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Cleaver-Brooks' CB780 microprocessor-based control uses state-of-the-art
technology to ensure safe, efficient boiler operation.
Increase Your Boiler IQ
It's the smart way to optimize your boiler!
The flame safeguard control is the "brain" of your boiler. If you're still
relying on an electro-mechanical control, you may not be getting the most from
your boiler. When it's time to upgrade, turn to the people who know your boiler
best - your Cleaver-Brooks Representative. Our CB780 microprocessor-based
control uses the latest technology to help your boiler running smoothly. You
can rest easy knowing this intelligent control is managing your boiler's
operation - safely and efficiently.
Features and Benefits
Dynamic self-check logic and diagnostics:
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Dynamic self-check safety circuit checks microprocessor and safety relay to
ensure safe and proper operation
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Dynamic input check verifies controls ability to recognize the true status of
external controls, limits and interlocks
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Closed-loop logic test verifies integrity of safety critical loads (ignition,
pilot, and main fuel valves) for proper operation
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Pre-ignition interlocks (fuel valve proof-of-closure) and flame signal checked
during Standby and Pre-Purge
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High and Low fire switches checked for proper sequencing
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Tamper-proof Purge Timer Card
Powerful Display/Diagnostic Capabilities:
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2 line x 20 character Vacuum Fluorescent Display is easy to read under all
lighting conditions
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Status and diagnostic messages displayed in English Language with no scrolling
necessary (Spanish also available)
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Displays flame signal in Volts dc, eliminating need for separate meter
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Displays burner hours and numbers of cycles
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Diagnostic displays include on/off status of inputs and outputs, RUN/TEST
switch status, selected purge time, amplifier type and configuration data
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Fault history (retained in non-volatile memory) displays the cycle, hours,
code, description, and condition for the last six fault occurrences
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Capability to mount display on front of Control Panel for improved access, or
remotely, in separate control room. (Optional)
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5 LEDs on base provide at-a-glance status of Power On, Pilot, Flame, Main
Valves, and Alarm conditions (Power LED blinks periodically to indicate proper
control operation)
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Diagnostic display capabilities are further enhanced by the optional CB783
Expanded Annunciator which provides 36 additional specific HOLD and Fault
messages, as well as 26 LEDs to indicate current status or first-out alarm
indication (user-selectable)
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Communication capabilities to a local or remote Personal Computer, with
optional CB-LINK communications module and Combustion System Manager software
(runs under Microsoft Windows®)
Application Flexibility:
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Purge Timing Cards available in 30, 60, 90 seconds or 2-1/2 minutes cover a
wide range of applications, while eliminating need for a separate purge timer
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Separate output for ignition transformer simplifies applications requiring
early spark termination
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Selectable configuration jumpers allow application-specific configuration
Simplified Servicing:
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Diagnostic and fault history information available through display that
simplifies troubleshooting procedures
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Removable access covers for checking voltage at terminals
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5-function RUN/TEST switch eases start-up procedure
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Flame signal display facilitates pilot/light-off test procedures
Product Offering
Included in each CB780 system is the following:
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One CB780 chassis, including display module
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One Purge Timer Card
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One wiring sub-base
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One flame scanner, either Infrared, Ultra-Violet, or UV Self-Check
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One flame amplifier, to correspond with the selected flame scanner
Included with the optional CB783 Expanded Annunciator is:
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One CB783 Annunciator
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One wiring sub-base
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All limits and interlocks are wired into wiring sub-base to provide individual
hold/fault indication on LEDs of Expanded Annunciator, as well as on display
module of CB 780 control
Engineering Data
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Supply voltage: 120 Vac (+10%/-15%) 50 or 60 Hz
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Maximum total load: 2000 VA
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Load rating-fuel valve output: 65 VA pilot duty plus 1150 VA inrush, 460 VA
opening, 250 VA holding
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Operating temperature limits: -40 to 140 °F
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Maximum ambient humidity: 85% non-condensing
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