mate It should be SRA160 I am also building Lincoln 35 and have following in my contract
Reverse Cycle Ducted Air Conditioning Provide an Actron SRA160 - 16.4kw (net) reverse cycle ducted air conditioning system to include - * 3 No. zones
SRA190 is 18.2kw
Then my contract has an error as it definitely says SRA190 - I'll check what it the actual unit is this afternoon.
Finally checked my air-co unit, and I have an SRA173 - not an SRA190 as stated in the contract!
Thats no good!!! Could that be part of the reason why that it is loud as well?