[aircooled53]

I have a less than 1 yr old carrier 25HPA536A310. Installed last August. Stopped cooling effectively. Tech came out his notes are: and "Added 3lb 10 oz of R-410a to bring subcool to speed. 11 deg., press 250/48 w/87 deg. sat temp and 74 deg. LL temp. No indication of overheat to TXV buld. TXV is only possibility. 7 deg. split." I know nothing about this, but should this much R-410a need to be added to a new system? It cooled fine last Aug-Sept when installed. I've read other posts here where TXV replacement was more than common. Any ideas what could be wrong? Faulty installation? My warrenty is up in August so I do not want this to be a hunt and peck every month until I'm out of warranty. Any help or direction appreciated.

That is NOT correct pressures for R410a system.

 

[aircooled53]

I really appreciate all the replies. A new tech came out. Said first tech had added refrigerant to do diagnostics. He replaced HVX, emptied system and refilled. Said should be good to go. Did not give me new pressure readings though. Seems to be cooling now. I'll be back if any more problems. Thanks again.

I would ask what the pressure where /temps and T.D. after charge. You are owner of system..Required info..:.02: