supplyi ng general purpose hot water, the recommended
initial setting for the temperature control is 120°F (49°C).
Safety and energy conservation are factors to be considered when
setting the water temperature on the thermostat. The most energy-
efcient operation will result when the temperature setting is the
lowest that satises the needs of the application.
Children, disabled and elderly are at highest risk of being scalded.
− Feel water before bathing or showering.
− Temperature limiting valves are available.
NOTICE (for heating only model): When this boiler is
supplying general purpose hot water for use by individuals, a
thermostatically controlled mixing valve for reducing point of
use water temperature is recommended to reduce the risk of
scald injury. Contact a licensed plumber or the local plumbing
authority for further information.
Maximum water temperatures occur just after the boiler’s burner
has shut off. To determine the water temperature being delivered,
turn on a hot water faucet and place a thermometer in the hot water
stream and read the thermometer.
9 Only for heating only model
WARNING: This boiler cannot supply hot water for use
by individuals directly. A heat exchanger must be used in
conjunction with this boiler to meet DHW needs.
3.2 Scalding time/temperature relationships
The following chart details the relationship of water temperature
and time with regard to scald injury and may be used as a guide
in determining the safest water temperature for your applications.
Water Temperature Time to Produce Serious
Burn
120°F (49°C) More than 5 minutes
125°F (52°C) 1-1/2 to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
150°F (66°C) About 1-1/2 seconds
155°F (68°C) About 1 second
Table courtesy of The Shriners Burn Institute.
The temperature of the water in the boiler can be regulated by
using the boiler front control. To comply with safety regulations, the
control is set to a lower temperature when shipped from the factory.
CAUTION: Hotter water increases the risk of scalding! There is a
hot water scald potential if the thermostat is set too high.

5
4 PRODUCT RECEIPT
4.1 Model Identication
The model identication number and boiler serial number are found
on the boiler rating plate located on the bottom side of the unit. Also
the boiler serial number can be found on the front of the boiler casing .
4.2 Boiler box content
Component Qty
1Condensing gas boiler 1
2 Wall bracket 1
3Pressure relief valve ASME 1
4 Condensate check valve 1
5 Gas cock 1
6
Condensate check valve gasket 1
Pressure relief valve gasket 1
Spare modulating gas valve gasket 1
7
Strain relief for secondary high voltage connexion:
- BWCAAG000120-150
- BWHAAG000120-150
1
2
8 Set of documents for appliance 1
9Vent adaptor Ø 3” (80 mm), L=6” (155 mm) for
concentric Ø 3/5” (80/125 mm) - see section 8.8 g.4 1
10 Vent adaptor Ø 2” (60 mm), L= 5 5/16” (135 mm) for
concentric Ø 2/4” (60/100mm) - see section 8.8 g.1 1
11 Outdoor temperature sensor 1
12 Flexible tube for condensate drain (external) all models
1
13
Additional (loose) ow regulators:
for 150 combi Olive Green 13.0 l/min and Gray 18.0 l/min 2
for 120 combi Blue 10.0 l/min and Dark blue 16.0 l/min 2
14
Paper template (see “7.2 Boiler template”) 1
Lighting Instructions (see Section “10 LIGHTING
INSTRUCTIONS” page 43) 1
Warning Label (see Section “10 LIGHTING
INSTRUCTIONS” page 43) 1
LP Gas Conversion Sticker 1
2
33
4
5
6
7
9
10
8
1
14
11
12
13
4.3 Installation at elevation
Rated inputs are suitable for up to 10,000 ft (3048 m) elevation
(see technical data table).
No hardware changes are required to the boilers for installations up
to 10,000 ft (3048 m) (adjustments are required).
For additional settings on high altitude installations refer to your
local distributor.
5 INTRODUCTION
The boilers have a new automatic combustion control system.
This new control system ensures functionality, efciency and low
emissions under any conditions.
This system uses an ionization sensor (ame sensor)immersed in
the burner ame, whose information allows the control board to
operate the gas valve that regulates the fuel.
This sophisticated control system provides the auto-regulation
of the combustion, so there is no need for an initial calibration;
however, it is recommended (required in some jurisdictions) that a
combustion analysis is performed during initial start-up and annual
maintenance.
This system is able to adapt the boiler to operate with different
gas compositions, different air inlet and exhaust vent lengths and
different altitudes (within the specied design limits).
This system can also perform an auto-diagnostic operation that
locks out the burner before the permitted upper emission limit is
exceeded.
BWC and BWH are wall hung fan assisted room-sealed condensing
boilers.
The BWC combi is a direct vent, CAT IV wall mounted boiler for
heating and prodution domestic hot water.
The BWH heating only is a direct vent, CAT IV wall mounted boiler
that is able to operate as follows:
- CASE A: heating only with tank thermostat: in this condition, the
boiler delivers hot water to the water tank whenever a demand
is made by the relative thermostat.
- CASE B: heating only with tank sensor and sliding outlet: in this
case, the outlet setpoint in a DHW request is no fixed at 120°F
(49°C) but variable (default for BWH model)
- CASE C: heating only with tank sensor and xed outlet: this
setting performs a modulation to a fixed outlet value of 120°F
(49°C) when there is a DHW request.
The water heater is not supplied by our company, make sure that
the relative indirect tank sensor (NTC sensor) has the following
characteristics: 10 kOhm at 77°F (25°C), B 3435 ±1%. The kit
KBANT0101111 is available for purchase.
These appliances are designed for use with a sealed system
only; consequently they are not intended for use on power vented
systems.
This manual is an integral part of the appliance. It is therefore
necessary to ensure that the manual is handed to the person
responsible for the property in which the appliance is located/
installed. Additional copy can be obtained from your local distributor.
IMPORTANT
It is required that all gas appliances are installed by a competent
person.
It is in your own interest and that of safety to ensure that the law is
complied with.
− The installation must conform to the requirements of the authority
having jurisdiction or, in the absence of such requirements, to
the National Fuel Gas Code, ANSI Z223.1/NFPA 54. Where
required by the authority having jurisdiction, the installation
must conform to the Standard for Controls and Safety Devices
for Automatically Fired Boilers, ANSI/ASME CSD-1.
− The installation should conform with CAN/CSA B149.1
INSTALLATION CODE and/or local installation Code, plumbing
or waste water codes and other codes as applicable.
−Clearances from combustible material must be strictly adhered to.
− Manufacturers instructions must NOT be interpreted in anyway
as overriding local regulations.
Massachusetts:
Boiler installatio n must conform to Commonwealth of
Massachusetts code 248 CMR which includes but is not limited to:
• Installation by licensed plumber or gas tter.
In the state of Massachusetts:
− This product must be installed by a licensed plumber or gas
tter.
− When exible connectors are used, the maximum length shall
not exceed 36 in. (914 mm).
− When lever type gas shutoffs are used they shall be T−handle
type.
− The use of copper tubing for gas piping is not approved by the
state of Massachusetts.
Gas furnaces manufactured on or after May 1, 2017 are not
permitted to be used in Canada for heating of buildings or
structures under construction.

