General Description
1-14
750-96 (revised 2010)
Model CB Packaged Boiler Manual
1.11 — Controls for Combination Burners Only
16. In addition to the
Fuel Oil Controller com-
ponents mentioned in
Section 1.9
a) Fuel Oil Thermometer: Indicates temperature of fuel oil being supplied to the fuel oil
controller.
b) Back Pressure Valve: For adjustment of the oil pressure on the downstream side of the
metering valve. Also regulates rate of return oil flow.
c) Oil Return Pressure Gauge: Indicates the oil pressure on return side of fuel oil control-
ler.
d) Manual Bypass Valve: Provided as a time saver in establishing oil flow. When open it
permits circulation of oil through the supply and return lines. Prior to initial light off, this
valve must be closed.
e) Orifice Oil Control Valve: Valve may be opened prior to startup to aid in establishing
fuel oil flow through the controller. Prior to initial light off, this valve must be closed. Its
disc has an orifice to permit a continuous circulation of hot fuel oil through the controller.
17. Air Purge Valve Solenoid valve opens simultaneously with closing of oil solenoid valve at burner shut-
down allowing compressed air to purge oil from the burner nozzle and adjacent piping.
This oil is burned by the diminishing flame which continues burning for approximately 4
seconds after oil solenoid valve closes.
18. Air Purge Orifice
Nozzle
Limits purging air to proper quantity for expelling unburned oil at normal delivery rate.
19. Air Purge Orifice
Nozzle Filter
Filters the purging air of any particles which might plug the air purge orifice nozzle.
20. Air Purge Check
Valve
Valve check prevents fuel oil from entering the atomizing air line.
21. Air Purge Relay When energized, controls operation of air purge valve.
NOTE: The fuel oil controller shown in Figure 1-5 is for a No. 5 or 6 oil fired burner. Some of the above items are not
required on burners equipped for No. 4 oil. Oil flow, and its control, for each of the grades of oil is outlined in Section
1.16 of this chapter. Nozzle purge is provided only on No. 5 and 6 oil burners.
Control Description
1. Gas-Oil Switch Burners equipped to burn either oil or gas include equipment for each fuel. The selector
switch routes electrical circuitry through those controls and interlocks required for the
particular fuel. Chapter 4 details the required mechanical functions of each fuel system.
Control Description
Courtesy of: C3 Surplus LLC
Surplus Industrial Superstore
305-428-2777
https://www.c3surplus.com
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