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Control Module HVAC: Description and Operation
A/C Control Assembly

The microprocessor is essentially the entire central processing unit (CPU) of the computer on a single chip. The decision making logic (instructions) is
stored in a small read-only-memory (ROM) on the largest of the three printed circuit boards that comprise the A/C control head assembly. 

Relays and Modules > Relays and Modules - HVAC > Control Module HVAC > Component Information > Description and Operation > A/C Control Assembly

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