6
5.1 Structure
BWCAAG000120 - BWCAAG000150
Front view 1 Filling tap
2 Condensate Trap
3 Backow preventer valve
4 Drain valve
5 Low Water Cutoff
6 Gas valve
7 Injector
8 DHW sensor
9 Water Temperature High Limit
10 Supply sensor
11 Return sensor
12 Exchanger thermostat
13 Primary Heat exchanger
14 Flame sensor
15 Manual air vent hose
16 Manual upper air vent valve
17 Flue temperature sensor
18 Positive air pressure tube
19 Flue outlet
20 Air intake
21 Negative air pressure tube
22 Air pressure switch
23 Thermal fuse
24 Ignition transformer
25 Expansion tank
26 Burner
27 Ignition electrode
28 Water discharge hose
29 Clapet
30 Fan
31 Mixer
32 Lower air vent valve
33 Pump
34 Flow sensor
35 Three way valve
36 DHW heat exchanger
Side views
1
2
3
4
5
6
7
8
9
10
11
13
14
15
16
17
18
19
12
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
8
10
9
11
17
13
12

7
BWHAAG000120 - BWHAAG000150
Front view
2 Condensate Trap
4 Drain valve
5 Low Water Cutoff
6 Gas valve
7 Injector
9 Water Temperature High Limit
10 Supply sensor
11 Return sensor
12 Exchanger thermostat
13 Primary Heat exchanger
14 Flame sensor
15 Manual air vent hose
16 Manual upper air vent valve
17 Flue temperature sensor
18 Positive air pressure tube
19 Flue outlet
20 Air intake
21 Negative air pressure tube
22 Air pressure switch
23 Thermal fuse
24 Ignition transformer
25 Expansion tank
26 Burner
27 Ignition electrode
28 Water discharge hose
29 Clapet
30 Fan
31 Mixer
32 Lower air vent valve
33 Pump
35 Three way valve
Side views
11
17
10
9
13
12

8
5.2 Boiler front control
This icon indicates that boiler is in the OFF mode (anti-freeze system active).
If the icon is not present the boiler is in the ON mode.
This icon indicates the status of the boiler.
If ON, boiler is in heating mode, if blinking there is a heating request.
This icon indicates the status of the boiler.
If ON, boiler is in the DHW mode, if blinking there is a domestic hot water request.
DHW pre-heating (only for combi models): indicates that a pre-heating cycle has been activated.
Error: indicates any operating irregularities, together with an error code message.
This icon indicates the servicing operation.
If ON, there is a system servicing operation in progress.
This icon indicates that the system is detecting the presence of a ame.
This icon indicates that the system is detecting the absence of a ame.
Water pressure low: these icons are present when the water pressure is low and needs to be re-
pressureized.
External sensor connected
Icons
SOME OF THE ICONS SHOWN ON THE
CONTROL DEVICE SCREEN AT THE START-
UP PHASE MIGHT NOT BE AVAILABLE
DURING FUNCTIONNING.
THIS DEPENDS ON YOUR BOILER
CONFIGURATIONS
LED
Light signal indicating the operating status of the boiler. Can be as follows
STATUS RED LED GREEN LED RED AND GREEN
Denitive alarm see “11.16 Lights and faults/Reset procedure”
Transitional alarm see “11.16 Lights and faults/Reset procedure”
Initial automatic air purge cycle ashing 0.5 sec on/1.0 sec off
Stand-by ashing 0.5 sec on/3.5 sec off
Flame presence ON
Call for Service – Service expire ashing 0.1 sec on/0.1 sec off
Reset ue hour counter ashing 0.5 sec on/1.0 sec off
Combustion analysis with ame ON
DHW
adjustment
left knob
The left knob allows for the domestic hot water setpoint adjustment.
It also allows you to switch from one step to another and change the value of the selected parameter
within the PROGRAMMING menu.
CH
adjustment
right knob
The right knob allows for the central heating setpoint adjustment. The CH setpoint is displayed while
turning the CH knob.
It also allows you to switch from one step to another and change the value of the selected parameter
within the PROGRAMMING menu.
MODE/OK
left button
MODE/OK (left) button allows you to change the BOILER STATUS. You can also:
- navigate through the INFO menu
- select parameters inside the PROGRAMMING menu and conrm the setting of the corresponding
parameter value
MENU/
RESET
right button
MENU/RESET (right) button allows you to reset the boiler and enter in the INFO and PROGRAMMING
menu. You can also:
- exit from the INFO and PROGRAMMING menu
- reset some error codes
DIsplay
136°F
leD
CH
adjustment knob
DHW
adjustment knob

