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Check outlets to insure proper wire polarity. A simple plug-in
connector can be obtained to insure that the cable between
the furnace and the breaker box are wired properly. A
reversed line and neutral wire will cause a controller relay
failure and will permanently damage the IBC.
Ground Test
Check the ground connection for any voltage between the
ground rod and the furnace. The NEC and UL require a
ground rod to be at least 8 feet in length. Two pieced rods
are the easiest to install. The ground rod at the furnace
should be a copper-bonded, galvanized, or stainless steel
rod. The low voltage sensors and the GFI are very
sensitive to poorly grounded or stray voltage conditions.
The IBC terminal block uses a common ground. Power
entering the IBC through a ground can permanently
damage the controller.
Failure to insure a proper
ground connection will void your warranty.
Thermocouple Visual Test
The most common error in the installation of the IBC is the
reversal of the yellow (positive) and red (negative) wires in
the thermocouple plug. Red as the negative wire is the
low voltage standard for thermocouples and is opposite
the automotive wiring convention. A reversal of these two
wires will cause the sensor output of the temperature to be
negative. This will cause the pre-heater to remain on and
unable to reach activation temperature. This condition will
lead to an excessive lockout condition.
Thermistor Test
Using an ohm meter, check the amount of resistance from
the thermistor at the IBC terminal block. The thermistor
has a reference resistance of 30,000 ohms at 77°F (25°C).
Check periodically to make sure the thermistor is installed
correctly in thermowell. Failure to do so could result in
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