Bryant BW4B User Manual

Gas and Oil-Fired Water and  
Gas Fired Steam Boilers  
BS  
BW  
MODEL BW1, BW2  
MODEL BW3  
Series B  
Series B  
MODEL BS1, BS2  
Series B  
MODEL BW9  
Series A  
MODEL BW4B, BW5B  
Series B  
Form No. PDS BS1A.75.3  
BOILER ACCESSORIES (CONT.)  
Combustible Floor Base (6 thru 7 section models)  
KBASB0401DNK  
KBANP0301DNK  
KBANP0401DNK  
KBANP0501DNK  
KBANP0601DNK  
KBANP0701DNK  
KBANP0801DNK  
KBANP0901DNK  
Gas Conversion Kit Natural to Propane (3 section, BS1/2-075)  
Gas Conversion Kit Natural to Propane (4 section, BS1/2-112)  
Gas Conversion Kit Natural to Propane (5 section, BS1/2-150)  
Gas Conversion Kit Natural to Propane (6 section, BS1/2-187)  
Gas Conversion Kit Natural to Propane (7 section, BS1/2-225)  
Gas Conversion Kit Natural to Propane (8 section, BS1/2-262)  
Gas Conversion Kit Natural to Propane (9 section, BS1/2-299)  
NOTE: There was never a Natural to Propane conversion kit for BW/BS boilers prior to 1799V.  
BW4/BW5  
DESCRIPTION  
PART NO.  
Filtrol Package (Includes Air Purge Extrol Tank and Fill Valve)  
KBAFP0201DNK  
KBAFP0301DNK  
KBAZV0101DNK  
KBAZV0201DNK  
KBAHL0101DNK  
KBATH0101IDNK  
KBASB0301DNK  
KBALF0101DNK  
KBALF0201DNK  
Zone Valve - 3/4 in.  
Zone Valve - 1 in.  
High-Limit Control - Manual Reset*  
Tankless Water Heater Kit  
Combustible Floor Base  
Low Fire Rate Kit - 3 Section BW4/BW5  
Low Fire Rate Kit - 4 Section BW4/BW5  
BW9  
DESCRIPTION  
PART NO.  
Concentric Vent Termination Kit (Single Pipe) - 2 in.  
Concentric Vent Termination Kit (Single Pipe) - 3 in.  
Filtrol Package (Up to 75,000 Btuh Input)  
Filtrol Package (Up to 150,000 Btuh Input)  
Zoning Valve 3/4 in.  
KGAVT0501CVT  
KGAVT0601CVT  
KBAFP0101DNK  
KBAFP0201DNK  
KBAZV0101DNK  
KBAZV0201DNK  
KBANP1101DNK  
KBANP1201DNK  
KBANP1301DNK  
KBAPN1101DNK  
KBAPN1201DNK  
KBAPN1301DNK  
Zoning Valve 1 in.  
Gas Conversion Kit Natural to Propane (BW9-050)  
Gas Conversion Kit Natural to Propane (BW9-075)  
Gas Conversion Kit Natural to Propane (BW9-100)  
Gas Conversion Kit Propane to Natural (BW9-050)  
Gas Conversion Kit Propane to Natural (BW9-075)  
Gas Conversion Kit Propane to Natural (BW9-100)  
* 2–6 Section Models on BS1, BS2, BW1, and BW2; 2–5 Section Models on BW3.  
† 7–9 Section Models on BS1, BS2, BW1, and BW2; 6–7 Section Models on BW3.  
Note: Accessory High Limit Control is a strap-on aquastat used as an auxiliary limit or reverse acting circulator control.  
—3—  
CIRCULATOR CURVE  
WATER FLOW M3/H  
1
2
3
4
5
12  
10  
8
3
2
6
4
1
2
0
4
8
12  
16  
20  
24  
WATER FLOW GPM  
WATER BOILER CIRCULATOR CURVE  
ELECTRICAL DATA  
ALL MODELS  
Voltage—Hertz—Phase  
115 — 60 — 1  
Minimum Branch Circuit Wire Size (AWG)  
Maximum Fuse Size (Amps)  
Control Circuit Power Available  
14  
15  
40va–@ 24v  
STANDARD BOILER WARRANTIES (Yrs)  
MODEL  
BW1  
3
BW2  
3
BW3  
3
BW4  
3
BW5  
3
BW9  
3
BS1  
BS2  
Circulator Pump  
Vent Damper  
5
5
20  
3
20  
3
5
5
Heat Exchanger Section Assembly (Non-prorated)  
Oil Burner  
20  
20  
20  
15  
12  
12  
®
CERTIFIED  
ama  
®
ASME  
—4—  
MODELS BW9  
The BW9 is a gas fired direct vent condensing hot water  
The BW9, unlike normal residential atmospheric and induced draft  
boilers, takes its combustion air directly from the outdoors (sealed  
combustion) and does not compete with building occupants for  
fresh air. Sealed combustion (also known as direct vent) is the  
safest and best way to obtain plenty of clean combustion air. The  
induced draft fan draws in the outside combustion air, then takes the  
cooler flue gases from the heat exchanger and provides a positive  
removal of the flue gases from the building through inexpensive and  
readily available PVC and CPVC pipes.  
