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Originally Posted by Stohr They always say that when it is a 100 degrees out. yep... people aren't too bad during heating season but seem to loose their sanity during cooling season.
Possible dirt impacted in between the coils, check your condenser discharge air along the circumference of the coil. If you have sections where discharge air temp is greater that's where the dirt is and the coil is dirty. Next: change the the drier, yes carrier rtu's do sometimes allow too much out door air in to system.
Originally Posted by Aalmaraz How do you know it was overcharged? Are we positive the condenser is clean? Did you recover and weigh it? Yes, I cleaned the condenser after I saw the discharge pressure was like 350 and suction was above 100
Originally Posted by Notasupertech Just a question,,,, what is the refrigerant you are working with on this system? R22
Just a thought how much O.A. is coming in
How do you know it was overcharged? Are we positive the condenser is clean? Did you recover and weigh it?
Looks pretty good but I question the Back pressure a little with an 81* return..... If the condenser is a little dirty and a 285 head.... although that looks good and the Compression ratio looks pretty good, it could fool you if ya had a little dirt.... The compression ratio that is... SC and SH look good..... But would love to know the DSH, the 3rd piece in the puzzle You could have a slightly week pump and sized on the edge..... I would check it and pump it down "if" possible.
Originally Posted by alex13177 That's what I told the owner that the system is running at max capacity. She doesn't believe me, said it used to run cooler inside. It is almost 100*F outside and the store front is west facing with all window. When I came to check the system, it was overcharge and cut off on high pressure. It was 106*F outside. Is this a Carrier RTU? sound like one of mine...lol. but i have to agree this unit is balls out doing what it can.
Just a question,,,, what is the refrigerant you are working with on this system?
They always say that when it is a 100 degrees out.
Originally Posted by git-r-dun No, it actually appears to be proper. TXV appears wide open but under a high heat load. A closed txv would give you a low suction pressure, high sub cooling, high superheat with a low delta T. That's what I told the owner that the system is running at max capacity. She doesn't believe me, said it used to run cooler inside. It is almost 100*F outside and the store front is west facing with all window. When I came to check the system, it was overcharge and cut off on high pressure. It was 106*F outside.
No, it actually appears to be proper. TXV appears wide open but under a high heat load. A closed txv would give you a low suction pressure, high sub cooling, high superheat with a low delta T.
Is this normal operation? Rooftop package unit with TXV Discharge pressure 285 Suction pressure 70 Sub cool 11 Superheat 30 Suction line temp 70* Air across coil is 81* return and 61* supply Also it was 96*F on the roof Is the TXV stuck closed?
Is this normal operation?
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