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Safe Pump Down Procedure of an Air Conditioner or Heat Pump! 

AC Service Tech LLC
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In this HVAC Video, I go over the Safe Pump Down Procedure of an Air Conditioner or Heat Pump. I go over tips and strategies for best pump-down results. Supervision is needed by a licensed HVACR Tech while performing tasks as Experience and Apprenticeship garners Wisdom and Safety.
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⚠️ Disclaimer:
Information in this video is intended for educational purposes only. Any work related to the topics in this video should be performed by licensed technicians or by apprentices under the supervision of licensed technicians. AC Service Tech LLC is not responsible for any possible damages or injuries caused by the use or misuse of any information provided.
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26 авг 2024

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Комментарии : 96   
@acservicetechchannel
@acservicetechchannel 7 лет назад
Tool List- www.amazon.com/shop/acservicetech Support- www.patreon.com/acservicetech For those that are looking for the tools used in the videos: (Linked Below) Here is the Link for the 4 Port Yellow Jacket Brute Manifold Gauges and hoses- amzn.to/2igsEj0 Here is the link for the Ratcheting Service Wrench amzn.to/2dGV4Nh Here is the Link for the Yellow Jacket Refrigerant Manifold Gauge Set used in the videos- amzn.to/2aenwTq Here is a link to Refrigerant hoses with valves used in the videos- amzn.to/2aBumVI Here is a link to the UEI DL389 Multimeter used in the videos- amzn.to/2xAdaJf Here is a link to the Imperial 535-C Kwik Charge Vaporizer for Charging Refrigerant- amzn.to/2wFHtBW Here is the link to the Fieldpiece ST4 Dual Temp Meter- amzn.to/2wc1ME3 Here is a link to the Digital Refrigerant Scale used in the videos- amzn.to/2b9oXYl Here is a link for RectorSeal Bubble Gas Leak Detector amzn.to/2ckWACn Other tool links can be found in the video description section. ACSERVICETECH is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon. All of the ACSERVICETECH Playlists- ru-vid.com/show-UCOZR-1IqsAer9wzlvFgb4mAplaylists?view_as=public If you want to support the ACSERVICETECH Channel and receive more HVAC content, check out www.Patreon.com/acservicetech
@monterrozacesar5
@monterrozacesar5 6 лет назад
I was wrong then...like I say... you never stop learning. Excellent video. Thanks a/c service tech channel for sharing your knowledge with us.
@acservicetechchannel
@acservicetechchannel 6 лет назад
I am glad that the videos have been helping, thanks!
@morpheus101a
@morpheus101a 6 лет назад
Best Pump down video I've seen so far. Love the Channel, keep it up!
@acservicetechchannel
@acservicetechchannel 6 лет назад
Thanks Morpheus101a!
@rrodgers3285
@rrodgers3285 3 года назад
Wow awesome I learn more form u then my own shop amen thx bro
@acservicetechchannel
@acservicetechchannel 3 года назад
Glad to hear it
@sergiomelapelas3378
@sergiomelapelas3378 2 года назад
I don't always recover but when i do its because the landlord is watching me 😜
@jimbola77
@jimbola77 7 лет назад
thank you acservicetech!!!!!! you are one of the best on the tube love all your video's!!! iv'e learned to do thing's the right, way God Bless Sir!!!!!
@acservicetechchannel
@acservicetechchannel 7 лет назад
May the Lord Bless You Too Jimbola77! Thanks!
@f1otero
@f1otero 6 лет назад
How do you deal with the low-pressure switch shutting the compressor down (before full pump down) when the pressure drops.Your videos are excellentThanks
@acservicetechchannel
@acservicetechchannel 6 лет назад
I will have another video showing how soon but in the mean time, on a condensor, you just jump the 24v hot wire directly to the contactor instead of through the pressure switches with the common as the path back, thanks
@johntrauger68
@johntrauger68 6 лет назад
Good to stress caution when (if) starting a motor with a screwdriver. On the outside chance the windings are grounded there can be a tremendous amount of energy in the form of a fireball in the vicinity of your hand. Don't do it fellows unless you absolutely have to. Tip from an old motor guy.
@acservicetechchannel
@acservicetechchannel 6 лет назад
Nice comment, thanks!
@dcmarvelunited5529
@dcmarvelunited5529 6 лет назад
Great video sir, your information is very useful and makes alot of sense while being safe. Thanks.
@acservicetechchannel
@acservicetechchannel 6 лет назад
Thanks Ronald!
@chickedwin7194
@chickedwin7194 5 лет назад
Sir thanks soon much for your service
@acservicetechchannel
@acservicetechchannel 5 лет назад
Thanks Chick!