boiler with cast aluminum heat exchanger sections. A  
revolutionary cast aluminum heat exchanger means better  
heat transfer and thermal storage than similarly sized cast  
iron boiler, which results in higher efficiency. The heating  
system water absorbs large amounts of heat from the cast  
aluminum heat exchanger, cooling the flue gases and  
causing condensation. Sealed combustion, premix gas  
burner, and low flame temperature means drastically  
reduced CO and NOx emissions, which contribute to a  
cleaner and healthier environment.  
FEATURES  
RANGE OF CAPACITIESThree sizes ranging from 50,000  
through 100,000 Btuh input.  
COMPLETELY PACKAGEDEach boiler is completely  
assembled, including all controls (except room thermostat). All  
necessary wiring is factory installed. The boiler is ready for gas  
piping, room thermostat, and electrical power connections as  
shipped. Circulator is shipped pre-wired with 6 ft bx conduit for  
easy installation for supply side pumping.  
VENTINGThis boiler is direct vented with PVC and CPVC pipe.  
See the Installation Instructions for common venting requirements.  
ALUMINUM SECTIONSThese sections speed heat transfer to  
the boiler water. With faster thermal response, greater comfort and  
economy are achieved.  
PRE-MIX BURNERProvides quiet operation and improved  
combustion efficiency.  
CONTROLSIntegrated Boiler Control provides safe,  
dependable operation of burners. Factory-installed safety  
components provide maximum safety against overheating,  
pressure buildup, and low-water operation.  
SECTIONS TESTEDEach section is hydrostatically tested to  
50 psig. Individual sections are tested to 125 psig at factory.  
Assembled sections are tested to 75 psig at the factory. The  
maximum allowable pressure is 50 psig for hot water boilers.  
PROPANE CONVERTIBLEWith factory approved conversion  
kit accessory.  
WARRANTYThe aluminum sections are covered by a limited  
15-year warranty on the entire assembly. Circulator pump is  
covered by a limited 3-year warranty. All other parts are covered  
by a 1-year limited warranty.  
SPECIFICATIONS  
UNIT SIZE  
050  
075  
100  
Sections  
1
GAS CONTROLS  
Gas Valve  
Honeywell  
Inlet Size  
In.  
1/2  
Ignition  
Hot Surface Ignition  
BurnerStainless/Titanium Alloy  
1
#48  
#44  
Burner Orifice  
No.  
0.0615  
CONTROLS  
Limit Control Range  
Pressure Relief Valve Setting  
Integrated Boiler Control  
CIRCULATOR  
°F  
100-200  
30  
Psig  
UTEC factory installed  
Taco  
Model  
In.  
007  
2.0 AMPS/330 WATTS  
1-1/4  
Full Load Amps  
Flange Size FPT  
5—  
DIMENSIONS  
MODEL BW9  
ALTERNATE OPENING  
FOR GAS SUPPLY  
BOILER WATER TEMPERATURE  
ALTERNATE SUPPLY  
& RETURN OPENINGS  
& PRESSURE GAUGE  
5" (127mm)  
(1-1/4" NPT (31.75mm)  
FRONT PANEL DOOR PULL  
CONNECTIONS  
PROVIDED INSIDE  
BOILER CABINET)  
VENT CONNECTION  
(2" CPVC) (50.8mm)  
DRAIN  
ACCESS PANEL  
CONDENSATE  
LEVELING FEET  
DRAIN FITTING  
(1/2" PVC) (12.7mm)  
OPENING FOR RELIEF VALVE  
DISCHARGE PIPE  
GAS SUPPLY  
OPENING  
(1/2" NPT) (12.7mm)  
OPENING FOR AIR  
VENT AND EXPANSION  
TANK CONNECTION  
JUNCTION BOX FOR 120 V POWER,  
120 V CIRCULATOR BEADS, AND  
24 V THERMOSTAT LEADS  
VENT CONNECTION  
(2" CPVC) (50.8mm)  
ALTERNATE GAS  
SUPPLY OPENING  
COMBUSTION AIR  
ALTERNATE BOILER WATER SUPPLY AND  
INTAKE FITTING  
RETURN  
(31.75mm) CONNECTIONS  
BOILER CABINET)  
(2" PVC) (50.8mm)  
ALTERNATE OPENING FOR  
VENT TEE  
(1-1/4" NPT  
PROVIDED INSIDE  
A99156  
STANDARD BOILER WATER  
SUPPLY & RETURN OPENINGS  
(1-1/4" NPT (31.75mm) CONNECTIONS  
PROVIDED INSIDE BOILER CABINET)  
CLEARANCES  
UNIT  
COMBUSTIBLE (in.)  
