I have a Evcon mg9s060b12mp11a with central air conditioning in a 700 sq ft mobile home that has been remodeled to have the rectangular house sized ductwork. When the fan comes on for both heating and cooling there is no speed difference that there should be. The room floor vents have extremely loud blowing air noise, so loud when using an assistant smart speaker with voice commands, the speakers microphones have so much wind noise the smart speaker has difficulty understanding the voice command. The speed and amount of the single air vent of the bathroom is so extreme it separated the glued linoleum off of the entire wood flooring. The air moves is too fast and such a high volume that humidity is not removed from the air. When the fan runs it sounds like an airplane is flying through this mobile home and you can't hear the TV over the blowing air noise. How can this units fan blower be slowed down to an appropriate level to be efficient and less air blowing "wind noise". The furnace that was replaced with this noisy blower air Evcon mg9s060b12mp11a was a non-mobile home gas furnace and was nearly silent when it was running and the volume of air movement was barely noticeable. There was no problem with the home furnace system and it was only replaced because of a state weatherization program that said it had to be removed and replaced with a mobile home furnace. Which if I knew what problems were going to happen I would have refused to let them replace the furnace. This mobile home was completely gutted and remodeled in 1999 with all sheet rock walls and ceilings and has very little air leakage measurements. The bottom of this MH has the plastic type of skirting removed and replaced with solid metal sheets with the bottom edge attached to railroad ties and buried below the soil surface to prevent animals from getting under the mobile home.
Who ever designed and installed your system probably using wrong sizing for duct work and never balanced the air flow-- also should be able to adjust but keep in mind system design need certain air flow over coils so will probably need to redesign the plenum --trunk --and vents
Testimonial: "The original HVAC unit and central air installed along with the home rectangular under flooring ducts and floor vents were all non-mobile home specific, the actual HVAC used when I purchased the mobile home was an HVAC for a regular home and worked very well and quietly. The issue that got me to the current HVAC situation was I was unemployed(now disabled) and applied for some assistance programs, where one of these had a weatherization team come to the home and repair or replace anything needed. The hvac was functional less than a few years old total but they replaced it with the "for mobile home" hvac Evcon MG9S060B12MP11A, which I refer to sounds like a 757 flying through an easy bake oven. The hvac unit only was changed out and the ducts were all left as they were already. So shouldn't the people who installed the evcon have also replaced the ducts as well to the correct/propper size?"
I have recently had some issues with the blower fan motor as well as the entire blower fan assembly in this furnace and It has led to an unexpected discovery.
The motor rotation is counterclockwise which is the proper direction the blower housing arrow shows for the direction of rotation, however looking at it closer the fan wheel blades are going the wrong way and the CCW motor and housing have a CW fan wheel installed instead of a CCW fan wheel like it is supposed to be.
Could this be a reason why this furnace blower fan air noise is so loud and did not improve using lowest speed on the motor?
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