does anyone know what a standard a/c pump operating pressure would be!
mugenb20b,
Jul 3, 10:52pm
Suction or discharge!
ariarne,
Jul 3, 10:58pm
discharge. want to try plumb up an airtank for inflating tyres. thought the old ac pump might be usable
mugenb20b,
Jul 3, 11:02pm
Yes, it will be. You need to add a piece of pipe to the suction side with a small air filter on it. You should put a few drops of oil in it (at the suction side) before each use.
ariarne,
Jul 3, 11:08pm
cheers. is it a constant psi or does it fluctuate with revs!
tonyrockyhorror,
Jul 3, 11:30pm
What a rigmarole.
mugenb20b,
Jul 3, 11:33pm
That's where the problem is. You will need to plumb the discharge side into a tank and fit a cut out switch. Personally, I've never done this, but other people in my 4WD club have. I simply biffed my A/C unit and bought a 12 volt air compressor. Have a look at OffRoad Express forums, they may have more info about it.
mugenb20b,
Jul 3, 11:35pm
Yes. One of my old trucks had this set up, and an extra tank under the body etc. I don't like carrying extra weight, so I dumped the lot and bought a small 12v compressor instead. It took less space and was lighter.
cuda.340,
Jul 4, 2:02am
buy one of them spark plugs with the air fitting on it. way faster for pumping up your tyres than the puney little a/c pistons have & if its a rotary comp then foget it. a bicycle pump is quicker.
ariarne,
Jul 4, 2:21am
its diesel so doesnt have anywhere to put a sparkplug
carclan,
Jul 4, 3:42am
There is no standard as the discharge pressure will vary with temperature PV=MRT
Suction pressure will vary depending on evaporator temperature and expansion valve setting and the both suction and discharge pressure will vary system to system depending gas type i.e R 717 will evaporate at a different pressure than R 22 or R 134A
4piggy,
Jul 4, 3:56am
ac compressor will pump to over 500psi or till belt slips so you will have to fit pressure switch in the system
carclan,
Jul 4, 4:01am
I brought a air compressor for $200.00 on special at Super cheap autos about a year ago and never missed a beat. Got a free air hose that I did not need and sold it for $45.00. Save alot of dicking around.
cuda.340,
Jul 4, 4:16am
a a/c comp might pump 500 psi of refrigerant but not air sorry. refrigerant expands with heat & the pressure will increase but air doesn't expand at the same rate.
elect70,
Jul 4, 10:03pm
Problem is they pump the oil outwith the refrigerant & as no return it will seize . Unless you buy /build an oil separator& plumb it into the suction side . Seen many try to usedomes asair copsbutsoonseize
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