750-96 (revised 2010)
Model CB Packaged Boiler Manual
1-3
1.4 — Control and Component Function
The sequence of burner operation from startup through shutdown is governed by the program relay in conjunc-
tion with the operating, limit and interlock devices which are wired into the circuitry to provide safe operation
and protect against incorrect operating techniques.
All “CB” boilers have the burner assembly attached to the front head. The entire head may be swung open for
inspection and maintenance.
Combustion air is provided by a centrifugal blower located in the front head. Combustion air delivery to the
burner is under the control of the damper motor. This same motor regulates the flow of gas fuel through a linkage
system connected to the gas butterfly valve and the flow of oil through a cam operated metering valve. Fuel input
and air are thus properly proportioned for most efficient combustion.
Filtered primary air for atomizing fuel oil is furnished independently of combustion air by an air pump.
The burner control circuit operates on 115 volt, single phase 60 hertz (or 50 hertz when equipped) alternating
current. The forced draft fan motor is generally operated on 3 phase service at the available main power supply
voltage.
Indicator lights signaling load demand, fuel valve, low water, and flame failure conditions are standard equip-
ment.
In addition to the standard basic controls supplied, other devices may be required to meet specific requirements
of an insurance carrier or local code. Refer to the wiring diagram furnished with the burner to determine the spe-
cific controls in the burner and limit control circuits. The function of individual components is outlined in this
chapter and the electrical sequence is covered in Chapter 3.
1.4 — Control and Component Function
The term “control” covers the more important valves and components, including but not limited to electrical con-
trols or those monitored by the program relay. The operator must become familiar with the individual functioning
of all controls whether or not outlined before he can understand the boiler’s operation, and procedures outlined in
the manual.
The actual controls furnished with any given boiler will depend upon the type of fuel for which it is equipped and
whether it is a hot water or steam boiler.
1.5 — Controls Common to All Boilers
Boilers having optionally ordered features may have control components not listed here.
Courtesy of: C3 Surplus LLC
Surplus Industrial Superstore
305-428-2777
https://www.c3surplus.com
To Next Page
Loading...
