RE: Prostar ac

[Chamberpains]

(07-03-2019 )Lonestar10 Wrote:  I would think if you wanted an old style setup with better reliability.

you could probably use the same compressor/condensor/evaps all that stuff but a few custom hoses/lines. granted at the cost a rawze arduino might be cheaper.

but as far as i can think of.

some custom wiring/relays

Put AC system on a toggle switch
On custom lines from/to compressor maybe 2 High pressure cutout switches 1 switch around 300ish PSI turns on fan. 2nd switch 350-400PSI shuts off AC compressor.

A LP Cutout under 10-15lbs cuts out compressor.
and possibly some way to cycle compressor if evap gets to cold. how idk

Lonestar you have pretty much everything right on. The last part your looking for is the thermostatic cutout switch to shut the compressor off when its to cold. One of these worked for decades.

Shove the thermostat lead straight into the fins of the evaporator and wire it in to cut the power to the compressor.

They also make dual sensors (high\low) for controlling the compressor safety cutouts. Freightliner and International used them for decades also. If you want a simple system, just get the wiring diagram for an International 9400 or 9200.

I'll post it if its broken down simple enough on my schematics.

They only hitch in the plan may be getting the fan to kick in without an check engine light. But that can simply be remedied with a 2nd fan solenoid switch plumped in down stream from the OEM fan solenoid. Which can also be used for a manual override toggle switch in the cab if someone wanted to have that control without custom tuning the ECM.