How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Airheatman Your Own Question

Airheatman
Airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 4567
Experience:  Furnace, A/C and heat pump specialist.
16514686
Type Your HVAC Question Here...
Airheatman is online now
A new question is answered every 9 seconds

Bought a 2.5 ton R22 Dry A/C Unit, I was told but cant confrim

Resolved Question:

Bought a 2.5 ton R22 Dry A/C Unit, I was told but can't confrim that that all New Condensors are built for R 410 or some other R factor but the way they get around the R22
sales is by sneding them dry this way it can still be used for R22.

MY Question is can someone confrim this for me or better yet give me the right information.
And last but not lest do they put oil in the system already in a dry unit other than Nitrgen.

And if they don't how would I add, put oil into the compressor? and do I evacuate the system first then add oil? Or do I do it before or after?
Thanks
Tom
Submitted: 1 year ago.
Category: HVAC
Expert:  Airheatman replied 1 year ago.

Hello.My name is XXXXX XXXXX I will do my best to help.Troubleshooting often requires meters and test equipment.Let's get started and see what we can do! The unit is a dry unit. It has a small amount of nitrogen which you will release before pulling into a vacuum and charging. The compressor is already charged with oil.You will lose none of the oil in process of releasing the small amount of nitrogen. You will weld the unit in, release the nitrogen , pull a vacuum and then weigh in virgin R22 as per chart in unit.

Customer: replied 1 year ago.

Thanks I was not sure if the unit had a oil in it since they said dry charge.


I understand what you said about brazing first then releasing the charge and pulling a vaccum.


 


But their is two things I'm not to sure about. one Don't I have to take out the sharder valve seats from the compressor first before I braze or I can damage them? Second since I need to put in a new orfice size in my evaporator .71 because I have a 2.5 ton unit and a 3 ton A- Coil, is there going to be a problem once I release the nitrogen out of the system? I have to open up the old system to put in the new ofrice and install a new liquid line dryer. I'm concerned about damage to the high side and low side valves on the condensor. Or do I just leave the nitrogen in the compressor braze everything and then release and vacuum.


If you know of any other way to do this with the right tools and equipment please let me know.


Such as a core removal tool etc, etc.


 


Another question if I didn't have to add these extra componets, do hvac techs add nitrogen to the system then braze to prevent flaking inside and possible damage to the system.


 


Please answer my question in the order I presented them to you so that I may understand.


I have a very strong electrical back ground but


only a limted certification in hvac up to 2 ton units that I worked on and only when the need arises.


Thank You


Tom


 

Expert:  Airheatman replied 1 year ago.
1. You will first recover any refrigerant in old system if it still has freon in it.
2.You will connect gauges to new unit,open valves on new unit, release nitrogen to the atmosphere.
3. Disconnect gauges and remove valve stems with a core remover.
4.Go ahead and replace orifice in coil at this time while system is open.
5.Weld in new unit and filter drier.
6.Re install the valve stems.
7.Pull system into vacuum
8.Add refrigerant.
As for the flaking. most manufactures recommend running nitrogen through system while welding (About 3 to 5 psig. Personally I usually just weld, then before replacing valves, purge good with nitrogen .
Airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 4567
Experience: Furnace, A/C and heat pump specialist.
Airheatman and 6 other HVAC Specialists are ready to help you
Customer: replied 1 year ago.

Thanks I forgot to mention that I did recover the


R22 in a recovery unit and pulled a vaccum to about 10 Hg,.. since I did that I will follow the above procedure you gave me.


You have answered all my questions and I feel confident I can continue with what I started and finnish.


Thank You


Tom


Ps. Once I add xtra $$ to my account I will add it to yours as I know you only get a portion of this fee for your services..


 

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
< Last | Next >
  • You did one super job of explaining to me everything there is to know about this fridge. I'm looking forward to asking you questions in the future. Jimmy Bagley, IA
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
 
 
 

Meet The Experts:

 
 
 
  • gotoman for ac

    HVAC Technician

    Satisfied Customers:

    4657
    51 years of experience install design and repair of all makes and models of AC
< Last | Next >
  • http://ww2.justanswer.com/uploads/SE/ServiceTechRus/2012-6-7_2119_056.64x64.JPG gotoman for ac's Avatar

    gotoman for ac

    HVAC Technician

    Satisfied Customers:

    4657
    51 years of experience install design and repair of all makes and models of AC
  • http://ww2.justanswer.com/uploads/AL/alumalite/2012-5-10_234018_shutterstock506249951forJA500.64x64.jpg Phil's Avatar

    Phil

    Mechanical Engineer

    Satisfied Customers:

    3888
    Retired HVAC/ Electrical & Boiler contractor. Industrial
  • http://ww2.justanswer.com/uploads/skibum0101/2008-12-16_015819_just_answer.jpg Rick Mather's Avatar

    Rick Mather

    HVAC Technician

    Satisfied Customers:

    3132
    35 years experience, HVAC
  • http://ww2.justanswer.com/uploads/RY/Rygis20/2011-5-7_3143_DSC5324.64x64.JPG Matthew's Avatar

    Matthew

    HVAC Technician

    Satisfied Customers:

    1994
    14 years experience in the HVAC field of service, installation, Manual J & D calculations
  • http://ww2.justanswer.com/uploads/KE/kentguidry/2011-9-26_214316_0059.64x64.jpg Kenton Guidry's Avatar

    Kenton Guidry

    HVAC Technician

    Satisfied Customers:

    962
    12 years install/service experience.
  • http://ww2.justanswer.com/uploads/solarman1947/2009-12-13_223915_phpkKBcXq_c2PM.jpg Rick Ridley's Avatar

    Rick Ridley

    UK Heating Engineer

    Satisfied Customers:

    871
    Retired But have had 30 years on the tools, Ex CORGI
  • http://ww2.justanswer.com/uploads/Ironheadfan/2009-12-18_222416_pump_005.jpg Tom's Avatar

    Tom

    HVAC Technician

    Satisfied Customers:

    770
    16+yrs HVAC/R service. Residential Commerical Industrial