Chapter 2 — Burner Operation and Control
Part No. 750-184 2-11
7. Terminal Block
8. Fuel Oil Strainer (Not Shown): Prevents foreign matter from
entering the burner system.
9. Gas Pilot: See Section D of Chapter 2 for description of the
various components.
10.Light Oil Pilot Valve (Not Shown): When a light oil pilot is
furnished, a solenoid valve is provided to control flow of fuel to
the pilot nozzle. It is energized through programmer contacts. It
is deenergized to shut off pilot fuel flow after main flame is
ignited and established.
11.Back Pressure Orifice: A restriction located in the oil return line
immediately downstream of the fuel oil controller to create back
pressure (100 and 200 series only).`
12.Air Pump Module Assembly (Figure 2-13, 2-14): Provides the
compressed air required to atomize the fuel oil for proper
combustion. The CB-LE air pump module is started
automatically by the programmer’s sequence. It includes
components described A-H.
A. Air Pump Motor: Drives the air pump and an air cooling fan. The
motor is started and stopped simultaneously with the forced draft
fan motor.
B. Air Pump: Provides air for atomization of the fuel oil.
C. Air Filter: The filter cleans the air supply prior to entering air
pump.
D. Check Valve: Prevents lubricating oil and compressed air from
surging back through the pump and air filter when the pump
stops.
E. Air-Oil Receiver Tank: Holds a supply of oil for lubricating the air
pump. The receiver tank also separates lube oil from the
atomizing air before delivery to nozzle.
F. Lube Oil Level Sight Glass: Indicates the level of lubricating oil in
the air-oil receiver tank.
Figure 2-13 Belt Driven Air Pump
(Model CB-OS)
AIR PUMP
DRIVE BELT
HOUSING
AIR
-
OIL
LUBE OIL LEVEL
SIGHT GLASS
TANK
RECEIVER
AIR FILTER
AIR INTAKE
CONTROL VALVE
A
B
C
D
E
F
H
A. AIR PUMP MOTOR
B
. AIR PUMP
C
. AIR FILTER
D
. CHECK VALVE
E
. AIR-OIL RECEIVER TANK
F. LUBE OIL LEVEL SIGHT GLASS
G
. LUBE OIL COOLING COIL
G
Figure 2-14 Air Pump, CB-LE
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