I WANT IT COLD! Charging 410A by superheat and subcooling
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- Опубликовано: 30 май 2024
- In this video I responded to a customer that moved to Central Florida from up north and thought he was having an issue because his system wouldn't cool down to 65 degrees in 95 degree with 100% humidity weather. I show you how to set the charge when it's really cold with low humidity inside the home using superheat and subcooling. #marioncounty #florida #acrepair #410a #superheat #subcool #accompany @VictorofHVAC
How cold is he trying to keep the inside? Someone told me that your central unit can only cool 10 to 15 degrees below the outside temp. I dont know how true this holds. I prefer window units i can get my bedroom about 68 degrees on a 100 degree day. But my bedroom is on the north side. He needs a freeze protector stat on the evap coil. Its wired in with the 24 volt contactor in the outdoor unit so if it detects freezeing conditions on the evaporator it will shut off the condensor blower will run till frost melts, and outdoor unit will restart again. I worked on a trane unit that was set up as a low ambient unit to cool a server room, and it had a freeze protect device on the evap coil.
So glad I'm out of the residential field I'd be the one to go back out after someone charged to gas a unit up and I go back to remove a dirty filter or tell them their coil is dirty.
checking these pressures and temperatures at the compound gauge,. first when refrigerant was added and sub cooling went up, but the super heat stayed the same, including the low suction pressure did not increased meaning you have a liquid line restriction , or txv problem,
You will go back .... to adress air flow
looks like an airflow issue possible low heat load, you will be returning to address ice up coil good luck
That is a little low as well. Txv? You’re lsat is like 3 degrees above outdoor. Should be 15 minimum 8 degrees subcool. You’re VSAT will go up and low side. The indoor temp of 78 will not effect that maybe 65-68 degrees indoor would
Low load ,charge is low as well I would bring sub cooling to specifications if specs are not listed bring sub cooling to 7-10 degrees .
Interesting how MVAC testing is so different. In MVAC, the manifold gauge tells you everything. Superheat and sub cooling isn't calculated. Charts are very common showing operating pressures at different temps and humidity. As well as vent temp.
Long time no see Victor. Good to see you again man!
Do most techs use this system of superheat and subcooling?
To address a low VSAT (Vapor Saturation Temperature) reading, which is an indication of the temperature at which refrigerant evaporates in the evaporator coil, you should consider the following potential causes and corrective actions:
Very good video. Thank you.
Hey that Guy looks familiar!
Did you measure indoor airflow with a manometer? Kind of looked like low indoor airflow to me.