I am a former electrician, though not certificated any more. Nevertheless, I still do my own electrical work at home. I am considering air-conditioning and would like to install the power supply to the outside wall, for a single Mitsubishi MXZ-2F53VF condenser unit with 2 internal (cooling) units. But the air-con companies I've spoken to cannot seem to distinguish between cooling capacity (5.3kW) and electrical input, which is fractional compared to the cooling capacity. They say it will need a separate 20 Amp supply, whereas I cannot see why I cannot feed it from my ring main, via a suitable isolating switch. And they talk about a rotary isolator, which seems a bit antiquated and unnecessary to me. Does anyone here have experience of this, particularly whether the unit can be spurred of the ring main?
Domestic Aircon power supply
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It seems sensible, that it should be on its own 20amp supply, to cover the startup current. The rotary isolator is normally fitted, and adjacent to the outdoor unit to allow it to be isolated to work on.
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Inverter drives have reduced the start load, but until you know the start load, there is no answer.
It's all a bit woolly, but the manual says the max current is 12.2 Amps.
I understand the need for an isolator, just cannot understand why it needs to be a rotary isolator.
You wouldn't want that sort of load, constantly loading your ring.
The rotary isolator, is a grey, plastic cased unit, with a bright red knob, and a clear yellow on/off markings, beloved of AC engineers.
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