ACCESSIBILITY/CLEANING (in.)  
SERVICING (in.)  
TOP  
1
1
8
1
0
1
0
1
8
8
LEFT SIDE  
RIGHT SIDE  
BASE  
24  
24  
24  
24  
FRONT  
BACK  
INTAKE/VENT PIPING  
NEAR BOILER HOT WATER PIPING  
* Service clearance requirement 24-in.  
RATINGS AND CAPACITIES*  
BOILER  
WATER  
APPROX  
SHIP.  
GAS  
MAX INPUT  
(BTUH)  
HEATING  
NET RATING  
CAPACITY  
(GALLONS)  
UNIT  
TYPE  
Natural  
Natural  
Natural  
CAPACITY (BTUH)  
AFUE %  
Btuh†  
WT (Lb)  
BW9AAN050  
BW9AAN075  
BW9AAN100  
50,000  
75,000  
45,000  
90  
90  
90  
39,000  
59,000  
78,000  
2.6  
2.6  
2.6  
220  
220  
220  
68,000  
100,000  
90,000  
* Gas input ratings are for elevations up to 2000 ft. In the USA, for elevations above 2000 ft., reduce input per the charts supplied in the high altitude derate kits.  
In Canada, boilers may be used at high altitude by using a certified field conversion kit.  
6—  
MODELS BS1 and BS2  
Models BS1 and BS2 Gas-Fired Steam Boilers provide fast  
heat quietly and economically to assure the finest in hydronic  
heating.  
These boilers provide quality design in a small, compact unit  
easily installed in a basement, garage, or utility room. They  
can be installed on a combustible floor when an optional  
combustible floor base is used.  
The model BS1 and BS2 design is CSA and A.G.A. certified  
for use with natural and is convertible to propane gas with  
accessory kit.  
FEATURES  
RANGE OF CAPACITIESSizes 75,000 through 299,000 Btuh  
input are available.  
COMPLETELY PACKAGEDEach boiler is completely assem-  
bled, including all controls (except room thermostat). All necessary  
wiring is factory installed. The boiler is ready for gas, water, room  
thermostat, and electrical connections as shipped.  
THERMAL-PIN, CAST-IRON SECTIONSThese sections speed  
heat transfer from the flue gases to the boiler water, with faster ther-  
mostat response, providing greater comfort and economy. Max-  
imum heat is produced at a lower level on the thermal-pin sections,  
leading to peak efficiency.  
TITANIUM COMPOSITE BURNERSProvide quiet operation,  
corrosion resistance and improved combustion efficiency. Propane  
convertible with accessory kit.  
CONTROLSAn automatic gas valve and continuous pilot or  
intermittent pilot provide quiet, dependable operation of the  
burners. Factory-installed safety components assure protection  
against overheating, pressure buildup, and low-water operation.  
INSULATED CASINGThe casing is fully insulated with fiber-  
glass for maximum operating efficiency and economy.  
AUTOMATIC VENT DAMPERThe Model BS1 and BS2 is  
designed with automatic vent damper to recover chimney loss  
during off cycle.  
SECTIONS TESTEDEach section is hydrostatically tested to  
50 psig. Individual sections are tested to 125 psig at factory.  
Assembled sections are tested to 75 psig at the factory.  
Maximum allowable working pressure is 50 psig.  
maximum allowable pressure is 15 psig for steam boilers.  
The  
INTERGRAL DRAFTThese boilers incorporate an integral draft  
system to simplify installation. No external draft diverter is needed.  
WARRANTYThe cast-iron sections are covered by a non-  
prorated 12-year warranty on the entire assembly. Vent damper  
covered by 5-year warranty. All other parts are covered by a 1-year  
limited warranty.  
SPECIFICATIONS  
UNIT SIZE  
075  
112  
150  
187  
225  
262  
299  
GENERAL DATA  
SectionsFine Grain Cast Iron  
BurnersStainless/Titanium Alloy  
BurnersOrifice Drill Size  
GAS CONTROLS STANDING PILOT (BS1)  
Gas Valve  
No.  
No.  
3
2
4
3
5
4
6
5
7
6
8
7
9
8
Natural  
34  
34  
34  
34  
34  
34  
34  
Honeywell  
Honeywell  
Honeywell  
In.  
