Lanair MXB360 - Manual (Page 25)

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Section 14 - Controls
Burner Controls and Operation
• Oil Primary Safety Control/Cad Cell:
The oil primary control is mounted on top of the burner’s electrical box. When the thermostat calls for heat the oil
primary control starts the burner by switching on the air solenoid valve, ignition transformer, combustion air blower,
and the fuel pump. The oil primary control works in conjunction with the cadmium sulfide cell (cad cell). The cad cell
is mounted inside the burner cover, and faces the flame. The cad cell monitors the light level inside the combustion
chamber to insure there is a flame present. If there is a loss of flame the primary control will go into its recycle
mode. After 1-2 minutes the primary control will restart the burner. When this happens if there is a flame present,
the burner will continue to function. If on start up no flame is established in 30 seconds the primary control will lock
out. CAUTION: Do not press the reset button more than twice. If the burner fails to start refer to Section 19, Trouble
Shooting.
• Barometric Draft Control:
The Barometric Draft Control automatically maintains a pre-set chimney draft, and is located in the chimney connec-
tor (see page 10, Fig. 3). NOTE: The draft must be set/checked using a manometer.
• Air Filter/Regulator:
The Air Filter/Regulator performs two functions: 1. It removes condensation and dirt from the air. 2. It controls the
amount of air pressure reaching the nozzle and air operated fuel valve. The Air/Filter Regulator is mounted on the
cabinet near the burner.
• 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 electri-
cal box.
• Air Operated Fuel Valve:
The Air Operated Fuel Valve controls fuel flow to the nozzle. When the Electric Air Solenoid Valve opens and air pres-
sure 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.
• Air/Oil Pre-heater:
The Air/Oil pre-heater is an assembly that preheats the atomizing air and fuel to a predetermined temperature to
properly combust used oil. The Air/Oil pre-heater is located in the burner.
• Snap Disc Assembly:
The Snap Disc accurately controls the temperature of the air/oil pre-heater assembly with two resistance type car-
tridge-heating elements. The Snap Disc is mounted on the oil pre-heater inside the burner.
• Nozzle:
The Nozzle uses air pressure to help pull fuel through its small orifice, and to atomize the fuel for proper combus-
tion. 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/used oil.
Fuel Pump Controls and Operation
• Fuel Supply Pump:
The Fuel Supply Pump pumps fuel from your oil storage tank to the burner. The Fuel Supply Pump should be locat-
ed as close to the fuel supply tank as possible. The Fuel Supply Pump must be mounted horizontally (Shaft). See
page 12, Fig. 4.