9
5.3 Technical data
Description
BWCAAG000120(1) BWHAAG000120(2) BWCAAG000150(1) BWHAAG000150(2)
Country destination US/CAN US/CAN US/CAN US/CAN
Input - Output
Maximum CH input rate (0 - 2,000 ft / 0 - 610 m) Btu/hr 85,000 85,000 119,000 119,000
kW 24.91 24.91 34.88 34.88
Maximum DHW input rate (0 - 2,000 ft / 0 - 610 m) Btu/hr 120,000 120,000 151,000 151,000
kW 35.17 35.17 44.25 44.25
Maximum CH input rate (2,001 - 5,000 ft / 610 - 1,524 m) Btu/hr 85,000 85,000 119,000 119,000
kW 24.91 24.91 34.88 34.88
Maximum DHW input rate (2,001 - 5,000 ft / 610 - 1,524m) Btu/hr 102,000 102,000 125,000 125,000
kW 29.89 29.89 36.63 36.63
Maximum CH input rate (5,001 - 7,500 ft / 1,524- 2,286 m) Btu/hr 85,000 85,000 114,000 114,000
kW 24.91 24.91 33.41 33.41
Maximum DHW input rate (5,001 - 7,500 ft / 1,524- 2,286 m)
Btu/hr 91,000 91,000 114,000 114,000
kW 26.67 26.67 33.41 33.41
Maximum CH input rate (7,501 - 10,000 ft / 2,286 - 3,048 m)
Btu/hr 83,000 83,000 105,000 105,000
kW 24.32 24.32 30.77 30.77
Maximum DHW input rate (7,501 - 10,000 ft / 2,286 - 3,048 m)
Btu/hr 83,000 83,000 105,000 105,000
kW 24.32 24.32 30.77 30.77
Minimum input rate (0 - 2,000 ft / 0 - 610 m) Btu/hr 17,000 17,000 20,400 20,400
kW 4.98 4.98 5.98 5.98
Minimum input rate (2,001 - 5,000 ft / 610 - 1,524m) Btu/hr 17,500 17,500 19,600 19,600
kW 5.13 5.13 5.74 5.74
Minimum input rate (5,001 - 7,500 ft / 1,524- 2,286 m) Btu/hr 15,500 15,500 17,500 17,500
kW 4.54 4.54 5.13 5.13
Minimum input rate (7,501 - 10,000 ft / 2,286 - 3,048 m) Btu/hr 14,000 14,000 15,500 15,500
kW 4.10 4.10 4.54 4.54
CH output rating (0 - 2,000 ft / 0 - 610 m) Btu/hr 80,000 80,000 111,000 111,000
kW 23.45 23.45 32.53 32.53
CH output rating (2.001 - 5,000 ft / 610 - 1,524 m) Btu/hr 80,000 80,000 111,000 111,000
kW 23.45 23.45 32.53 32.53
CH output rating (5,001 - 7,500 ft / 1,524 - 2,286 m) Btu/hr 80,000 80,000 106,487 106,487
kW 23.45 23.45 32.21 32.21
CH output rating (7,501 - 10,000 ft / 2,286 - 3,048 m) Btu/hr 77,911 77,911 98,081 98,081
kW 22.83 22.83 28.74 28.74
Energy guide
AFUE % 95.0 95.0 95.0 95.0
Gas
Gas supply pressure Natural Gas (A) in. W. C. 7.0 7.0 7.0 7.0
KPa 1.7 1.7 1.7 1.7
Min. gas supply pressure Natural Gas (A) in. W. C. 3.5 3.5 3.5 3.5
KPa 0.9 0.9 0.9 0.9
Max. gas supply pressure Natural Gas (A)** in. W. C. 10.5 10.5 10.5 10.5
KPa 2.6 2.6 2.6 2.6
Gas supply pressure LPG (E) in. W. C. 11.0 11.0 11.0 11.0
KPa 2.7 2.7 2.7 2.7
Min. gas supply pressure LPG (E) in. W. C. 8.0 8.0 8.0 8.0
KPa 2.0 2.0 2.0 2.0
Max. gas supply pressure LPG (E)** in. W. C. 13.0 13.0 13.0 13.0
KPa 3.23 3.23 3.23 3.23
CH max gas rate
natural gas (A)
(0 - 2,000 ft / 0 - 610 m) ft3/hr 79.07 79.07 110.70 110.70
m3/hr 2.24 2.24 3.13 3.13
(2,001 - 5,000 ft / 610 - 1,524m) ft3/hr 79.07 79.07 110.70 110.70
m3/hr 2.24 2.24 3.13 3.13
(5,001 - 7,500 ft / 1,524- 2,286 m)
ft3/hr 79.07 79.07 106.05 106.05
m3/hr 2.24 2.24 3.00 3.00
(7,501 - 10,000 ft / 2,286 - 3,048 m)
ft3/hr 77.21 77.21 97.67 97.67
m3/hr 2.18 2.18 2.76 2.76

10
Description
BWCAAG000120(1) BWHAAG000120(2) BWCAAG000150(1) BWHAAG000150(2)
DHW max Gas Rate
natural gas (A)
(0 - 2,000 ft / 0 - 610 m) ft3/hr 111.63 111.63 140.47 140.47
m3/hr 3.16 3.16 3.97 3.97
(2,001 - 5,000 ft / 610 - 1,524m) ft3/hr 94.88 94.88 116.28 116.28
m3/hr 2.68 2.68 3.29 3.29
(5,001 - 7,500 ft / 1,524- 2,286 m)
ft3/hr 84.65 84.65 106.05 106.05
m3/hr 2.39 2.39 3.00 3.00
(7,501 - 10,000 ft / 2,286 - 3,048 m)
ft3/hr 77.21 77.21 97.67 97.67
m3/hr 2.18 2.18 2.76 2.76
Min gas rate natural
gas (A)
(0 - 2,000 ft / 0 - 610 m) ft3/hr 15.81 15.81 18.98 18.98
m3/hr 0.45 0.45 0.54 0.54
(2,001 - 5,000 ft / 610 - 1,524m) ft3/hr 16.28 16.28 18.23 18.23
m3/hr 0.46 0.46 0.52 0.52
(5,001 - 7,500 ft / 1,524- 2,286 m) ft3/hr 14.42 14.42 16.28 16.28
m3/hr 0.41 0.41 0.46 0.46
(7,501 - 10,000 ft / 2,286 - 3,048 m)
ft3/hr 13.02 13.02 14.42 14.42
m3/hr 0.37 0.37 0.41 0.41
CH max gas rate LPG
(E)
(0 - 2,000 ft / 0 - 610 m) ft3/hr 34.00 34.00 47.60 47.60
m3/hr 0.96 0.96 1.35 1.35
(2,001 - 5,000 ft / 610 - 1,524m) ft3/hr 34.00 34.00 47.60 47.60
m3/hr 0.96 0.96 1.35 1.35
(5,001 - 7,500 ft / 1,524- 2,286 m) ft3/hr 34.00 34.00 45.20 45.20
m3/hr 0.96 0.96 1.28 1.28
(7,501 - 10,000 ft / 2,286 - 3,048 m)
ft3/hr 30.40 30.40 39.20 39.20
m3/hr 0.86 0.86 1.11 1.11
DHW max gas rate
LPG (E)
(0 - 2,000 ft / 0 - 610 m) ft3/hr 48.00 48.00 60.40 60.40
m3/hr 1.36 1.36 1.71 1.71
(2,001 - 5,000 ft / 610 - 1,524m) ft3/hr 38.40 38.40 48.40 48.40
m3/hr 1.09 1.09 1.37 1.37
(5,001 - 7,500 ft / 1,524- 2,286 m) ft3/hr 35.00 35.00 45.20 45.20
m3/hr 0.99 0.99 1.28 1.28
(7,501 - 10,000 ft / 2,286 - 3,048 m)
ft3/hr 30.40 30.40 39.20 39.20
m3/hr 0.86 0.86 1.11 1.11
Min gas rate LPG (E)
(0 - 2,000 ft / 0 - 610 m) ft3/hr 6.80 6.80 8.16 8.16
m3/hr 0.19 0.19 0.23 0.23
(2,001 - 5,000 ft / 610 - 1,524m) ft3/hr 6.60 6.60 7.60 7.60
m3/hr 0.19 0.19 0.22 0.22
(5,001 - 7,500 ft / 1,524- 2,286 m) ft3/hr 7.04 7.04 7.20 7.20
m3/hr 0.20 0.20 0.20 0.20
(7,501 - 10,000 ft / 2,286 - 3,048 m)
ft3/hr 6.00 6.00 6.60 6.60
m3/hr 0.17 0.17 0.19 0.19
Number of fan rotations
with Start up/Ignition
RPM (A)
(0 - 2,000 ft / 0 - 610 m) rpm 5,000 5,000 4,000 4,000
(2,001 - 5,000 ft / 610 - 1,524m) rpm 5,000 5,000 4,000 4,000
(5,001 - 7,500 ft / 1,524- 2,286 m) rpm 5,000 5,000 4,000 4,000
(7,501 - 10,000 ft / 2,286 - 3,048 m) rpm 5,000 5,000 4,000 4,000
Number of fan rotations
max CH (A)
(0 - 2,000 ft / 0 - 610 m) rpm 7,100 7,100 7,700 7,700
(2,001 - 5,000 ft / 610 - 1,524m) rpm 8,300 8,300 9,000 9,000
(5,001 - 7,500 ft / 1,524- 2,286 m) rpm 9,200 9,200 9,400 9,400
(7,501 - 10,000 ft / 2,286 - 3,048 m) rpm 9,800 9,800 9,400 9,400
Number of fan rotations
max DHW (A)
(0 - 2,000 ft / 0 - 610 m) rpm 9,800 9,800 9,800 9,800
(2,001 - 5,000 ft / 610 - 1,524m) rpm 9,800 9,800 9,400 9,400
(5,001 - 7,500 ft / 1,524- 2,286 m) rpm 9,800 9,800 9,400 9,400
(7,501 - 10,000 ft / 2,286 - 3,048 m) rpm 9,800 9,800 9,400 9,400
Number of fan rotations
min CH-DHW (A)
(0 - 2,000 ft / 0 - 610 m) rpm 2,000 2,000 1,800 1,800
(2,001 - 5,000 ft / 610 - 1,524m) rpm 2,400 2,400 2,200 2,200
(5,001 - 7,500 ft / 1,524- 2,286 m) rpm 2,400 2,400 2,200 2,200
(7,501 - 10,000 ft / 2,286 - 3,048 m) rpm 2,400 2,400 2,200 2,200
Number of fan rotations
with Start up/Ignition
(E)
(0 - 2,000 ft / 0 - 610 m) rpm 5,000 5,000 4,000 4,000
(2,001 - 5,000 ft / 610 - 1,524m) rpm 5,000 5,000 4,000 4,000
(5,001 - 7,500 ft / 1,524- 2,286 m) rpm 5,000 5,000 4,000 4,000
(7,501 - 10,000 ft / 2,286 - 3,048 m) rpm 5,000 5,000 4,000 4,000
Number of fan rotations
max CH (E)
(0 - 2,000 ft / 0 - 610 m) rpm 6,750 6,750 7,500 7,500
(2,001 - 5,000 ft / 610 - 1,524m) rpm 8,750 8,750 9,250 9,250
(5,001 - 7,500 ft / 1,524- 2,286 m) rpm 9,550 9,550 9,400 9,400
(7,501 - 10,000 ft / 2,286 - 3,048 m) rpm 9,400 9,400 9,400 9,400

