HVAC Triple Evacuation
October 25, 2010 by Air Phase - All About Air Conditioning
Filed under hvac
I show how to triple evacuate an air conditioning system, getting it ready to charge with refrigerant. **SHOUT OUT** Hello to: The faculty and students at the HVAC/R program at San Jose City College in San Jose, California.
Dr Zarkloff how has your luck bening with the cps micron gauge was thinking of buying one.
@richardb3 This is the recommended way to evacuate a system. I can’t do anything about the service calls piling up. This is yet another way how real world situations and text books clash.
Wow 3 hours to Evac a system. Then if you have a leak its up to six hours to evac a system. Who in the world has 6 hours working on one A/C in the day. when you have service call piled up. there has to be a faster way.
@Jumpstartme65 That’s why it’s a good idea to back purge the hose before charging.
Hi Dr Z, love your videos. I’m thinking, before you remove the charging hose from the vacuum pump, the hose would contain a vacuum which would suck in air the second you disconnect it from the vacuum pump. This would mean that the air in the hose would mix with the nitrogen once the nitrogen is applied. The mixture would then be pushed into the system. Does this matter? I have ball valves at the end of each hose. Am I being too fussy?
Hi Dr Z, love your videos. I’m thinking, before you remove the charging hose from the vacuum pump, the hose would contain a vacuum which would suck in air the second you disconnect it from the vacuum pump. This would mean that the air in the hose would mix with the nitrogen once the nitrogen is applied. The mixture would then be pushed into the system. Does this matter? I have ball valves at the end of each hose. Am I being too fussy?
@cristopherdale It could be because the line that you have the micron gauge connected could be open to the atmosphere.
afteryou get down to 500 microns and you shut the vacum pump.before puting refer in why does the micron guage climb in numbers
The other reason that you might not be able to pull 500 microns is that the vacuum pump cant pull it down. In that case you need to fix your pump.
@ptbarnumbank Thanks for the compliment. I’m just an air conditioning tech.
i like your videos. Are you an instructor somewhere? If not, you should be.
@hvacjeffco That’s what I was thinking.
@rafaeldelaflor Yes. Hydrocloric acid is bad.
hydrochloric acid is just a little bad for compressor life right? Or Wrong?
hydrochloric acid is just a little bad for compressor life right? Or Wrong?
@Rueuhy It’s important to remove as much moisture as possible from the system. Nitrogen will soak up the moisture and allow you to pull it out easier with the vacuum pump.
Just curious – why not put the vacuum gauge on and ensure you can get down to 500 microns first and ensure you have no leaks before using the nitrogen? Is it because of the moisture in the system will not allow it before the nitrogen purge? Thanks for any answers.
@FlatOhead Thanks for watching.
right on the mark Dr so “sickbastard 80″ maybe you should be taking tyhe docs advise and evacuating. Although in a mild form it is Hydrochloric acid. Keep the videos coming Dr
@FlatOhead Acid eats away the isolation around the windings.
here is a thought/tip for you…………
When breaking the vac with Dry Nitrogen in tripple evacuation, try…. Making a coil out of some copper, (3/8″)put a 50 watt domestic light in the middle of the coil and turn it on. Allow the nitrogen to go through the copper, it is warmed up the nitrogen enough and will absorbe more moisture, therefore giving you a dry system…. What does moisture form when mixed with refrigerants/freon, acid What does acid do to motor windings?
@sickbastard80 I advise you to evacuate but you can get away with it if your system is dry in a R-22 system. I wouldn’t even try it with a R-410a system.
i’ve had 3 different employers NON OF them ever evacuate, they say it’s a waste of time and money. what do you think z??? of course all they do is A/c not refrigeration. is it really necesary to evacuate?? cos as far as i know NOBODY i know evacuates. i live in north idaho though, northern dry dessert kind of weather.
@xaymik It came with the micron gauge.
did you make that T for the micron gauge yourself or did it come like that?