Micro Autonomations LLC – Fan Controller v3
1
Document Rev 1.0
Fan Controller v3
M
icro
A
utonomations LLC
© 2014
Description
This controller was designed to control C-Class fans from Mercedes. It will work with any standalone
temperature sensor, or it may piggyback on any 5v EFI temperature sensor. Use, described in more
detail later, entails entering programming mode to set the turn on and 75% fan speed temperatures.
The controller will command the fan speed linearly between and above those two temperature set
points.
As a safety feature, if the controller does not detect a temperature sensor, it will turn the fan on; or, if
the active sensor wire gets grounded, it will turn the fan on.
