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Re: pic: a control box
If the heat sink is a completely passive device (ie. it is a big lump of aluminum that is nailed to your compressor) then it is OK. However, if it is an active device with forced cooling (ie. it is a big lump of aluminum that is nailed to your compressor, and it has an electric fan that forces air over the surface of the lump to speed the removal of excess heat), then you may be in trouble. The fans are electrical devices, and are subject to all the restrictions of such devices under the parts use flowchart.
Under the definitions used by FIRST, a fan is an electronic component (ie. it is designed to conduct electricity). Since it did not come in the kit, you have to ask the question "is the part a motor, solenoid, pump, or other actuator?" the answer is "yes" (the fan does contain a motor). According to the flowchart, the fan may not be used.
-dave
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