minisplit vibration isoloator?

[Kaizen]

Been a month with my diy mr cool 12k minisplit and all is going well with the unit. only issue is a vibration coming through the well as I wall mounted it. Sounds like a dump truck idling out on the street. As I get feet of snow I really want to have it not on the ground. anyone use some kind of vibration isolators like the ones below that helped? And would I put these just under the unit between the hanging frame and unit or would I put between the house and the unit as well?

https://www.amazon.com/dp/B00QMRQM52/?tag=atomicindus08-20

 

[steve308]

Lowes / Home Depot should have rubber gaskets / o-ring etc.., that will serve the purpose on the massive nut and bolt wall. Surprised they didn't come with the unit or wall mount kit.

 

[kd7gab]

You may find something appropriate through Supply House (great place for lots of plumbing and HVAC stuff): http://www.supplyhouse.com/Vibration-Isolators-23502000

 

[Kaizen]

Lowes / Home Depot should have rubber gaskets / o-ring etc.., that will serve the purpose on the massive nut and bolt wall. Surprised they didn't come with the unit or wall mount kit.

the wall mount had a very small rubber washer with it. obviously not enough. i'm thinking I need some serious isolation from the unit to the hanger because at the wall the lag bolts go through the hanger transferring any vibration. to make matters worse its clapboards at the house.

 

[kd7gab]

the wall mount had a very small rubber washer with it. obviously not enough. i'm thinking I need some serious isolation from the unit to the hanger because at the wall the lag bolts go through the hanger transferring any vibration. to make matters worse its clapboards at the house.

Definitely checkout the link I posted earlier. They have full on vibration isolators designed for use with HVAC and they come in a variety of designs and weight capacities.

 

[Kaizen]

Definitely checkout the link I posted earlier. They have full on vibration isolators designed for use with HVAC and they come in a variety of designs and weight capacities.

Thanks. I don't want to spend 340 dollars though. The neoprene ones might be doable but they don't give the measurements. Thanks for the link

 

[steve308]

grommet about a buck and a half at lowes ---- just one size of many

sorry for the mega picture ----

 

[Kaizen]

I'll give that a shot first before I get a kit or the expensive stuff. its not a really bad vibration just when it kicks into high speed.

 

[Jackfre]

Vibration isolators must be compressed or loaded in order to work. I found that out the hard way years ago. I don't quite get the science behind it but perhaps one of our Engineer friends can enlighten us on that.

http://www.mason-industries.com/masonind/

 

[Milton Shaw]

Make sure the mounting bolts for the compressor were loosened from the shipping position to keep everything in place. I know PTAC units always have them tight for shipping and if you don't loosen them you get loud noises from the system. I haven't installed a mini split but would think they would probably be the same way. I have even seen packing material still in units making a lot of noise. Same with packing material left in fan to keep from damaging the condenser coil..

 

[Warrenator]

I put mine on a piece of stall mat, that is a thick rubber mat for horses to stand on, you can buy a new one for 40 bucks, it is 8 x 4 feet and heavy heavy recycled rubber. Works great.

 

[theoldwizard1]

As I get feet of snow I really want to have it not on the ground.

Use blocks stacked up high enough to be above your snow level, throw down some PT 2x4 and then one of those concrete coated foam A/C pad. I would some how anchor the unit to the bottom block.

 

[rlitman]

Vibration isolators must be compressed or loaded in order to work. I found that out the hard way years ago. I don't quite get the science behind it but perhaps one of our Engineer friends can enlighten us on that.

http://www.mason-industries.com/masonind/

That depends on the vibration isolator. Some are work more uni-directionally than others.

 

[Kaizen]

Use blocks stacked up high enough to be above your snow level, throw down some PT 2x4 and then one of those concrete coated foam A/C pad. I would some how anchor the unit to the bottom block.

Yes i'll have to do something like this if I can't get it tolerable. This area of my yard I want to take out a foot of soil. already took out 6 inches just to get it off the siding. so i'd have to do that before I put down the pad. which is why I figured a wall mount would be better to get it in and working. all of my projects seem linked into a neverending load of work

 

[shillamus]

something like these might be better

http://www.mcmaster.com/#standard-vibration-damping-mounts/=13hu1ou

 

[Kaizen]

Make sure the mounting bolts for the compressor were loosened from the shipping position to keep everything in place. I know PTAC units always have them tight for shipping and if you don't loosen them you get loud noises from the system. I haven't installed a mini split but would think they would probably be the same way. I have even seen packing material still in units making a lot of noise. Same with packing material left in fan to keep from damaging the condenser coil..

thanks. the bolts were not attached and actually run through the hanging bracket. so i'm going to insulate between the hanger and unit.

 

[Kaizen]

something like these might be better

http://www.mcmaster.com/#standard-vibration-damping-mounts/=13hu1ou

dang some of those are 25 a pop! I think i'll get some of these and give them a shot. under 20 for 4
http://www.mcmaster.com/#standard-vibration-damping-mounts/=13hu4ms

 

[66cj225]

I haven't seen your unit- 2 pc? and the condensing section (outdoor) is making the noise? Sound is made by displacing air (just like a speaker). Is the unit square and mounted to a flat surface? Are the mounting bolts like 16 inches apart (into studs). Wall board needs to be screwed to the studs and the siding, sheathing nailed to the studs from the outside. Is the bottom plate screwed to the foundation? Or you could clean out the dirt/ dust unbalancing the fan. If it's none of that then there's a real problem.

 

[Kaizen]

its new so no dirt or such. yes its the outdoor unit mounted at usual points to a wall hanging bracket. so any normal vibration transfers to the studs/wall. that is what i'm hearing when it spools up or runs at a fast speed. so metal to metal to studs. the kit came with not much of an insulator which is why I began asking if anyone had gotten anything or recommended something.

