Results 40 to 47 of 47
10-08-2012, 11:10 PM #40
Visual inspection of the supply ducts can advise a tech of potential problems, such as leakage, kinked and/or sagging runs, duct sizes, length of runs, etc. But you need someone competent who can do both a visual assessment AND understand results of a TESP test. AND then know how to advise you accordingly.
What type of duct material does the problematic system have?"In this house we obey the laws of thermodynamics!"
- Homer Simpson
10-08-2012, 11:16 PM #41
Regards TBBear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
Use +Merv 10 air filter. -Don't forget the "Golden Rule"
10-09-2012, 07:56 AM #42Regular Guest
- Join Date
- Sep 2006
The Amana package unit has 16x16 openings (supply and return). The installer measured the flow at 1187 after slowing the blower down by one setting. We've slowed it down 2 more settings (I believe) since installation.
Restrictions/kinks seem to be in good shape. There's a slight return duct restriction where it exits the brick wall, but it's not major. The supply runs to the registers have some very minor kinks due to copper and PVC pipes, but they seem reasonable. I get great air flow out of every register. There are dampers for the runs and they have been adjusted and roughly balanced.
Kind regards -- look forward to the comments!
10-09-2012, 08:32 AM #43
Package unit?, as in "outside"? I would check to make sure there are no air leaks in that unit; it may be pulling in outside air. That bonus room over a garage? Good source of air leakage there also.An answer without a question is meaningless.
Information without understanding is useless.
You can lead a horse to water............
10-09-2012, 08:36 AM #44
I am familiar with these style M chassis package unit from goodman and I do believe it is a 2.3ecm blower.
So a return restriction will definitely increase velocity thru coil because motor will run full tilt boogie.
I just at the same time still agree with TB that decreasing static will certainly be a great project but unlikely to actually lower humidity.
Sidenote :: I have had 2 customers complain about humidity after we installed said m chassis goodmans.
I wonder if someone can compare Ari data and see if there is a reason these units are not dehumidifying well.
10-09-2012, 12:44 PM #45
What I sought to illustrate was a restrictive return decreases overall air handling volume as compared to what the system could move in terms of volume if the return (and supply) ducting were not overly restrictive. I think you would agree with this point.
Recently our regional association of RSES held a business meeting in a hotel banquet room in Waco, TX. We quickly noticed that every time the a/c kicked on, the room filled with a horrendous noise of air rushing through a grill. It did not take long to find the source; it was an 8 x 8 return grill located dead center in the room attempting to return all of the air for a 1,600 square foot banquet room! I can only imagine the feet per minute velocity across that grill, but I also know full well that system, probably three tons or more, is severely starved for air volume and its a wonder the compressor hasn't died, yet!
I do agree with you, and in hindsight should have worked this into my post to the OP, that his system will not dehumidify well if it is starved for return air. It is true that if the system is starved for return air, it will run a colder coil/lower dew point. It will not, however, be a better dehumidifier for the house, because the latent gains to the house outrun the ability of the system to move enough air over the coil to get rid of it.
My caution to the OP is that increasing the return size may or may not solve the problem, as that would depend on how well the supply side delivers air without undue restrictions or leaks. Tips brought up a good point about the system being a package unit located outside. I would definitely advise the OP to check the unit's blower door, and to check if it has a fresh air intake. I also mentioned in my very first reply if the mechanical side of the system has been checked for problems. Not sure OP ever responded to that question."In this house we obey the laws of thermodynamics!"
- Homer Simpson
10-09-2012, 07:56 PM #46Regular Guest
- Join Date
- Sep 2006
Yes, Tips, I've heard some whistling sounds outside at the package unit. I'll mention it - hopefully he'll have a method to seal it up if it's a leak.
10-09-2012, 09:39 PM #47
After the brain surgery, biopsy the tissue removed and rejoice at the money saved not testing BEFORE going under the knife? Doesn't any of this sound out of order?
Certainly he's not coming to your home expecting to profit...(?)Which makes more sense to you?
CONSERVATION - turning your thermostat back and being uncomfortable. Maybe saving 5-10%
ENERGY EFFICIENCY - leaving your thermostat where everyone is comfortable. Saving 30-70%
DO THE NUMBERS! Step on a HOMESCALE.
What is comfort? Well, it AIN'T just TEMPERATURE!
Energy Obese? An audit is the next step - go to BPI.org, or RESNET, and find an auditor near you.