Oh boy, here we go. :gah: So, the new air handler was installed today. When I returned home, the system was operating, and the air handler is very loud. I contacted the HVAC tech and he stated that it was at the correct speed. He mentioned that since the old blower was failing that it didn't have sufficient air flow and that is why it was quieter. The air flow out of the air ducts seems quite strong compared to before. They installed a AMST36CU1400 and my outside condenser unit is a GSX140311. Is it that I am not used to the sound of a new air handling unit? Thanks for your feedback.
New Air Handler Installed (Very Loud)
kaizen099
1 - 20 of 60 Posts
Oh boy, here we go. :gah: So, the new air handler was installed today. When I returned home, the system was operating, and the air handler is very loud. I contacted the HVAC tech and he stated that it was at the correct speed. He mentioned that since the old blower was failing that it didn't have sufficient air flow and that is why it was quieter. The air flow out of the air ducts seems quite strong compared to before. They installed a AMST36CU1400 and my outside condenser unit is a GSX140311. Is it that I am not used to the sound of a new air handling unit? Thanks for your feedback.
Joined
·
16,278 Posts
Says that’s a 9 speed Air Handler, if your old Air Handler was quieter and less air coming out of the registers, and this has more noise from the registers, sounds like your moving more air.
What size is your Air Handler compared to your old system, is the width the same.
What size is your Air Handler compared to your old system, is the width the same.
This new air handler is a 3 ton, and the outside condenser is a 2.5 ton. I asked why the new air handler was 3 ton instead of 2.5 ton which would match the outside condenser and they stated it was done for efficiency. As far as the size of the air handler is concerned, it's the exact same size width, height & depth as the previous unit.
Joined
·
21,898 Posts
It would be interesting to know what "speed tap" on the blower motor he set this system to, and how he determined it was the correct one.
You might want to ask him that question.
If he didn't determine your systems "total external static pressure" first, he is only guessing.
It is a common occurrence when an old system that utilized a psc blower is replaced with a new air handler that utilizes an ECM blower without duct modifications.
The psc can’t move its rated amount of air without sufficient ductwork and an ecm will (or will try to the point of failure) move the rated amount of air but will fail prematurely and often will be noisy.
The psc can’t move its rated amount of air without sufficient ductwork and an ecm will (or will try to the point of failure) move the rated amount of air but will fail prematurely and often will be noisy.
Thanks for all the information, my previous unit was an ASPT30C14AB which had a multi speed EEM motor, the HVAC tech is coming again this week. I could already tell the blower motor speed needs to be slowed down as my previous unit used to reduce indoor humidity much quicker. (Slower air flow over the evaporator coil removes more humidity). I can already tell that the humidity isn’t being removed as rapidly as before. The installation price was very good. It was basically double the price to install a new air handler versus replacing my failed motor. (I was motivated by price and references) Honestly, with my experience in this forum I should have known better. I know not being present during the installation isn’t an excuse. I will ask the installer about the static pressure and blower motor speed adjustment. With my previous unit, during the summer the HVAC would stay on the whole day just to maintain 76 degrees and the humidity would drop to about 36% to 39%. Right now the humidity is at 56%, inside temperature is at 73.2 degrees and outside temperature is at 62 degrees. Thank you.
Joined
·
16,278 Posts
Make sure to register your new Air Handler to get the 10 year parts and coil warranty, if Air Handler never gets registered it will revert to a 5 year warranty.
California and Quebec need not be registered to receive the full manufacturers warranty.
California and Quebec need not be registered to receive the full manufacturers warranty.
Hi, just wanted to give an update. After allowing the system to operate 1 day, today's outside temperatures were higher than yesterday. I have the thermostat set at 75 degrees. I roughly measured the temperature split out of the supply and return and it was roughly 19–20-degree split. Relative humidity has maintained between 50% to 53%. I was always previously complaining of low relative humidity with my previous air handler. I wish my air handler was located in a hallway, but it is located right next to my living room where the TV is located. Do you think I should let the HVAC operate for a couple of days and monitor temperature and humidity performance before confirming the follow up tech visit? Thank you.
Joined
·
21,898 Posts
There is no harm in letting it run for a few days to see if the system provides the comfort you expect.
