ZENY 4CFM 1/3HP Electric Vacuum Pump Refrigerant R410a R134a HVAC Deep Vane Air Conditioner w/ 1/4" Flare Inlet Port
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Voltage /Frequency: 110V/60Hz
Flow Rate:VP135: 4 CFM
Ultimate Vacuum: 5 Pa
Warm note: Inlet Port: 1/4" Flare
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1) Must unscrew the exhaust fitting to fill oil, as other reviews have stated if you pour the oil into the exhaust fitting it has to filter down through the exhaust.
2) In order to fit a typical AC gauge you need a 1/4 inch flare female x 1/2 inch Acme male adapter
3) The oil included is JUST enough to fill this to the minimum line, so it's advantageous to purchase vacuum pump oil when you get the unit.
This review is for the Zeny 4CFM unit.
I have included two photographs, one is the exploded diagram of the unit, and the other is the specs sheet for the various Zeny units. The spec sheet is also helpful because it lets you know the oil capacity for each of the vacuum pumps.
I hade changed out the AC hose assembly and accumulator so I let it run from two hours (one probably would have been enough) the motor was mildly hot but not eccessive.
Overall it did a great job, even for a single stage compressor. It even came with the compressor oil in the box. That was a big plus.
YOU MUST REMEMBER TO FILL WITH OIL BEFORE YOU TURN THE PUMP ON!
NOTE: Some fluid collected around the exhaust vent. My solution was to put on a rubber hose to vent away from the unit. See the picture.
Not sure why others feel this won't pull down a proper vacuum.....
EDIT 3/5/19: I've had this pump 2 years now. I've used it DOZENS of times; mostly doing a/c work on my and family member's cars. It has performed very well. Maybe I'm lucky....mine doesn't seem to have any of the issues others were having. My only advice: This is a low priced Chinese tool; thoroughly check it over before using. And do try it out before your return window is up.
STILL a 5 star review.
I removed the inlet fitting and replaced it with a vacuum gauge and quick disconnect fitting. (You have to remove the handle to do this.) The pump housing is tapped 1/4-NPT.
It does spew a lot of oil from the exhaust if the inlet is open to atmosphere, but as soon as you let it draw a vacuum it settles down. I put a piece of silicone hose over the exhaust port and put the other end in a bucket, then draped an old towel over the top of the bucket. DIY filter. After 5 hours of continuous running, there was just a tiny film of oil on the bottom of the bucket and I could not tell that the oil level had moved in the sight glass. So consumption is actually pretty low.
I really like how quiet this pump is. With it ten feet away from where I'm working, I can hear it but it is not noticeable. Perfect for what I'm doing with it.