Electrical Connections for Domestic Air Con Unit

Can we have some pics of the equipment ???????

 

I have never done a domestic install only commercial industrial ........... Normally the feed comes direct from the CU to an outside unit into IP rated rotary isolator then back feeds into the indoor unit via the connections in the compressor, then there needs to be a DP isolator installed next to the indoor aircon for isolation purposes. Now you need to take into account the kick back on the compressor this 3 to 4 times the amount of normal current draw so you will need an MCB type C at least. If it is one of the ready made up units then follow the instructions included

 

You need a proper installer for that. The units are pre gassed to a certain pipe run if you get any water into the system it will be well and truly fooked

 

I have done a few installs but never plugged one in As you say above yes I would install a dedicated feed ...... But others opinions may differ, but that is the way I would do it

 

Alarm bells rang when I see the max current as you stated as 4A which is in fact 4.4KW

That's 19 Amperes on full chat!

This will cause an in-balance on your ring final no too mention a poor design on the decision of your, electrician.

As you state:

Max load is 4.4amps so I have agreed with my electrician to take the connection via an internal fused spur from one of the ring main sockets.

Are you doing this work or is this Electrician doing it as if you have employed him, you needn't be in here stating what is going to be happening in this amount of detail

Something s not right here at all. . . . .

My design would be a type C breaker from the board via rotary Isolator and from there SY flex to the compressor

Heating Capacity (kW) (nominal)4 (1.8 - 5.5)
Cooling Capacity (kW) (nominal)3.5 (1.4 - 4)
Heating Capacity (kW) (UK)3.32 (1.5 - 4.57)
Cooling Capacity (kW) (UK)3.47 (1.38 - 3.97

This work is also notifyable to building control, but like a lot of things now do what you want, but you cannot say We told you so

Si

 

Are you sure you guys read it correctly? I read it as starting current 4.4A, running current 4.4A with a max current of 8.5A. Or is it me?

 

there are 2 tables (indoor and outdoor) where they state the fuse rating is 6a and 10a for each device.

 

Might have to retract some of my last post owing to the other table,

Separate supply still for the compressor 8.5A running current which is still OTT for a ring final IMHO and it seems the internal unit is fed form this as well, so it still would have to go on a dedicated supply.

 

Damian,
If i understand correctly, the unit needs a 16 amp supply. This should be a dedicated circuit from the consumer unit purely for this, and this alone.
As for the amount of work involved this will really depend on the amount of work involved to get the cable installed and your existing installation (and if its up to an additional RCD circuit).
Why not get a few quotes in from approved electricians and go from there.

 

that would still need its own supply. 2kw is the best practice limit (just over 8 amps) to be connected via a plug. there are things we all use around and over this on a daily basis, although its usually in short bursts (like a kettle)

 

Don't forget the kick back on the compressor this can be 3 to 4 times the running current you could be doing some carpet treading resetting the MCB on your ring main. Still agree with the above posts it needs to be a dedicated supply.

 

The indoor unit is fed from the outdoor unit fats

 

Good point Flat

 

Each with own supply from the CU with rotary isolator.

3 units done earlier this year.:



One of the dining room units: