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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 pro-
duced 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 re-
movable and replaceable,
without welding or rolling,
eliminating long, expensive
downtime should repairs
ever be required.
Water cooled furnace
The confi guration of the
water tubes provides a
water cooled combustion
chamber. A high percent-
age 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 fur-
nace 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
Water boiler
Combination thermometer and alti-
tude 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 pres-
sure 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 con-
trol, 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,
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 consider-
able 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 possi-
bility of “cold spots” and
damage from corrosive
condensation.
Positive internal
circulation
Each pass of the Bryan
water tube slopes up-
ward. This confi guration,
along with the large
volume downcomer
water legs, provides the
extremely rapid natural
thermal internal circula-
tion, 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 inter-
mittent or continuous low temperature water returns may
be encountered.
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
When ordering, please specify:
1. Boiler size
2. Supply and return tempera-
tures 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
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 maxi-
mum of 285° F operating and 300° F
design temperature and 250 psi.
Bryan AB Series Boilers Standard and Optional Equipment
STANDARD EQUIPMENT FURNISHED
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.
Water
Boiler
Steam
Boiler