Bryan “Flexible Water Tube”
AB Series
Steam & Water Boilers
900,000 to 3,000,000 BTUH
Forced draft gas, oil or dual fuel fi red
Form No. 7510
(Rev. 6/05)
Water Boiler
AB120-W-FDGO
Steam Boiler
AB250-S150-FDG
BRYAN® BOILERS
Originators of the “Flexible Water Tube” design
Low initial cost, high operating effi ciency
deliver substantial return on investment
• True “fl exible water tube”
design guaranteed shock free
• Longer lasting with better
performance
• Full fi ve sq ft of heating
surface per BHP
Quality Construction Features:
A. Water side or steam side interior ac cessible for
clean out and inspection, front and rear open ings,
upper and lower drums.
B. Large volume water leg down comers promote
rapid internal circulation, temperature equalization and
effi cient heat transfer.
C. Boiler tube and furnace area access panels: heavy
gauge steel casing with 2" high-temperature ceramic fi ber
insulation, bolted and tightly sealed to boiler frame.
D. Flame observation port in access door at rear of boiler.
E. Single side access; combustion chamber, tubes and burner
head are completely accessible from one side simplifying
maintenance and minimizing fl oor space.
F. Minimum sized fl ue vent.
G. Control panel: all controls installed with connections to
terminal strip.
H. Forced draft, fl ame retention head type burner. Effi cient
combustion of oil or gas, plus quiet operation.
I. Heavy steel boiler frame, built and stamped in accordance
with the appropriate ASME Boiler Code.
J. Heavy gauge steel boiler jacket with rust-resistant zinc
coating and enamel fi nish, insulated with 1½" fi berglass to
ensure exceptionally cool outer surface.
A
J
C
K
B
D
I
L
K. Bryan bent water tubes
are fl exible, individually
replaceable without welding
or rolling. Never more than
two tube confi gurations.
L. Pressurized design
fi rebox with internal watercooled furnace with low
heat release rate.
M. Steam boilers with extra
large drum with high steam
release area ensure stable
water level and dry steam.
F
M
G
H
E
Bryan AB Series Boiler Specifi cations
BOILER
MODEL
AB90-W 900 (264) 720 (211) 21 (211) 752 (220) 22 (220) — 113 (10.5) 2,000 (907)
AB90-S 900 (264) 720 (211) 21 (211) — — 742 (337) 113 (10.5) 2,600 (1,179)
AB120-W 1,200 (352) 960 (281) 29 (281) 1,002 (294) 30 (294) — 148 (13.8) 2,250 (1,021)
AB120-S 1,200 (352) 960 (281) 29 (281) — — 990 (449) 148 (13.8) 3,050 (1,384)
AB150-W 1,500 (440) 1,200 (352) 36 (352) 1,253 (367) 37 (367) — 184 (17.1) 2,550 (1,157)
AB150-S 1,500 (440) 1,200 (352) 36 (352) — — 1,237 (561) 184 (17.1) 3,500 (1,588)
AB200-W 2,000 (586) 1,600 (469) 48 (469) 1,670 (489) 50 (489) — 244 (22.7) 3,050 (1,384)
AB200-S 2,000 (586) 1,600 (469) 48 (469) — — 1,649 (748) 244 (22.7) 4,150 (1,882)
AB250-W 2,500 (733) 2,000 (586) 60 (586) 2,088 (612) 62 (612) — 303 (28.2) 3,500 (1,588)
AB250-S 2,500 (733) 2,000 (586) 60 (586) — — 2,062 (935) 303 (28.2) 4,800 (2,177)
AB300-W 3,000 (879) 2,400 (703) 72 (703) 2,505 (734) 75 (734) — 350 (32.5) 3,750 (1,701)
AB300-S 3,000 (879) 2,400 (703) 72 (703) — — 2,474 (1,122) 350 (32.5) 5,100 (2,313)
NOTES: (1) W = Water / S = Steam
(2) Output and horsepower based on boiler industry standard of 80% of input.
(3) Output and horsepower based on an average natural gas combustion effi ciency of 83.5% for hot water boiler. Actual combustion effi ciencies for oil will be higher.
(4) Lbs. steam per hour from and at 212°F.
INPUT
MBH
(1)
(KW)
OUTPUT@ 80%
EFFICIENCY
MBH (KW)
(2)
HP (KW)
OUTPUT@ 83.5%
EFFICIENCY
MBH (KW)
(3)
HP (KW)
STEAM OUTPUT
LBS/HR (KG/HR)
(4)
HEATING
SURFACE
SQ. FT. (M
2
)
APPROX.
SHIP
LBS. (KG)
Guaranteed effi ciency and easy
maintenance assure low cost operation
All Bryan AB Series boilers offer these operating and performance features
Guaranteed effi ciency
The breakthrough in water tube boiler design that produced the AB Series provides operating effi ciency so
reliable, we guarantee it to be 83.5% for hot water boilers
and 82% - 15 PSI / 80% - 150 PSI or better for steam.
