How testing a recovery unit before buying ??

[pvl]

Hi all
I would buy a used recovery machine. before paying I would try there. Is there a simple way to test ?
I await your suggestions!

[hyperion]

Plug it in and check if the compressor runs with the suction valve closed. Then check to see if it pumps. Other than that you take your chances as with anything second-hand.

[pvl]

Hi Hyperion, the compressor can run pumping air?

[Rob White]

Hi Hyperion, the compressor can run pumping air?

It won't like it but it will run on air for a short while.

Close the inlet and open the outlet, run the machine and see
if it sucks a vacuum. Open the inlet while still running and slowly
close the outlet and see if the discharge goes up.

If it does that's about all you can do without running it on refrigerant.

Rob

.

[chemi-cool]

You can do as Rob said but use a Nitrogen to test it at very low pressure [or you might find yourself on a ski resort on the alps]
Whts realy important is to see that the suction and discharge valves are in good order, i,e, holding the pressure.
Let the hige pressure rise to about 400psi to check the safty high pressure switch.
let it draw vacuum to check the low pressure switch.

I would not go into such adventure unless the machine is almost new.