Split Air con

Please would anyone be able to recommend an indoor coil cleaner? My two indoor Mitsubishi units have started to smell a bit like old socks when they first start up for a little while. When I had them serviced last year they used a cleaning chemical that left behind a horrible chemically blueberry type smell which was awful for the first few months after them cleaning it. I don't want them to do the same thing again so would like to give it a go myself.

Is it straight forward? Can you recommend a product that has little to no residual smell but gets rid of the bacteria or whatever is causing the smelly socks smell?

Thanks.
 
Mason- said:
Interesting that your Inlets come from your hallway, I assumed it would just take air from the loft and filter it. But makes sense to take it from the hallway it'll likely be cleaner.

I could also put a roof vent tile and have it take input air from outside.
Click to expand...
You want it to recirculate the air already inside your house. Doing so uses orders of magnitude less energy and your house should already have sufficient ventilation.
 
b0rn2sk8 said:
You want it to recirculate the air already inside your house. Doing so uses orders of magnitude less energy and your house should already have sufficient ventilation.
Click to expand...
True but then it makes sense to use an inlet and outlet in every room. Rather than outlets in the bedrooms and inlets in the hallway.
 
Mason- said:
True but then it makes sense to use an inlet and outlet in every room. Rather than outlets in the bedrooms and inlets in the hallway.
Click to expand...
Yes but then you’d need one ‘indoor (loft)’ unit for every room.

Having one big one with outlets in multiple rooms and a single control is a lot cheaper to install. Obviously you lose that per room control.
 
Last edited:
happy_2008 said:
I have a loft ducted unit! I find it works better than the individual units as they can often get too cold. The lowest temp on the ducted units are 19 so you can sleep comfortably with it on in all rooms. Only downside i've noticed is that it takes longer for the rooms to cool down, i typically turn mine on 40 mins before the kids sleep to cool down the room
Click to expand...
Ducted here, 4 bedrooms, outlet in each, inlet in 2 of them and one in the hallway. as above takes longer to cool down, but I generally just leave mine going all day and night at 20c as I wfh and in winter at 17c to keep upstairs nice and cosy. have adjusted the ducts as the temp unit is in our bedroom which gets sun and heat later in the day, so cooler in the morning. I'm planning to add another inlet in the main bedroom and adjust the outlet to right above the bed to help in the summer heat. (take out any residual heat and nice fresh cold air sinking down on to the bed).
 
b0rn2sk8 said:
Yes but then you’d need one ‘indoor (loft)’ unit for every room.

Having one big one with outlets in multiple rooms and a single control is a lot cheaper to install. Obviously you lose that per room control.
Click to expand...
Presumably it is possible to have per room thermostats. The outlet ducts from the fan can be individually controlled. If a room reaches temp, then close the duct to that room.

If all rooms reach temp. All ducts close and the heat pump can turn off too.
 
Last edited:
Mason- said:
Presumably it is possible to have per room thermostats. The outlet ducts from the fan can be individually controlled. If a room reaches temp, then close the duct to that room.

If all rooms reach temp. All ducts close and the heat pump can turn off too.
Click to expand...

You can control the temperature of each room with only one unit in the loft, what you need is a motorised manifold attached to the indoor unit with dampers that each room thermostat controls.

As a self installer the above is the point i got stuck at, i could only source a motorised manifold for one manufacturer, which was very expensive, and it all looked like massive spagetti of pipes in which most of the loft would have been lost.

Went for a Mitsubishi R32 mini split instead and just placed the wall units in less obvious / visually impactful places.
 
Last edited:
Yeah, you need addition hardware to do per room control with a ducted system and only on some systems even then. You also have the issue that air circulation isn't as good as the vents don't distribute air anywhere near as well as a proper FCU does, and the overall system efficiency is a bit lower too.

On the plus side, ducted systems are more discrete. So, it really depends on your priorities.

For us, we considered ducted upstairs - but every ducted system I've ever used has always been a bit underwhelming in terms of performance, so we just stuck with FCUs in every room in the end. Sure, you can certainly see them, but you just can't beat the performance and control.
 
Mason- said:
True but then it makes sense to use an inlet and outlet in every room. Rather than outlets in the bedrooms and inlets in the hallway.
Click to expand...
No it doesn't, because you want to promote a lot more airflow through the whole house (or the whole upstairs). Otherwise the send and return circulates only in the ducted rooms, leaving the landing/hallway still warm.
 
Last edited:
squerble said:
No it doesn't, because you want to promote a lot more airflow through the whole house (or the whole upstairs). Otherwise the send and return circulates only in the ducted rooms, leaving the landing/hallway still warm.
Click to expand...
Yeah but I don't particularly care about cooling down the landing.
 
I can’t stand this heat anymore so looking to get this installed. Has anyone got a recommendation for an installer in South East London?
 
Already have split aircon was in the house when we moved in but looking at upgrading to get aircon put into more rooms, does anyone have a recommendation for installer in the South Lincolnshire area please.

Thanks
 
have two quotes from local fitters for a two room split, unsure of which is best:

1753718956093.png


and

1753718972737.png


I'm going to the check the second, as I think it implies I'll be getting two condensers, which I don't really want.

Which would people go for? The 600 isn't an issue providing the value is there in it.
 
£600 is 600 at the end of the day. Not sure any difference between brands will make up for that.

How big are the rooms you are putting these in? They seem rather large for a typical U.K. bedroom/office room.

The heat loss/gain of my entire 4 bed detached house at a temperature difference of 23c is only 5.5kw.

That doesn’t include any solar gain shouldn’t be massive unless the room is covered in rubbish glass. Practically in the summer, the most you’ll see is a temperature difference of 10 (30 outside vs 20 inside).

That said, there may not be a suitable multi split unit which is smaller than 5kw as that’s a pretty small unit in reality.
 
Last edited:
You must log in or register to reply here.
Back
Top Bottom