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Old 15-03-2015, 09:33 PM   #5533
Join Date: Nov 2008
Posts: 1,690
I downgrade from System 3 to System 2 also can and my living room changed to 13K BTU also pipeline same as the 10K BTU one.

So I think should not be an issue.
Only 18k can't use 24k btu FCU.
10k & 13k to be the same.

But in my experience of older design 12k for gas pipe size from 12mm & 6mm, so cannot be use to 9k for 9mm & 6mm pipe size.

Last edited by kimsim; 15-03-2015 at 09:49 PM..
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