Inlet Size  
1/2 FPT  
1/2 FPT  
3/4 FPT  
3/4 FPT  
Pilot Assembly  
GAS CONTROLS INTERMITTENT PILOT (BS2)  
Gas Valve  
In.  
Inlet Size  
Pilot Assembly  
Spark Generator  
CONTROLS  
Low-Water Cutoff  
Honeywell  
Honeywell/UTEC  
McDonnell Miller  
015  
Pressuretrol  
Psig  
Setting  
Capacity  
Psig  
Pressure Relief Valve  
15 Psig  
400 lb/hr  
030  
Pressure Retard Gage Range  
Drain Cock  
In.  
3/4  
Vent Damper*  
In.  
5
6
7
* Factory authorized and listed, field installed.  
7—  
DIMENSIONS  
MODELS BS1 and BS2  
VENT  
DAMPER  
PRESSURE  
GAGE  
26 12″  
4 34″  
RELIEF  
VALVE  
2 12″  
TRANSFORMER  
GLASS  
GAGE  
PRESSURE  
LIMIT CONTROL  
WATER  
LINE  
2 12N.P.T.  
LOW WATER  
CUT-OFF  
29″  
LOW WATER  
CUT-OFF PROBE  
36 38″  
2 12″  
24″  
S86  
12 14″  
GAS  
VALVE  
GAS LINE  
A
LEFT SIDE  
FRONT  
RIGHT SIDE  
DIMENSIONS (In.)  
CLEARANCES (In.)  
UNIT SIZE  
A
VENT DIAMETER  
RIGHT SIDE  
LEFT SIDE  
TOP  
6*  
6*  
6*  
6*  
6*  
075  
112  
150  
187  
225  
262  
299  
11-1/4  
14-1/2  
17-3/4  
21  
5
6
6
7
7
7
7
BACK  
FRONT  
24-1/4  
27-1/2  
30-3/4  
* Service clearance requirement 24 in.  
RATINGS AND CAPACITIES*  
NUMBER  
MAX  
HEATING  
NET RATING  
APPROX  
SHIP.  
GAS  
OF  
INPUT  
(BTUH)  
CAPACITY  
(BTUH)  
AFUE %  
UNIT  
TYPE  
SECTIONS  
Btuh  
Sq Ft  
196  
283  
383  
479  
571  
671  
767  
196  
283  
383  
479  
575  
671  
767  
(WITH DAMPER)  
WT (Lb)  
BS1AAN075  
BS1AAN112  
BS1AAN150  
BS1AAN187  
BS1AAN225  
BS1AAN262  
BS1AAN299  
BS2AAN075  
BS2AAN112  
BS2AAN150  
BS2AAN187  
BS2AAN225  
BS2AAN262  
BS2AAN299  
Natural  
Natural  
Natural  
Natural  
Natural  
Natural  
Natural  
Natural  
Natural  
Natural  
Natural  
Natural  
Natural  
Natural  
3
4
5
6
7
8
9
3
4
5
6
7
8
9
75,000  
112,500  
150,000  
187,500  
225,000  
262,500  
299,000  
75,000  
62,000  
91,000  
47,000  
68,000  
92,000  
115,000  
137,000  
161,000  
184,000  
47,000  
68,000  
92,000  
115,000  
137,000  
161,000  
184,000  
81.1  
256  
404  
483  
564  
649  
719  
800  
256  
404  
483  
564  
649  
719  
800  
78.8  
122,000  
153,000  
183,000  
214,000  
245,000  
62,000  
79.2  
79.6  
80.1  
80.5  
80.9  
82.7  
112,500  
150,000  
187,500  
225,000  
262,500  
299,000  
91,000  
80.4  
122,000  
153,000  
183,000  
214,000  
245,000  
80.6  
80.9  
81.1  
81.3  
81.6  
* Ratings are for altitudes to 2000 ft. Ratings for units for altitudes over 2000 ft are 4% less for each 1000 ft above sea level. Ratings in sq ft are computed at  
240 Btuh/sq ft for steam boilers.  
8—  
MODELS BW1 and BW2  
Models BW1 and BW2 Gas-Fired Hot Water Boilers provide  
fast heat quietly and economically to assure the finest in  
hydronic heating.  
These boilers provide quality design in a small, compact unit  
easily installed in a basement, garage, or utility room. They  
can be installed on a combustible floor when an optional  
combustible floor base is used.  
The models BW1 and BW2 design is CSA and A.G.A.  
certified for use with natural and is convertible to propane gas  
with accessory kit.  
FEATURES  
RANGE OF CAPACITIESSizes 37,500 through 280,000 Btuh are  
available.  
COMPLETELY PACKAGEDEach boiler is completely assembled,  
including all controls (except room thermostat). All necessary wiring is  
factory installed. The boiler is ready for gas, water, room thermostat,  
and electrical connections as shipped.  
