R410a High Superheat - http://www.hvacmechanic.com/ Forums
Original message
| timdecker
 |  "R410a High Superheat"
, posted Tue 2 Sep 18:59  
Here are my temps, WB indoor 78*F, DB Outside 95*F, What should my superheat be and does anyone have a chart to determine correct superheat?
I have a R-410a System 5 ton, Suction pressure is 81 psig, suction line temp is 65*F.
I know that 81 psig is equal to about 22* F, which makes the superheat 43*F. Does this sound ok? Also the liquid line temp is 102*F and the pressure is 230 psig(79*F from chart) which tells me i have 23*F of subcooling. I believe i have a TXV as an expansion device. Do I need to add more refrigerant? P.s I just had my house inspected before I get ready to sell it so there are no suprises later, its 18 months old, inspector said wet bulb temp should have a greater temp difference he got 77.6 return air temp and 61.7 supply temp both wet bulb. Thanks. God Bless America!
Greetings from Houston TX the AC capitol of the world!
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Replies:
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| theduke03
| "Re(1):R410a High Superheat" , posted Tue 2 Sep 20:00:
That is negative 23 degrees subcooling(-23). If the gages are accurate then you have a seriously low charge. Something is screwy about those readings.
"My dad was the most feared furnace fighter in Northern Indiana."
[this message was edited by theduke03 on Tue 2 Sep 20:18] |
| Jojo98
| "Re(1):R410a High Superheat" , posted Tue 2 Sep 19:56:
TXV systems measure proper charge by subcooling. You will have to find out what the required subcooling is for you particular unit. Check on the unit data plate for starters. Usually its anywhere between 10 and 20 deg, 23 deg's is probably too high. Add refrigerant to raise subcooling, remove refrigerant to lower subcooling. I have never heard of a minimal wet bulb temp. sounds kinda kookey.
[this message was edited by Jojo98 on Tue 2 Sep 20:01] |
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