@abubakarrjalloh5975
@abubakarrjalloh5975 Год назад
Nice one
@acservicetechchannel
@acservicetechchannel Год назад
Thanks for watching
@nurfetalic205
@nurfetalic205 7 лет назад
Craig very nice explanations and good recommendations. Thank you.
@acservicetechchannel
@acservicetechchannel 7 лет назад
Thanks Nurfet lic!
@alcasper1908
@alcasper1908 Месяц назад
When the unit gets to a low amount of gas, won’t it shut down? How else will you pull the remaining gas into the unit if it’s not running unless you manually push in the contactor?
@eddiesaefong7945
@eddiesaefong7945 2 года назад
Pump down all day with contactor. Use insulated screw driver
@stacenm
@stacenm 6 лет назад
Is there a risk of overpresurizing the condenser coil with this method? Can you blow out the coil, or cause problems for the compressor itself? Also, I really love this channel, you have a real gift for explanation, and a mastery of the subject matter, thank you for the effort.
@acservicetechchannel
@acservicetechchannel 6 лет назад
Thanks Stacen. If you don't have microchannel coils then you have enough room in the condensor coils for the refrigerant on air conditioners. On refrigerators that have a receiver then you can pump the refrigerant in there, thanks
@breakbollocks9164
@breakbollocks9164 Год назад
@@acservicetechchannel - Thanks! Please tell how to recognize whether standard coils or microchannel?
@ve5618
@ve5618 6 лет назад
Good content and gear.
@acservicetechchannel
@acservicetechchannel 6 лет назад
Thanks V E!
@antwaingary1142
@antwaingary1142 4 года назад
Great video
@vicg1973vg
@vicg1973vg 5 лет назад
Questions,,what about if it has a low pressure switch n cuts off ,,and still has refrigerant in system??? Do you have yo use a recovery machine??,"or can u bypass the low pressure switch??
@acservicetechchannel
@acservicetechchannel 5 лет назад
We usually bypass the low pressure switch prior to doing the pump down, thanks!
@ocvasquez04
@ocvasquez04 7 лет назад
Keep up good work!
@acservicetechchannel
@acservicetechchannel 7 лет назад
Thanks Vasquez!
@JL-ss3ux
@JL-ss3ux 4 года назад
awesome video!
@khuongvtube
@khuongvtube 7 лет назад
Another great video and learned something new from you as always. Just a quick question, Is heatpump always default to the heat mode when the contactor was pressed down manually or it will run whatever mode it was last time called for?
@acservicetechchannel
@acservicetechchannel 7 лет назад
Typically if the unit is not Ruud Rheem or WeatherMaker then the reversing valve would be in heating mode when not powered by the tstat or in cooling mode when powered by the tstat, thanks!
@megalomani4k
@megalomani4k 2 года назад
Isn't there some sort of low pressure safety that shuts the outdoor unit off? Or does the t-stat somehow bypass that?
@jasons626
@jasons626 11 месяцев назад
This is why on a heat pump I do set the stat to cooling to energize reversing valve but still manually push in the contactor.
@frankiefranco4693
@frankiefranco4693 3 года назад
Can you do this procedure in a winter?
@victorvillafane252
@victorvillafane252 5 лет назад
Thank you for this video
@acservicetechchannel
@acservicetechchannel 5 лет назад
Thanks Victor!
@aleortiz9039
@aleortiz9039 2 года назад
Can you pump down 410a into the condenser? Thanx
@user-iz5hx6fe5x
@user-iz5hx6fe5x Год назад
I have been watching a lot of your videos as I am trying to understand how mini split heat pump systems work. I have been trying to find an answer to a what happened question. I know what I am about to write will have most ask why anyone would do this, but I was blindly following instructions from a company rep and this accident occurred simply due to a lack of knowledge on both sides. Anyhow, Mini Split, heat pump, rotary compressor, operating in heat mode. Liquid line closed, compressor begins to work harder and harder (can tell by sound it is producing), about 30 seconds in a loud but very quick burst/hiss sound erupts from inside the outdoor unit, suction line was closed and unit powered off. No visible damage inside outdoor unit. In that situation as it was clear that the compressor was working harder and harder, is there some type of relief valve or was that noise most likely the reversing valve moving itself to protect the system?
@mikeclark1756
@mikeclark1756 6 лет назад
great video.
@acservicetechchannel
@acservicetechchannel 6 лет назад
Thanks Mike Clark!
@kevinJmadsen
@kevinJmadsen 2 года назад
Is it safe for the compressor on a Goodman (Copeland) 410a heat pump to pump down. It seems there would certainly be enough room in the accumulator but I've watched a couple of videos that mention that it might not be recommended with 410A and/or a scroll compressor.
@ryansuperpollo
@ryansuperpollo 5 лет назад
Can you pump down a condenser on heating mode instead of cooling
@acservicetechchannel
@acservicetechchannel 5 лет назад
No, only in cooling mode, thanks
@moisessanchez870
@moisessanchez870 6 лет назад
Great video👍
@acservicetechchannel
@acservicetechchannel 6 лет назад
Thanks Moises!