11
Description
BWCAAG000120(1) BWHAAG000120(2) BWCAAG000150(1) BWHAAG000150(2)
Number of fan rotations
max DHW (E)
(0 - 2,000 ft / 0 - 610 m) rpm 9,150 9,150 9,350 9,350
(2,001 - 5,000 ft / 610 - 1,524m) rpm 9,800 9,800 9,400 9,400
(5,001 - 7,500 ft / 1,524- 2,286 m) rpm 9,800 9,800 9,400 9,400
(7,501 - 10,000 ft / 2,286 - 3,048 m) rpm 9,400 9,400 9,000 9,000
Number of fan rotations
min CH-DHW (E)
(0 - 2,000 ft / 0 - 610 m) rpm 1,850 1,850 1,800 1,800
(2,001 - 5,000 ft / 610 - 1,524m) rpm 2,350 2,350 2,200 2,200
(5,001 - 7,500 ft / 1,524- 2,286 m) rpm 2,500 2,500 2,200 2,200
(7,501 - 10,000 ft / 2,286 - 3,048 m) rpm 2,500 2,500 2,200 2,200
CH system data
Minimum relief valve capacity lbs/hr 510 510 510 510
g/s 64 64 64 64
Maximum operating pressure p.s.i. 30 30 30 30
bar 2.07 2.07 2.07 2.07
Minimum operating pressure p.s.i. 4.5 4.5 4.5 4.5
bar 0.3 0.3 0.3 0.3
Pump residual head at max ow rate ft. hd 4.38 4.38 5 5
mbar 130 130 150 150
At system capacity gpm 4.4 4.4 4.4 4.4
l/h 1,000 1,000 1,000 1,000
Maximum temperature °F 194 194 194 194
°C 90 90 90 90
Selectable range of heating water temperature (high
temperature)
°F 68-180 68-180 68-180 68-180
°C 20-82 20-82 20-82 20-82
Selectable range of heating water temperature (low
temperature)
°F 68-113 68-113 68-113 68-113
°C 20-45 20-45 20-45 20-45
Expansion tank charge and initial system pressure psi 14.5 14.5 14.5 14.5
bar 1 1 1 1
Total water content of system using 2.3 gal/9.0 l capacity
expansion tank supplied with appliance
gal 29.1 29.1 31.7 31.7
l110 110 120 120
DHW system data
Maximum operating pressure p.s.i. 116 -116 -
bar 8 - 8 -
Minimum operating pressure p.s.i. 2.9 - 2.9 -
bar 0.2 - 0.2 -
Selection eld of domestic hot water temperature
°F 100-140 (120
max default) -100-140 (120 max default) -
°C 37-60 (49
max default) -37-60 (49 max default) -
Minimum DHW ow rate gal/min 0.52 - 0.52 -
l/min 2.0 - 2.0 -
Flow regulator (factory tted) gal/min 3.2 - 4.0 -
l/min 12 - 15 -
Red Lemon green
DHW ow rate at 70 °F (39°C) temperature rise (tested
according 10 CFR Appendix E to Subpart B of Part 430 with
the ow regulator factory tted)
gal/min 3.1 - 3.8 -
l/min 11.8 - 14.2 -
Electric data
Electric rate voltage VAC - Hz 120 - 60 120 - 60 120 - 60 120 - 60
Current less than A0.89 0.89 0.99 0.99
Electric consumption (pump included) W 107 107 119 119
Max Overcurrent Protection (***) A4 4 4 4
Min Wire Size (***) AWG 18 18 18 18
Min Wire Size 14 AWG
CO2 setting natural gas (A) high-re %8.8 ± 1% 8.8 ± 1% 8.8 ± 1% 8.8 ± 1%
low-re 9.4 ± 1% 9.4 ± 1% 9.4 ± 1% 9.4 ± 1%
CO2 setting LPG (E) high-re %9.8 ± 1% 9.8 ± 1% 9.8 ± 1% 9.8 ± 1%
low-re 10.4 ± 1% 10.4 ± 1% 10.4 ± 1% 10.4 ± 1%
NOx natural gas (A) max air free ppm ≤ 40 ≤ 40 ≤ 40 ≤ 40
min air free ppm ≤ 40 ≤ 40 ≤ 30 ≤ 30
NOx LPG (E) max air free ppm ≤ 60 ≤ 60 ≤ 40 ≤ 40
min air free ppm ≤ 70 ≤ 70 ≤ 40 ≤ 40

