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Old 03-31-2020, 11:41 AM   #31
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Re: UV or not?


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Originally Posted by destruct View Post
So, I woudl be looking at something like this?
https://www.amazon.com/Aprilaire-Who.../dp/B00OIV0IVS




Also, given the max static pressure 0.5 IN W.C, what pressure drop is common for the rest of system such as coils,..?
To determine airflow and static, your doing both the supply and return as well as TESP.


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Old 03-31-2020, 01:29 PM   #32
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Re: UV or not?


The max static pressure rating only reflects the maximum pressure the furnace can work against and still deliver rated cfm for cooling.

If the blower is a 4 ton drive/1600 cfm, the static can be higher than that and heating airflow will be okay in this case, provided the heating speed is manually adjusted up.

If it has a 3 ton drive, the static shouldn't be much above 0.5" as most of them can't deliver more than 1200 cfm that.

With a 45 to 75 rise rating, you want to be at the lower to middle end of that range.
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I am not in the business of any trade I give advice on. I have non-professional hvac experience + good knowledge of theory. Attempt repairs at your own risk. Never jump out safeties - especially pressure switches - on a furnace for testing with fuel supply on; use a meter. Do not troubleshoot with live line voltage present unless there's no alternative.
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Old 04-01-2020, 12:08 PM   #33
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Re: UV or not?


I live in the deep south where it is very hot and humid. Last summer the HVAC started causing the "dirty sock syndrome" (recognized name in HVAC industry), and the HVAC dealer sent a tech to clean the air handler coil and re-coat it. Unfortunately, it did not resolve the problem which was actually due to the dealer removing a stretch of steel duct (during a HVAC unit change-out) and replacing with corrugated plastic duct where mildew and moisture can collect in the troughs of the unstretched corrugated pipe. I seriously considered a UV system ahead of the air handler but replacement tube costs are quite high. So I opted for an iWave-R which has no maintenance costs and was easy to install by my new HVAC contractor. The device has corrected the odor problems. During heating and cooling, there are no more objectionable odors which were likely due to mold or mildew. Ozone is not generated only electrically charged ions . Nu-Calgon, distributor, has a video here:
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Old 04-01-2020, 04:20 PM   #34
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Re: UV or not?


How effective are UV lights when they are used for water purification?
If air filters are too restrictive why don't they issue specific guidelines or recommend certain brands and sizes to use?
If the I Wave is so good (I watched the video, it does sound promising) they should put something similar in every HVAC unit. Something that small can't be that complicated.
Maybe Elon Musk can build one for us.
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Old 04-01-2020, 09:26 PM   #35
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Re: UV or not?


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How effective are UV lights when they are used for water purification?
If air filters are too restrictive why don't they issue specific guidelines or recommend certain brands and sizes to use?
If the I Wave is so good (I watched the video, it does sound promising) they should put something similar in every HVAC unit. Something that small can't be that complicated.
Maybe Elon Musk can build one for us.

UV lights are used to treat domestic wastewater effluent to kill pathogenic bacteria before being discharged into a waterway. I used to inspect a POTW that utilized UV for effluent disinfection and it worked well however bulb changes were expensive. In the video, the iWave-R ions kill or disable viruses and the green ones shown are typical of the corona virus family which include the common cold viruses and this current virus, SARS-COV-II which is stalking the planet. If Elon Musk made such a device few could afford it. An iWave-R runs anywhere from $400 to $800 depending on who you buy it from. Last October I paid $435 and my HVAC contractor charged me $70 to install it. I am very glad I have one as my indoor air quality is now very good.



Btw, using restrictive air filters will tax your air handler and wear it out quicker and that will cost $$$$. I used to buy the highest residential MERV rating but no more. I now get a basic MERV 6 pleated filter so I can prolong the life of the HVAC system.
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