Residential Evaporator Coil Types (A, N, Slab, V)

[@devnull7550]

Thanks for the fantastic explanation! I have a system where the installing contractor made the mistake of swapping a cased N coil into the old evaporator's case. So much air bypasses the coil that the system only operates at 2/3 of its rated capacity. I realized the mistake the contractor made as soon as I removed the cover for a look, but I didn't know this was a common mistake until I saw your video.

[@ParabellumX]

They turned an A-coil upside down and called it a 'V-coil'. 😭😭😭🤣🤣🤣

[@heythere6983]

So I’m a bit confused with coils . Are there 2 sets of coils? Ones in the outdoor ac unit and then ones inside near the furnace ?

[@TECTubefilms]

correct

[@mohammadalshaikhhasan5091]

A coils with down air flow, have always a problem with condensate water cary over. . How to be solved?

[@syedkhader8126]

Sir I fusing one same problem in our rheem air conditioner evaporator coil is 50% only cooling what's problem please help me sir thanks

[@FlyEaglesFly19111]

I guess if your mix matching equipment incase coils work.. otherwise I always go for cased coils to mate better with a gas or oil furnace.

[@TECTubefilms]

We agree. Cased look nicer and generally have more predictable airflow patterns. But sometimes you need to jam something in where it doesn't really fit all that well... then uncased might be the solution.

[@Jason-wc3fh]

Oil furnace's require a higher clearance off the supply. If it's a drum style oil furnace, you need a minimum 6" above the furnace, and a bit less with the higher efficiency oil furnaces... Either won't look too great with a cased coil spaced out with a transition from the furnace. Cased coils always look best when on a gas/electric furnace mated right up against it.

[@TECTubefilms]

@@Jason-wc3fh We will take your word for it. We don't use oil furnaces here in the Chicago area. It is all natural gas with occasional propane when you get about an hour and half away where it is rural.

[@jennyluvsjapan1]

So I did put one of these cased N coils into a plenum. I took it out of the case and slid it in. Now the coil is turning into a block of ice… Can I just pull the coil back out, and add a piece of sheet metal over the right side like the uncased N coil making my own baffle ?

[@esadbajramovic1954]

I’m having the same issue. Would love a response, what did you do?

[@vaporition]

Do yall do custom coils ?

[@TECTubefilms]

For residential applications, no. For commercial, we have supplier of custom coils.

[@MegaAirtel123]

Are V coils out for the customers in Canada (Toronto market) ? Is it inverted "A" and or all together new technology ? Is it for the vertical upflow application and does it comes for uncase option ?

[@TECTubefilms]

We are not familiar with which areas in Canada have had these already. We had it here in the Chicago area for 12 months as a limited release and now this summer it should be released to all of the US and Canada.

[@MegaAirtel123]

@@TECTubefilms Thanks for info. I got in touch will Carrier dealers here in Toronto and I have pressed them hard for V coil. To be very frank, these sales guys of Carrier have little technical knowledge and doesn't know anything, their only target is just to increase the sales numbers, they don't care what customer want. And another down side of it is that the Carrier call center are also not capable of answering technical question. Anyway when I pressed the sales guy hard one of the dealer comes up with 3 Ton V-coil with 2.5 Ton condensor, saying 2.5 ton V coil is not available in warehouse (I don't know whether in their WH or Carrier WH). My actual requirement is 2.5 Ton AC for 2300 sq ft house. Now my question is the mix match - 3 Ton Evaporator with 2.5 Ton condensor OK ? Will it increase the cooling and on the con side will it be affecting the condensor in any way? The other question is that will this mix-match voids the warranty ? the Carrier sales guy is saying that the mix match is Ok and the AC will perform more cooler and with less humidity with 3 Ton Evaporator + 2.5 Ton condensor combination. Please give your expert opinion. Thanks

[@TECTubefilms]

@@MegaAirtel123 As long as a specific 3 ton coil and a 2.5 ton condensing unit model are listed together in the AHRI directory as a rated combo, there will be no warranty issues because that means it is an officially approved combination by the manufacturer.

[@TECTubefilms]

@@MegaAirtel123 We just spot checked some ratings for Carrier 2.5 ton units with V coils and using the 2.5 ton or 3 ton coil has no significant difference on total cooling capacity. We do believe that it could have a slight improvement in latent capacity (dehumidification) although there are many other ways to improve dehum ability more significantly (less oversizing of the condensing unit, lower CFM, more stages, thermostat control of dehum, etc.)

[@jennyluvsjapan1]

Are the N coils up flow, and Down flow ?

[@TECTubefilms]

There is one model for vertical, which is used in both downflow and upflow applications. Then there is a different model for horizonal.

