i need to how to guage window/central unit a/c freon with a guage for proper amount?
Answers:
the easest way is to do a temp. split if the system is up and running.. window units should be 25-30 deg. colder supply air vs. return. central unit should be 15-20 deg. if you are thinking about charging yourself.. its a bit more complicated and i might remind you that handling refrigerant without the proper liscensing is punishable with a 10,000. fine and if you dont do it right, you can ruin a comressor.
Other answers:
Are you wondering how to charge your A/C with the proper amount of refrigerant? Somewhere on the condensing unit will have the suggested charge usually in LBS. I am going to assume you have already take the proper steps prior to charging refrigerant. If your Condensing unit is within the manufacturers specified distance of the Evaporator then you can charge it by the manufacturers suggested amount, that will get you close. If its not you will need to either charge it by the super heat method or subcool method, again the manufacturer usually specifies that. If you havent done it before dont do it, you may overcharge it and flood the compressor with refrigerant and then you will have to buy a new compressor.
Are you wondering how to charge your A/C with the proper amount of refrigerant? Somewhere on the condensing unit will have the suggested charge usually in LBS. I am going to assume you have already take the proper steps prior to charging refrigerant. If your Condensing unit is within the manufacturers specified distance of the Evaporator then you can charge it by the manufacturers suggested amount, that will get you close. If its not you will need to either charge it by the super heat method or subcool method, again the manufacturer usually specifies that. If you havent done it before dont do it, you may overcharge it and flood the compressor with refrigerant and then you will have to buy a new compressor.
Do you have a shrader valve? if not, you'd have to install one and then you'd have to recover all the refrigerant. Do you have a recovery unit? If not, call an HVAC tech.