Browse Forums Heating, Cooling & Insulation Re: Help with Amp switches for Air conditioners 3Apr 30, 2016 11:44 pm Owner Building at Jimboomba Woods in Logan City Qld. Blog : http://bandlnewhomebuild.blogspot.com H1 thread : viewtopic.php?f=38&t=68283 . Re: Help with Amp switches for Air conditioners 4May 15, 2016 8:44 am Here is a basic rule of thumb to work it out... Kw rating of the air con × 1000 ÷ 3 ÷ 240 7kw × 1000 = 7000 7000 ÷ 3 = 2333 2333 ÷ 240 = 10A (rounded up) This will be the running load of the unit (approx) Most manufacturers specify a minimum fuse/circuit breaker size. In my experience this is usually about 1.5 - 2.5 times the running load. So to be on the safe side 10a × 2.5 = 25amp circuit. (Probably 4mm2 cable or possibly larger but the electrician should work this out) Same calculation for a 3.5kW unit results in a 12.5 amp circuit being required, however there is no such thing as a 12.5 amp circuit, the next size up is 16 amp. This will need 2.5mm2 cable or possibly larger. Hope this helps. Shelly switches require a paid subscription for full access to all features which is ridiulous given the lifespan of a home and if you were to sell it or buy a home with… 2 4517 How do you remove one of these ceiling air con vents? And is it possible to disconnect the duct joined to the vent from inside the house, without going into the roof cavity? 0 5933 Hi all, sorting out the ducted air con for a 350sqm double story house. Does this placement sound reasonable to you? Also, I plan to have 6 zones I think. Living room… 0 0 |