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Central Air Freshner Project
Posted on 5/13/19 at 2:32 pm
Posted on 5/13/19 at 2:32 pm
So, I started a little project the other day of making a air freshner to go in my central air return duct.
I have a small Programmable logic controller from a place I used to work at, so I thought why not put it to use.
I have written a program to sense when the central air fan is on. When it comes on it will cut on a computer fan in a small box mounted in the return duct that has scent blocks in it. Then based on some switch inputs the fan in the box will run for a certain amount of time (1,2, or 3 minutes is what I have it set for right now) and then cut off.
Then when the AC fan cuts off and back on or has been running longer than 30 minutes the program will start over and run the scent fan again.
Think itll be pretty cool when I get finished.
I'm using a broken small ceramic heater that I've gutted for the box. I'll take pics when I finish with it.
I have a small Programmable logic controller from a place I used to work at, so I thought why not put it to use.
I have written a program to sense when the central air fan is on. When it comes on it will cut on a computer fan in a small box mounted in the return duct that has scent blocks in it. Then based on some switch inputs the fan in the box will run for a certain amount of time (1,2, or 3 minutes is what I have it set for right now) and then cut off.
Then when the AC fan cuts off and back on or has been running longer than 30 minutes the program will start over and run the scent fan again.
Think itll be pretty cool when I get finished.
I'm using a broken small ceramic heater that I've gutted for the box. I'll take pics when I finish with it.
This post was edited on 5/13/19 at 4:37 pm
7
Posted on 5/13/19 at 4:09 pm to NATidefan
What type of plc?
Posted on 5/13/19 at 4:27 pm to diat150
It's made by a small company called Velocio.
www.velocio.net
It's their ace 22. 12 digital in, 12 digital out.
www.velocio.net
It's their ace 22. 12 digital in, 12 digital out.
Posted on 5/13/19 at 4:27 pm to NATidefan
It's funny you posted this because I've been thinking of trying something very similar over the last few days.
Posted on 5/13/19 at 4:28 pm to NATidefan
I have to get a AC to DC conveter since the central air fan line is 24V AC
Posted on 5/13/19 at 4:29 pm to NATidefan
I'd use an arduino if I was buying one though, instead of the velocio plc.
This post was edited on 5/13/19 at 4:31 pm
Posted on 5/13/19 at 6:45 pm to NATidefan
quote:
scent blocks
you are way way overthinking this
all you have to do is just toss the scent blocks in, or hang an air freshener, in the r/a shaft and call it a day
no need to reinvent the wheel here
Posted on 5/13/19 at 7:00 pm to keakar
Maybe, but the main reason I want to do it is so I can put like 5 blocks in there and not have to change it out often. If the fan blows over them all the time its gonna be too strong.
Plus in the summer and winter the fan runs alot more than in the spring and fall... so it wouldn't be consistent.
Plus in the summer and winter the fan runs alot more than in the spring and fall... so it wouldn't be consistent.
This post was edited on 5/13/19 at 7:01 pm
Posted on 5/13/19 at 8:03 pm to NATidefan
quote:
Maybe, but the main reason I want to do it is so I can put like 5 blocks in there and not have to change it out often. If the fan blows over them all the time its gonna be too strong
im not talking put it in the unit, you put it in the return air shaft on the floor behind the filter. it fills the shaft with scent when the unit is off and then spreads it through the house when it runs. since its indirect draft it wont use them up very fast at all. in fact it will last longer then in your method.
if your filter is mounted on the ceiling then just add a small shelf inside the box in the top corner so its not in the direct air path
just add a block, or half a block, each month when you clean/replace the air filter
This post was edited on 5/13/19 at 8:04 pm
Posted on 5/14/19 at 7:11 am to NATidefan
This sounds like a solution in search of a problem, but since you're all in already...
If your scent blower is tied to the A/C fan kicking on/off, then you'll have this problem either way. Your box will run more when the A/C runs more, so your house will smell twice as fresh in summer/winter than in spring/fall.
It does sound like a cool idea, if a little excessive.
quote:
in the summer and winter the fan runs alot more than in the spring and fall... so it wouldn't be consistent
If your scent blower is tied to the A/C fan kicking on/off, then you'll have this problem either way. Your box will run more when the A/C runs more, so your house will smell twice as fresh in summer/winter than in spring/fall.
It does sound like a cool idea, if a little excessive.
Posted on 5/14/19 at 7:36 am to NATidefan
I just squirt a little lemon essential oil on my air return filter, house smells like June Cleaver's vagina 10 minutes later
Posted on 5/14/19 at 10:17 pm to ItNeverRains
Posted on 5/14/19 at 10:45 pm to NATidefan
Ozone?
Posted on 5/15/19 at 7:35 am to NATidefan
t you had the PLC but a simple relay setup would be much simpler and easy to customize. JMHO
Posted on 5/15/19 at 10:17 am to NATidefan
I have an automatic air freshener hung near my air return. Use the citrus spray. Gets sent throughout the house and isn't overpowering. I mounted the sprayer to the wall with 2 screws and it just hangs on them like a picture frame does.
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