Charging 1234yf

Bill Owner/Technician Jackson, Michigan Posted   Latest  

When using my new 1234yf machine to recharge a system the machine asks do you want to charge with Low Side, High Side, or Both Low and High. I am unfamiliar with this question from my other A/C machine and wonder what is the best choice?? Is there a advantage to picking any of the three ? 

0
Pedro Owner/Technician
Cayey, Puerto Rico
Pedro Default
   

Hope this helps you, buddy! Mr. G Jerry Truglia from TST youtu​.​be/l71H_J9fi5E

+2 Default Ð Bounty Awarded
G Educator
Mahopac, New York
G Default
 

Pedro thanks for posting the answer...

+2 Default Ð Bounty Awarded
Pedro Owner/Technician
Cayey, Puerto Rico
Pedro Default
 

Greetings and Blessings, Jerry✌🙏📈📊💻🔧🔩🚘🚗. I saw the video a few days ago and I told myself; "Here is the answer, to the question of our colleague". Thanks Jerry✌✌✌

0 Default Ð Bounty Awarded
G Educator
Mahopac, New York
G Default
 

Pedro thanks since I did not see the request. Have a great day

0 Default Ð Bounty Awarded
Bill Owner/Technician
Jackson, Michigan
Bill Default
 

Thanks

0 Default Ð Bounty Awarded
Jim Curriculum Developer
Frederick, Maryland
Jim Default
 

I always charge through the high side with liquid. The charge time is faster and I have yet to have a charge stop and require starting the vehicle. The most important step, depending on the machine, is the routine with the hoses at the end of the charge. If you have liquid charged, the volume of refrigerant leaving the storage vessel is known. There may still be liquid in the high side line. By…

0 Default Ð Bounty Awarded
Robert Owner
Kennett Square, Pennsylvania
Robert Default
 

Hello Bill, Robinair Tech Support states that OE recommendations should be followed on this if available. In a case where OE doesn't indicate, I suggest "both sides" to minimize time . . .

0 Default Ð Bounty Awarded
G Educator
Mahopac, New York
G Default
 

Bob I would agree with you that charging both does minimize the charge time but when it's cold... as it was when we were charging the vehicle the low side is my choice so there is less chance of causing a compressor problem.

0 Default Ð Bounty Awarded
Bill Owner/Technician
Jackson, Michigan
Bill Default
 

Jerry - Less chance of causing a compressor problem? What type of problem are you referring to?

0 Default Ð Bounty Awarded
G Educator
Mahopac, New York
G Default
 

Bill- Compressor damage due to liquid aka hydrostatic lock.

0 Default Ð Bounty Awarded
Robert Owner
Kennett Square, Pennsylvania
Robert Default
   

"G", Thank you for your thoughts. Using a RRR machine (engine not running), hydro-lock should not occur. In that oh so rare instance where the system will not accept the entire charge, close the high side service valve, start the engine, and allow the compressor to pull in the remainder of the charge (like the pre-RRR days), and hydro-lock again should not be an issue . . . Thanks again, "G"

+1 Default Ð Bounty Awarded
G Educator
Mahopac, New York
G Default
 

Bob your correct but most of the newer AC machines do not have a valve to close on the machine. The connect at the end of the hose can be used but if the tech forgets to turn it off it can become a problem. Where I live in NY most tech only perform AC service a few months of the year. From what I have seen over the years teaching AC they forget important steps on AC service. Another problem I…

0 Default Ð Bounty Awarded
Robert Owner
Kennett Square, Pennsylvania
Robert Default
 

"G", I agree RE the refrigerant in the AC service hoses. I stress the fact that the two hoses account for roughly four (4) ounces of the refrigerant charge and not 'compensating hoses" may impact AC operation.

0 Default Ð Bounty Awarded
Mike Diagnostician
Toronto, Ontario
Mike Default
 

I was taught to always charge the system via high side to minimize risk of Liquid refrigerant entering and damaging the compressor.

+1 Default Ð Bounty Awarded