This video is to help new technicians learn the basics of checking the charge on an air conditioner. The EPA requires all persons handling refrigerant to be EPA 608 certified. Please do not attempt to charge a unit if you are not certified or a student working under the supervision of a qualified trainer….(read more)
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Refrigerant charge is an important factor in the proper operation of a condensing unit. If the charge is incorrect, the system may not operate efficiently and may even cause damage to the equipment. The sub-cooling method is a reliable way to check the refrigerant charge of an R-410a condensing unit.
The sub-cooling method involves measuring the temperature difference between the refrigerant leaving the condenser and the refrigerant entering the evaporator. If the difference is greater than the manufacturer’s specifications, then the charge is too low. Conversely, if the difference is less than the manufacturer’s specifications, then the charge is too high.
To begin the sub-cooling method, the condensing unit must be running for at least 30 minutes. The condensing unit should be running at full load and the temperature of the indoor and outdoor air should be stable.
Once the unit has been running for 30 minutes, the technician should measure the temperature of the refrigerant leaving the condenser. This is done with a thermometer or temperature gun. The technician should then measure the temperature of the refrigerant entering the evaporator. This is done with a thermometer or temperature gun as well.
The difference between the two temperatures should be compared to the manufacturer’s specifications. If the difference is greater than the manufacturer’s specifications, then the charge is too low and additional refrigerant should be added. If the difference is less than the manufacturer’s specifications, then the charge is too high and some refrigerant should be removed.
The sub-cooling method is a reliable way to check the refrigerant charge of an R-410a condensing unit. If the charge is incorrect, the system may not operate efficiently and may even cause damage to the equipment. To ensure the system is operating properly, it is important to regularly check the refrigerant charge using the sub-cooling method.
Subcooling txv
Omg you forgot to purge the low side hose …..there goes the system …
Fyi
You always use a scale and you HAVE to wait 20 mins tops for everything to stabilize or you didn’t get an accurate charge.
Good video
That music is so distracting and annoying
Thank you. now I can work on my own unit
Great job!! Thank you!!
Please let me know why you are not using a scale for both, the charging and the reclaiming procedures?
Excellent video. Good job. Thank You.
Hi! Amazing video! Thank you for creating this type of content. I recently installed a new Rheem 16 seer 3.5 ton system (RA1642AJ1NA + RH1T4821STANJA) at home and pressures are low side 140 /High side
305 at a 81F outside temp night here in florida. During the day with 92F outside it was at around 175 on the low side and about 300 to 310 on the high side. Does that mean Am I low in refrigerant? The system is cooling but I feel it takes too long to lower temp inside. Like 1:45 or more to go from 72 to 70. Any advice would be greatly appreciated, thanks in advance.
Hi, as you add r410a to increase subcooling. What happens to the low side pressure and saturation temperature? Do they go up or stay the same? Thanks
I really wish they'd lose the Disco soundtrack. They never play music in a classroom, why do so many YouTube geniuses do it?
what numbers are ok for temp clamp
damn who braze those lines ?????:))))))
If the subcool is 8 and you want 10 you need to recover the refrigerants not charging more ….
Actual Temps on LL, and Saturation Temp. Relation: It get's confusing, but remember this…. Add REF: decrease Sub cooling (Delta, T decreases)
Remove REF: increase Sub cooling, (Delta T, increases).
Also just to get this off my chest. If the Condenser coil, either 1 ton or a flat 50 Ton coil exposed to solar GAIN, "HAS NO RELEVANCE ON HEAD PRESSURE".
If some think this in not true, please argue the topic……. I would love it. Have facts please. Outside air over coil (s). No bells or whistles, just debating possible facts. Thanks. My opinion,……. NO AFFECT! Let's see what you think. Peace…….
Very well Done.
Any reason for No purging?
Burb the air out the lines.
I would love to see everything step by step if he didn’t talk and had something write up to take notes
Is the sub cooling value fixed between 9-15 or does it change from one gas to another and from one air conditioner to another?
thank you
Safety my buddy…gloves!
I thought this was for professionals apparently they had a stand-in for this video
The replies seem to have been erased or hidden.
it would have been helpful if you were using a scale to show how much refrigerant it took to go from 8 to 15. recovering refrigerant should have been done with the unit running and a scale. also use an amp meeter to show how much power is being drawn during this.