Guaranteed high efficiency performance and
easy maintenance insure low cost operation
All Bryan DR Series boilers offer these operating and performance features
Guaranteed efficiency
The breakthrough in water tube boiler design that produced
the DR Series provides operating efficiency so reliable,
we guarantee it to be 83.5% for hot water boilers and
82.5% (15 psi) or 80% (150 psi) or better for steam boilers.
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 configuration of the wa-
ter tubes provides a water
cooled combustion cham-
ber. 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 floor space
With our compact water tube design, the overall size of the
unit is less than most other types of boilers. Needing only
24" for tube removal, and on only one side of the boiler, the
DR Series boiler occupies very little space in the boiler
room. This can result in considerable savings in building
costs. Pressurized firing permits minimum sized breach-
ing and vent.
Multi-pass flue gas travel
High velocity four-pass flue gas travel is obtained by a
unique baffling system. This contributes to maximum fire
side heat transfer and overall high boiler efficiencies.
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 flow 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 conden-
sation.
Positive internal
circulation
Each pass of the Bryan
water tube slopes up-
ward. This configuration,
along with the large vol-
ume down-comer water
legs, provides the ex-
tremely rapid natural ther-
mal internal circulation, pro-
moting both high efficiency
of heat transfer and uniform
temperature throughout the
boiler. Eliminating stress damage
caused by unequal temperature distribu-
tion is especially important for heating systems, particu-
larly where intermittent 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. CSD-1, FM, IRI or other insur-
ance 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
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,
specific gravity and pressure
available
6. Electric power voltage, phase
and frequency
7. Optional extra equipment or
construction
8. Special approvals required
(UL, 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 tempera-
tures exceeding 240° F and/or pressure
exceeding 160 psi to maximum of 285°
F operating and 300° F design tempera-
ture and 250 psi.
Bryan DR Series Boilers Standard and Optional Equipment
STANDARD EQUIPMENT FURNISHED
Water
Boiler
Steam
Boiler
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 pres-
sure control, combination low water
cutoff and pump control, auxiliary low
water cutoff, high limit pressure con-
trol, ASME-rated safety valve, water
glass set.
Straight gas fired 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 in-
stalled and wired.
Straight oil fired 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.
