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Outdoor furnace. The IBC assembly receives continuous
electrical power (interrupted only by a high limit safety
thermostat) and, through the use of a mounted thermistor
type temperature sensor, the controller assembly monitors
the furnace water temperature. When the water temperature
falls to less than or equal to the setting of the IBC assembly’s
low limit control, the furnace is fired. When the water
temperature rises to greater than or equal to the setting of
the IBC’s high limit control, the furnace is idled.
IBC-3.1 Components
The IBC hardware consists of four functional circuit
sections. These functional circuit sections are the following:
The Low Voltage Power and I/O Circuit Section, The Micro
controller and Communication Circuit Section, The Analog
Input and Signal Conditioning Circuit Section, The High
Voltage Power, and Output Circuit Section.
IBC-3.1 Low Voltage Power and Input Circuit
Section
Low voltage power for the IBC assembly is provided by an
off-line, dual output, positive voltage regulated switching
power supply.
IBC-3.1 5VDC
The +5 VDC is used to power the Micro controller and
Communication circuit section and the Analog Input and
Signal Conditioning circuit section.
IBC-3.1 12 VDC
The +12 VDC is used to power the Low Voltage I/O circuitry
in the Low Voltage Power and I/O circuit section, and for
driving the relay coils in the High Voltage Power and
Output circuit section.