Please note, there is no soldering involved in the installation of Room Air-Cond. It will involves only flaring.

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Added on May 16, 2012, 11:46 am
Check it from the label on unit.

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Added on May 16, 2012, 11:49 am
Use "venier" clipper, measure and match it against the standard piping thickness in the market. I am not sure if the "venier" is spell as "venier", but it sounded like that.

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Added on May 16, 2012, 11:55 am
Inverter start saving after the room condition has stabilised and the compressor RPM tunes down and slows down without needing to  start stopping, hence saves energy. To achieve stable room condition, you need approximately 3 hours or less (not 8 hours or more), unless you open and close your door very frequest through put the time. Maintenance of Inverter AC is more expensive because of the refrigerant. Chemical used to wash the coil will be the same. Piping is also more expensive. Depending how is your ussage, inverter can be a good or bad choice. My view is that there is no point getting an inverter AC for living room which only uses AC for 1 hour. Can't save energy.

Copper tubes of course can be welded. What I mean is that under normal circumstances and normal installation, room air conds are just simple plug and play. Also, welding of copper pipes then operates without pre-testing does not really garuantee the quality of the weld.

BTW, please enlighten me on how is the indoor unit twisted?

Eh... I thing it is not the correct way. It did need a propane torch to heat up the 2 copper pipe joint. But not melt it. A solder wire lead is need to melt and joint up the copper pipe. And you need a flux to clean up the joint side.

Never see ppl using ultrasonic before.  For copper welding, the old type is using something like copper lead. Blaze the copper joint till red and melt the copper lead to the joint. I can't remember the name as quite sometime I never done it.

New way just heat it up and use solder lead. Both need flux and sandpaper to be clean well.