Quote:
Originally Posted by SilberUrS6
Oh, but here's the deal - because there is a pressure relief valve on some cars, that's all the proof he needs.
No actual data, just the mere existence of such a device "proves" his point.
So, in your opinion, conclusion, why is there a BOV included in most BOOSTED engines..?
No need to actually SHOW that this is what indeed happens. (Oh, and BTW, happens enough to deplete the charge in two years or so, never mind the physics of the thing, which states that with less refrigerant, the less likely the high side pressure will be over the relief valves actuation pressure). Change the subject. That's his favorite tactic.
|
Yes, the BOV indicates that it is undesireable for then R-12 refrigerant pressure to exceed 350-450 PSI, for whatever reason. That would mean, by default, that pressures below that measure might well be common in the normal operation of R-12 systems.
R-134a Binary pressure switches open the low side at ~28 PSI, the high side at close to 400 PSI, That's right,
400 PSI! In my meager experience it's the low side pressure sensing that most often cycles the compressor off and on.
The extra function in the Trinary pressure switch is most often used to run a condensor (& radiator) cooling fan/blower with high side pressures above 225 PSI but not below 185 PSI.