Not saying that they absolutely can lift the unit 3 inches, but I've installed many mounts like that after the fact and never had a problem

 

You sound like you got a good handle on it,.

Where abouts in NE are you located? Im in Rhode Island. I reside next door East of the River as we say in Ct.

 

Use small engine rubber motor mounts under heat pumps in situations like this. They basically eliminate the vibration.
Same style as you would find on a Honda water pump

 

The quicksling has a small rubber washer that sits between the frame and the unit already. Doesnt seem to be helping much. Its about 3/8" thick. So perhaps its not thick enough.

Here is my setup. About 8 ft above and to the left is my room...Now that Im looking at the install the rubber washer is sitting ABOVE the unit mounts instead of below. Also you can see I have (2) sets of carflex running on the side. One houses my 16ga stranded and shielded communication cable and 14/2 power from the condenser to branch box and the other houses my 8/2 to the AC disconnect which then runs to my panel for main power.

I

 

What do you have for a system, a ducted Heat Pump, a Ductless Heat Pump? Who installed the system? thinking this is the fourth one in recent posts with similar issues, here is a example how one manufacturer wants line-sets to be run, more of a floating hookup page one, no part of the lineset is touching/ secured directly to suds, walls etc. this example is for a split system ducted Heat Pump.

https://www.google.com/url?sa=t&rct...op.com/content/carrier-hvac-manuals/25HCE4.pdf&usg=AOvVaw1vix7AA4PUTomFrVGjAopR

Figure one page one.

Look up the install guide of your brand model to see how they want to see the lineset hooked up, you can check for kinks yourself anywhere the lineset makes a turn if they are easily accessible.

if “i” were to have the unit lifted an inch to put a waffle down would that break or kink the pipes

Where’s the Installing Contractor on this? Sounds like a new system, if so you should have a one year labor warranty, no? Why not have the Company/Tech. who installed the system install the waffle under the outdoor unit..

Hopefully your system got registered as manufacturers warranty decreases if system never gets registered. California or Quebec need not be registered to receive the manufacturers maximum warranty.

 

I have a multi-zone heat heat pump. I have a ducted unit serving the upstairs and wall mounts in the basement. All the units are connected to a branch box and one set of lines run out to the condenser. Its a Mitsubishi H2I but it is Trane branded so its an NTXMPH0048. The linesets enter the wall like what is shown on figure 1 of the link you posted except no caulking yet.

If I stick my head between the unit and the wall I get a nasty reverb. I dont know if the sound waves themselves are enough to vibrate the walls though.

I plan to attack this in multiple ways. First im going to see if once the walls in the basement are insulated if it helps any. Then im going to caulk around the pipes as they enter the house. Then im going to add sound and fire rockwool insulation in the basement ceiling where my bedroom is located. Then I will add vibration isolation on the stand. And as a last resort im going to look into compressor blankets and Kinetics Noise Control acoustic panels along the L of the doghouse and house that the unit is located.

I will get spring hanger isolators on the attic unit. I dont think that is causing it cause if I deenergize that unit I still get the noise.

And if this doesn't work I will just keep with the box fan to muffle the vibration and hope that the unit isnt as loud in cooling mode as it is in heating mode.

I do estimating for an HVAC contractor so I have been working with our vibration isolation vendor on a solution.

As far as having the installing contractor well I didnt really have a contractor install the system. One of the field guys who works at my company does work on the side and I had him install the system. He did offer to come by and add the waffle. The vibration isolation company also had an idea of attaching a piece of angle iron on both sides of the stand and then attaching spring deflection isolators to that. Then cutting off the legs of the stand and letting these isolators be the legs. The stand is a quick sling. QSMS1801

The more I think about it the less im believing its a vibrational issue at the base of the stand as there is a concrete foundation where 2ft is above grade and then it transitions to wood construction. I doubt the vibrations are strong enough to travel up the concrete and through to the wood.

Im going to source out a price on those kinetic noise control panels. THink this may be the way to go coupled with a compressor blanket.

Where abouts in NE are you located? Im in Rhode Island.

 

Also, if i were to have the unit lifted an inch to put a waffle down would that break or kink the pipes? This noise is driving me nuts.