SM14-001-0
Page 5
DESCRIPTION
The heater is a thermostatically controlled, internal
seat valve. A fuel needle (factory adjusted to burn
combustion heater with diesel fuel oil used as the
DF-2 efficientIy) regulates the amount of fuel si-
fuel.
phoned by the air/fuel mixing nozzle. DF-1, DF-2.
and DFA will burn in the heater, as required by am-
Air for heat circulation and for combustion is pro-
bient temperature.
vided by a 24-volt motor-blower assembly. Spark for
combustion is supplied by a 24-volt ignition system
The carburetor body is also provided with a fuel
which consists of a solid state ignition pack and an
heater which is energized through the carburetor
thermostat. The fuel heater facilitates fuel flow while
starting at low ambient temperatures. A glow plug
Combustion air is supplied by a two-stage combus-
controlled by the flame switch and a relay is used to
tion air blower, and fuel flow to the burner head is
preheat the burner head to aid ignition. This is ac-
controlled by a carburetor. Fuel flow to the carburetor
complished with a spark-plug-like igniter.
bowl is controlled by a float-actuated needle-and-
TABLE OF SPECIFICATIONS
Heater case dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 in. long x 11 in. wide x 6 3/4-in. high
Weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 lbs.
Shipping weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 lbs.
Rating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20,000 BTU
Heater air outlet diameter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 in.
Exhaust outlet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 in. dia. standard steel pipe
Combustion air inlet. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 in. OD tube
Fuel connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1/8-in. NPT female fitting
Electrical requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 volts
Current draw
Starting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 amps
Run. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 amps (average)
Blower only. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 to 4 amps
Fuel requirement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . No. 1 or No. 2 diesel fuel or arctic diesel fuel
Fuel supply pressure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 to 5 psi
Fuel consumption. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1/4 hours/gallon on high thermostat setting
Burner. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Low pressure atomizing type
Ignition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Solid state ignition pack (8000 volts)
Heater is factory-adjusted to burn No. 2 diesel fuel. If No. 1 fuel or arctic diesel is used, readjust carburetor
as directed under CARBURETOR ASSEMBLY. Proper fuel adjustment is the key to dependable operation
with minimal service requirements.
THEORY OF OPERATION
GENERAL.
Do not operate the heater with the
Do not operate the heater at less than
covers off.
21 volts.
