you guys may think this is funny but ill tell you there are
probably 98% of all residential techs that do not know how to charge txv systems. or for that matter orfices. most think they just got to get a 60 or 70 lb suction and thats it. they donot understand subcooling and superheat which if you dont you do not understand the refrigerant process.
i find systems overcharged all the time. they think when a compressor fails it just failed and theres really not a reason. just install a new one and go on.
I agree with airworx, too many techs who just flat out do not know. I once got into an argument with a tech who had been doing res/commercial work for 30 years about the existence of SH and SC.
Just a few questions:
1.) What were your system pressures before adding refrigerant?
2.) Did you take Superheat and Subcooling measurements?
3.) No airflow restriction?(plugged filter, dirty evaporator coil, blower motor running at correct speed)
4.) What made you think the system was low on charge?
5.) What were the ambient temperatures and indoor wetbulb temperatures?
6.) Last but not least, HOW MUCH REFRIGERANT DID YOU ADD?
Please clear up these questions and possibly get us the make/model numbers of the equipment you are working on so we can TRY to help.