General Description
1-6
750-96 (revised 2010)
Model CB Packaged Boiler Manual
13. Flame Detector Monitors gas or oil pilot and energizes the programmer’s flame relay in response to a
flame signal. It continues to monitor main flame (oil or gas) after expiration of pilot pro-
viding period. A standard equipped boiler has a lead sulfide (infrared sensitive) detector.
14. Combustion Air
Proving Switch
A pressure sensitive switch actuated by air pressure from the forced draft fan. Its contacts
close to prove presence of combustion air. The fuel valves cannot be energized unless this
switch is satisfied.
15. Alarm Sounds to notify the operator of a condition requiring attention. The alarm is available as
optional equipment.
16. Stack Thermometer Indicates temperature of vented flue gases.
17. Diffuser This is a circular plate located at the furnace end of the burner drawer to impart a rotary
swirling motion to combustion air immediately prior to its entering the flame, thus provid-
ing a thorough and efficient mixture with the fuel.
18. Rotary Air Damper This damper provides accurate control of combustion air in proportion to fuel input for
various load demands. It consists of two concentric cylinders with openings. The outer is
stationary. The inner is rotated, under control of the modulating motor, to vary the effec-
tive size of the openings where they overlap.
Control Description
Courtesy of: C3 Surplus LLC
Surplus Industrial Superstore
305-428-2777
https://www.c3surplus.com
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