Burner Operation and Control
2-10
750-211 (revised 2009)
Promethean Boilers, Model 4WI Manual
FIGURE 2-10. Air Pump (Primary Air)
12. Air Pump Module Assembly Provides the compressed air required to atomize the fuel oil for proper combustion.
It is started automatically by the programmer’s sequence. It includes components:
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 the 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
the nozzle.
F. Lube Oil Level Sight Glass: Indicates the level of lubricating oil in the air-oil
receiver tank.
G. Lube Oil Cooling Coil: Cools the lubricating oil before it enters the air pump.
A fan driven by the air pump motor circulates cooling air over the coil.
H. Lube OIl Fill Pipe and Strainer: Used when adding oil to the air-oil receiver
tank.
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