crazy install or did people use to do this?

[paul_h]

I went to a daikin system that trips the c/b on hot days.
It has two outdoor units (RY50GV1A), but only one controller.
I poked my head in the roof space, but couldn't get to the unit (low ceiling, sheet metal roof, roofspace full of ducts. Anyway, the pipes from both outdoors are just welded together and go into one big indoor.
Never seen that before.
Also I have no idea who wired the power to the indoor, it's a real mess as they just used 2+E, meaning that the signal wire is the earth cable.
Also one unit is 2.5mm interconnect, the other unit has 1mm interconnect

And as far as I can tell, they used only the active from one outdoor, and then the neutral from the other, to power the indoor.

Also the mains is only 2.5mm cable from a 20A c/b. So it's not surprising it trips when each unit is rated at 11.8A each, and it's powering a bigger indoor/fan unit anyway.

I always thought the the cowboys couldn't get daikins here, as they are not sold at retailers, only direct. But this is one of the worst jobs I've ever seen.

I'm leaving it as it is, and just getting a sparkie to upgrade the c/b to 32a, and the wiring to 4mm.