You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.
You should upgrade or use an alternative browser.
Noise from heating system.
- Thread starter Jsf721
- Start date
pseudorealityx
Well-known member
If you put the cover back over the filter, I assume the noise remains? It sounds like something is vibrating... like when kids put a piece of grass between their fingers and blow through it.
Exactally what it sounds like. I bnelieve it is the air rushing over the carboard on the filter. This is a brand new system and it take these filter that are like 2" thick. The noise it crazy loud when you are trying to sleep. Weird thing is that it does not happen all the time. The installer is coming back today to look it over. THough by replacing the whole system I would be in the clear. Everytime I fix something the right way, it bites me in a weird way. Getting tired. I only replaced the old system becasue it was submerged in salt water for a day and a half after the flood. The old system ordered but first the thermo-couple went bad, fixed it, then the relay to the blower motor went bad, fixed that. then the thermostat harness off the machine went bad and i decided to replace the whole thing rather than replace the 1961 unit peice by peice. Plus my new unit is 93% efficient now but it whistles like crazy.
If you put the cover back over the filter, I assume the noise remains? It sounds like something is vibrating... like when kids put a piece of grass between their fingers and blow through it.
pattenp
Well-known member
Is the filter air flow directional? Have you tried flipping it or rotating it?
I couldnt get the video to work but from the description and the filter looking like its halfway out, does sliding the filter in and out change the sound? I have run into this sort of thing before, I'm guessing you have a variable speed fan motor, they vary speed to get the right amount of air through the furnace and if the ductwork is undersized the motor works very hard to achieve the airflow. This is very bad, not just annoying. It will cause premature failure of the motor and possibly the heat exchanger if its restricted enough. Hopefully your installer knows a thing or three about static pressure and can offer some options, likely will need more return air, that's usually the problem. But I'm just some guy on the internet that can't get the video to work so I might be way off.
cowboyjosh
Well-known member
- Joined
- Mar 11, 2010
- Messages
- 1,066
It's noise caused by the change in static pressure, a filter severely restricts the airflow. I have customers ***** all the time in new homes that their zoned system sounds funny, and its due to the dampers and the static pressure. Might have your HVAC guy check the blower speed and give everything a once over.
It is air directional and it is installed correctly.
Is the filter air flow directional? Have you tried flipping it or rotating it?
I guess this is what happens when you put a new system in a old house with Old ducts. I did install a new return larger than the original. I am wondering how bad it would be to run with a less restricted or no filter?
I couldnt get the video to work but from the description and the filter looking like its halfway out, does sliding the filter in and out change the sound? I have run into this sort of thing before, I'm guessing you have a variable speed fan motor, they vary speed to get the right amount of air through the furnace and if the ductwork is undersized the motor works very hard to achieve the airflow. This is very bad, not just annoying. It will cause premature failure of the motor and possibly the heat exchanger if its restricted enough. Hopefully your installer knows a thing or three about static pressure and can offer some options, likely will need more return air, that's usually the problem. But I'm just some guy on the internet that can't get the video to work so I might be way off.
What is the fix?
It's noise caused by the change in static pressure, a filter severely restricts the airflow. I have customers ***** all the time in new homes that their zoned system sounds funny, and its due to the dampers and the static pressure. Might have your HVAC guy check the blower speed and give everything a once over.
I guess this is what happens when you put a new system in a old house with Old ducts. I did install a new return larger than the original. I am wondering how bad it would be to run with a less restricted or no filter?
The filter is there to keep the furnace clean. Not to clean the air in the house. Running without a filter in a high efficiency furnace will cause a lot of long term problems and will severely shorten the life of the furnace. So many people focus only on the box when the "HVAC system" needs to be looked at. It's like having a car with a brand new motor, but half a million miles on the rest of the car.
acmikee
Well-known member
it sounds like air restriction. try using a 1" filter. have your contractor measure the stratic pressure across the filter then across the filter and the outlet of the unit.
pepi
Well-known member
Have you removed the filter and run it to verify it is actually the filter causing the noise?
Try a different style filter that has less air restriction.
Put in a cheap 1" filter with lots of airflow and see what happens.
Then apply that logic and get appropriate "block" filter like the one you have now (ie except better flow filter).
My old house only had 1" space and we installed an electrostatic filter housing that used affordable cut-to-size filter material. It really worked as it grabbed up the dust and needed changed every couple months.
Good luck with resolving your noise / airflow problems.
Put in a cheap 1" filter with lots of airflow and see what happens.
Then apply that logic and get appropriate "block" filter like the one you have now (ie except better flow filter).
My old house only had 1" space and we installed an electrostatic filter housing that used affordable cut-to-size filter material. It really worked as it grabbed up the dust and needed changed every couple months.
Good luck with resolving your noise / airflow problems.
Well I won't know for sure but the installer came by yesterday and installed a new filter. He said sometimes there is a sharp edge (or a small hole) on a filter and when the full force of the air from the blower motor rushes over these areas it can/will cause a whistling as the air rushes over the surface or through the hole. He installed a new filter of the same type and brand.
This unit is only a few months old and it would **** if there were gremlins. Hope it all fixed now.
Thank you all for you advice.
This unit is only a few months old and it would **** if there were gremlins. Hope it all fixed now.
Thank you all for you advice.
I couldnt get the video to work but from the description and the filter looking like its halfway out, does sliding the filter in and out change the sound? I have run into this sort of thing before, I'm guessing you have a variable speed fan motor, they vary speed to get the right amount of air through the furnace and if the ductwork is undersized the motor works very hard to achieve the airflow. This is very bad, not just annoying. It will cause premature failure of the motor and possibly the heat exchanger if its restricted enough. Hopefully your installer knows a thing or three about static pressure and can offer some options, likely will need more return air, that's usually the problem. But I'm just some guy on the internet that can't get the video to work so I might be way off.
It's noise caused by the change in static pressure, a filter severely restricts the airflow. I have customers ***** all the time in new homes that their zoned system sounds funny, and its due to the dampers and the static pressure. Might have your HVAC guy check the blower speed and give everything a once over.
it sounds like air restriction. try using a 1" filter. have your contractor measure the stratic pressure across the filter then across the filter and the outlet of the unit.
Have you removed the filter and run it to verify it is actually the filter causing the noise?
Try a different style filter that has less air restriction.
Put in a cheap 1" filter with lots of airflow and see what happens.
Then apply that logic and get appropriate "block" filter like the one you have now (ie except better flow filter).
My old house only had 1" space and we installed an electrostatic filter housing that used affordable cut-to-size filter material. It really worked as it grabbed up the dust and needed changed every couple months.
Good luck with resolving your noise / airflow problems.