@angelbreath6012
@angelbreath6012 6 лет назад
Is it legal to pump down an AC unit. It seems like I remember reading the EPA rules that you have to recover to a recovery tank
@acservicetechchannel
@acservicetechchannel 6 лет назад
We pump down in order to use the unit again. It makes more work for us to recover this back at the shop before disposal. Typically recovery at the site is best if you are disposing the unit, thanks
@randallcalhoun6604
@randallcalhoun6604 6 лет назад
what are your thoughts on pump downs on scroll compressors? some say dont do it into a vac etc. also i have had some compressors that wouldnt pump down. they made a noise internally that sounded like a relief valve. I havent found good info on if it was internal relief vs just a bad compressor. the one i can think of specifically would pump down to 40 psig then make a noise and go to 70 psi and no further. thanks for insights. good vids/channel
@acservicetechchannel
@acservicetechchannel 6 лет назад
Hey Randall, yeah on some older compressors, the pump down won't work because the internal pressure relief has become weak over time. Hermetic compressors use refrigerant and oil to cool and lubricate so when we are lower in pressure, it is not the best for the compressor. Some compressors are meant for this such as a pump down refrigeration unit. If the relief blows then just close the valves and then shut the unit off. You can pump down a scroll, just don't let it go into vacuum too far, thanks Randall!
@randallcalhoun6604
@randallcalhoun6604 6 лет назад
so if you find a compressor that will not pump down, that blows internal relief, is this an indication of faulty compressor? i had one that did this and had poor capacity to boot. all other things were normal. temp drop across coil was only 10degrees. cant remember pressures off the top of my head.
@acservicetechchannel
@acservicetechchannel 6 лет назад
It doesn't mean that the compressor is bad unless it is happening during normal operation on a very hot day. This component is off by itself inside the compressor housing and is separate from the compressor itself, thanks!
@alicepet1994
@alicepet1994 5 лет назад
Should a unit has receiver for you can do pumpdown, or any AC unit can do pumpdown? What's the benefit to do pumpdown and recovery? Thanks
@acservicetechchannel
@acservicetechchannel 5 лет назад
Pump down is done if you are going to use the outdoor unit again. Recovery is done if you are replacing the outdoor unit or the whole system. A pump down can be done on ac units that do not have a receiver as well, thanks!
@daddysfreepicks
@daddysfreepicks 5 лет назад
So if it is a heat pump run the thermostat on cooling and close the liquid line also right?
@acservicetechchannel
@acservicetechchannel 5 лет назад
Yes that is correct, thanks!
@zekenzy6486
@zekenzy6486 7 лет назад
thanks you
@acservicetechchannel
@acservicetechchannel 7 лет назад
Thanks ZE KENZY!
@bobrub
@bobrub 6 лет назад
Hi acservice tech, Great videos and presentation (hell of a teacher I'd say). Can you tell me if the refrigerant in the liq/suc gauge hoses are ALSO sucked into the compressor in this pump down process. My guess is yes, correct? Also, in this and a few other videos you refer to "a certain brand" unit commonly having the low pressure switch standard, so which is the "certain brand", can you say?
@acservicetechchannel
@acservicetechchannel 6 лет назад
Yes before performing a pump down, make sure to purge the air out of the hoses or air will get sucked in and mix with the refrigerant. In reference to certain brands, I meant higher efficiency, or more expensive models but all manufacturers have them but only on the model units that have all the bells and whistles. Cheaper standard units do not have the low pressure switch. Heat pumps often have a low pressure switch in them. Make sure to jump the low pressure switch before performing a pump down, thanks bobrub!
@bobrub
@bobrub 6 лет назад
Great, understood on both answers, thanks ..... and thank you so much for taking the time to respond and help out your brothers in the HVAC field.
@acservicetechchannel
@acservicetechchannel 6 лет назад
Glad to help bobrub!
@michaelcostello6991
@michaelcostello6991 6 лет назад
Is it physically impossible to do a pump down in heat mode ? You could store all the liquid in the indoor condenser and the liquid return line to outdoor unit. You could then fix a leak etc on the outdoor unit. Please advise. Thanks michael
@acservicetechchannel
@acservicetechchannel 6 лет назад
The problem is the reversing valve being powered or not powered as well as having access to the ports for a vacuum afterf fixing the component, thanks
@michaelcostello6991
@michaelcostello6991 6 лет назад
Thank you very much
@ocvasquez04
@ocvasquez04 7 лет назад
Quik question i am a hvac tech at a university in Texas been there for 8 years and i just passed my texas hvac b license where can i get a up to date price book?
