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With that static pressure it should engage, provided the trinary switch is in position-3. The connector is a bit exposed, so does suffer corrosion.
It also depends if you have an early direct HEVAC feed, or the later relay version. Early HEVAC checks for compressor current, and will not engage if it's too low.
It also depends if you have an early direct HEVAC feed, or the later relay version. Early HEVAC checks for compressor current, and will not engage if it's too low.