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IBC-3.1 Microcontroller and Communication
Circuit Detail
The Microcontroller and Communication Circuit Section
features a Microchip Technology microcontroller, RS-232
serial communications circuitry along with a proprietary
communications port, a microcontroller programming port,
an operating mode selection jumper, a multi-pin expansion
port, and several LED indicators.
ClearStak factory programmed firmware that resides in the
micro controller’s non-volatile memory provides the
functional capability for the IBC assembly.
IBC Analog Input and Signal Conditioning
Circuit Section
The Analog Input and Signal Conditioning Circuit Section
consists of the amplifiers that amplify the signals from the
three analog temperature sensors and the oxygen sensor.
Also incorporated into this circuit section is the high limit
water temperature control potentiometer and the low limit
water temperature control potentiometer.
High Voltage Power and Output Circuit
Section
The high voltage power and output circuitry accepts 120 VAC
input power and distributes it to the various consumers of
this input power. This circuit section consists of the power I/O
terminal block, four load control relays and the low voltage
driver circuits for the relays as well as LED indicators that
illuminate when their respective load control relay coils are
energized.
Firmware
This is done by your manufacturer. Do not swap this
controller to another furnace to ensure that the settings are