12
(1) = combi boiler
(2) = heating only
** The maximum inlet gas pressure must not exceed the value
specied by the manufacturer and the minimum value listed is
for purposes of input adjustment.
(A) Natural gas
(E) LPG
(***) Boiler is equipped with a standard NEMA 5-15 grounded plug
connection. Receptacle outlet Max Overcurrent Protection and
Min Wire Size should conform to the codes listed in Section
“7.7.1 Electrical supply” page 21 “
Description
BWCAAG000120(1) BWHAAG000120(2) BWCAAG000150(1) BWHAAG000150(2)
CO natural gas (A) max air free ppm ≤ 120 ≤ 120 ≤ 90 ≤ 90
min air free ppm ≤ 20 ≤ 20 ≤ 15 ≤ 15
CO LPG (E) max air free ppm ≤ 170 ≤ 170 ≤ 150 ≤ 150
min air free ppm ≤ 30 ≤ 30 ≤ 15 ≤ 15
Max CH rate ue temperature (A) at
boiler return temp. 140°F/60°C
°F 144 144 157 157
°C 62 62 69 69
Max CH rate ue temperature (E) at
boiler return temp. 140°F/60°C
°F 144 144 158 158
°C 62 62 70 70
Min CH rate ue temperature (A) at
boiler return temp. 140°F/60°C
°F 151 151 133 133
°C 66 66 56 56
Min CH rate ue temperature (E) at
boiler return temp. 140°F/60°C
°F 141 141 140 140
°C 61 61 60 60
Boiler dimensions and weight
Boiler dimensions (heigh - width- depht)
in.
29.13 x 13.7
x
16.5
29.13 x 13.7
x
16.5
29.13 x 13.7
x
16.5
29.13 x 13.7
x
16.5
mm 740x348x
420
740x348x
420
740x348x
420
740x348x
420
Weight net lb 89 87 97 94
kg 40.5 39.5 44 43
Components
Burner Sermeta 54485 Sermeta 54486
Main heat exchanger Sermeta 3+1+1 Afue 95 Sermeta 4+1+1 Afue 95
Gas valve Sit 849
Pump Grundfos UPS 15-58
Pressure relief valve Watts
3-Way valve for DHW Eltek
BWHAAG000120 - BWHAAG000150: DHW data must be
considered only if an indirect tank is connected to the boiler.

13
5.4 Hydraulic circuit
manual
air vent main heat
exchanger
return
temperature
sensor
supply temperature
sensor
water temperature
high limit
expansion
tank
automatic
air vent
pump
three-way
valve
pressure
relief
valve
drain
valve
automatic
bypass
check
valve
Low water
Cutoff
SUPPLY RETURN
lling
tap
domestic hot water
temperature sensor
DHW
heat
exchanger
ow
restrictor
owmeter
HOT
WATER
OUTLET
COLD
WATER
INLET
BWCAAG000120 - BWCAAG000150
BWHAAG000120 - BWHAAG000150
pressure
relief valve
drain
valve
SUPPLY
automatic
bypass
check
valve
low water
cutoff
water
temperature
high limit
supply temperature
sensor
pump
three-way
valve
automatic
air vent
RETURN
HOT
WATER
OUTLET
COLD
WATER
INLET
main heat
exchanger
return
temperature
sensor
expansion
tank
INDIRECT
TANK
DELIVERY
INDIRECT
TANK
RETURN
indirect tank
(OPTIONAL)
manual
air vent

14
E D C B A
Legend
A Heating return 3/4” NPT
B Cold water inlet 1/2” NPT
C Gas 3/4” NPT
DHot water outlet 1/2” NPT
E Heating supply 3/4” NPT
Pressure relief valve 3/4” NPT
Drain condensate outlet Ø (rubber exible) 7/8” (21 mm)
3/4" NPT
1/2" NPT
3/4" NPT
1/2" NPT
3/4" NPT
Heating supply-Pressure relief valve
3/4" NPT 3/4" NPT
Hot water
outlet
1/2" NPT
Gas
3/4" NPT
Cold water
inlet
1/2" NPT
Heating return
3/4" NPT
3/4" NPT
FEMALE
condensate
check valve
3/4" NPT
3/4" NPT
3/4" NPT
3/4" NPT 3/4" NPT
Gas
3/4" NPT
Heating return
3/4" NPT
3/4" NPT
FEMALE
3/4" NPT 3/4" NPT
Indirect water tank
supply
3/4" NPT
Water tank
return
3/4" NPT
condensate
check valve
Heating supply-Pressure relief valve
E D C B A
Legend
A Heating return 3/4” NPT
B Water tank return 3/4” NPT
C Gas 3/4” NPT
DIndirect tank supply 3/4” NPT
E Heating supply 3/4” NPT
Pressure relief valve 3/4” NPT
Drain condensate outlet Ø (rubber exible) 7/8” (21 mm)
29/16” 29/16”43/4”
BWCAAG000120 - BWCAAG000150 BWHAAG000120 - BWHAAG000150
29/16” 29/16”43/4”
6
15/16”
25/16”
41/16”
29/16”17/8”27/8”29/16”213/16” 313/16”
Lower view

15
5.5 Dimensions and connections
16 1/2”
71/16” 71/16”
29 1/8”
3
1/4”
13 3/4”
57/8”
615/16”
215/16”
61/2” 43/4” 51/4”
5
7/8”
7 7/8 “ 200 mm
1”
25 mm
6” *
150 mm
18 in.
Recommended Minimum service clearances
13 3/4"
5 7/8"
29 1/8"
2 5/16"
6 15/16"
Top view
Front and side view
* Service clearances on the right side of the boiler can be decreased up to 1” (25 mm) if the provided Warning Label and
Lighting Instructions are applied to the front of the boiler casing