The Bryan Flexible Tube
Bryan’s exclusive “Flexible Tube” design
eliminates the possibility of damage
from so-called “thermal
shock.” Tubes are easily removable and replaceable,
without welding or rolling,
eliminating long, expensive
downtime should repairs
ever be required.
Water cooled furnace
Water
Boiler
The confi guration of the
water tubes provides a
water cooled combustion
chamber. A high percentage of the heating surface is exposed to direct radiant
heat, increasing water velocities and heat transfer.
Large steam drum
The steam drum has generous water volume and steam
release area. This design, along with effective drum
internal functions, results in a stable water level and
produces extremely dry steam at all load conditions.
Accessibility of furnace and tube area
Inner panel provides easy and complete access to furnace and boiler tube area, as well as to burner head. All
panels are heavily insulated and sealed to boiler frame.
All access is from only one side.
Compact design, minimum fl oor space
With our compact water tube design, the overall size
of the unit is less than most other types of boilers, yet
maintains a full fi ve square feet of heating surface area
per HP. Needing only 24" for tube removal, and on only
one side of the boiler, the AB Series boiler occupies very
little space in the boiler room. This can result in considerable savings in building costs. Pressurized fi ring permits
minimum sized breaching and vent.
Multi-pass fl ue gas travel
High velocity four-pass fl ue gas travel is obtained by a
unique baffl ing system. This contributes to maximum fi re
side heat transfer and overall high boiler effi ciencies.
Thermal blend water return
Bryan’s unique “thermal blend” return blends cold or
cooler return water with warmer boiler water abridging it
to design operating temperatures. An injector tube directs
the “mixed” water fl ow through the downcomer to the
lower header and heating surfaces at a temperature above
possible condensing conditions. This reduces the possibility of “cold spots” and
damage from corrosive
condensation.
Steam
Boiler
Positive internal
circulation
Each pass of the Bryan
water tube slopes upward. This confi guration,
along with the large
volume downcomer
water legs, provides the
extremely rapid natural
thermal internal circulation, promoting both high
effi ciency of heat transfer and
uniform temperature throughout the
boiler. Eliminating stress damage caused
by unequal temperature distribution is especially
important for heating systems, particularly where intermittent or continuous low temperature water returns may
be encountered.
Bryan AB Series Boilers Standard and Optional Equipment
STANDARD EQUIPMENT FURNISHED
Water boiler
Combination thermometer and altitude gauge, ASME Code rated boiler
relief valve, water temperature control
(240°F max std.), high limit control,
probe LWCO.
Steam boiler
Steam pressure gauge, steam pressure control, combination low water
cutoff and pump control, auxiliary
low water cutoff, high limit pressure
control, ASME-rated safety valve,
water glass set.
Straight gas fi red unit
Electronic combustion safety control, automatic operating gas valve,
safety gas valve, pilot solenoid valve,
pilot ignition assembly, main manual
gas shut-off valve, pilot cock, pilot
and main gas pressure regulators,
air safety switch, control panel, all
controls installed and wired.
Straight oil fi red unit
Electronic combustion safety control,
dual oil valves oil ignition transformer,
two-stage fuel unit, direct spark
ignition of oil, oil nozzle assembly,
control panel, all controls installed
and wired.
Combination gas-oil unit
Electronic combustion safety control,
automatic operating gas valve, safety
gas valve, pilot solenoid valve, pilot
ignition assembly, main manual gas
shut-off valve, pilot cock, pilot and
main gas pressure regulators, air
safety switch, manual fuel selector
switch, dual oil valves, gas pilot for
both fuels, two-stage fuel unit, nozzle
assembly, control panel, all controls
installed and wired.
OPTIONAL EQUIPMENT,
EXTRA COST
1. Manual reset high limit control
2. Manual reset low water cutoff
3. Auxiliary low water cutoff
4. Combination low water cutoff
and feeder
5. Alarm bells or horns
6. UL, CUL, CSD-1, FM, IRI or
other insurance approved
control systems
7. Indicating lights, as desired
8. Lead-lag systems for two or
more boilers with or without
outdoor reset control
9. Draft control system
10. Low NOx package
OPTIONAL CONSTRUCTION
Steam boiler
Optional construction to ASME Power
Boiler Code requirements for pressure
exceeding 150 psi to maximum of 300
psi design pressure.
Hot water boiler
Optional construction to ASME
Power Boiler Code requirements for
temperatures exceeding 240°F and/or
pressure exceeding 160 psi to maximum of 285° F operating and 300° F
design temperature and 250 psi.