I do have to ask: What happened to your complaint about the noise issue?
Are you getting use to it?
I would still be interested to know what static pressure your system is operating under, and what speed tap the tech set the motor to operate at.
Should you call him back out, be sure to ask those questions.
Hi, I am going to schedule the tech visit next week. I might be getting used to the new air handler noise/sound. The new air handler is certainly moving more air. There is very strong air flow out of all the supply ducts compared to the previous air handler. I replaced all the ducting back in March of 2021. I feel that if the blower motor is dialed down 1 or 2 speeds it will be perfect. This is what I feel from my experience living here and how the humidity decreases and increases between cycles. The previous air handler, according to the ecobee graphs, would remove about 5% to 7% each cycle. I attribute this to the lower blower fan speed. With the new air handler, at the current blower motor speed, it only reducing relative humidity by about 3% to 5% each cycle. Is it difficult to for an HVAC tech to change the blower motor speed on this model AMST36CU1400? When the tech arrives, I will ask him what the current speed is set at. What do I do if he says he can't perform the static pressure test? I am just asking in case he makes this difficult. If he just says that he will lower the blower motor from the current speed, what do I do? Just tell him to lower the speed and see how it changes my measurements? Thanks again for your time and advice, I appreciate it. I wish we had a Professional member that posts on this forum that had a company in Southeast Florida. It looks like your closest professional member to me is in Cape Coral.
Joined
·
21,898 Posts
Changing the blower speed is not difficult.
There are 9 different speeds that can be set, but without knowing what your static pressure is, you don't know which one will give you the proper airflow.
Your 2.5 ton outdoor unit should have about 350 to 400 cfm per ton (875 to 1000 cfm) of airflow.
I would call the company before they arrive and ensure they can perform that test.
Just randomly setting a lower blower speed would not be advised.
I called HVAC tech today. No answer yet. Just a quick update regarding system performance. It's been maintaining this so far today. Temp is set at 75 degrees; outside temp is 76 degrees (outside humidity is 73%).
I have noticed that the sound that is bothering me is some "buffeting" in the air as it enters the air handler closet. When I open closet door, it reduces this "buffeting".
![]()
![]()
![]()
![]()
I have noticed that the sound that is bothering me is some "buffeting" in the air as it enters the air handler closet. When I open closet door, it reduces this "buffeting".
Joined
·
15,127 Posts
I suspect the louvered door does not have enough free air space for the amount of air being moved. That’s a common issue for your set up.
I like a nice, big, mechanical room and plenty of room provide in the house for ducts. But now builders make the system fit what little space they can spare.
I like a nice, big, mechanical room and plenty of room provide in the house for ducts. But now builders make the system fit what little space they can spare.
Joined
·
54,330 Posts
I don't see a filter in that picture?
Joined
·
54,330 Posts
Oversized equipment on undersized ducts.
The pleated filter makes it worse.
Hi, good morning, So, this isn’t working out. Installer got back to me and stated his supervisor could come by on Thursday to check static pressure and blower speed. Humidity is consistently between 55% and 60%, the previous air handler would maintain between 45% and 50%. The new inside evaporator unit is a 3-ton Goodman (AMST36CU1400) and the outside condenser is a 2.5-ton Goodman (GSX140311). Installer stated that the new larger inside evaporator coil was more efficient. Is this a problem? Can this new 3-ton evaporator air handlers blower motor (9 speed) be adjusted to maintain 45%-50% humidity or do I have to install a matching 2.5-ton inside evaporator air handler unit? I have a feeling that the air speed is too fast and it’s not giving the evaporator coil sufficient time to dehumidify. It seems the system reaching set temperature before removing sufficient humidity to maintain a comfortable environment. The previous unit consistently maintained less than 50% relative humidity. I have always used 2 hospital grade calibrated hygrometers. I also have vaulted ceiling (10ft at highest point in all rooms). dan sw fl helped me out before with this load calculation. Thanks again for all your assistance.
![]()
![]()
![]()
Joined
·
54,330 Posts
and trying to move 25% more air if they didn't change the settings.
1 - 20 of 60 Posts
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
-
?
