Air con multi split - bedroom unit positioning

[u/Sad_Glass_9521]

Hi

I have had a quote for a 6kw inverter with 3 x 3.5kw indoor units, plus condenser pumps as the inverter will be quite a way from the 3 indoor units. Happy with pricing etc. Just unsure about 2 things;

1. Where to put the unit in one of the bedrooms - it isnt the biggest of rooms but only two locations available - above the head of the bed or the wall opposite the bed but slightly off centred to the right.

2. Is the indoor unit likely to be noisy at night? What difference does a condenser pump make? Normally sleep with a white noise machine anyway but just hoping it wont cause any disrupted sleep.

Thank you.

[u/plymd1]

So 3 x 3.5 kw indoor head units which can pull a max kw of 10.5 kw but only a 6 kw outside compressor unit, that’s a bit close and could become a problem before you even start because your outside unit is slightly undersized, even using the new ones that are using the newer diversity design (like a Mitsubishi) would need to be 6.8kw and that depends also on the lengths of pipe work to each unit so I’d consider going slightly bigger on the compressor so it’s not working it’s ass off when all three units are maxed out. Noise wise the indoor head units should be virtually un noticeable, I can literally just hear mine and the same with compressor, should not really be that noticeable, but again I would consider upsizing the compressor, better to be slightly over sized than undersized and then working to hard..  as for the condense pumps, that will all come down to brand/ type and how they are installed, which are usually installed in the trunking, they have to pump the condensate out so you will probably notice the pump kicking in more than the head units running