coil temp for r22 split system

[ctct]

what should my evap coil temp be on an 80F 75% humidity day. This is a 5ton goodman split system with a txv. It just doesnt seem to be cooling to capacity. Evap temp is always around 45f. System pressures are HI 250 LO 72, any ideas thanks

[The Viking]

Sorry,
Never had the pleasure to work on a Goodman unit.

But the data you provided looks like if it could be OK.

More interesting thou, what's the Delta T (temperature difference across the indoor unit) and superheat?

Those 2 values will tell us more....

[paul_h]

Air con is designed to be 20K. So say in celcius, if indoor temp is 20C, saturated suction temp on the LP gauge would be 0C, or ~ 400kpa.
Convert that to moon measurements of PSI and Farenhiet.
eg 30C (85F) day, sst should be 10C = 539kpa or 78 PSI.

[ctct]

then I guess it is running properly, The fact that the unit is for a restaurant that has two large exhaust hoods running all day doesn't help either.