750-271
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DESCRIPTION
The Cleaver-Brooks CB120Z expands on the standard CB120 (see manual 750-264) by combining
boiler control functions with the same burner management control found in the CB120. The result is
a single compact package that can directly control the boiler's output firing rate based on either input
pressure or temperature or both. The CB120Z System is designed to provide the proper burner
sequencing, ignition and flame monitoring protection on automatically ignited oil, gas, and combina-
tion fuel burners. Through the display, the operator programs the desired setpoint, cut in, cut out and
modulating range and with PID control, the CB120Z System controls the burner/boiler from start up
through shutdown, precisely maintaining the desired setpoint. The CB120Z System continuously
monitors interlocks and limits found in the L1-3 and 3-P circuits as it programs the burner/blower
motor, ignition and fuel valves to provide for proper and safe burner operation. VFD and LCD dis-
plays are available that may be either plugged in or mounted remotely to give full language descrip-
tors of current status and diagnostic lockout information as well as provide a user friendly menu
system to make setting the boiler parameters easy and understandable. Through SMART LED'S,
located on the front cover or through the display interface, the control provides current operating sta-
tus and lockout information in the event of a safety shutdown. Following are some of the major con-
trol and monitor capabilities provided by the CB120Z System:
•
Operating Control Function
for automatic sequencing of the boiler system to start and stop the
boiler to meet system demand.
•
Full Modulation Control
of fuel and combustion air through the firing rate motor to meet sys-
tem demand.
•
Solid State Sensors
to monitor steam pressure, water temperature, stack temperature, boiler
water temperature, or outdoor air temperature.
•
High Pressure and Temperature Alarm Limits
based on inputs from solid state sensors.
Exceeded limits will open interlock circuit to the flame safeguard control for shutdown of the
burner and boiler.
•
Cold Start Thermal Shock Protection
to slowly increase the burner firing rate on a cold start
to limit mechanical stress due to thermal differences.
•
Multiple Lead/Lag
operation of two or more boilers.
•
User-friendly keypad display system
in either VFD or LCD format featuring the all-info dis-
play mode, program and review of system setpoints and operating parameters.
•
Remote Communication Capability
allows reading and writing of all setpoint information.
•
Password Protected Parameters
(two levels of security) to restrict unauthorized entry and
modification of system setpoints and operating parameters.
CB120Z
MICROPROCESSOR-BASED
BURNER MANAGEMENT CONTROL
WITH INTEGRATED BOILER
CONTROL OPERATION
APPROVED
Содержание CB120Z
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