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I don't think they worried about low pressure - they may have wanted the system to run even if it was slightly low on charge. But that's just a guess. I guess it could be a binary switch but I don't have any evidence one way or the other without asking Red Dot besides the nomenclature not mentioning any low pressure cut-out function.
I know enough to be dangerous with HVAC - I own a repair/performance shop and so to buy refrigerant and legally work on AC systems in vehicles you must complete SAE training to get the license or they won't sell you the stuff (in bulk anyway - you can buy small cans over the counter but not the 30lb cylinders). Then you have to buy a machine to properly recover the refrigerant - that was only $5,000 or so.
So do you have a diagram for this unit? I'd love to see it!
Isn't that how it always works?!
There is a low and a high pressure switch.
Yes, you are quite correct. I have A0 that did not have AC at all. I was prepaired for that until I discovered that I have two more wires that are not on this diagram: Black/White stipe and Orange. I am guesing it is for the new protector box for some sensors. I am concerned that that protector will prevent the unit to work w/o those/this sensor.
You are fundamentally correct. It's not a protector - it's literally controlling the whole system and has direct control over the compressor clutch so unless you get the transducers it's expecting and put them where it expects them - expect it to not function.
Do you have that sensor?
Army wheeled vehicle mechanics are definitely not professional HVAC technicians and while they do get some training on vehicle AC systems it's sometimes a struggle for them to isolate the exact cause of a malfunction so Red Dot integrated a basic self-diagnostic computer that helps to direct attention to problems and likely in many cases saves time and money from technicians throwing parts at the problem and likely saves compressors from being damaged by running them with low refrigerant levels leading to oil starvation.
