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10-31-2009, 06:30 PM
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#16
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Newbie
Join Date: Oct 2009
Location: Los Angeles
Posts: 21
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Well First I attach my manifold gauges to the service port on the condensing unit. Then I attach my yellow hose to the vacuum pump. Then I proceed to pull a vacuum through the low side gauge. I understand that the hoses on the manifold may have some refrigerant oil leftover from the last job but how could the system be contaminated if the vacuum is pulling everything out of the system?
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10-31-2009, 06:40 PM
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#17
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An old Tradesmen
Join Date: Oct 2008
Location: Lanc PA
Posts: 3,691
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System may not be contaminated. But, if your hoses are. You won't get a good reading. And can end up chasing your tail trying to find out why.
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10-31-2009, 08:28 PM
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#18
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as seen on tv
Join Date: Mar 2009
Location: Detroit
Posts: 89
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You can use copper refrigeration tubing with flare nuts on the ends to connect to gauge ports and such
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10-31-2009, 08:31 PM
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#19
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as seen on tv
Join Date: Mar 2009
Location: Detroit
Posts: 89
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faster recovery=liquid first vapor last. keep a bottle in a vacuum and refrigerate it for fast recovery
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10-31-2009, 08:36 PM
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#20
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An old Tradesmen
Join Date: Oct 2008
Location: Lanc PA
Posts: 3,691
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Quote:
Originally Posted by qbert
faster recovery=liquid first vapor last. keep a bottle in a vacuum and refrigerate it for fast recovery
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We're still working on vacuum. We didn't get to recovery yet. 
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10-31-2009, 09:12 PM
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#21
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old pro
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 1,663
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Should I tell him about the "beer can cold" technique of charging? 
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10-31-2009, 09:16 PM
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#22
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An old Tradesmen
Join Date: Oct 2008
Location: Lanc PA
Posts: 3,691
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Quote:
Originally Posted by yuri
Should I tell him about the "beer can cold" technique of charging? |
Your in a mean mood tonight. 
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10-31-2009, 09:24 PM
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#23
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old pro
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 1,663
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Yeah, the weathers getting harsh here and I'm trying to figure out how to make "Freedom 55" work.
Shoulda been born rich instead of handsome. 
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10-31-2009, 09:29 PM
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#24
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An old Tradesmen
Join Date: Oct 2008
Location: Lanc PA
Posts: 3,691
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10-31-2009, 09:36 PM
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#25
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Old Newbie
Join Date: Aug 2009
Location: Ottawa Valley, Eastern Ontario, Canada
Posts: 51
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Quote:
Originally Posted by yuri
Yeah, the weathers getting harsh here and I'm trying to figure out how to make "Freedom 55" work.
Shoulda been born rich instead of handsome. |
How harsh is it?
Still waiting.
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10-31-2009, 09:58 PM
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#26
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old pro
Join Date: Nov 2008
Location: Winnipeg, Canada
Posts: 1,663
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-2degC but the damn north wind is up to 40km/hr. Some kind of huge Colorado low. Blame the Yanks.
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10-31-2009, 10:12 PM
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#27
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Old Newbie
Join Date: Aug 2009
Location: Ottawa Valley, Eastern Ontario, Canada
Posts: 51
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A tropical +8C here. 
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11-01-2009, 02:36 AM
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#28
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Newbie
Join Date: Oct 2009
Posts: 8
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I guess we should be nice and tell you that a dirty evap. coil, dirty filter, indoor fan motor running too slow or squirell cage clogged with all kinds of stuff can make it ice up also.
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11-01-2009, 06:43 PM
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#29
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Newbie
Join Date: Oct 2009
Location: Los Angeles
Posts: 21
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LOL You know, I hate California but when I hear about it being below 0 in other places I am grateful for the southern california sun. Well, mike, thanks for your input. I knew all of those things would cause a frosted coil. Also if the TXV is bad that could cause a frosted coil too. I was just wondering why a low charge would cause a frosted coil. Now I know why is because lower pressure causes lower temperature in the lines. I actually was learning the recovering technique in class on friday and the teacher had us set the recovery machine to vapor the whole duration of the recovery. The unit we worked on was a three ton unit which is small but it didn't take too long for recovering vapor. My question is this: When recovering liquid, does it matter which part of the recovery tank you hook up to? (The red knob or the blue knob? When we recovered vapor we hooked up the hose to the blue side of the tank)
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11-01-2009, 06:46 PM
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#30
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Newbie
Join Date: Oct 2009
Location: Los Angeles
Posts: 21
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Oh, yuri, I have heard about the beer can cold method of charging but I havent been explained in detail. I know thats how my boss does it. He charges the system until the suction line is cold and checks for the 20 degree split and goes from there.
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