7 750-265
OVERVIEW
Functions provided by the CB Falcon include automatic boiler
sequencing, flame supervision, system status indication, firing
rate control, load control, CH/DHW control, limit control,
system or self-diagnostics and troubleshooting.
The maximum version of the controller offers:
• NTC-temperature sensor for:
• Outlet Limit And Temperature
• DHW (Domestic Hot Water) Limit and Temperature
• Stack Temperature Limit and Temperature
• Inlet Temperature
• Outdoor Temperature
• Modulating output PWM-driven rotation speed controlled
DC-fan for optimal modulation control.
• Three Pump Outputs with 5 selectable operation modes
• 24Vac or 120Vac (model specific) offer:
• Output control of gas valve (Pilot and Main) and
External Ignition Transformer
• Digital inputs for room limit control, high limit
control, Air pressure switch, Gas pressure switch.
• Optional switches:
• Time of Day switch
• Burner switch
• Easy modification of the parameters on three levels:
• End-user
• Installer / Service engineer
• Manufacturer
• Integrated spark transformer
• Optional external spark transformer
• Optional combined ignition and flame sensing
• Test jacks for flame signal measurement from either a
flame rod or UV flame sensor.
Fig. 1. General hydronic boiler schematic.
Fig. 1 shows two loops of heat control: Central Heating (CH),
and an optional second loop for Domestic Hot Water (DHW)
can be configured on each CB Falcon. The DHW loop transfers
heat from the boiler outlet to hot water appliances in
conjunction with the primary system heat loop. Priority
assignment to each heat loop can be configured to specify
which loop gets serviced first.
COMMUNICATIONS AND DISPLAYS
Three modes of communications are available to the CB Falcon:
• ECOM is used for the S7910 Local Keyboard display for
Falcon monitoring and changing setpoints. Some
equipment setup and checkout is available using the
S7910 along with remote reset of a lockout on the Falcon.
• Local ModBus allows for interfacing to one or all Falcons of
a system and presents them individually to the user. The
833-3577 Operator Interface is a four color touchscreen
display used for configuration and monitoring of the Falcon.
Control Operation and display status in both test
and graphical modes can be shown along with the ability to
setup and displaying trending. The Falcon can also be
remotely reset through the 833-3577 display.
• Global ModBus is a RS485 communications port that
allows configuration and status data to be read and written
to the Falcon. Supports a Master 833-3577 or a Building
Automation master to control the Falcon to respond to a
R7910
HEAT
LOAD
LOCAL
DISPLAY
T
OUTDOOR
TEMP
T
HEADER
TEMP
IGNITOR
FAN
ALARM
STACK
T
T
BOILER
OUTLET
T
T
INLET
FLAME SIGNAL
INTERLOCK(S)
PII
LIMIT(S)
ANNUNCIATION (8)
REMOTE RESET
TOD
STA
T
PILOT
VALVE
MAIN VALVE(S)
DOMESTIC
HOT WATER
TANK
BOILER
MIX
LOOP
DHW
LOOP
M27058
BUILDING
AUTOMATION
SYSTEM
WATER
OUTPUTS
INPUTS
KEY
COMMUNICATION
SYSTEM
DISPLAY
CH
LOOP
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