I found it interesting to see how tech's did it different to me. To the people that question the methods and what they did wrong I would recommend you so you take the time to put up a video showing how to do it right then see how many people question your methods. To the guys at Emerson that took the time to show other HVAC guys how they do it thanks. Whether you follow their methods or not its your decision. yes they misquoted a few things like 76000microns but really!
When you have pulled a vacuum and then disconnect the hose from suction line, wouldn't a little atmospheric air enter as you disconnect the screw connector?
I thought the oil in the vacuum pump is to lubricate the vanes. Yes some types of oil absorb moisture. tho I don't see how that affects the air pressure or vacuum suction, and the valves are closed.
The video was helpful, thank you. I’m confused. What difference could it possibly make if it’s a high humidity or dry day? You just filled and emptied the entire system with dry nitrogen. Atmospheric humidity shouldn’t make any difference, there’s only nitrogen in the system.
High humidity simply put means more moisture exposure resulting in potentially longer evacuation times. Proper procedures and well-maintained equipment can minimize evacuation time under any conditions.
What is the “manufacturer’srecommended amount if time”? Yes, i understand it will vary, but you didn’t mention it, give us a ball park, 10 minutes, 10 hours?
I’ve seen jobs where proper values were achieved in approximately 30 minutes. I have also seen jobs where it took in excess of 48 hours to achieve proper values. Line set lengths, pump out hose condition and diameter, evacuation pump size and oil condition , ambient weather condition, Schrader valve left in or removed there can be a lot of ancillary factors to contribute to the time required to achieve proper values.
There is no high-pressure or low-pressure designation when performing a system evacuation. Ideally reinforced vacuum hoses with a larger diameter would be preferred.
Why while your at it don't you crack the nut on the high side and actually purge the system with nitrogen to remove all the air, as you have just compressed the existing atmospheric air in the indoor unit and lines? Then test for leaks and then vaccum test.
That is a sound practice and perhaps we should edit the video to include that part of the procedure. I have found in most instances The 500 pound test sample is sufficient to absorb and purge the majority of atmosphere prior to the evacuation process.
I think you guys know what you're doing but you got a LOT of things wrong, especially with nomenclature. Re-do your video because a lot of people watching this will be confused and "get it wrong". I know these videos take a lot of time to make, edit and post ... but when you get it wrong ... it's wrong.
Can you expand on what they did wrong? As a newbie I only saw when removing the line from the service port under negative vacuum they introduced a bit of air into the system instead of getting it to+ pressure...
I found it interesting to see how tech's did it different to me. To the people that question the methods and what they did wrong I would recommend you so you take the time to put up a video showing how to do it right then see how many people question your methods. To the guys at Emerson that took the time to show other HVAC guys how they do it thanks. Whether you follow their methods or not its your decision. yes they misquoted a few things like 76000microns but really!
thanks for posting very interesting
When you have pulled a vacuum and then disconnect the hose from suction line, wouldn't a little atmospheric air enter as you disconnect the screw connector?
Using a Schrader valve removal tool during the evacuation process could eliminate any atmospheric air entering when breaking connection.
17:15 You have just added the air to the system by schreader valve. :O
What is the make and model of your single gauge manifold?
I thought the oil in the vacuum pump is to lubricate the vanes. Yes some types of oil absorb moisture. tho I don't see how that affects the air pressure or vacuum suction, and the valves are closed.
The video was helpful, thank you. I’m confused. What difference could it possibly make if it’s a high humidity or dry day? You just filled and emptied the entire system with dry nitrogen. Atmospheric humidity shouldn’t make any difference, there’s only nitrogen in the system.
High humidity simply put means more moisture exposure resulting in potentially longer evacuation times. Proper procedures and well-maintained equipment can minimize evacuation time under any conditions.
What is the “manufacturer’srecommended amount if time”? Yes, i understand it will vary, but you didn’t mention it, give us a ball park, 10 minutes, 10 hours?
I’ve seen jobs where proper values were achieved in approximately 30 minutes. I have also seen jobs where it took in excess of 48 hours to achieve proper values. Line set lengths, pump out hose condition and diameter, evacuation pump size and oil condition , ambient weather condition, Schrader valve left in or removed there can be a lot of ancillary factors to contribute to the time required to achieve proper values.
Why are your yellow and blue hoses hooked up backwards?
There is no high-pressure or low-pressure designation when performing a system evacuation. Ideally reinforced vacuum hoses with a larger diameter would be preferred.
Why while your at it don't you crack the nut on the high side and actually purge the system with nitrogen to remove all the air, as you have just compressed the existing atmospheric air in the indoor unit and lines?
Then test for leaks and then vaccum test.
That is a sound practice and perhaps we should edit the video to include that part of the procedure. I have found in most instances The 500 pound test sample is sufficient to absorb and purge the majority of atmosphere prior to the evacuation process.
Funny as I have the same name as Kevin Shea!
EPA specifies test pressure no more than low side test pressure.
On 410a system 150psi on the low side is not enough to find a leak I'm affraid it's happened before
So no need to remove the schrader valve. I am a rookie and have seen that it's important?
Remove the Schreader valve if you don’t want it to take hours to really pull the vacuum
Would you dump out your refrigerant as soon as you removed the gauge line?
760,000 microns = Atmospheric pressure
I think you guys know what you're doing but you got a LOT of things wrong, especially with nomenclature. Re-do your video because a lot of people watching this will be confused and "get it wrong". I know these videos take a lot of time to make, edit and post ... but when you get it wrong ... it's wrong.
Can you expand on what they did wrong? As a newbie I only saw when removing the line from the service port under negative vacuum they introduced a bit of air into the system instead of getting it to+ pressure...