Hi all,
Looking for a decent wall mount for a 12kw Fujitsu compressor (about 100kg).
Bunnings one looks rubbish, with no support underneath.
Any recommendations?
Secondly, thinking about mounting it sideways. Can't see the compressor being flat against a hot brick wall being any good!
Anyone done it?
didnt you hear OP, theyre not concerned with engineering and such things. IT LOOKS RUBBISH !!
cheers, but I don't trust a bracket without support legs underneath. 250kg max at the wall I would say, definitely wouldn't support the weight sideways once leverage is factored in.
The bracket would have a bit of "Taiwan bridge" about it.
250kg max at the wall I would say
…are you a Structural Engineer?
definitely wouldn't support the weight sideways
Do you understand physics?
Not a structural engineer, but have the lights on upstairs!
As for Physics, think I do…
If I put a centre of mass of 100kg 1cm from the wall it would exert 'X' amount of torque on the end of the arm (axis). I think 9.8NM.
If I put that same 100kg 100cm from the wall, the torque force on the end of the wall would be much higher. I think 980NM, or 1000kgm.
This is how these would fail I would say, ie the arms would rotate..downwards! But they aren't rated in NM.
But looking purely at numbers guessing, they will hold 100kg at 25cm? ..falling like a bag of hot sick at 26cm.
How did I do?
Happy to be wrong, just dont want my $4000 AC unit going down like Miley Cyrus on a weekend girls trip!
Without bracing, I don't rate a bracket..the word brace is basically in there..they are meant to be!
…So anyone know a good place to buy brackets with bracing?
How did I do?
You definitely proved to us all that you never did High School physics lol
P.S. I didn't neg you
@Typical16-bitEnjoyer: Hey, happy to be corrected.
Can you show me how much force you calculate would be exerted at the axis point on these two scenarios?
100kg- 1cm lever
100kg- 100cm lever
I just used a torque calculator to get these numbers.
http://www.calculatoredge.com/new/torque.htm
Since its a lever fixed at one end, compressor on the other end, it's a turning force (torque)?
Can you show me how much force you calculate would be exerted
Can I? Yes. I went to high school.
Since its a lever fixed at one end, compressor on the other end,
@Typical16-bitEnjoyer: Not seeing your answer?
Couldn't careless about the high school blah blah. Just want to know what the answer is?
Answer to your gif, 'yes'. It's only attached at one end, and it has to be a minimum of 20cm from the wall. I would like more than that for better air flow.
@tunzafun001: Why should I? You have made no attempt to find the answer yourself and have just shut down input from other posters here. All your views are based on arbitrary thoughts with absolutely no basis on fact. This simple bracket and a simple equation.
I'll only provide you with hints. Nothing more. Find the answer yourself.
Can't see the compressor being flat against a hot brick wall being any good!
150mm clearance is norm. About 105mm clearance required from average Fujitsu footings. Easy peesy with that bracket.
I don't trust a bracket without support legs underneath
100kg 100cm from the wall,
100kg- 100cm lever
It's not a lever. Look at the design. Look where the force is being applied. Look at the multiple ways force is being addressed, including towards the wall.
Heard of a Newton?
@Typical16-bitEnjoyer: I made no attempt? I actually provided an answer and asked you to check it for me. But you just reply in code? Why so angressive? It's just a forum to help each other. Looking back "torque force on the end of the wall" was poorly worded, but I think you know what I mean.
One last attempt. There is a sheer wait on the bolts. No leverage. Straight forward.
As soon as you move mass along the member there is no force applied toward the wall, only straight down (unless it has stays underneath). Newton and apple). Try and hold say a 20kg bag of groceries with a pole 10cm away, then try again from a 1m pole. I guarantee it get harder. Having a scale with even weights at each end with different length arms won't balance. So not sure where my physics are wrong here. If you want to provide an answer, that would be great. If not, I'll guess you either don't know, or just trolling.
So with the coded response I'm guessing you are saying the leverage factor is minimal if 15cm away from the wall? But I'm looking at approx 50cm as I want more airflow, and I need a bracket that will hold 100kg at this distance.
@tunzafun001: Nothing you said was an answer. Just guesses. 250kg? How did you come up with that figure? 980NM? 4-5 people said the bracket will be fine. But whatever? lol.
Not aggressive, just honestly can't be bothered teaching you physics. That particular bracket will easily take double the required weight. Mounting sideways? Zero point. Shade will do more justice than distance from brick (which again only needs to be 150mm)
You clearly don't want that bracket so don't buy it? Get an installer to do it for you. Or spend $500 on an over engineered bracket. IDC.
@Typical16-bitEnjoyer: 250kg is what the Bunnings bracket is rated to hold.
My point being is that figure is irrelevant as it doesn't specify if that 250kg is at the very end of the member, middle or start. Hopefully we agree this will make a difference.
As for 980NM. My compressor is about 900mm wide/ 100kg. If I mounted it lengthwise, compressor side (heavy side) would be furthest from the wall. With a 100mm gap, we are up to 1m away. So I crunched the worst case numbers. 100kg, 1m * gravity. Well outside Bunnings 250kg. These numbers have now been confirmed, so my high school teacher must have been ok.
After hanging off a Bunnings one (I'm 80kg) it started to bend. So I can see how the 60kg compressor broke one in the reviews. Mounted on the end of the bracket, a little bouncing from the fan..bang! Puts that to bed.