16
6 BEFORE INSTALLATION
The manufacturer strongly recommends that this manual be
reviewed thoroughly before installing your boiler.
Please review “3 Safety” page 4 before installing the boiler.
Factory warranty does not apply to boilers that have been
improperly installed or operated.
Installation and service must be performed by a qualied installer,
service agency or gas supplier. If, after reviewing this manual, you
still have questions which this manual does not answer, please
contact your l ocal distributor . Thank you for purchasing this product.
We hope you will be satised with the high quality and durability of
our equipment.
9 WARNING: Remove the two caps in the vet adaptors before
installing the vent terminations
6.1 Installations must comply with:
− Local, state, provincial, and national codes, laws, regulations
and ordinances.
− National Fuel Gas Code, ANSI Z223.1/NFPA 54 – latest edition.
− National Electrical Code.
− For Canada only: CAN/CSA B149.1 Installation Code, CSA
C22.1 Canadian Electrical Code Part 1 and any local codes.
The boiler must be installed indoors in a dry location where the
ambient temperature must be maintained above freezing and
below 100°F [38°C]. All boiler components must be protected from
dripping, spraying water, or rain during operation and servicing.
Consider the proximity of system piping, gas and electrical supply,
condensate disposal drain, and proximity to vent termination when
determining the best boiler location.
The boiler is both for closet and alcove installation.
Closet Installations
CLOSET INSTALLATION
0 in./0 mm between the back of the unit and the wall.
Alcove Installations
Alcove installations have the same minimum clearances as closet
installations, except the front must be completely open to the room
at a distance no greater than 18 in. [457 mm] from the front of
the boiler and the room is at least three (3) times the size of the
alcove. Provided these conditions are met, the boiler requires no
extra ventilation air openings to the space.
9 CAUTION Apply the provided Warning Label and Lighting
Instructions to the front of the boiler casing if the closet or
alcove sides are less than 6” (150 mm) from the boiler right
side. Doing so will make the Lighting Instruction and Warning
Label visible for the appliance in an Alcove or Closet
Residential Garage Installation
When installed in a residential garage, mount the boiler a minimum
of 18 in. [457 mm] above the oor. Locate or protect the boiler
so it cannot be damaged by a moving vehicle. Check with your
local authorities for other possible regulations pertaining to the
installation of a boiler in a garage.
6.2 Before locating the boiler
Check for nearby connections to:
− System water piping
− Venting connections
− Gas supply piping
− Electrical power.
Check area around boiler. Remove any combustible materials,
gasoline and other ammable liquids.
Check water quality.
9 WARNING: Failure to keep boiler area clear and free of
combustible materials, gasoline and other ammable liquids
and vapors can result in severe personal injury, death or
substantial property damage.
The boiler must be installed so that gas control system components
are protected from dripping or spraying water or rain during
operation or service.
If the new boiler is to replace an existing boiler, check for and
correct any existing system problems such as:
− System leaks
− Incorrectly-sized expansion tank
− Lack of freeze protection in the heating system causing the
system and boiler to freeze and leak
− Excessive glycol which will affect the boiler system operation.
6.3 Clearances for service access
See “5.5 Dimensions and connections” page 15 for recommended
service clearances. If you do not provide the minimum clearances
shown, it might not be possible to service the boiler without
removing it from the space.
9 WARNING: The space must be provided with combustion/
ventilation air openings correctly sized for all other appliances
located in the same space as the boiler. The boiler front
cover must be securely fastened to the boiler to prevent the
boiler from drawing air from inside the boiler room in a sealed
combustion application. This is particularly important if the
boiler is located in the same room as other appliances. Failure
to comply with the above warnings could result in severe
personal injury, death or substantial property damage.
6.3.1 Exhaust vent and intake air vent
The boiler are certied to the ANSI Z21.13-2017 ● CSA 4.9-2017
– Gas-Fired low pressure steam and hot water boilers. Direct vent,
Category IV (pressurized vent, likely to condense in the vent)
appliances.
NOTICE: To prevent combustion air contamination when
considering the exhaust vent and intake air vent termination, intake

17
and exhaust may be vented vertically through the roof or out a side
wall.
The intake and exhaust venting methods are detailed in the
General venting Section. Do not attempt to install the boiler using
any other means. Be sure to locate the boiler such that the air
intake and exhaust vent piping can be routed through the building
and properly terminated. The air intake and exhaust vent piping
lengths, routing and termination method must all comply with the
methods and limits given within the Venting section.
6.4 Prevent combustion air contamination
Install intake air piping for this boiler as described in the Venting
section. Do not terminate exhaust in locations that can allow for
contamination of the intake air.
9 WARNING: You must pipe outside air to the boiler air intake
for sealed combustion operation. Ensure that the intake air will
not contain any of the contaminants below. Contaminated air
will damage the boiler, resulting in possible severe personal
injury, death or substantial property damage. For example, do
not pipe the intake air vent near a swimming pool. Also avoid
areas subject to exhaust fumes from laundry facilities. These
areas may contain contaminants.
6.5 When removing an existing boiler from an
existing common vent system
Do not install the boiler into a common vent with any other appliance.
This will cause ue gas spillage or appliance malfunction, resulting
in possible severe personal injury, death or substantial property
damage.
9 WARNING: Failure to follow all instructions can result in ue
gas spillage and carbon monoxide emissions, causing severe
personal injury or death.
When an existing boiler is removed from a common venting
system, the common venting system is likely to be too large for
proper venting of the appliances remaining connected to it.
At the time of removal of an existing boiler, the following steps
shall be followed with each appliance remaining connected to
the common venting system placed in operation, while the other
appliances remaining connected to the common venting system
are not in operation.
A Seal any unused openings in the common venting system.
B Visually inspect the venting system for proper size and
horizontal pitch and to determine there is no blockage or
restriction, leakage, corrosion and other deciencies which
could cause an unsafe condition.
C Insofar as is practical, close all building doors and windows and
all doors between the space in which the appliances remaining
connected to the common venting system are located and
other spaces of the building, so long as it is practical to do so.
Turn on clothes dryers and any appliance not connected to the
common venting system. Turn on any exhaust fans, such as
range hoods and bathroom exhausts, so they will operate at
maximum speed. Do not operate a summer exhaust fan. Close
replace dampers.
D Place in operation the appliance being inspected. Follow the
lighting instructions. Adjust thermostat so the appliance will
operate continuously.
E Test for spillage at the draft hood relief opening after 5 minutes
of main burner operation. Use the ame of a match or candle,
or smoke from a cigarette, cigar or pipe.
F After it has been determined that each boiler remaining
connected to the common venting system properly vents when
tested as outlined above, return doors, windows, exhaust fans,
replace dampers and any other gas burning boiler to their
previous condition of use.
G Any improper operation of the common venting system should
be corrected so the installation conforms with the National Fuel
Gas Code, ANSI Z223.1/NFPA 54 — latest edition. Correct by
resizing to approach the minimum size as determined using
the appropriate tables in ANSI Z223.1/NFPA 54 of that code.
Canadian installations must comply with CAN/CSA B149.1
Installation Code.
9 WARNING: Verify proper operation after servicing.
6.6 Prepare the boiler
9 CAUTION: Cold weather handling — If boiler has been stored
in a very cold location (below 0°F (-18°C)) before installation,
handle with care until the plastic components come to room
temperature.
7 INSTALLATION
7.1 Wall mounting information
The boiler comes with a template, which allows you to easily mark
the location of the screws for the mounting bracket and the location
of the ue gas pipe on the wall.
The gas connection must be made on site, a 3/4” gas cock is
supplied with the boiler.
9 WARNING: This boiler is heavy and awkward to lift. It is
recommended and safer to install the boiler with two people.
Use caution as to not drop the boiler which could cause
personal injury. Verify that the boiler is securely mounted
before leaving the boiler unsupervised.
The wall must be vertically plumb and capable of carrying the
weight of the boiler and its related components.
9 CAUTION: If the boiler is not vertically plumb, improper and
unsatisfactory operation may occur. This will cause excessive
condensation build-up resulting in unnecessary maintenance
and nuisance fault codes.
NOTICE: The mounting bracket is shown for installation of the
combi and heating only boiler.
7.1.1 Placing the wall-mounted boiler
The boilers are wall mounted. Use only the combi and heating only
boiler wall mounting instructions included in the box.
9 WARNING: The wall must be capable of carrying
the weight of the boiler and its related components.
The shipping weights of the boiler are approximately:
BWCAAG000120 - combi = 89 lb (40.5 kg)
BWHAAG000120 - only heating = 87 lb (39.5 kg)
BWCAAG000150 - combi = 97 lb (44 kg)
BWHAAG000150 - only heating = 94 lb (43 kg)
Failure to comply with above could result in severe personal injury,
death or substantial property damage.

