Tranfering Refrigerant from one cylinder to another

[A1_Autos]

Just a quick question, I just want to know when using a recovery unit to transfer refrigerant from one cylinder to another or indeed from a system into a recovery bottle, is it ok and indeed safe for the Recovery Machine, to allow it to pull into a high vacum on the inlet - (suction) side of the machine where it is pulling refrigerant in, just to ensure that all contents of the cylinder that I am recovering from have been completely removed. Is this harmfull to the recovery machine at all or not? Becuase if I dont do this then surely there will would be a small amount of refrigerant left over after finishing the recovery process.
Or do I just wait for the pressure to drop to 0 psi/bar on the Inlet side of recov Unit and no further????
Hope that makes sense, Thanks... :D

[nike123]

An automatic low-pressure cut-off switch turns the machine off at 15" of vacuum, eliminating unnecessary wear and tear on the machine

http://www.tequipment.net/PromaxRG5410A.asp

[cool runings]

Just a quick question, I just want to know when using a recovery unit to transfer refrigerant from one cylinder to another or indeed from a system into a recovery bottle, is it ok and indeed safe for the Recovery Machine, to allow it to pull into a high vacum on the inlet - Thanks... :D


Taking it to just below 0 is low enough.
Yes there will be some gas left inside the cylinder or system but you have made every effort to remove as much of the refrigerant as possible.

coolrunnings

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[A1_Autos]

Thanks for that, I didnt know about the low pressure cut off switch. Thanks..:D

[cool runings]

Thanks for that, I didnt know about the low pressure cut off switch. Thanks..:D


Not all makes have a LP switch.

So check the one you have to see if it does or does not.

If it does not it will just run on forever.

coolrunnings

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[El Padre]

We are required to recover to 0 barg, if you pull the system into a vacuum you will only be increasing the chance of air and therefore moisture entering the system.

Cheers