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 Originally Posted by pacnw
We are a lennox dealer, and I haven't heard this. What is their reasoning?
Worry is a really gross misuse of one's imagination. -- PHM
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I meant that they are manufactured so that cannot get the CRT on one or both service valves.
The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
from an excerpt by Paul Jacob in Sun City, AZ
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You can also evacuate without a core removal tool.
- pull schraders
- evacuate
- when evacuation is complete , open liquid service valve and allow pressure to reach 5 to 10 lbs on low side , then re-close liquid valve
- if package unit or system void of refrigerant then add charge to reach the 5 to 10 lbs then stop
- remove hose , place thumb over port and then quickly install schrader
- little refrigerant is lost
Just another option
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 Originally Posted by pacnw
I meant that they are manufactured so that cannot get the CRT on one or both service valves.
Ahh yes, now I see what you mean.
Worry is a really gross misuse of one's imagination. -- PHM
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I like to have my micron gauge as far away from vac pump as possible. Also, I leave the cores in. My core removal tool works great on core replacement of a "pressurized system". I would not trust that it is tight enough to pull vacuum through.
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 Originally Posted by socotech
I like to have my micron gauge as far away from vac pump as possible. Also, I leave the cores in. My core removal tool works great on core replacement of a "pressurized system". I would not trust that it is tight enough to pull vacuum through.
Aside from adding a service port somewhere on the system, right off the CRT is as good as it gets. Heck I suppose a guy could try put the gauge at one service port and hoses on the other?
Brainstorming... Is there a way to test the vacuum capability of a CRT? Putting my vacuum hoses on one CRT and a coupler at the female end of CRT with my gauge on it? When it pulls down I can blank off my pump, see what it holds.
"I've got my Gas Mechanics license"
"Yea, well my 16yr old daughter has her drivers license, doesn't mean she knows how to drive"
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Where and how are you blanking off?
Sent from my ADR6350 using Tapatalk 2
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The JB pump has an isolation valve right on it, turn the knob 45* and it's blanked off.
"I've got my Gas Mechanics license"
"Yea, well my 16yr old daughter has her drivers license, doesn't mean she knows how to drive"
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Lots of good ideas with this thread, and lots of things I'd like to try. To be honest, I usually just evacuate right through my gauges and right through the cores though, just because I'm in a hurry and also when I know the system should be fairly good (i.e. little or no exposure, same day service, no burnout, etc.)
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Here is my question. When you go to put the schraders back into the service ports using the VCRT how do you keep that small amount of air from entering the sytem?
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 Originally Posted by JTCHVAC
Here is my question. When you go to put the schraders back into the service ports using the VCRT how do you keep that small amount of air from entering the sytem?
Charge the system first.
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 Originally Posted by 270wsm
Charge the system first.
Facepalm
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