THERMAL-PIN, CAST-IRON SECTIONSThese sections speed  
heat transfer from the flue gases to the boiler water with faster  
thermostat response, providing greater comfort and economy.  
Maximum heat is produced at a lower level on the thermal-pin sections,  
leading to peak efficiency.  
INTEGRAL DRAFTThese boilers incorporate an integral draft sys-  
tem to simplify installation. No external draft diverter is needed.  
TITANIUM COMPOSITE BURNERSProvide quiet operation,  
corrosion resistance and improved combustion efficiency. Propane  
convertible with accessory kit.  
CONTROLSAn automatic gas valve and continuous pilot or inter-  
mittent pilot provide quiet, dependable operation of the burners.  
Factory-installed safety components assure protection against  
overheating, pressure buildup, and low-water operation.  
INSULATED CASINGThe casing is fully insulated with fiberglass for  
maximum operating efficiency and economy.  
AUTOMATIC VENT DAMPERThe Model BS1 and BS2 is  
designed with automatic vent damper to recover chimney loss  
during off cycle.  
SECTIONS TESTEDEach section is hydrostatically tested to  
50 psig. Individual sections are tested to 125 psig at factory.  
Assembled sections are tested to 75 psig at the factory. The  
maximum allowable pressure is 50 psig for hot water boilers.  
WARRANTYThe cast-iron sections are covered by a non-prorated  
20-year warranty on the entire assembly. Vent damper covered by 5-  
year warranty. Circulator pump covered by 3-year warranty. All other  
parts are covered by a 1-year limited warranty.  
SPECIFICATIONS  
UNIT SIZE  
037  
070  
105  
140  
175  
210  
245  
280  
GENERAL DATA  
SectionsFine Grain Cast Iron  
BurnersStainless/Titanium Alloy  
BurnersOrifice Drill Size  
GAS CONTROLS STANDING PILOT (BW1)  
Gas Valve  
No.  
No.  
2
1
3
2
4
3
5
4
6
5
7
6
8
7
9
8
Natural  
34  
34  
34  
34  
34  
34  
34  
34  
Honeywell  
In.  
Inlet Size  
1/2 FPT  
1/2 FPT  
3/4 FPT  
3/4 FPT  
Pilot Assembly  
Honeywell  
Honeywell  
GAS CONTROLS INTERMITTENT PILOT (BW2)  
Gas Valve  
In.  
Inlet Size  
Pilot Assembly  
Spark Generator  
CONTROLS  
Honeywell  
Honeywell/UTEC  
Limit Control Range  
°F  
140240  
1070  
60320  
30  
Pressure/Temperature Gage  
Psig  
°F  
Pressure Relief Valve Setting  
Circulator RelayAquastat  
Vent Damper*  
Psig  
Honeywell (Factory Installed)  
6
In.  
Model  
In.  
4†  
5
7
CIRCULATOR  
Taco  
007  
0.70  
1-1/4  
Full Load Amps  
Flange Size FPT  
* Factory authorized and listed, field installed.  
A 4-in. vent damper is supplied. A 4-in. to 3-in. reducer is also furnished.  
9—  
DIMENSIONS  
BW1 and BW2 MODELS  
VENT  
DAMPER  
TEMPERATURE/  
1 14SUPPLY  
ASME  
RELIEF  
VALVE  
AQUASTAT  
PRESSURE GAGE  
26 12″  
A
4 34″  
8″  
1 14″  
1 14NPT  
RETURN  
SPILL  
SWITCH  
31 38″  
23 14″  
12 14″  
5 38″  
ROLLOUT  
SWITCH  
DRAIN VALVE  
LEFT SIDE  
INT. PILOT  
CONTROL  
GAS  
VALVE  
FRONT  
RIGHT SIDE  
DIMENSIONS (In.)  
CLEARANCES (In.)  
UNIT SIZE  
037  
A
VENT CONNECTION  
6 (2-5 Section)*  
RIGHT SIDE  
LEFT SIDE  
24 (6-9 Section)*  
8
3
5
6
6
7
7
7
7
6 (2-5 Section)  
24 (6-9 Section)  
070  
11-1/4  
14-1/2  
17-3/4  
21  
105  
TOP  
6
140  
BACK  
FRONT  
6
175  
6*  
210  
24-1/4  
27-1/2  
30-3/4  
* Service clearance requirement 24 in.  
245  
280  
RATINGS AND CAPACITIES*  
NUMBER  
MAX  
INPUT  
(BTUH)  
HEATING  
NET  
APPROX  
AFUE %  
GAS  
OF  
CAPACITY  
(BTUH)  
RATING  
(BTUH)  
SHIP.  