18
7. 2 Boiler template
BWCAAG000120 - BWCAAG000150 (combi)
( (7 1( (((
((
BWHAAG000120 - BWHAAG000150 (heating only)
8 03 1/8" - (mm)
4 31 11/16" - (mm)
6 5( mm)
2 9/16"
6 5( mm)
2 9/16"
7 1( mm)
2 13/16"
9 7( mm)
3 13/16"
42016 1/2" - (mm)
dimension boiler
38715 1/4" - (mm)
2 03/4" - (mm)
67826 11/16" - (mm)
74029 1/8" - (mm)
47.75( mm)
1 7/8"
73.75( mm)
2 7/8"
2 9( mm)
1 1/8"
3 6( mm)
1 7/16"
3308 1/4" - (mm)
Minimum top clearance
406.516" - (mm)
3 81 1/2" (x2) - (mm)
3.41/8" - (mm)
16.65/8" - (mm)16.65/8" - (mm)
8 03 1/8" - (mm)
1204 3/4" - (mm)
3.41/8" - (mm)
8 0
3 3 / 1 6 " - ( mm)
2519 7/8" - (mm)
8 0
3 3 / 1 6 " - ( mm)
100
4 " - ( mm)
2188 9/16" - (mm)
1505 7/8" - (mm)
Minimum bottom clearance
3/4" NPT
3/4" NPT
3/4" NPT
3/4" NPT
Bottom of Casing
Heating supply-Pressure relief valve
3/4" NPT 3/4" NPT
Gas
3/4" NPT
Indirect water tank
return
3/4" NPT
Minimun side clearance
0.984 inch / 1"
Minimun side clearance
0.984 inch / 1"
Top of Casing
CENTER LINE
OF BOILER
L
C
Ensure there is adequate clearances for mounting the boiler
(details given in installation instructions).
The wall mount bracket is designed for a stud spacing of 16 inches from center.
For other stud spacing a solid mounting surface must be provided by the installer.
Do not mount the boiler to a hollow wall.
Be sure to mount the boiler to the studs only.
Mount the wall bracket using 4 5/16" lag screws.
Ensure the bracket is level when mounted.
Extreme care is needed to ensure the bolts are secured in the studs.
This boiler is heavy and awkward to lift. It is
recommended and safer to install the boiler with two
people. Use caution as to not drop this boiler which
could cause personal injury. Verify that the boiler is
securely mounted before leaving the boiler unsupervised.
WARNING
Boiler bracket (supplied)
Ø1/4" holes for 5/16"
lag screws (4 places)
Air inlet
Exhaust flue outlet
Wall stud
3/4" NPT
FEMALE
condensate
check valve
3/4" NPT
Heating return
3/4" NPT
Indirect water tank
supply
3/4" NPT
7.2.1 Installation steps
Prior to lifting the boiler onto the wall, use the enclosed template to
level and locate the wall bracket.
- Fasten the boiler sup port plate to the wall and use a spirit level to
make sure it is perfectly horizontal.
- Mark the placement of the 2 holes for securing the boiler support
plate make sure that all measurements are exact, then drill the wall
using drill tips with the diameters indicated on the wall template.
- Fix the plate, using the wall template, to the wall.
- Hang the boiler.
- Fix the pressure relief valve (PRV) ad described on the wall
template.
- Install the condensate check valve dispositive.
-Install the hydraulic connections.

19
- Install the gas valve main supply.
- Install the exhaust ue and intake air piping.
- Carry out the electrical connection according to local code rules.
7.3 ASME pressure relief valve
The boiler has a pressure relief valve supplied with the boiler.
Connect the valve hydraulically on the heating supply connection
and in vertical position ( see reference picture).
This device is designed for emergency safety relief and shall not be
used as an operating control.
9 WARNING: To avoid water damage or scalding due to relief
valve operation:
− The discharge line must be connected to relief valve outlet and
run to a safe place of disposal. Terminate the discharge line in a
manner that will prevent possibility of severe burns or property
damage.
− The discharge line must be as short as possible and be the
same size as the valve discharge connection throughout its
entire length.
− The discharge line must pitch downward from the valve and
terminate at least 6’’ (152 mm) above the oor drain where any
discharge will be clearly visible.
− The discharge line shall terminate through plain (unthreaded)
pipe. The discharge line material must conform to local plumbing
code or A.S.M.E. requirements.
− No shutoff valve shall be installed between the relief valve and
the boiler, or in the discharge line.
− Do not pipe the discharge to any place where freezing could
occur.
− Do not plug or place any obstruction in the discharge line.
− Test the operation of the valve after lling and pressurizing
system by lifting the lever. Make sure the valve discharges
freely. If the valve fails to operate correctly, replace it with a new
relief valve.
− For boilers installed with only a pressure relief valve, the indirect
storage tank (if used) must have a temperature and pressure
relief valve installed. This relief valve shall comply with the
standard for Relief Valves for Hot Water Supply Systems, ANSI
Z21.22/CSA4.4.
− Failure to comply with the above guidelines could result in the
failure of the relief valve to operate, resulting in the possibility of
severe personal injury, death or substantial property damage.
− For safe operation of the appliance, the relief valve must not be
removed or plugged.
Maintenance of the relief valve
9 CAUTION: The valve lever must be operated at least once
a year by qualied personnel during annual maintenance to
insure that water-ways are clear.
Certain natural occurring mineral deposits may adhere to the valve,
rendering it inoperative. When manually operating the lever, water
will discharge and precautions must be taken to avoid contact
with hot water and to avoid water damage. Before operating the
lever, check to see that a discharge line is connected to this valve
directing the ow of hot water from the valve to a proper place of
disposal, otherwise personal injury may result. If no water ows,
the valve is inoperative.
Call a qualied plumber immediately.
Pressure relief valve should be inspected at least once every three
years by a licensed plumbing contractor or authorized inspection
agency, to insure that the product has not been affected by corrosive
water conditions and to insure that the valve and discharge line
have not been altered or tampered with illegally. Certain naturally
occurring conditions may corrode the valve or its components
over time, rendering the valve inoperative. Such conditions are
not detectable unless the valve and its components are physically
removed and inspected. Do not attempt to conduct this inspection
on your own. Contact your plumbing contractor for a reinspection
to assure continuing safety.
9 WARNING: Failure to reinspect this valve as directed could
result in unsafe pressure buildup which can result in serious
injury or death and/or severe property damage.
7.4 Installing the condensate check valve
It is mandatory, before star ting the boiler, even just temporarily, to
install the condensate check valve supplied as standard.
For the installation proceed as follows:
- remove the plug (T) from the condensate trap
- carefully secure the condensate check valve, screwing it on tight
and checking its seal
- connect a pipe for draining the condensate to a suitable collection
and evacuation system in the white water outlet and in compliance
with cu rrent legislation.
9
Tcondensate
check valve
condensate pipe
WARNING: The manufacturer is NOT responsible for any
damage caused by the installation of the boiler without the
condensate check valve being correctly positioned. An
improperly installed or damaged condensate check valve may
result in substantial property damage, severe personal injury
or death.
Install the exible condensate drain pipe (Ø 7/8” - 21 mm exible
rubber female connection) with a suitable gradient to avoid
condensate stagnation.
Discharge condensate from the boiler into the drainage system,
either directly or (if required) via a neutralizer kit (not supplied).
The condensate drain of the boiler is equipped with a built-in
condensate trap in order to keep ue gases from being discharged
via the condensate drain.
The condensate formed both in the condensing boiler and in the
ue gas pipe must be discharged into the public sewage system in
accordance with all applicable local regulations.
The condensate produced by a gas-red heating system has a pH
value between 3 and 4.
Some local codes may require the use of a separate neutralizer kit
to treat the condensate.
With a neutralizer kit installed, all condensate from the boiler and
the ue gas pipe enters into the neutralizer kit where it is treated
and released into the public sewage system with a safe pH value
of above 6.5.
The use of neutralization granulate (performing the neutralizing
process) is dependent on the operation of the heating system.
To determine the required rell amount, check granulate level
several times during the rst year of operation. In some cases one
granulate ll may last an entire year.
The condensate discharge outlet to the drainage system connection
must be clearly visible. It must be installed with a suitable gradient
and provided with a stench trap.
If the condensate outlet of the boiler is lower than the drain, a
condensate pump must be used.
Only corrosion-resistant materials may be used for condensate
drainage purposes. Do not use galvanized materials or materials
containing copper for piping, couplings etc.
Please note that other requirements may apply depending on local
regulations and/or project-specic details.
It is advisable to contact your local waterworks ofce (authority
responsible for waste water regulations) well before commencing
with the installation of the neutralizer kit in order to establish details
of local regulations that apply.
NOTICE: Pipe ventilation must take place between the condensate
trap and the neutralizer kit (if applicable).

