Guaranteed efficiency
Thebreakthroughinwatertubeboilerdesignthatproduced 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 | Steam |
circulation | Boiler |
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- tremelyrapidnaturalther- malinternalcirculation,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.
Water boiler
Combinationthermometerandaltitude gauge, ASME Code rated boiler relief valve,watertemperaturecontrol(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 maingaspressureregulators,airsafety
switch, control panel, all controls in- stalled and wired.
Straight oil fired unit
Electronic combustion safety control, dual oil valves oil ignition transformer, two-stagefuelunit,directsparkignition 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 maingaspressureregulators,airsafety 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.
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:
Steam boiler
Optional construction to ASME Power Boiler Code requirements for pressure exceeding 150 psi to maximum of 300 psi design pressure.
turesexceeding240°Fand/orpressure exceeding 160 psi to maximum of 285° Foperatingand300°F designtempera- ture and 250 psi.
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
easy maintenance insure low cost operation 