BW1, BW2  
TYPE  
Natural  
Natural  
Natural  
Natural  
Natural  
Natural  
Natural  
Natural  
SECTIONS  
BW1  
80.0  
80.4  
80.4  
80.3  
80.2  
80.1  
80.0  
80.0  
BW2  
81.4  
81.6  
81.5  
81.3  
81.1  
81.0  
81.6  
80.7  
WT (Lb)  
AAN037  
AAN070  
AAN105  
AAN140  
AAN175  
AAN210  
AAN245  
AAN280  
2
3
4
5
6
7
8
9
37,500  
70,000  
30,000  
57,000  
26,000  
50,000  
227  
285  
350  
421  
488  
564  
626  
689  
105,000  
140,000  
175,000  
210,000  
245,000  
280,000  
85,000  
74,000  
113,000  
142,000  
170,000  
198,000  
226,000  
98,000  
124,000  
148,000  
172,000  
197,000  
* Ratings are for altitudes to 2000 ft. Unit ratings for altitudes over 2000 ft are 4% less for each 1000 ft above sea level.  
10—  
MODEL BW3  
Model BW3 Gas-Fired Induced-Combustion Water Boilers  
FEATURES  
are the answer to energy-efficient residential hydronic  
heating. They provide fast, almost instant, heat quietly and  
economically.  
These boilers provide quality design in a small, compact unit  
easily installed in a basement, garage, or utility room. They  
can be installed on a combustible floor when an optional  
combustible floor kit is used.  
The design of model BW3N is CSA and A.G.A. certified for  
use with natural gas and is convertible to propane gas with  
accessory kit.  
RANGE OF CAPACITIESSix sizes ranging from 42,500 through  
225,000 Btuh input.  
COMPLETELY PACKAGEDEach boiler is completely assembled,  
including all controls (except room thermostat). All necessary wiring is  
factory installed. The boiler is ready for gas, water, room thermostat,  
and electrical power connections as shipped.  
VENTINGThis boiler can be vented into any approved chimney or  
Type B-1 vent. Common-venting with an existing water heater is  
acceptable in vertical vent systems. See the Installation Instructions  
for common venting requirements. The induced-combustion design  
also eliminates the need for a vent damper.  
THERMAL-PIN CAST-IRON SECTIONSThese sections speed  
heat transfer from the flue gases to the boiler water, with faster ther-  
mostat response, providing greater comfort and economy.  
TITANIUM COMPOSITE BURNERSProvide quiet operation,  
corrosion resistance, and improved combustion efficiency. Propane  
convertible with accessory kit.  
CONTROLSAn automatic gas valve and intermittent pilot provide  
quiet, dependable operation of the burners. Factory-installed safety  
components provide maximum safety against overheating, pressure  
buildup, and low-water operation.  
INSULATED CASINGFully insulated with fiberglass for maximum  
operating efficiency and economy.  
SECTIONS TESTEDEach section is hydrostatically tested to  
50 psig. Individual sections are tested to 125 psig at factory.  
Assembled sections are tested to 75 psig at the factory. The  
maximum allowable pressure is 50 psig for hot water boilers.  
UNIT CONVERTIBLEThe Boiler is listed for power venting with field  
controls power venting kit.  
WARRANTYThe cast-iron sections are covered by a non-prorated  
20-year warranty on the entire assembly. Circulator pump covered by  
3-year warranty. All other parts are covered by a 1-year limited  
warranty.  
SPECIFICATIONS  
UNIT SIZE  
042  
075  
112  
150  
187  
225  
SectionsFine Grain Cast-Iron  
No.  
2
3
4
5
6
7
GAS CONTROLS INTERMITTENT PILOT  
Gas Valve  
Honeywell  
1/2 FPT  
In.  
Inlet Size  
Pilot Assembly  
Honeywell  
Honeywell  
Spark Generator  
BurnersStainless/Titanium Alloy  
Burner OrificeDrill Size  
No.  
1
2
3
4
5
6
Natural  
32  
34  
34  
34  
34  
34  
CONTROLS  
Limit Control Range  
Pressure/Temperature Gage  
°F  
Psig  
°F  
180240  
060  
60260  
30  
Pressure Relief Valve Setting  
Circulator RelayAquastat  
CIRCULATOR  
Psig  
Honeywell (Factory Installed)  
Taco  
Model  
In.  
007  
0.70  
1-1/4  
Full Load Amps  
Flange Size FPT  
11—  
DIMENSIONS  
BW3 MODELS  
1 14SUPPLY  
23 14″  
VENT  
CONNECTOR  
A
COMBINATION  
LIMIT & RELAY  
CONTROL  
RELIEF  
VALVE  
TEMP  
PRESSURE  
GAGE  
1 14RETURN  
BLOWER  
29″  
25 14″  
23″  
PRESSURE  
SWITCH  
5 58″  
5 58″  
CIRCULATOR  
INT. PILOT  
CONTROL  
BURNER  
1 34″  
GAS  
7″  
FRONT  
VALVE  
LEFT SIDE  
RIGHT SIDE  
DIMENSIONS (In.)  
