How to find out the amount of refrigerant charge

[Dunno]

Is there any books to recommend for charging of refrigerant in the industry for aircon, normally they drain everything and charge in or they base on experience to gauge the amount of refrigerant to charge in?

[martinw58]

aircon units are charged to manufacurs recomended amount depending on the lenth of the expansion line ( liquid line )

[Mark II]

Great Nickname Mate... It suits you

[Toosh]

Great Nickname Mate... It suits you

Thanks for the laugh

[lzenglish]

When you say aircon unit, do you mean Air Conditioning unit? If so, is it a package unit, or split system? There are many ways to charge either type. You can evacuate, and charge to the data plate specs., which would be the most accurate. But if you just want to add Refrigerant, you can use the sight glass,(if it has one), or simply use the pressure temp. relationship readings on your gages. I have charged units just by the feel of the suction line at the compressor, and the feel of the condensing air. These are just ball park ways though. Check the Refrigeration Service Engineers Society web site for books.

Take Care

[nike123]

http://www.mediafire.com/?wzgtwmyhzty

[El Padre]

Split systems are critically charged, if you look on the data label on the outdoor unit you will see the charge that the unit came with, depending on the manufacturer this charge could enable a 7.5 up to maybe 30metre pipe run between the units before any additional charge is required.

The manufacturer normally supplies data for the additional charge if required, i.e. add 30g per metre.

Cheers

[Scramjetman]

Best way is as was mentioned earlier, check the name plate charge weight and recover the refrigerant and weighed it back in with a good set of digital scales.

When doing splits, check your pipe run length. The split supplier has tech specs on additional refrigerant per metre of pipe above a certain length up to a maximum limit. Don't forget to add this to the base charge.