@acservicetechchannel
@acservicetechchannel 7 лет назад
Are you talking for hvac equipment and supplies? If so, you would need to set these up with individual vendors and you would either fall into a certain pricing or you would have to agree upon a certain pricing. Usually there are 4 tiers depending on how much you buy. I operate on the premis that is you set me up with good pricing from the get go then you have established a great relationship. If I have to work to build my pricing then I do not like that too much but to some extent they would need to reward those who buy more frequently. If you mean something else just let me know, thnaks!
@petesingh292
@petesingh292 6 лет назад
Is it ok to run the indoor fan while vacuuming the entire system ?
@acservicetechchannel
@acservicetechchannel 6 лет назад
Yes, it would help if there were moisture in the system. Make sure the compressor is not running though. You don't have to run the indoor fan but it certainly helps if you suspect water in the lines, thanks
@alexluna6810
@alexluna6810 5 лет назад
Do we open the manifold gauges?
@acservicetechchannel
@acservicetechchannel 5 лет назад
During the pump down after purging the air out, the handles will remain closed, thanks!
@omarrc9628
@omarrc9628 6 лет назад
and the purpose of performing a pump down, trapping the refrigerant on the outside coil is in lieu of performing a service?? What kind of service?
@acservicetechchannel
@acservicetechchannel 6 лет назад
If you need to replace the evap, lineset, filter drier, or metering device. Most new units come with refrigerant already in the outside unit. It would be like that. You don't want to have to recover it and vacuum that part of the system too if you can just put the refrigerant in that location of the system, thanks
@omarrc9628
@omarrc9628 6 лет назад
gotcha!!
@charlieparker5678
@charlieparker5678 6 лет назад
So after pumping down successfully, you don't have to recover any refrigerant???
@acservicetechchannel
@acservicetechchannel 6 лет назад
If you do it well enough and run the indoor fan while doing it, you have the chance to not have to recover the refrigerant because the pressure in the lines does not rise above 0. You have to keep heat on the refrigerant by running the indoor fan during the process though, thanks
@charlieparker5678
@charlieparker5678 6 лет назад
Thank you for helping out a noob! Awesome.
@jakesmith2984
@jakesmith2984 6 лет назад
AC Service Tech LLC Where does the refrigerant go?
@acservicetechchannel
@acservicetechchannel 6 лет назад
The refrigerant gets pumped into the outdoor condernsor coil as a subcooled liquid. Pump downs are done on standard units but not on microchannel coil units, thanks
@jakesmith2984
@jakesmith2984 6 лет назад
AC Service Tech LLC Ah ok.Great.Thank you for replying!
@ddcws1
@ddcws1 7 лет назад
What do you do if the low pressure switch cuts condenser off before it reaches 0 psig?
@acservicetechchannel
@acservicetechchannel 7 лет назад
Hey David, you are right. You would need to look to check for that first and if you did find a low pressure switch then you would need to turn the power off and jump the 24v low pressure switch wire out with alligator clips or just connect the 24v power wire directly to the contactor instead of going through the switch. Most basic units will not have these unless we are dealing with a specific brand but yes check for that first on the suction line. I just want everyone to be safe whenever possible and also the indoor airflow really helps to get an accurate pressure reading, Thanks David!
@ddcws1
@ddcws1 7 лет назад
acservicetech That actually happened to me. We were relocating the condenser and it shut off around 50 psig I didn’t know what to do so I just recovered the remaining refrigerant. That would be a good video to see. How to either jump it out with alligator clips or straight through contactor. I really enjoyed this video! Thanks Craig!
@acservicetechchannel
@acservicetechchannel 7 лет назад
If the sensor is easy enough to get to then I would just recommend jumping that out but ok I will keep that in mind for the Patreon video, thanks
@dannylee5588
@dannylee5588 6 лет назад
Do you have anything on changing a piston? I believe I have an issue in this area because my Superheat keeps Hunting wont settle down.
@acservicetechchannel
@acservicetechchannel 6 лет назад
Danny, I presently do not, sorry. How many psi is it hunting?
@dannylee5588
@dannylee5588 6 лет назад
At first SH was up to 16.8 then it started to drop. Then it climbed back up only to drop down to 5.7. Ill get you all of the numbers present on the sman this afternoon. I will reply on Patreon.........
@flipurproperty5629
@flipurproperty5629 2 года назад
totally wrong cause all condensers have hp/lp safety valves that prevent high head pressure and one that shuts down the unit when it reaches a lp to protect compressor and system. so using thermostat doesn't do the job as contactor. facts
@acservicetechchannel
@acservicetechchannel 7 лет назад
All of the ACSERVICETECH Playlists- ru-vid.com/show-UCOZR-1IqsAer9wzlvFgb4mAplaylists?view_as=public If you want to support the ACSERVICETECH Channel and receive more HVAC content, check out www.Patreon.com/acservicetech
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