CLEARANCES (In.)  
UNIT SIZE  
042  
A
VENT CONNECTION  
RIGHT SIDE  
LEFT SIDE  
TOP  
6*  
6
11  
4*  
4*  
4*  
4*  
4*  
4*  
075  
14-1/4  
17-1/2  
20-3/4  
24  
6
112  
BACK  
6
150  
FRONT  
6*  
187  
*Service clearance requirement 24 in.  
225  
27-1/4  
*With factory-supplied adapter installed.  
RATINGS AND CAPACITIES*  
RATINGS  
HEATING  
BOILER  
WATER  
APPROX  
SHIP.  
CAPACITY‡  
NET RATING  
GAS  
MAX INPUT  
(BTUH)  
CAPACITY  
(GALLONS)  
UNIT  
TYPE  
Natural  
Natural  
Natural  
Natural  
Natural  
Btuh  
36,000  
63,000  
94,000  
125,000  
155,000  
AFUE %  
84.4  
Btuh†  
31,000  
55,000  
82,000  
109,000  
135,000  
WT (Lb)  
BW3AAN042  
BW3AAN075  
BW3AAN112  
BW3AAN150  
BW3AAN187  
42,500  
75,000  
1.75  
3.00  
4.25  
5.50  
6.75  
211  
263  
320  
369  
418  
83.4  
112,500  
150,000  
187,500  
83.0  
82.7  
82.3  
* Gas input ratings are for elevations up to 2000 ft. For elevations above 2000 ft, reduce input 4% for each 1000 ft above sea level.  
Selection factors providing for piping loss and starting load are those recommended by the Institute of Boiler and Radiator Manufacturers. Net water boiler  
ratings are based on an allowance of 1.15.  
In accordance with U.S. Government test procedures.  
12—  
MODELS BW4 and BW5  
The modern design and attractive appearance of the models  
provides efficient fuel usage. A wet base cast iron block with thermal  
pins surrounds the combustion area for better heat transfer from flue  
gases to water.  
BW4 and BW5 Oil-Fired Water Boilers make them ideal for  
installation in any area. The boilers are shipped fully  
assembled and wired, including all controls (except barometric  
draft regulator). The compact 22-gage steel cabinet has a  
baked-on enamel paint finish for durability. A 1-in. layer of  
thermal insulation is applied inside the jacket for protection  
and thermal efficiency. The flame retention head burner  
FEATURES  
BAROMETRIC DRAFT CONTROLThe factory supplied  
barometric draft control can easily be installed in the vent pipe for  
optimum draft and combustion efficiency.  
CONTROLSFactory-wired controls on units with tankless hot  
water coil include a triple aquastat relay with high/low limit  
protection and circulator control.  
COMBINATION TRANSFORMER AQUASTATA 24-v  
transformer is combined with the aquastat assembly. The  
transformer will supply power efficient to power a 3-zone system  
on BW5 models. Factory installed combination pressure/  
temperature gage and a pressure relief valve.  
COIL OPTIONSUnits are available with or without tankless  
heater coil. The coil provides a supply of hot water for normal  
domestic purposes or an accessory tankless heater coil can be  
added later.  
FACTORY INSTALLED FEATURESA factory-installed drain is  
provided should the boiler ever need to be drained. Oil primary  
control prevents boiler in operation in the event of flame loss.  
SECTIONS TESTEDEach section is hydrostatically tested to 50  
psig. Individual sections are tested to 125 psig at factory.  
Assembled sections are tested to 75 psig at the factory. The  
maximum allowable pressure is 50 psig for hot water boilers.  
EASE OF INSTALLATIONCirculator is shipped pre-wired  
with 6 ft bx conduit for easy installation for supply side pumping.  
WARRANTYThe cast-iron sections are covered by a non-  
prorated 20-year warranty on the entire assembly. Oil burner and  
circulator pump covered by 3-year warranty. All other parts are  
covered by a 1-year limited warranty.  
SOLENOID OIL VALVEThis provides cleaner burning and  
quieter operation. Valve is included on all burner types.  
SWING BURNER DOORThis unique design offers uninhibited  
access for set-ups, service, and maintaining the burner. Routine  
cleaning is also much easier.  
SPECIFICATIONS  
UNIT SIZE  
120  
181  
239  
GENERAL DATA  
Sections Fine Grain Cast Iron  
Water Capacity  
No.  
