Form No. 3710
(Rev. 6/04)
Bryan “Flexible Water Tube”
DR Series
Steam & Water Boilers
250,000 to 850,000 BTUH
Forced Draft Gas, Oil or Dual Fuel Fired
Water Boiler
DR850-W-FDGO
Steam Boiler
DR350-S150-FDG
Originators of the “Flexible Water Tube” design
Guaranteed high efficiency performance and
easy maintenance insure low cost operation
All Bryan DR Series boilers offer these operating and performance features
Guaranteedefficiency
DR Series boiler occupies very little space in the boiler
room. This can result in considerable savings in building
costs.Pressurizedfiringpermitsminimumsizedbreach-
ing and vent.
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.
Multi-pass flue gas travel
The Bryan Flexible Tube
High velocity four-pass flue gas travel is obtained by a
uniquebafflingsystem.Thiscontributestomaximumfire
side heat transfer and overall high boiler efficiencies.
Bryan’s exclusive “Flexible Tube” design
eliminates the possibility of damage
from so-called “thermal
shock.”Tubesareeasilyre-
movable and replaceable,
without welding or rolling,
eliminatinglong,expensive
downtime should repairs
ever be required.
Thermal blend water return
Bryan’s unique “thermal blend” return blends cold or
cooler return water with warmer boiler water abridging it
todesignoperatingtemperatures.Aninjectortubedirects
the “mixed” water flow through the downcomer to the
lowerheaderandheatingsurfacesatatemperatureabove
possiblecondensingconditions.Thisreducesthepossi-
bilityof“coldspots”anddamagefromcorrosiveconden-
sation.
Water cooled furnace
Theconfigurationofthewa-
Water
Boiler
Steam
Boiler
ter tubes provides a water
Positiveinternal
circulation
cooled combustion cham-
ber. A high percentage of
the heating surface is exposed to direct radiant heat,
increasingwatervelocitiesandheattransfer.
Each pass of the Bryan
water tube slopes up-
ward.Thisconfiguration,
Large steam drum
along with the large vol-
ume down-comer water
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.
legs, provides the ex-
tremelyrapidnaturalther-
malinternalcirculation,pro-
motingbothhighefficiency
Accessibility of furnace and tube area
ofheattransferanduniform
Innerpanelprovideseasyandcompleteaccesstofurnace
andboilertubearea, aswellastoburnerhead. Allpanels
areheavilyinsulatedandsealedtoboilerframe.Allaccess
is from only one side.
temperature throughout the
boiler. Eliminating stress damage
causedbyunequaltemperaturedistribu-
tion is especially important for heating systems, particu-
larly where intermittent or continuous low temperature
waterreturnsmaybeencountered.
Compact design, minimum floor space
Withourcompactwatertubedesign,theoverallsizeofthe
unitislessthanmostothertypesofboilers.Needingonly
24"fortuberemoval,andononlyonesideoftheboiler,the
Hotwaterboiler
Bryan DR Series Boilers Standard and Optional Equipment
OptionalconstructiontoASMEPower
BoilerCoderequirementsfortempera-
turesexceeding240°Fand/orpressure
exceeding160psitomaximumof285°
Foperatingand300°F designtempera-
ture and 250 psi.
STANDARD EQUIPMENT FURNISHED
OPTIONAL EQUIPMENT,
EXTRA COST
Waterboiler
switch, control panel, all controls in-
stalledandwired.
Combinationthermometerandaltitude
gauge, ASME Code rated boiler relief
valve,watertemperaturecontrol(240°F
max std.), high limit control, probe
LWCO.
1. Manual reset high limit control
2. Manual reset low water cutoff
3. Auxiliary low water cutoff
4. Combinationlowwatercutoff
andfeeder
Straight oil fired unit
Electroniccombustionsafetycontrol,
dualoilvalvesoilignitiontransformer,
two-stagefuelunit,directsparkignition
of oil, oil nozzle assembly, control
panel,allcontrolsinstalledandwired.
Whenordering,pleasespecify:
1. Boilersize
2. Supplyandreturntempera-
turesrequired
5. Alarm bells or horns
Steamboiler
6. CSD-1, FM, IRI or other insur-
anceapprovedcontrolsystems
7. Indicatinglights, asdesired
8. Lead-lag systems for two or
moreboilerswithorwithout
outdoorresetcontrol
Steam pressure gauge, steam pres-
sure control, combination low water
cutoffandpumpcontrol,auxiliarylow
water cutoff, high limit pressure con-
trol, ASME-rated safety valve, water
glass set.
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,
specificgravityandpressure
available
Combination gas-oil unit
Electroniccombustionsafetycontrol,
automaticoperatinggasvalve,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,
dualoilvalves,gaspilotforbothfuels,
two-stagefuelunit, nozzleassembly,
controlpanel,allcontrolsinstalledand
wired.
