Slowitdown
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Maybe your not losing it,Sounds like your regulator is constantly on to blow through a tank in 12 hours (should only run at lights on) but 2000 sq ft is alot of space,my rooms are only 150 sq ft ea sealed and i use a 20lb tank every 5-7 days so for 2000 sq ft your not doing bad at all.In a room that big id think you might have a few bottles going in different parts of the grow.What PPM are you trying to achieve and does your room ever reach that point all over?
Post in cannabis johns AC thread and he will give you the low down on the return air.
https://www.thcfarmer.com/community/threads/grow-room-a-c.46645/
some of those all-in-one RTU's are designed to use partial outside air to freshen the workspace. some of them use 100% outside air, with no return air at all .
you had these units installed or someone gave you the specs on existing? A pix or model number would help. Sometimes there's a small port that "mixes" in fresh air..other ones have what is called an economizer..uses dampers to regulate mixed outside air in as a fuel saver. If you have none of those..you have fan coil unit..basic bare bones filter, coil, and blower.Neither of my units bring in outside air. If that was the case I would of never put the return ducting in the same room.
you had these units installed or someone gave you the specs on existing? A pix or model number would help. Sometimes there's a small port that "mixes" in fresh air..other ones have what is called an economizer..uses dampers to regulate mixed outside air in as a fuel saver. If you have none of those..you have fan coil unit..basic bare bones filter, coil, and blower.
Hard to say anything certain without knowing what the unit actually is. Other than that..is there a duct leak somewhere..or the air handler covers loose? Bad CO2 regulator? That's about all I got
If its a newer unit it probably has makeup air coming in somewhere.here in michigan makeup air is code and they are getting really bad about how big and how close to the air handler it needs to be.its more for the combustion side of a handler or furnace, but maybe your rooftop unit has it built in somewhere? Unless the fans or air handlers are inside the room I doubt its airtight, much like a window shaker where they exchange some outside air.
I've seen those in a restaurant I built..for the grill hoods..man those hoods can steal your hat. Make-up is mandatory. Alot of the older units use fresh air..the bigger the unit the more likely it does. The new Fan Coil Units are pretty slick..even on the furnace side..you can use 4" double stack and can be inside with absolutely no make-up at all.If its a newer unit it probably has makeup air coming in somewhere.here in michigan makeup air is code and they are getting really bad about how big and how close to the air handler it needs to be.its more for the combustion side of a handler or furnace, but maybe your rooftop unit has it built in somewhere? Unless the fans or air handlers are inside the room I doubt its airtight, much like a window shaker where they exchange some outside air.
I had the two rooftop units installed new. One of them is 4 tons the other is 3. I will have to find out the model # and stuff or take pics to show. My hvac guy who installed them is the one who told me the air in the room is sucked out cooled and then dumped right back in like its going in a circle but never leaving the room. That could be a duct leak like you said or the regulator could be bad. The regulator is brand new but I was thinking something when I hooked it up to a fresh tank and it said the gas in it was low. I am not fully sure though. One of the units looks like this -
Yeah or like you and he both mentioned, maybe that co2 controller is badI've see in a restaurant I built..for the grill hoods..man those hoods can steal your hat. Make-up is mandatory. Alot of the older units use fresh air..the bigger the unit the more likely it does. The new Fan Coil Units are pretty slick..even on the furnace side..you can use 4" double stack and can be inside with absolutely no make-up at all.
I think the answer here is that he's gonna need some big mini-splits if he wants to keep that CO2.
Yeah or like you and he both mentioned, maybe that co2 controller is bad
How high are the ceilings in your 2000 sqft grow, and is this your first tank, is your space completely sealed from top to bottom for sure. If it is your first tank you will need to saturate the entire volume of air in your grow space. Any wholes or leaks near the first few feet of the floor will leak like a bucket with holes in it.
Your other space 400 square foot 8 foot ceiling 400 x 8 = 3200 cubic feet 1 tank 21 days
Your current large space 2000 square foot 8 ceilings 2000 x 8 = 16000 cubic feet 16000 / 3200 = 5 so you should be using 5 tanks in the same time frame that your 400 sqft uses 1, and for every 1 foot of ceiling height over and above 8 feet you can add another a little over 2/3rds of a tank every three weeks.
You should be going through a tank every four days
Or everything is okay and you have no leaks and you are growing in an area with 30 foot ceiling's ;)
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