Quote:
Originally Posted by dhjenkins
I hope you're referring to "all other TXV systems" in MB's ONLY. Most other manufacturers have their low pressure switch in the low pressure line, becuase it makes more sense to do so. A high side pressure of 30 psi in the high side is a VERY low pressure, and likely to not be circulating compressor oil.
I'll be the first to admit, I know little about MB's, but I've spent 15 years wrenching on every other make, along with handling stationary, residential, commercial & "other" systems.
You could absolutely be correct - but having a low pressure switch on the high side seems silly, especially since a leak on the suction side could easily not trip a low-side switch placed on the high side because the compressor could still pump atmospheric air above 30 psi.
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I know that I am correct. Most other manufacturers use CCOT systems, and these do use a low-side cut-out switch. However, most (but not all) European cars use TXV systems which do not cycle during normal operation. The only thing that cycles a TXV system is the evaporator temperature sensor.