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Re: Adding high pressure switch to older unit help.
Posted: Sun Aug 27, 2023 8:54 am
by tbirdtbird
GM- "There needs to be a separate relay or diode in the circuit to avoid this." This is how I have always done this (relay), especially since these spal fans are easily drawing 12 amps
Re: Adding high pressure switch to older unit help.
Posted: Thu Aug 31, 2023 10:14 am
by Vetteman61
I stop receiving notifications on this thread and didn't realize there had been responses.
GM Tech, I agree, I also do not want the fans spinning when not needed, which is why I have determined the pressure sensor to be my best alternative. Would the sensor that went in the back of the old A6 compressors mount in the same port that I could purchase and have spliced into the high side of the AC line?
Re: Adding high pressure switch to older unit help.
Posted: Thu Aug 31, 2023 10:27 am
by Vetteman61
GMTech, I looked up the switch you mentioned. It was exactly what I had in mind, but it unfortunately didn't turn on at the PSI I needed. Thank you, however, as you're the first person to actually answer the question and provide the information rather than just tell me to do it a different way.
Even though the switch didn't fit in the correct PSI range, I was able to use some of the terminology on the specifications to help locate others. Do you believe this would be suitable for an automotive AC system?
(Link deleted)
Re: Adding high pressure switch to older unit help.
Posted: Thu Aug 31, 2023 11:59 am
by JohnHere
JohnHere wrote: ↑Fri Aug 25, 2023 6:36 am
... . Opinions vary, but setting the high (fans on) limit to around 250 PSI and the low (fans off) limit to around 190 PSI seems reasonable. ... .
Does the pictured pressure switch operate at or around the previously mentioned limits? If so, it can likely serve your intended purpose.