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furnace to overheat.
Oxygen Sensor Test
Check millivolts from the oxygen (O
2
) sensor to insure
proper operation. The O
2
sensor puts out a milli-volt
signal that will indicate the amount of oxygen available
post combustion. The value for O
2
is close to zero at
ambient atmosphere levels of between 17% and 19%. As
the O
2
levels approach 0%, as a compared to the ambient
air outside the O
2
sensor, values will approach 1000 MV.
IBC-3.1 Low Post-Catalyst Oxygen Level
Feature
In the event that the post-catalyst oxygen is too low, the
effectiveness of the catalyst is compromised and smoke
may result. To handle this condition, the IBC-3.1 will
attempt a patent pending oxygen recovery cycle as defined
by ClearStak. The IBC-3.1 oxygen recovery cycle functions
as follows: If the Earth Outdoor furnace is operating under
a call for heat (CFH) and the IBC is factory configured to
perform an oxygen recover cycle and the oxygen level falls
below a factory programmed level, then the furnace will
engage a variable speed frequency drive (VFD) to power
the back blower adding the needed amount of oxygen. In
the unlikely event that the blower cannot provide the
needed oxygen the front blower will be slowed down to
allow complete combustion. Whenever the post-catalyst
oxygen level is equal to or below the factory programmed
low oxygen level, the Low Oxygen LED will be illuminated.
Integrated Safety Features
There are certain safety features that are integrated into
the IBC assembly’s hardware and firmware.
Upon power-up, the electromechanical reset switch is
checked to be sure that it is not stuck in the actuated position.
Summary of Contents for Klear Sky 400
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