Model 4
1500 - 6000 MBTU/hr
Rev. 03-08
Section B2-5
Table B2-1. Model 4 Boiler Sizes
MODEL
NO.
INPUT
MBH
HEAT
OUTPUT
MBH
EQUIV
HP
STEAM
OUTPUT
LB/HR
SHIPPING
WEIGHT
LBS
1500
1500
1200
35
1237
3100
2000
2000
1600
47
1649
3100
2500
2500
2000
59
2062
3700
3000
3000
2400
71
2474
3700
3500
3500
2800
83
2887
4100
4000
4000
3200
95
3299
4100
4500
4500
3600
107
3711
4700
5000
5000
4000
119
4124
4700
6000
6000
4800
143
4949
5400
NOTE: Steam output from and at 212 °F.
J. Factory painted using hard-finish enamel.
2. Forced Draft Burner
A. The burner is a high radiant multi-port type approved for operation on natural gas
and a pressure atomizing type approved for operation with commercial grade No. 2
fuel oil.
B. Consisting of the fan which is direct connected to the fan motor, wind box, air
damper that is linkage connected to a damper drive motor, the complete assembly is
factory mounted and tested.
C. To ensure proper air for pre purge and combustion is provided by the fan, a
combustion air proving switch is provided.
D. The complete burner/wind box swings open via a davit arm attached to the upper
drum. This permits fireside inspection of the furnace and burner internals.
E. Responding to steam demand from the drum mounted pressure control, the burner
operates in the low-high-low-off firing mode. Ultra-violet (UV) flame scanner is
provided for flame presence during firing.
F. An Ignition transformer is provided.
G. Ignition is direct spark on straight oil fired burners, and gas pilot on straight gas or
combination gas/oil burners.
H. Oil Train consists of the following:
• 4
Solenoid Shutoff Valves providing low fire, intermediate transitional firing from low
to high and high fire.
• An
oil
pump
is
mounted (belt driven from the fan motor) for pressure atomization of
the fuel oil.
• Oil
Pressure Gauge.
•
Suction and return tubing connected to an oil connection block.
