(1)
(2)*
(3)(5)*
MINIMUM
A.
BOILER
I=B=R
D.O.E.
I=B=R NET
NATURAL
PUMP
NOZZLE
F.
MODEL
OIL BURNER
HEATING
RATINGS
DRAFT
PRESSURE FURNISHED
U.
NUMBER
INPUT
CAPACITY
WATER
CHIMNEY SIZE
E.
G.P.H. MBH
MBH*
MBH
ROUND SQUARE
PSI
140 PSIG*
RATING
OBC3D
.77
107
93
75
6
8x8x15
140
.65x80B
86.0
OBC3
1.00
140
118
103
6
8x8x15
140
.85 80B
80.0
OBC4D
1.00
140
120
104
6
8x8x15
140
.85x80B
86.0
OBC4
1.40
196
165
143
6
8x8x15
140
1.25 80B
81.0
RATINGS, DATA, AND DIMENSIONS
STANDARD EQUIPMENT: Crated Boiler, Flush Jacket, Oil Burner, Target Wall/Liner, Circulator-1.1/4", ASME
Relief Valve, Theralitimeter Gauge, Drain Cock, Wiring Harness, Burner Electrical Disconnect, Plastic Cover,
Supply Tapping-2", Return Tapping-1.1/2", High Limit and Circulator Control, Primary Control. For Tankless
Heater Units-add Tanlkess Hot Water Coil, Flow Restrictor and Triple Aquastat Relay.
TANKLESS WATER HEATER CAPACITIES
DIMENSIONS
Part Number : 2761401
Rev. 8 , July 2003
A
B
C
BOILER
LENGTH OF
FRONT OF CASTING
DIA. OF
NO.
FLUSH
TO CENTER LINE OF
FLUE OUTLET
JACKET
FLUE OUTLET
OBC3
19"
9.3/4"
6"
OBC4
23"
11.3/4"
6"
BOILER
FIRING
TANKLESS
TANKLESS
BOILER
MODEL
RATE
HEATER
H EATER CAPACITY
WATER
NUMBER
G.P.H.
NUMBER
INTERMITTENT DRAW
CONTENT
G.P.H.
GALS.
OBC3D
.65
L-24
-
6.7
OBC3
1.0
L-24
3.25
6.7
OBC4D
1.0
L-24
3.25
8.2
OBC4
1.4
L-24
4.00
8.2
NOTES:
1. Add suffix "T" to denote boiler with tankless heater.
2. I=B=R burner capacity is based on an oil heating value of 140,000 Btu/gal. and with 13% CO
2
.
3. Net ratings based on 170
0
F temperature in radiators and include 15% allowance for normal piping and pick
up load. Consult manufacturers for unusual piping and pick-up requirements.
4. Nozzle listed is for use with beckett burner.
5. For equivalent square feet of radiation, divide I=B=R output by 150.
6. MEA number for the OBC series boiler is 47-76E.
7. MEA number for the R.W. Beckett AF burner is 156-77-E.
8. Electrical service to be 120 Volts, 15 Amps, & 60 Hz.
D
TANKLESS COIL TO
BACK
OF JACKET
8.7/8"
12.3/4"