One thing we do agree on, I've gone for a spot around the corner on the dining room wall that faces south (no sun). So standard flat back mount, but I'll give it double the minimum clearance.
Amazing heaps of cantilever brackets in eBay UK, and US. Only one in Aus (Melbourne- pick up only).
My advice if anyone is looking at mounting anything to hold a load. Get stays underneath.
Sideways?
Basically compressors get mounted flat against the brick work. So all air being drawn through will be from hot bricks 10cm away (always found this odd). I'm asking to mount it long ways so the back is open, away from the bricks and only the small side faces the wall.
I think your overthinking it, I don’t think the ambient temperature will change much 10cm-80cm away from bricks. All you will achieve will be a visually odd looking mount which will have greater leverage on the fixings into the wall.
The one from bunnings will be fine.
In terms of mounting it sideways, the gas is on the side of the gas pipes so will be impossible to plumb, the other way around you'll have the weight further off the wall.
Just get the one from bunnings and let your installer do the job
Read the Bunnings review, installer put a 64kg unit on it and it bent haha
Yeah that's no good, but it's only one review and who really knows.
Can always go to AAD and grab one
Hi mate, this is the bit I need. Whats AAD ? Good point about the gas side and weight distribution.
@tunzafun001: Australian air-conditioning distributors. They'll give you the same thing but better quality if that's what you're after. There's at least one in Adelaide
AC wall brackets don't have bracing. The vertical leg goes up behind the AC. The point of failure will be the top fastener.
There are hundreds of thousands of wall mount ACs using this style of bracket. What makes your situation unique.
I have 2 wall mounts. They are rock solid. Having the AC bracket fail is the least of my worries.
BTW: A 2.5hp outside unit only weighs about 40-50kg. Light enough that I can pick one up and put it in my car.
My qual: Mech Eng
https://www.airconditioning-online.com.au/product-category/a…
Cheers. I think their $100 bracket might be the right type, but there is no image! Hopefully like this.
https://www.ebay.com/itm/STEEL-Wall-Mounting-Bracket-Cantile…
The Bunnings type are probably fine for a split, but a ducted unit, I'd give it a miss (hence my number crunch above). Was I on the right track?
By top fastner failure, do you mean the dynabolts?
As for being unique, yep I question things and do things different. The manufacturers specify the minimum distance the compressor should be mounted from the wall. Installers seem to take this as 'the set' distance from the wall. But just looking at it, it's so close to the wall. It will work, but the fans will be working harder to draw air through. This means more wear and running costs. So I'm going to put it as far out as I can (and its high off the ground, so no issue of obstruction).
As a point of reference, the AC I'm replacing is a 1970 model and is still running (just not efficient). The feedback I'm getting is an AC system will last about 8 years. I recon with better cooling (ie. more distance from the wall) that number can be vastly improved. Plus the extra efficiency/ $avings that go with it.
My double fan compressor is 101kg (in the manual). Based on my numbers above, I dont think a 250kg max loading will cut it.
Hope that makes sense. Cheers for the link.
My first suggestion is to ask the seller or manufacturer if the rating is measured at the wall or at the end of the horizontal member. I think it's the end of the member as the wall rating is all tied to the fasteners (it's just a shear load).
By unique I mean there are thousands of outside units mounted on the wall so what is different about your installation?
Yes, the top dynabolts will probablyfail first as they will have the most tension on them as the pivot point as at the bottom. If they are sized and installed properly you won't have an issue.
Doesn't the air get drawn in the back and expelled from the front? I can understand your theory but in practice I doubt it's a game changer. I'm thinking the minimum distance isn't just an arbitrary figure pulled from the air (pun intended).
If the unit is ever in direct sunlight then a shade would also be a good thing to increase efficiency.
Is there any reason you aren't letting the installer do their thing and warrant their workmanship and materials?
Keep the condensor clean. I pulled one off the kerb yesterday and the condensor was totally blocked with greasy dust and obviously why the unit wasn't working.
Cheers mate. Glad you understand where I'm coming from with sheer mass on the bolts vs holding capacity at the end of the member. You would logically think rated at the end, but these days they will do anything to make something sound better. Bunnings have no idea. But, I tried hanging off one, and I'm 82kg and it did not feel solid at all. So 100% not using that.
The position where I have to put my compressor is a bit unique/ not ideal with direct sun on brick. Manufacturers specifications don't really state brick temp, but here 50C+ is likely. So the installer said to try and find / get a bracket manufacturered for more clearance. We are on the same page.
As for the condenser, yup. I got this cheap as someone upgraded saying it was too small. It was just clogged and needed a good clean.
@tunzafun001: use a standard bracket and add 25mm square section stays at a 45 degree angle underneath
Just to put some finality to this thread, I ended up going to the bracket source/ manufacturer (metalflex).They showed their non supported bracket uses a triangular arm (so kinda is supported). Far superior to Bunnings (same price). However, he showed that the distance from the wall with these brackets are preset to 3 options. For $15 more I went with a 700mm long bracket that is variable, stays underneath and put the compressor right on the end. Its solid as a rock and the air flow is fantastic. Thanks all. Hopefully lasts 20 odd years+ P.S. attaching a heavy compressor 2.5m up…fun times. Removing a 150kg+ old roof unit from 2.8m. Even more fun..
Bunnings is rated to 250kg so why fret
https://www.bunnings.com.au/crest-universal-air-conditioner-…