Vacuum Pump Oil In Gage Set Lines - HVAC - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > HVAC

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 06-11-2011, 02:42 AM   #1
Newbie
 
Join Date: Jun 2011
Posts: 5
Rewards Points: 10
Default

vacuum pump oil in gage set lines


after evacuating a mini split system the gauge set lines seemed to be full of vacuum pump oil. On a r-410 system is this something that would be a system killer or just reduce the system efficiency a little if some vacuum pump oil got in the AC system? The pump has a check valve and to my knowledge was not unplugged. The electronic vacuum gauge was showing 140 microns when I closed things off. I did not notice the oil until I had opened the valves on the unit so I can not "check" the lines to see if there is oil. Choices are recover the charge, clean and start over or run it. I do not have the recovery tools or access to refrigerant so not an easy thing to be cautious. The system might be dry or it might have several ounces of vacuum pump oil in the lines.

Advertisement


Last edited by CMatHome; 06-11-2011 at 03:02 AM.
CMatHome is offline   Reply With Quote
Old 06-11-2011, 07:37 AM   #2
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 10,061
Rewards Points: 760
Default

vacuum pump oil in gage set lines


If you had a vacuum in the lines and then opened the service valves the large pressure of the freon inside the condensor would fill your hoses and pressurize them and the oil in them. The only way it should/could get in the system is if you added some more freon to the lines as the flow would be into the system. Nothing you can do about it now as it may mix with the compressor oil. If it is too thick the capillary lines will plug and it won't cool properly so you should notice that.

Advertisement

__________________
"Cut it twice and it is still too short".
yuri is online now   Reply With Quote
Old 06-11-2011, 08:08 AM   #3
Member
 
biggles's Avatar
 
Join Date: Jan 2008
Location: Long Island
Posts: 3,630
Rewards Points: 2,000
Default

vacuum pump oil in gage set lines


did you lose the oil level in the pump itself if not it's no big deal
biggles is offline   Reply With Quote
Old 06-11-2011, 08:35 AM   #4
Newbie
 
Join Date: Jun 2011
Posts: 5
Rewards Points: 10
Default

vacuum pump oil in gage set lines


Quote:
Originally Posted by yuri View Post
If you had a vacuum in the lines and then opened the service valves the large pressure of the freon inside the condensor would fill your hoses and pressurize them and the oil in them. The only way it should/could get in the system is if you added some more freon to the lines as the flow would be into the system. Nothing you can do about it now as it may mix with the compressor oil. If it is too thick the capillary lines will plug and it won't cool properly so you should notice that.
The gauge set has a valve on the end, it was closed when I opened the service ports.
CMatHome is offline   Reply With Quote
Old 06-11-2011, 08:37 AM   #5
Newbie
 
Join Date: Jun 2011
Posts: 5
Rewards Points: 10
Default

vacuum pump oil in gage set lines


Quote:
Originally Posted by biggles View Post
did you lose the oil level in the pump itself if not it's no big deal
The lines were full of oil. The pump level was down a little but still within the operational range.
CMatHome is offline   Reply With Quote
Old 06-11-2011, 09:10 AM   #6
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 10,061
Rewards Points: 760
Default

vacuum pump oil in gage set lines


Quote:
Originally Posted by CMatHome View Post
The gauge set has a valve on the end, it was closed when I opened the service ports.
You should be okay then. Apparently you are not supposed to go below 500 microns on an open system or it can damage the compressor. I watch the microns carefully and shut down the valves as soon as it drops below 500 on a closed or open system. Apparently the oil starts to flash into vapor or some such a thing. Maybe Beenthere or one of the other guys has heard of this too ???
__________________
"Cut it twice and it is still too short".

Last edited by yuri; 06-11-2011 at 09:13 AM.
yuri is online now   Reply With Quote
Old 06-11-2011, 09:53 AM   #7
Newbie
 
Join Date: Jun 2011
Posts: 5
Rewards Points: 10
Default

vacuum pump oil in gage set lines


The vacuum was just on the lineset. So are you saying a little pump oil in the refrigeration loop might not hurt? My delima is that I don't see how it got tree in the first place so I have no idea the level of contamination if it exists.
CMatHome is offline   Reply With Quote
Old 06-11-2011, 10:08 AM   #8
Member
 
Join Date: Oct 2009
Location: Nebraska
Posts: 2,362
Rewards Points: 1,000
Default

vacuum pump oil in gage set lines


As yuri said there's nothing you can do about it now short of replacing the compressor and flushing the rest of the system. Might as well wait and see what happens.
Marty S. is offline   Reply With Quote
Old 06-11-2011, 10:16 AM   #9
Hvac Pro
 
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 10,061
Rewards Points: 760
Default

vacuum pump oil in gage set lines


You did not introduce a positive pressure and vac pump oil into the system because the valves on your gauges were closed. The only way that oil could get into the system is if you hooked up a bottle of freon and added some to the system to compensate for the extra line set if the specs required it. That freon would take the vac pump oil with it into the system. You have no worries if you did not add freon.

Advertisement

__________________
"Cut it twice and it is still too short".
yuri is online now   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Do I need seperate vent stacks for basement pump and basement sink? twinfins Plumbing 5 12-08-2010 12:28 AM
Help with Heat Pump System Wiring AlanScott HVAC 11 10-10-2010 01:19 PM
Sewer gas smell in basement from sump pump mirage212 Plumbing 15 10-23-2008 07:09 PM
Foundation drain and sump pump slatergrl Plumbing 3 02-10-2008 10:36 AM
sump pump continuing running deck hand Plumbing 2 01-16-2008 05:35 PM




Top of Page | View New Posts