Originally Posted by
The Viking
As you specifically named VRV, I assume that we are talking Daikin...
When it comes to designing VRV systems, the guys at Daikin is really helpful, so will the other manufacturers be if you are talking about VRF (But bear in mind that non of them accept design responsibility!!!).
They will spec their VRV/VRF systems for you, including pipe sizes and schematic pipe layout.
When it comes to the drawings, follow the advice above and hand draw on existing printouts but, instead of giving it back to the customer, send it to a professional draughts man (preferable with the original CAD file). It will cost £400-£1k depending on the job but is well worth it. (If you have problems finding one, send me a PM and I will give you the name of the lady we used to use)
Finally,
Make sure that you are covering yourself, I know of several guys that gone down the pan over their first larger VRV/VRF install.
Good luck.