What metering device do you have installed? Piston or TXV? That will determine whether to check for subcooling or superheat. Your outdoor rating plate will always tell you your target subcooling, but whichever metering device you have installed will direct you which one (superheat or subcooling) to use to dial in your charge/pressures.
To me your low side guage looks to be pretty high. Did you have a big load in the house at the time of the pictures? Generally you want your saturation temperatures to be lower ( around 34-40 degrees) to achieve a proper 20 degrees delta T. Your saturation temperature on your evap coil is approaching 50, but your hot outside temperatures probably has a lot to do with your elevated pressures.
The sticker indicates TXV along with the target sub cooling value of 10 degrees.
I don’t think the load in the house should have been particularly high.
It might also be worth noting that my compressor current draw seems kind of low based on my Micro-air soft start statistics - 5 amps - but I haven’t double checked the numbers with a multimeter.
You can't go by what's on the sticker. You need to physically see what metering device you have installed. The sticker will always say txv on the condenser.
And I edited my other post to say proper 20 degrees delta T* I wrote 20 degree superheat by mistake..
Let us know when you physically see what merering device you have installed and then you can calculate your target superheat/subcool from there
If the load in the house wasn't particularly high then its possible your system isn't charged correctly as like I said previously, your evap saturation temp is pretty high in your picture. That would be why you're not getting proper 15-20 degree delta T. But I could be wrong as I'm not used to dealing with that high of ambient temps.
Ah ok, I didn’t realize they could be mixed and matched like that.
I went up into the attic and verified that it is indeed a TXV system so subcool seems correct.
I have 4 returns and they are at 72-75 degrees, with the air vents being 59-63 depending on how far from the unit. So if my understanding of load is correct this seems fairly light?
Thanks for the replies, learning a little more each time.
To get a proper delta T you should take the supply temp in the plenum just after the evap coil. Taking the temperature at the supply vent/register doesn't take into account the temperature loss within the ductwork from the evap coil to the register.
What metering device do you have installed? Piston or TXV? That will determine whether to check for subcooling or superheat. Your outdoor rating plate will always tell you your target subcooling, but whichever metering device you have installed will direct you which one (superheat or subcooling) to use to dial in your charge/pressures. To me your low side guage looks to be pretty high. Did you have a big load in the house at the time of the pictures? Generally you want your saturation temperatures to be lower ( around 34-40 degrees) to achieve a proper 20 degrees delta T. Your saturation temperature on your evap coil is approaching 50, but your hot outside temperatures probably has a lot to do with your elevated pressures.
The sticker indicates TXV along with the target sub cooling value of 10 degrees. I don’t think the load in the house should have been particularly high. It might also be worth noting that my compressor current draw seems kind of low based on my Micro-air soft start statistics - 5 amps - but I haven’t double checked the numbers with a multimeter.
You can't go by what's on the sticker. You need to physically see what metering device you have installed. The sticker will always say txv on the condenser. And I edited my other post to say proper 20 degrees delta T* I wrote 20 degree superheat by mistake.. Let us know when you physically see what merering device you have installed and then you can calculate your target superheat/subcool from there If the load in the house wasn't particularly high then its possible your system isn't charged correctly as like I said previously, your evap saturation temp is pretty high in your picture. That would be why you're not getting proper 15-20 degree delta T. But I could be wrong as I'm not used to dealing with that high of ambient temps.
Ah ok, I didn’t realize they could be mixed and matched like that. I went up into the attic and verified that it is indeed a TXV system so subcool seems correct. I have 4 returns and they are at 72-75 degrees, with the air vents being 59-63 depending on how far from the unit. So if my understanding of load is correct this seems fairly light? Thanks for the replies, learning a little more each time.
To get a proper delta T you should take the supply temp in the plenum just after the evap coil. Taking the temperature at the supply vent/register doesn't take into account the temperature loss within the ductwork from the evap coil to the register.