Quote:
Originally Posted by parsonsj
Of a greater concern is that the ECM has no way to turn off the compressor. That's a function of the trinary switch -- which only passes on the compressor on request as long as the high side pressure is under 260 psi.
So another question would be: can the E67 be made to take in the compressor request from the dash switch, and only signal the compressor clutch to engage if the pressures are safe? And to withdraw that request if the pressures exceed a programmable threshold (say 325 psi)?
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E67 can and does control compressor - in factory installations. Issue is it gets AC request from HVAC module over CAN bus. And I don't see anyone that is going to solve that puzzle anytime soon.
Best solution is to allow Vintage Air (or whatever) unit control compressor, and ECM control fans. Again, you can set fan DC based on AC pressure (which is why you need to install sensor in AC line and wire to ECM).