Gal  
3
4
5
9.6  
11.6  
13.7  
Combustion Chamber Target Wall  
Draft Regulator  
Ceramic Fiber  
Furnished  
OIL BURNER  
Type Manufacturer/Model  
Oil Pump  
Beckett/Model AFG Flame Retention Head Burner  
Single Stage  
No. 1 or 2 Fuel Oil  
3 Amps  
Fuel Type  
Rated Load Amps  
CONTROLS  
Combination Control  
Without Heater  
High Limit, Circulator Relay, & Cad. Cell Relay  
With Heater  
Psig  
High & Low Limit, Circulator Relay, & Cad. Cell Relay  
Pressure/Temperature Gage  
060  
60260  
30  
°F  
Psig  
ASME Pressure Relief Valve  
CIRCULATOR  
Taco  
Model  
In.  
007  
0.70  
1-1/4  
Full Load Amps  
Flange Size FPT  
13—  
DIMENSIONS  
MODELS BW4 and BW5  
1 14SUPPLY  
GAGE  
C
B
CONTROL  
1 14″  
RETURN  
36″  
34ASME  
RELIEF  
VALVE  
TANKLESS  
HEATER  
12N.P.T.  
19 58″  
FRONT  
9″  
A
SIDE  
REAR  
DIMENSIONS (In.)  
CLEARANCES (In.)  
UNIT SIZE  
140  
A
B
6
6
6
C
RIGHT SIDE  
LEFT SIDE  
TOP  
16*  
16*  
16*  
16*  
16†  
18*  
17-3/4  
21  
9-3/4  
11-3/8  
13  
210  
280  
24-1/4  
BACK  
FRONT  
FLUE  
* Clearance 18 in. for BW5.  
Service clearance requirement 24 in.  
RATINGS AND PERFORMANCE  
**HEAT-  
ING CA-  
NET  
I=B=R  
FIRING  
RATE  
+GPH  
INPUT  
*MBH  
PACITY RATING  
MINIMUM CHIMNEY  
SIZE/ HEIGHT  
BOILER MODEL NO.  
NO. SEC.  
*MBH  
*MBH  
A.F.U.E. ++  
DIMENSIONS - IN.  
WITH TANKLESS WITHOUT TANKLESS  
COIL  
COIL  
A
B
6
6
6
6
6
6
6
6
6
C
8
BW5BAH091  
BW5BAH105  
BW5BAH140  
BW5BAH126  
BW5BAH175  
BW5BAH210  
BW5BAH168  
BW5BAH245  
BW5BAH280  
BW4BAH091  
BW4BAH105  
BW4BAH140  
BW4BAH126  
BW4BAH175  
BW4BAH210  
BW4BAH168  
BW4BAH245  
BW4BAH280  
3
3
3
4
4
4
5
5
5
91  
80  
70  
80  
0.65  
0.75  
1
86.3  
85.2  
83.4  
86.0  
83.9  
82.4  
86.5  
83.6  
82.0  
8-in. x 8-in. x 15 ft  
8-in. x 8-in. x 15 ft  
8-in. x 8-in. x 15 ft  
8-in. x 8-in. x 15 ft  
8-in. x 8-in. x 15 ft  
8-in. x 8-in. x 15 ft  
8-in. x 8-in. x 15 ft  
8-in. x 8-in. x 15 ft  
8-in. x 8-in. x 20 ft  
14-1/2  
14-1/2  
14-1/2  
17-3/4  
17-3/4  
17-3/4  
21  
105  
140  
126  
175  
210  
168  
245  
280  
92  
8
119  
111  
150  
178  
147  
209  
236  
103  
97  
8
0.9  
1.25  
1.5  
1.2  
1.75  
2
9-5/8  
9-5/8  
9-5/8  
11-1/2  
11-1/2  
11-1/2  
130  
155  
128  
182  
205  
21  
21  
* MBH = 1,000 BTU per hour / BTU = British Thermal Unit.  
** Heating Capacity is based on a 13 percent C02 with a 0.02 in. wc and a #1 smoke or less. Testing was done in accordance with the D.O.E. (Department of  
Energy) test procedure.  
+GPH = Gallons per hour oil at 140,000 BTU per gallon.  
++A.F.U.E. = Annual Fuel Utilization Efficiency based upon D.O.E. test procedure.  
As an Energy Star Partner, the manufacturer has determined that this product meets Energy Star guidelines for Energy Efficiency.  
14—  
15—  
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE  
UNIT MUST BE INSTALLED IN ACCORDANCE  
WITH INSTALLATION INSTRUCTIONS  
Cancels: PDS BSIA.75.2  
© 2001 Bryant Heating & Cooling Systems, 7310 W. Morris St., Indpls., IN 46231  
PRINTED IN U.S.A  
Catalog No. 12BS-1A1  
3-01  

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