Home>Discussions>PLUMBING>This noise is killing me!
38 posts / 0 new
Last post
Mastercarpentry
Re: This noise is killing me!
Mastercarpentry

Somewhere back in the thread somebody suggested listening to components through a screwdriver. A few bucks will get you a "mechanics stethoscope" which is a hundred times better. Techies can even get amplified electronic ones.

Noise cancelling earplugs improve my singing immensely and reduce shoe wear from me having to run away when I sing within earshot of humans. My dog doesn't seem to care though :p

Phil

kbpepperell
Re: This noise is killing me!
kbpepperell

I think our next step is probably having the a/c serviced. I'm sure it's overdue. It's a Carrier TECH2000SS Silencer System and it humidifies in the winter and dehumidifies in the summer, so I sort of wonder if that could have anything to do with it. We've tried tracking when it happens but with kids and jobs, we're not great with keeping up with that...but if I were pressed, I might guess that it happens more frequently on days when it is hotter and more humid.

I'm certainly hoping it doesn't come to needing a new unit. We moved in a year ago and spent a lot on updates, plus had to replace the water heater this spring, and the dishwasher seems about on its last legs. The previous owners seem to have moved just in time. Tricky so-and-sos!

I'll post back after we've had the a/c serviced.

As always, I am greatly appreciative of all of your advice/recommendations/humorous suggestions.

kbpepperell
Re: This noise is killing me!
kbpepperell

I'm back...noise unresolved. I had a medical issue that needed dealing with and so we have made no progress on the noise. I work from home and the noise is just on the other side of the door in the basement...it's distracting, at the very least! But today, I finally made a discovery.

I'm attaching a video that shows me pulling on a water line (I think that's what it is...?) and temporarily stopping the noise. It runs from the furnace and through the exterior wall to the a/c compressor. There is a humidifier on the furnace and I have been wondering for some time if humidity has anything to do with the issue. It's been raining for the last day and has been very humid. The noise tends to not happen when it is cooler and/or less humid. So, today it's been nonstop and I threw a rag just around the copper line to see if that would help. It didn't. But pulling it away from the duct did:
https://drive.google.com/file/d/0BzCXINv9QlCjOEJmajU5T1dHODg/view?usp=sharing

Is this a plumbing issue? An HVAC issue? I am mostly asking because I'm not sure what to try or who to call.

Also, here are pics of the line once it's outside:
https://drive.google.com/file/d/0BzCXINv9QlCjVTZ2MnYzOEd2ajQ/view?usp=sharing
https://drive.google.com/file/d/0BzCXINv9QlCjTGJkLWU3dWlWSzA/view?usp=sharing
https://drive.google.com/file/d/0BzCXINv9QlCjRHVicU1qSUN4WFE/view?usp=sharing

Any ideas? It's supposed to be rainy for the next several days, so I'm sure I'll get lots of "events" to experiment with suggestions. :)

Thanks! Kristine

Fencepost
Re: This noise is killing me!
Fencepost

That's a refrigerant line, not a water line. There are actually two refrigerant lines: the low pressure return line (which is the insulated large diameter line) and the high pressure supply line (which is the uninsulated small diameter line). The noise could just be vibration from the outdoor compressor unit telegraphing to the pipe, where it vibrates against the sheet metal of the duct. The fact that the noise comes and goes could be related to temperature changes in both the duct and the pipe.

Try to isolate the pipe from the ducting. The larger pipe should be covered in foam insulation; if the insulation is missing (I see it's missing on the outdoor portion), replace it with neoprene foam insulation (the kind that looks like a fun noodle pool toy).

The uninsulated copper line running vertically from the water pipes in the ceiling joists down to the furnace appears to be a water line, probably supplying the humidifier.

EDIT: I had the descriptions of the lines mixed up. Fixed that.

A. Spruce
Re: This noise is killing me!
A. Spruce

Looks like you just found your problem! :cool:

You'll definitely be able to minimize the noise if you can keep the uninsulated line from touching the ducting and framing. I'd still recommend having your brother or other AC tech take a look to make sure it isn't caused by coolant pressure or mechanical issue with the system.

kbpepperell
Re: This noise is killing me!
kbpepperell
Fencepost wrote:

That's a refrigerant line, not a water line. There are actually two refrigerant lines: the low pressure return line (which is the insulated large diameter line) and the high pressure supply line (which is the uninsulated small diameter line). The noise could just be vibration from the outdoor compressor unit telegraphing to the pipe, where it vibrates against the sheet metal of the duct. The fact that the noise comes and goes could be related to temperature changes in both the duct and the pipe.

I'm excited to be coming at least one step closer to a resolution...but is it weird that we've heard the noise when the a/c was turned off at the thermostat? Once the power in the whole neighborhood was out and it was still making the noise.

The only thing that I'm not sure of is whether this will resolve the high, squealing sound. When I pull on that line, the low, moaning sound stops, as shown in the video. But later that day, the high pitched sound started and I tried pulling on the line and nothing happened.

We will insulate the line and will report back...hopefully, this will resolve all of the phantom noises. Otherwise, I'm calling the Scooby Doo gang because we definitely have a haunting.

Thanks!

kbpepperell
Re: This noise is killing me!
kbpepperell
A. Spruce wrote:

You'll definitely be able to minimize the noise if you can keep the uninsulated line from touching the ducting and framing. I'd still recommend having your brother or other AC tech take a look to make sure it isn't caused by coolant pressure or mechanical issue with the system.

It's time to have the a/c serviced, I'm sure, so we'll do that after we've insulated the line. I appreciate everyone's willingness to help on this issue...I'll definitely report back!

Pages

Sponsored Stories

TV Listings

Find TV listings for This Old House and Ask This Old House in your area.