 

[SALIV8]

not trying to be captain obvious. but have you contacted the manufacturer? They may send you some isolators for free, or suggest what will work..

 

[Git]

Here are some reasonably priced isolators that would probably work. $3.81 each.

https://www.amazon.com/dp/B00DNFGEFE/?tag=atomicindus08-20

 

[66cj225]

I have a 2 ton bolted to the outside of a garage wall that make a low grumbly sound very truck like running on high under load. It's mounted to 2x6 studs with cedar siding on the outside. Can't hear the vibration outside, only inside. Uninsulated, no dry wall. Tomorrow I'll put a hand against brackets and pipes to see if I can get the sound to change. If no, then I'm betting on the compressor.

 

[miketyler]

The wall mounts you buy will most likely include rubber isolation washers that go on top and bottom of the feet. Should also include rubber pads for the wall as well.

 

[Kaizen]

Appreciate all the replies. I'm going to put some poly bushings on it tomorrow. The hanging bracket came with some very thin ones about the thickness of a dime. So I will be upgrading it and will report back.

 

[shillamus]

Here are some reasonably priced isolators that would probably work. $3.81 each.

https://www.amazon.com/dp/B00DNFGEFE/?tag=atomicindus08-20

40mm is just under 2 inches... about the right size.

The cylindrical mount is easier to install

You are looking for a load rating of about 50 lbs each for 4 isolators (assuming unit is 200 lbs)

 

[miketyler]

Wow - thick as dime? Really? The cheaper mount I bought included soft rubber mounts, shaped like wagon wheels about 1/4" thick. Time will tell how they hold up as some rubber deteriorates quickly.

 

[larry4406]

Kaizen - what did you end up using for vibration isolation?

Any pictures of your outdoor setup and the mount you used?

I will need to wall mount one to the side of my attached garage which is vinyl siding. Mine is a Goodman MSG12HW1N.

The mounts I see available typically have a single horizontal "spreader" bar/track at the top to permit alignment with studs then the L-brackets hang from the spreader/track and can be adjusted left/right to align with the feet on the outdoor unit. I see this as crushing my vinyl siding.

Typical bracket I am seeing is similar to link below except this one appears to have many anti-vibration isolation points.
https://www.quick-sling.com/qswb2000

Edit - I found this suggestion for a insulator/standoff when using vinyl siding. it would address the mount for the spreader bar/track but not the pendulum effect of where the L-bracket hits the siding.
https://www.garagejournal.com/forum/showpost.php?p=5034467&postcount=2

 

[Kaizen]

Kaizen - what did you end up using for vibration isolation?



Any pictures of your outdoor setup and the mount you used?



I will need to wall mount one to the side of my attached garage which is vinyl siding. Mine is a Goodman MSG12HW1N.



The mounts I see available typically have a single horizontal "spreader" bar/track at the top to permit alignment with studs then the L-brackets hang from the spreader/track and can be adjusted left/right to align with the feet on the outdoor unit. I see this as crushing my vinyl siding.



Typical bracket I am seeing is similar to link below except this one appears to have many anti-vibration isolation points.

https://www.quick-sling.com/qswb2000



Edit - I found this suggestion for a insulator/standoff when using vinyl siding. it would address the mount for the spreader bar/track but not the pendulum effect of where the L-bracket hits the siding.

https://www.garagejournal.com/forum/showpost.php?p=5034467&postcount=2

I bought some isolators as suggested and installed them between the unit and the stand. It helps. Not quite as much resonating. When I get around to it I will add some between the hanging frame and the building similar to what you posted. No sorry no pictures. Part of my issue is I’m overly sensitive to low decibel noise. Pisses me off for some reason.
I think if I had Vinyl siding I would do what is in that other thread but NOT drill a big hole for water to get in. I’d try and position the rubber/metal hanger on the flat part that touches the sheathing and then just sink a lag screw through the siding. Less water intrusion. If the spacing doesn’t work you might have to drill a big hole. Remember this will be at the bottom of the wall so a lot of water.


Sent from my iPhone using Tapatalk

 

[larry4406]

I bought some isolators as suggested and installed them between the unit and the stand. It helps. Not quite as much resonating. When I get around to it I will add some between the hanging frame and the building similar to what you posted. No sorry no pictures. Part of my issue is I’m overly sensitive to low decibel noise. Pisses me off for some reason.
I think if I had Vinyl siding I would do what is in that other thread but NOT drill a big hole for water to get in. I’d try and position the rubber/metal hanger on the flat part that touches the sheathing and then just sink a lag screw through the siding. Less water intrusion. If the spacing doesn’t work you might have to drill a big hole. Remember this will be at the bottom of the wall so a lot of water.


Sent from my iPhone using Tapatalk

Thank you for feedback. Yeah I’m not keen on drilling a hole like that either. I was thinking same as you and drilling only a small hole at the siding flat area and putting the rubber standoff on the face of the siding. Perhaps strategically place a lower standoff on the bracket to align with siding flat spot as well.

 

[Kaizen]

Thank you for feedback. Yeah I’m not keen on drilling a hole like that either. I was thinking same as you and drilling only a small hole at the siding flat area and putting the rubber standoff on the face of the siding. Perhaps strategically place a lower standoff on the bracket to align with siding flat spot as well.

Yup. I’d go so far as drilling the bracket if the bottom factory holes don’t work. You’re going to love the minisplit.


Sent from my iPhone using Tapatalk

 

[LS6 Tommy]

I've used these for years. They secure the unit to the mounting brackets very well, too:

https://www.grainger.com/product/GRAINGER-APPROVED-Flr-Mnt-2-Pc-Cntr-Bnded-Vibration-2NPG8