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Recovery machine question

wptski on Thu October 17, 2013 8:50 AM User is offline

Got a Mastercool 69100 which has the oil recovery drain. I recovered a system and there was no oil recovered from its drain but later while disconnecting the gauge manifold there was some oil in the low side hose. I'm wondering if I did something wrong to cause this or is it something normal that can happen?

TRB on Thu October 17, 2013 10:42 PM User is offlineView users profile

Call Bobby at Mastercool.

I have never used this machine but sold a few.

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wptski on Fri October 18, 2013 2:26 PM User is offline

Quote
Originally posted by: TRB
Call Bobby at Mastercool.

I have never used this machine but sold a few.
Bobby is long gone so I talked to somebody else at Mastercool.

truckairpartsguy on Fri October 25, 2013 2:49 PM User is offline

What did they tell you? It is clearly misleading if not truly a recycling machine. They have plenty of other recovery units not claiming to recycle, so not sure what the point would be.

wptski on Fri October 25, 2013 9:31 PM User is offline

They said it was excess oil which really I don't believe. This wasn't a vehicle but a dehumidifier using R410A. R410A uses POE oil as R134A can but not the same viscosity. I called the manufacturer but shockingly they couldn't even tell me what type let alone the viscosity! They what's shipped in the compressor is what they use and have never added anything. So this kind-of make the answer that what I found was excess oil, incorrect.

In order for the machine to remove oil it has to get it inside the machine. Pulling a vacuum doesn't remove remove oil or it hasn't for me. I think if oil does come out of the system, it would come with the liquid refrigerant. I opened the high side manifold first which removed most of the charge. Not much was removed after the low side manifold valve was opened and the oil was in the low side hose. Don't remember if I closed the high side or left it open. I'm reading that your supposed to leave it open. Trying to blame myself if I can.

Since this system only uses 16oz of R410A, it probably does uses much oil that's why I was concerned although it wasn't that much.

Edited: Fri October 25, 2013 at 9:52 PM by wptski

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