Having a small sun-room/extension on the back of my house to increase size
of dining room. I've been mulling over the idea of adding an air-con unit
and decided to go ahead with it.
I've already pulled in a couple of 2.5mm cables to form a new ring main in
the extension ready for the sparky - though I only expect to have maybe 3
double sockets in there.
Any reason why the air-con unit can't go on there too? I'd expect it will be
no more than 3.5Kw (outdoor unit apparently should be fused at 16A) so the
total loading should be fine. However, most switched/fused outlets are only
rated at 13A.
Most of the ac units I have wired up in conservatories a 3kW or less and run
fine off the ring. I your unit is 3.5kW you will need a seperate 2.5 cable
back to the CU on it's own 16 amp MCB with a 20 amp switch in the
On Sun, 30 Mar 2008 19:27:08 +0000, Harry Stottle wrote:
A further point though: Is 3.5kW referring to the electrical input or the
cooling output (which counter-intuitively can be substantially higher)?
We have an impressive air-con unit here which uses about 3kW to provide
5.3kW cooling (and 8.3kW heating on the outside) and way would be over
the top to cool a single room without significant heat sources.
No but is a lot of duff info mixed up in this thread.
My top ones are:-
1. Oh it'll be okay (it's close enough).
2. Anyone who thinks a 'real' (true) measured quality can increase
magically - you are not going to get 3.5kW of anything
(heat/cooling/light/sound/movement) from about 6A of 230v mains.
- like my chinese computer speakers that say 360w music power on the box -
the ones powered by a 9v wall plug labelled 1W (I know, they'll claim peak
everything it still isn't close).
There is nothing magic about it. No one said the 6 amps from the 230V mains
will supply all the 3.5kW heating/cooling.
Pure physics. And as Scotty said "ye cannot change the laws of physics"
The OP may get back with the specs of his unit and then we will know what he
He's not coming back, is he?
16a fuse does indeed sound like about 3.5Kw - and yes, I do know what
Watt, Joule, Coulomb and Ampere are - but typically heat pumps have a
darn great motor in them so I'd expect a surge current.
I've no idea whether the 3.5Kw is electricity in or heat in. I suspect
it isn't heat out.
Thanks for the replies all.
Sorry - been away for a few days and hadn't expected to spark (pardon pun)
such a debate! Still haven't got the precise spec/model but its from
Mitsubishi http://www.mitsubishi-aircon.co.uk /
If its a 3.5kw as I think the guy said, it will *probably* be MSZ-HC35VAB or
products/m series/r410a wall mounted/classic inverter heat pump/3.5kw
products/m series/r410a wall mounted/inverter heat pump/3.5kw
As soon as I confirm from the quote, I'll post up.
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