When ordering, please specify:
1. Boiler size
2. Supply and return temperatures required
3. Boiler relief valve setting
4. Type of fuel: natural, LP, or
other gas and/or No. 2 oil
5. If gas, type, BTU content,
specifi c gravity and pressure
available
6. Electric power voltage, phase
and frequency
7. Optional extra equipment or
construction
8. Special approvals required
(UL, CUL, CSD-1, FM, or IRI)
9. Altitude
Bryan AB Series Steam & Hot Water Boilers
STEAM BOILER DIMENSIONS — inches (cm)
A B C D E F G H I J K L
Boiler Length Width Height Gas Train
Model of Outside Over
Number Jacket Jacket Jacket
AB-90
AB-120
AB-150
AB-200
AB-250
AB-300
15
44
/16 381/2 771/4 76 11/4 4 FLG 3 NPT 11/
(114.1) (97.79) (196.21) (193.0) (3.2) (10.16) (7.62) (3.81) (25.4) (30.5) (91.4) (60.9) (202.24)
3
54
/16 381/2 771/4 853/8 1
(137.6) (97.79) (196.21) (216.8) (3.2) (10.16) (7.62) (3.81) (25.4) (30.5) (91.4) (60.9) (202.24)
1
63
/2 381/2 771/4 943/4 1
(161.3) (97.79) (196.21) (260.7) (3.8) (15.24) (7.62) (3.81) (25.4) (30.5) (91.4) (60.9) (202.24)
15
78
/16 381/2 771/4 110 2 6 FLG 3 NPT 11/
(200.5) (97.79) (196.21) (279.4) (5.1) (15.24) (7.62) (3.81) (25.4) (41.9) (91.4) (60.9) (202.24)
7
94
/16 381/2 771/4 1251/2 2 6 FLG 3 NPT 11/
(239.9) (97.79) (196.21) (318.8) (5.1) (15.24) (7.62) (3.81) (30.5) (38.1) (91.4) (60.9) (202.24)
13
108
/16 381/2 771/4 14015/16 2 6 FLG 3 NPT 11/
(276.4) (97.79) (196.21) (358.0) (5.1) (15.24) (7.62) (3.81) (30.5) (38.1) (91.4) (60.9) (202.24)
Overall
Connection
Length
(Approx.) 15 psi 150 psi
1
/4 4 FLG 3 NPT 11/
1
/2 6 FLG 3 NPT 11/
Supply
Nozzle
Clearance for Min. Tube Floor to
Return Flue Flue
Conn. Size Location
2
NPT 10 12 36 24 795/
2
NPT 10 12 36 24 795/
2
NPT 10 12 36 24 795/
2
NPT 10 161/2 36 24 795/
2
NPT 12 15 36 24 795/
2
NPT 12 15 36 24 795/
Servicing Removal Flow
Burner Clearance Nozzle
8
8
8
8
8
8
WATER BOILER DIMENSIONS — inches (cm)
A B C D E F G H I J K L
Boiler Length Width Height Gas Train Clearance for Min. Tube Floor to
Model of Outside Over
Number Jacket Jacket Jacket
15
AB-90
AB-120
AB-150
AB-200
AB-250
AB-300
44
/16 343/4 691/2 76 11/4 3-F 3-F 10 12 36 24 747/
(114.1) (88.3) (176.5) (193.0) (3.2) (7.6) (7.6) (25.4) (30.5) (91.4) (60.9) (190.2)
3
54
/16 343/4 691/2 853/8 1
(137.6) (88.3) (176.5) (216.8) (3.2) (7.6) (7.6) (25.4) (30.5) (91.4) (60.9) (190.2)
1
63
/2 343/4 691/2 943/4 1
(161.3) (88.3) (176.5) (260.7) (3.8) (7.6) (7.6) (25.4) (30.5) (91.4) (60.9) (190.2)
15
78
/16 343/4 691/2 110 2 3-F 3-F 10 161/2 36 24 747/
(200.5) (88.3) (176.5) (279.4) (5.1) (7.6) (7.6) (25.4) (41.9) (91.4) (60.9) (190.2)
7
94
/16 343/4 691/2 1251/2 2 3-F 3-F 12 15 36 24 747/
(239.9) (88.3) (176.5) (318.8) (5.1) (7.6) (7.6) (30.5) (38.1) (91.4) (60.9) (190.2)
13
108
/16 343/4 691/2 14015/16 2 3-F 3-F 12 15 36 24 747/
(276.4) (88.31) (176.5) (353.0) (5.1) (7.6) (7.6) (30.5) (38.1) (91.4) (60.9) (190.2)
Specifi cations subject to change without notice. Consult factory to consult on other boiler options.
Overall
Length
Connection
(Approx.)
Supply Return Flue Flue
Nozzle Nozzle Size Location
1
/4 3-F 3-F 10 12 36 24 747/
1
/2 3-F 3-F 10 12 36 24 747/
Servicing Removal Flow
Burner Clearance Nozzle
Bryan Steam LLC — Leaders Since 1916
783 N. Chili Ave., Peru, Indiana 46970 U.S.A.
Phone:765-473-6651 • Internet:www.bryanboilers.com
Fax: 765-473-3074 • E-mail: bryanboilers@iquest.net
8
8
8
8
8
8
Form No. 7510 ©2005 Bryan Steam LLC Printed in USA
65-7097
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