Haltech F9A - Manual (Page 93)

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5.5 Electric Intercooler Fan Control (IF)
This function can be used to switch on an electric fan on the intercooler when the inlet air
temperature exceeds a certain value. The fan will stay on until the temperature drops below a
second value.
NB: The electric fan cannot be driven directly by the ECU. A relay must be used to switch the
high currents drawn by the fan.
To use this function, you must have the following:
- the F9A secondary harness incorporating the Auxiliary I/O connector;
- an electric fan, fused and relay switched;
- F9 programming software and cable.
Install the wiring for the thermofan to one of the Auxiliary outputs. This should be done in the
same way as described in figure 5.5 for the Thermofan. Be sure that the relay contacts are
rated higher than the current drawn by the fan.
Run the F9 programming software and go to the Options page. Select the Intercooler Fan
function on the appropriate output and set the two temperatures as required.
Switch On Temperature: The inlet air temperature that must be exceed to switch the fan on.
Switch Off Temperature: The temperature the inlet air must drop below before the fan will
be switched off. This parameter should be at least 5° lower than the Switch On temperature to
prevent the fan from switching in and out repeatedly.
Figure 5.5. Example circuit for an Intercooler Fan.