[@pingpong9656]

If you are starting with a new system that includes a gas furnace - which is the absolute best option to pair with the gas furnace? Will the cased units always match the output duct size or do you have to add a reducer/expander duct in between?

[@TECTubefilms]

There are different options for different applications so it is hard to say what is "absolutely best."

[@TECTubefilms]

Cased A, N, and V coils are available in the same widths as furnace cabinets.

[@realestateservicessaleshea99]

Thanks🥃

[@bryanviper]

Which would allow more airflow A Coil or N Coil? So I guess which is less restrictive? Thanks

[@TECTubefilms]

Each model is different, but generally N coils have a high pressure drop. In fact, Carrier is phasing-out N coils and switching to the newer V coils for this very reason.

[@bryanviper]

@@TECTubefilms Interesting, I have an old AC system 30+ years old and eventually when it dies I will need to replace it all. My HVAC tech suggested N coil for increased air flow to the top floors (older house and smaller ducts) instead of a regular A coil. But these V coils look interesting and could be a better solution. Thanks

[@TECTubefilms]

@@bryanviper Very rare that an N coil would be less restrictive than an A coil of the same width... in fact we have never seen one yet

[@TECTubefilms]

@@bryanviper Also, replacing your evaporator coil requires the tech to cut into your refrigerant lines and then re-charge the system. If you are doing all that, you may as well replace the condensing unit outside. It is not that much more labor to do so.

[@bryanviper]

@@TECTubefilms Yes I would have a Tech come out and replace the unit outside and A coil. Odd as a company suggested I go with N coil for more airflow vs an A coil. But i'll have to look into the new V coils they seem like the best solution for airflow/ less restrictions.

[@hermanrogers1325]

Are they made in China

[@TECTubefilms]

No, they are not. We believe most models are made in Indianapolis.

[@tommason5689]

Why don't they make A coil such that it is easy to clean the underside above the heat exchanger without having to discharge the refrigerant and remove the whole evaporator? It needs to be cleaned every year and yet they designed it so that it is practically impossible to clean without disassembling the whole evaporator and reassembling it, which is a very big job that service men have to deal with and cost so much for the consumers. What is also crazy is the fact that they designed the HVAC system so that furnace heat has to go through the evaporator during the cold weather when AC is turned off, which restricts air flow and aggravates dust accumulation on the evaporator as well. This is plain stupid to me. What I do not understand is why HVAC manufacturers have not addressed this problem until now. V coil is a step in the right direction since dust will collect on the top side which can be cleaned without disassembling the whole evaporator. I am not sure why this idea was not used decades ago.

[@TECTubefilms]

V coils are not new. Carrier had a V shaped evap coil back in the day. Lennox in the 1970s. And some other lesser known brands.

[@TECTubefilms]

In terms of making A coils easy to clean, what specifically do you suggest as an improvement. Note: whatever your suggestion is, it cannot increase the vertical height of the coil.

[@TECTubefilms]

We would also like to hear your suggestions to separate the airflow paths of the evaporator coil and the gas heat exchanger. Are you proposing two separate duct and fan systems for the house? Or are you suggesting a single fan, two internal airflow paths thru each heat exchange medium, and backdraft dampers (note: this will double the width of the air handler)

[@ryanhoger1]

Why are you cleaning the evaporator coil every year? If you use relatively high MERV filtration (with tight fit to filter cabinet), not much gets on the coil. I have not cleaned mine for 9 years and it still look good (no visible growth or films... and no measurable pressure drop difference). I do clean my condenser coil periodically... every 5 years or so.

[@tommason5689]

@@TECTubefilms Design it such that the cover can be easily opened to access the underside. Or make it easily removable.

[@flaman1967]

Because of Biden,I have to sweat.

[@johnm5379]

What kind of hillbilly horse shit logic is this?

[@chuck7879]

@@johnm5379 Same logic as everyone blaming everything under the sun on Trump. You have this on both sides

[@crinklyten2152]

V coils are garbage.

[@TECTubefilms]

We have had great success with V coils since we used them during the pre-production phase and then again when they officially hit the market. We have literally used thousands in our market. We have witnessed improved airflow and lower warranty claims. At the risk of opening Pandora's Box, what bad experience did you have?

[@crinklyten2152]

@@TECTubefilms drain pans are too narrow and easily plug up unlike a conventional “A” coil pan. Air flow good but very little difference between “A” and “V”coils. For the potential clogged pan and plugged micro channels I much rather have an “A” coil.

[@TECTubefilms]

@@crinklyten2152 We also prefer A coils! The V coil is best used when height is an issue.