20
7. 5 Loose ow regulators
The boiler includes additional ow regulators to be used depending
on the area where the product is installed.
BWC150 - tted Lemon green 15.0 l/min 4.0 ga l/m in
BWC150 - spares Olive Green 13.0 l/min 3.4 ga l/m in
Gray 18.0 l/min 4.8 ga l/m in
BWC120 - tted Red 12.0 l/min 3.2 gal/min
BWC120 - spares Blue 10.0 l/min 2.6 ga l/m in
Dark blue 16.0 l/min 4.2 ga l/m in
DHW FLOW RATE
Entering
Water
Leaving
Water
BWC150
Large Combi
BWC120
Small Combi
Notes:
°F °F GPM GPM
58 125 3.9 3.30
10 CFR Appendix E to
Subpart B of Part 430 –
tested with the factory
tted ow restrictor.
How to select the ow restrictor to be used inside the boiler.
The selection must be done according the average ground
temperature in the area of boiler installation (entering water
temperature) and the minimum required leaving temperature
(outlet temperature of domestic hot water).
Select the ow restrictor according the below formula [the rst one
with value less or equal to the calculated value]
K/(X-Y)= DHW FLOW RATE according 10 CFR Appendix E to
Subpart B of Part 430
K= 3.9x(125-58)= 261.3 for BWC150
K= 3.3x(125-58) = 221.1 for BWC120
X= Minimum leaving temperature required
Y= Entering temperature of your area (from the map below)
Example:
Entering temperature of your area (from the map below) = 42°F
Minimum leaving temperature required = 115 °F
Boiler model: BWC150
261.3/(115-42) = 3.6 GPM ➡ Select 3.4 GPM ow restrictor [the
rst one with value less or equal to the calculated value]
7. 6 General piping information
9 CAUTION: Use two wrenches when tightening water piping at
the boiler, using one wrench to prevent the boiler return line
or supply line from turning. Failure to support the boiler piping
connections to prevent them from turning could cause damage
to boiler components.
NOTICE: The boiler control module uses temperature sensors
to provide both high limit protection and modulating temperature
control. The PCB also provides low water protection using a
water pressure sensor (minimum 6.5 psi (0.45 bar)). Some codes/
jurisdictions may require additional external controls for high limit
and/or low water cutoff protection.
7.6.1 Separate low water cutoff
A low water cutoff may be required by state local code or some
insurance companies. Check code requirements before installation
of the boiler. If required:
−Use a low water cutoff designed for hydronic installations
− Follow low water cutoff manufacturer’s instructions.
A hot water boiler installed above the radiation level or as required
by the Authority having jurisdiction, must be provided with a low
water cutoff device either as part of the boiler or at the time of boiler
installation.
NOTICE: The electronic low water cutoff located internally in the
boiler is below the lowest safe permissible water level established
by the boiler manufacturer.
7.6.2 Backow preventer (heating only model)
Use a backflow preventer specifically designed for hydronic boiler
installations. This valve should be installed on the cold water fill
supply line per local codes.
7.6.3 Fitting the heating circuit supply and
return pipes
NOTICE: To protect the entire heating system the manufacturer
recommends installing a Y-Strainer in the return circuit. When
connecting the boiler to an existing heating system this device is
recommended to be installed.
− Install shut-off valves immediately before and after the Y-Strainer
to enable the Y-Strainer to be cleaned.
− Install a ll valve and drain valve in the heating system supply
pipe if required.
− Also plumb the pressure relief valve to the drain system.
NOTICE: When using oxygen-permeable pipes, e. g. for oor
heating systems, you must separate the system using heat
exchangers.
− Thoroughly ush all pipes and radiators.
− Refer to the installation wall template for the pipe connection
dimensions.
− Connect the pipes so that they are free from strain.
7.6.4 Sizing space heat system piping
Size the piping and components in the space heating system using
recognized design methods.
Verify the 2.3 gal (9l) expansion tank is large enough for the
application. Some applications, such as base-board heating, may
require an additional expansion tank.
NOTICE: The boiler, when used in connection with a refrigeration
system, must be installed so the chilled medium is piped in parallel
with the boiler and with appropriate valves to prevent the chilled
medium from entering the boiler.
NOTICE: The boiler piping system of a hot water boiler connected
to heating coils, located in air handling units, where they may
be exposed to refrigerated air circulation must be equipped with
ow control valves or other automatic means to prevent gravity
circulation of the boiler water during the cooling cycle.
7.6.5 Available Pump Head (ft. hd.)
The boiler is designed for closed loop, forced circulation hot water
heating systems only.
The boiler is equipped with an internal pump.
PUMP DUTY
Residual head of circulator
The residual head for the heating system is represented in the
graph, according to the ow rate. The piping on the heating system
must be sized taking into account the available residual head value.
Bear in mind that the boiler will operate correctly if there is sufcient
water circulation in the heat exchanger, as the boiler is equipped
with an automatic internal by-pass which is designed to ensure
water ow rate into the heat exchanger is correct under any
installation conditions.
9 CAUTION: BWHAAG000120 and BWHAAG000150 must not
be operated as a potable Hot Water Boiler. BWCAAG000120
and BWCAAG000150 must not be operated in an open
system.