[jeffrey_benjamin]

Hi to all I've got me a problem here where the suction pressure on this Carrier A/C 30 ton system reads 50 PSIG. Three compressors have been replaced already. The evaporator coil has been cleaned. Any suggestions ?

[John @ Fischers]

Whats the high side PSI ?

[jeffrey_benjamin]

Originally Posted by John @ Fischers

Whats the high side PSI ?

hi thanks for your responce hi side preaaure is 300 psi. condenser is clean & fans are ok.

[John @ Fischers]

ok, to clarify. Is this a 30 TON or a 3 Ton A/C Unit ?

[jeffrey_benjamin]

Originally Posted by John @ Fischers

ok, to clarify. Is this a 30 TON or a 3 Ton A/C Unit ?

carrier 30 ton A/c system

[John @ Fischers]

That high side psi is kinda high for a 50 psi suction pressure. What was the original problems that cause the first compressor to be changed, and is this a roof top unit?

[herman stoehr]

sounds like you have a restriction in the unit somewhere, i would see if there are any liquid line dryer thats plugged

[hvac_hillbilly]

if this a 30 ton ac instead of 2.5 ton 30'000 btu ac i think i would look at the txv at the evaporator coil this sounds like it is not opening correctly make sure its sensing bulb has not come loose from the suction line please let us know what you are cooling with 30 tons of ac

[Fastlanedan]

A model # and serial # would help.

You most likely has a restriction on the orifice, it is located between the header and the distributor.

[hvac_hillbilly]

Originally Posted by Fastlanedan

A model # and serial # would help.

You most likely has a restriction on the orifice, it is located between the header and the distributor.

well if it has an orfice i doubt its a 30 ton unit either
it could have a txv or even cap tubes but im guessing restriction some where too