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Collie
12-03-2010, 11:11 PM
Hi, bit of a boring & stupid question for you guys. Can anyone tell me why some manufacturers employ a system of pre-expansion in the outdoor unit of their split air conditioning units? I can only assume that its more efficient than carrying out the expansion at the indoor unit? thanks

Brian_UK
13-03-2010, 12:06 AM
It keeps the high pressures all in one place.

Thermatech
13-03-2010, 09:56 AM
A large segment of global sales of split systems is for domestic application & customer expectation for low noise level.

Pre expansion at outdoor unit helps reduce refrigerant noise at the indoor unit in cooling mode.

I think you may find that the total refrigerant charge for the system is also reduced when using outdoor unit pre expansion.

Collie
14-03-2010, 06:10 PM
Thanks Thermatech, your solving all my problems HAha