Section 9 - Controls
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• Electric Air Solenoid Valve
The Electric Air Solenoid Valve is controlled by the Oil Primary Control. It acts as a shut-off
valve, (it’s open during operation, and closed when the burner is off ). The Electric Air
Solenoid Valve is located inside of the burner’s electrical box. (See Page 51).
• Air Operated Fuel Valve
The Air Operated Fuel Valve controls fuel flow out the nozzle. When the Electric Air
Solenoid Valve opens and air pressure pushes on the fuel valve diaphragm, the plunger
moves off the nozzle seat allowing fuel to enter the nozzle. The Air Operated Fuel Valve is
located on the back of the air pre-heater. (See Page 51).
• Air/Oil pre-heater
The Air/Oil pre-heater is an assembly that preheats the atomizing air and fuel to a prede-
termined temperature to properly combust used oil. The Air/Oil pre-heater is located in the
burner (See Page 51).
• Snap Disc
The Snap Disc accurately controls the temperature of the air/oil pre-heater assembly with
two resistance type cartridge-heating elements. The Snap Disc is mounted on the oil pre-
heater inside the burner. (See Page 51).
• Nozzle
The Nozzle uses air pressure to help pull fuel through its small orifice, and to atomize the
fuel for proper combustion. The Nozzle is located on the end of the air pre-heater opposite
the fuel valve. Replace the Nozzle annually, as they are prone to wear by contaminants in
waste oil (See Page 46).
• Fuel By-Pass Regulator
The Fuel By-Pass regulator controls the pressure of the fuel to the nozzle. The Fuel By-Pass
regulator is located in the line between the outlet side of the pump and the burner.
• Fuel Supply Pump
The Fuel Supply Pump pumps fuel from your oil storage tank to the burner. The Fuel Supply
Pump should be located as close to the fuel supply tank as possible. The Fuel Supply Pump
must be mounted horizontally (Shaft).
Section 12 - Flame Adjustment
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Flame Adjustment
1.
Start the heater, let it run for at least 15 minutes to reach operating temperature before
proceeding.
2.
Check the chimney draft, set the barometric damper to -.06 WC when hot and running.
3.
Check the atomizing air pressure, set the air filter/regulator on the heater to 15 PSI as a
starting point.
4.
Check the fuel pressure gauge on the burner, set to:
5.
Adjust the thumb screw on the fuel by-pass regulator. Lock into position. The flame
should extend no more than 3/4 of the way into the chamber.
NOTE:
The above pressure is a staring point, depending on your installation you may
need further adjustment. Always
VISUALLY SET THE FLAME
. See page 30.
6.
Loosen the combustion air adjustment
baffle, slowly close the baffle in 1/16”
increments until the heater (flame) starts
to rumble. Then slowly open the baffle in
1/16” increments until the rumbling stops,
(wait 2 minutes between adjustments)
finally open the baffle an additional 1/8”
to provide excess oxygen. Secure the baf-
fle, (See Fig. 10).
NOTE:
Mechanical equipment like gauges
and regulators are not always 100 percent
accurate,
VISUAL INSPECTION OF THE
FLAME IS REQUIRED
in order to properly
dial in the flame settings, see page 30.
Model DHI-300
No. 1 and No. 2 Fuel Oil
4.5 (4-1/2) LBS.
Used Crankcase Oil 10W-50W
5-6 LBS.
Used Automatic Transmission Fluid
5-6 LBS.
combustion
air baffle
The combustion air baffle is NOT
factory set
!
Figure 10