9. Draftcontrolsystem
Straight gas fired unit
6. Electricpowervoltage, phase
andfrequency
OPTIONAL CONSTRUCTION:
Electroniccombustionsafetycontrol,
automaticoperatinggasvalve,safety
gas valve, pilot solenoid valve, pilot
ignition assembly, main manual gas
shut-off valve, pilot cock, pilot and
maingaspressureregulators,airsafety
Steamboiler
7. Optionalextraequipmentor
construction
OptionalconstructiontoASMEPower
BoilerCoderequirementsforpressure
exceeding150psitomaximumof300
psidesignpressure.
8. Specialapprovalsrequired
(UL, CSD-1, FM, or IRI)
9. Altitude
Bryan DR Series Steam & Hot Water Boilers
FRONT VIEW
REAR VIEW
PLAN VIEW
FT SIDE VIEW
LE
STEAM BOILER DIMENSIONS in inches (cm)
A
B
C
D
E
F
G
H
I
J
K
L
Boiler
Model
Floor to
Flow
Width
Outside
Jacket
Length Height
of Over
Gas Train
Connection
(Approx.)
Supply Nozzle
Min. Tube
Removal
Clearance
24
(60.96)
Clearance
for Servicing
Burner
Overall
Length
Return
Conn.
Flue
Size
Flue
Location
Number
15 psi 150 psi
Nozzle
Jacket Jacket
62 1/8
74 5/8
33 13/16
32 3/8
71 3/4
1
3
NA**
2
6
12 13/16
30
(76.20)
DR250-S*
DR350-S
DR450-S
DR650-S
DR850-S
(157.80) (189.54)
(85.88)
(82.23) (182.25)
(2.54)
(7.62)
(5.08)
(15.24)
(32.54)
62 1/8
74 5/8
33 13/16
32 3/8
71 3/4
1
3
3
2
6
12 13/16
24
(60.96)
30
(76.20)
(157.80) (189.54)
(85.88)
(82.23) (182.25)
(2.54)
(7.62)
(7.62)
(5.08)
(15.24)
(32.54)
62 1/8
74 5/8
33 13/16
32 3/8
71 3/4
1
3
3
2
6
12 13/16
24
(60.96)
24
(60.96)
24
(60.96)
30
(76.20)
30
(76.20)
30
(76.20)
(157.80) (189.54)
(85.88)
(82.23) (182.25)
(2.54)
(7.62)
(7.62)
(5.08)
(15.24)
(32.54)
73 1/2
74 5/8
33 13/16
43 3/4
71 3/4
1
4
4
2
8
12 13/16
(186.69) (189.54)
(85.88)
(111.13) (182.25)
(2.54)
(10.16)
(10.16)
(5.08)
(20.32)
(32.54)
73 1/2
74 5/8
33 13/16
43 3/4
71 3/4
1
4
4
2
8
12 13/16
(186.69) (189.54)
(85.88)
(111.13) (182.25)
(2.54)
(10.16)
(10.16)
(5.08)
(20.32)
(32.54)
NOTE: Dimensions subject to change without notice. Consult factory for certified dimensions.
* Not intended for use as a principal heating source for the living space of an individual residence.
** Not available in 15 psi construction.
FRONT VIEW
PLAN VIEW
LEFT SIDE VIEW
REAR VIEW
WATER BOILER DIMENSIONS in inches (cm)
A
B
C
D
E
F
G
H
I
J
K
L
Boiler
Model
Floor to
Flow
Width
Outside
Jacket
Length
of
Height
Over
Min. Tube
Removal
Clearance for
Servicing
Burner
Overall
Length
Gas Train
Connection
Supply
Nozzle
Return
Nozzle
Flue
Size
Flue
Location
Number
Nozzle
Jacket
Jacket
Clearance
62 1/8
67 7/8
32 1/8
32 3/8
66 3/8
1
2
2
6
1213/16
24
(60.96)
30
(76.20)
DR350-W
DR450-W
DR650-W
DR850-W
(157.80)
(172.40)
(81.60)
(82.23)
(168.59)
(2.54)
(5.08)
(5.08)
(15.24)
(32.54)
62 1/8
67 7/8
32 1/8
32 3/8
66 3/8
1
2
2
6
1213/16
24
(60.96)
24
(60.96)
24
(60.96)
30
(76.20)
30
(76.20)
30
(76.20)
(157.80)
(172.40)
(81.60)
(82.23)
(168.59)
(2.54)
(5.08)
(5.08)
(15.24)
(32.54)
73 1/2
67 7/8
32 1/8
43 3/4
66 3/8
1
2
2
8
1213/16
(186.69)
(172.40)
(81.60)
(111.13)
(168.59)
(2.54)
(5.08)
(5.08)
(20.32)
(32.54)
73 1/2
67 7/8
32 1/8
43 3/4
66 3/8
1
2
2
8
1213/16
(186.69)
(172.40)
(81.60)
(111.13)
(168.59)
(2.54)
(5.08)
(5.08)
(20.32)
(32.54)
Specifications subject to change without notice. Consult factory to consult on other boiler options.
Bryan Steam LLC — Leaders Since 1916
783 N. Chili Ave., Peru, Indiana 46970 U.S.A.
Phone:765-473-6651
•
Fax: 765-473-3074
•
Form No. 3710
©2004 Bryan Steam LLC
Printed in USA
64-6166
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