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27th Apr 2022, 06:54 PM #1Diamond Member
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DIY Evap Aircon Controller for shed
I am in the process in installing a S/H Breezair EXH Evap Aircon in to my shed. (I know is Autumn now, but it will get hot again eventually and I'll be ready! .lol )
I accidently bought a 2nd one with a u/s controller in it. All else is ok, so good for spares.
Been trying to buy a S/H working controller but they are expensive and rare.....I found a repair service and they are not cheap either, although I understand the time and knowledge you are paying for.
(Still a long term option...)
New ones are $720.....too spendy for a shed.
Will try and fix mine, but that's a steep and time consuming learning curve.......Nothing is charred so in with a chance....
Last option is to possibly build my own using relays, timers and push buttons.
I've seen others use Arduinos, but I'd have to learn the coding and it seems fragile for this sort of thing. I want robust and simple!
Would like to mimic the philosophy of the original somewhat, but not hard and fast. I *think* its doable...I found a control circuit simulator and started entering the circuit.
First part (cooling) seems to work mostly.
Still planning but will use a cheap 750w VSD to vary motor speed. Would like to use existing connectors so no wiring mods needed between original and my DIY version.
Will have to mount it close to the roof unit , but not IN it ,if I can help it..... ( a very bad environment of electrics! )
I guess it will keep me quiet for a few months anyway, even if it doesn't work. I do still have a original controller but I'm sure that will fail one day.....they are getting on to 10 years old now.
I don't really have a question.....just spit balling really...lol
Maybe there's a market for something like this...dunno.
Steve
ICON Controller.jpegevaporative_air_conditioning_featured.jpg
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27th Apr 2022, 07:46 PM #2
Show us the guts of it.
I don't have any first hand experience with it, but knowing roughly how they work has me thinking that there is a water pump, a water reservoir (and probably a float switch), and a fan speed controller.
Pump may have multiple speeds?
Float switch would be easy to diagnose with a multimeter.
Fan speed controller would probably be an off the shelf job at an AC wholesaler...
If you build from scratch, an IP rated box will keep it all kosher.
If it all gets too hard, put the call out to some HVAC guys who rip those sort of things out for a ducted install... you may get scrap price for a replacement module.
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27th Apr 2022, 08:12 PM #3Diamond Member
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I always worried that a swampy would make a workshop too humid/rusty.
P.S. One of my neighbours left his hot dip tank on overnight a few weeks back.
Every machine thoroughly coated with rust. He spent a few hours with the phosphoric today,
to get enough rust off the camshaft grinder so that he could use it
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27th Apr 2022, 08:16 PM #4Most Valued Member
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Is this the remote controller?
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27th Apr 2022, 08:23 PM #5Most Valued Member
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27th Apr 2022, 08:53 PM #6Member: Blue and white apron brigade
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Arduinos are a lot more rugged than people think especially if you hard wire the connectors although I've never bothered.
I have 5 Arduino things running in my shed and while the Arduino side of this works fine it's the sensors that seem to be the problems.
A CO, VOC, temp/humidity monitor - this ran for 3 years continuously before the cheap CO sensor died (I was surprised it lasted that long).
I originally installed it to stop asphyxiating myself when I had the gas forge. These days it tells me if I'm using too much meths while machining Al
I replaced the sensor with another cheapie and it's run for 2 years no problems at all - if this sensor dies I will simply replace it - maybe with a more rugged one.
The Temp/Humidity monitor on the compressed air line has run continuously since 2019 - no problems, It has 3 temp/humidity sensor on it all work fine. The only one I had probs with was the sensor under pressure until I worked out how to manage that.
The 4HP dust extractor has a press/temp monitor on it that was installed in 2019 - Pressure side works fine but I still have a motor temp sensor problem while the VFD is running the motor . This been identified as due to noise from the 4HP VFD. If I keep the temp sensor away from the motor it works fine.
The compressed air line auto venting system for the 3 solenoids that vent water from the compressed air line are driven by a basic Arduino. This ran fine some for about 2 years and then the timing started to go a bit wonky and it sometimes locks up I just push reset to get it going again. Have traced the problem to the separate real time clock module - I'm just to lazy to replace it.
Dust particle/counter - ran 24/7 since 2017 until in 2020 I left it too close to a source of dust and it sent the sensor haywire, replaced sensor and located it up up out of the way and all good since.
Also have my coffee machine on an Arduino and VFD. Pressure side worked fine but have had problems with unstable accurate temperature monitoring. Again cause by VFD noise Sorted by brute force programming. This gets turned on every day at around 5am and goes off around 6pm.
Although I have decades of coding experience most (90%) of my basic coding is cadged from the web.
If all you want to do is monitor temp and humidity and switch fans on/off and change fan speeds then an Arduino program should not be too complicated.
I'd offer to help but it will have to be via long distance as I am socially isolating until the Covid thing gets a bit more under control.
Maybe start by telling us more about what you are trying to achieve.
As I'm already set up to do this ie have heaps of spare arduino boards and electronic bibs and bobs I can probably construct a basic mock up for you quite quickly.
I'm happy to fart around with this while you pursue other pathways.
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27th Apr 2022, 11:11 PM #7Philomath in training
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They are not very complicated at all. The pump runs at constant speed, drawing from the tank (the base of the unit), running water through the pads and down again, collecting in the tank. The water distribution system needs to supply water evenly over the whole pad, so the water can trickle down. A stream of water is inviting carry over, as it's the surface tension of the water on the pads that keeps it being drawn in (as liquid) to the air stream. Too much water and you get 'carry over'. You will know because it is raining inside.The level in the tank is controlled by a float valve. Easy.
The cooler works by drawing air over the wet surface of the pads. Note that the best you will get is cooling down to the dew point. More airflow is more (greater volume) of cool air, not air at a colder temperature. Too much air volume and cooling efficiency will suffer, as to cool the air water has to evaporate off the pads - if there is not enough water for the volume of air then everything just dries out until it gets to equilibrium.
Michael.
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28th Apr 2022, 12:07 AM #8Diamond Member
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Yes, simple electrical components, but the electronics PCB is very busy. Logic is pretty simple too. I just got a simulated circuit working.
Start opens the inlet valve and float switch controls that. Timer delay and Circ pumps starts....time delay and blower starts....Push stop and all stops except drain valve opens long enough to empty tank.
Motor is a 3 phase motor so will use a small VSD. contact to start and stop.....remote pot to vary speed.
Steve
PCB.jpg
Have been trying to find someone who will throw some u/s units at me, but no response so far.....Have to talk to the installers but business owners are not very furthcoming.....still trying.
When I say I want to tinker with them they ghost me....lol
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28th Apr 2022, 12:09 AM #9Diamond Member
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28th Apr 2022, 11:14 AM #10Golden Member
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You could always wire up a control panel with toggle switches for all the functions and then bring in the human computer to operate them - the first house I bought had a Bonair swampy installed - it had 3 controls - pump on/off - fan on/off and fan speed, it was that simple. As long as the humidity was low it worked very well and was used every summer for over 25 yrs until we knocked the house over to rebuild, and my mate took the Bonair and installed in his repair shop. Our son has a modern swampy with a fancy automated controller, however he still needs to get up on the roof once a year to clean the tank and check for blocked feed pipes and put the filter pad covers etc.
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28th Apr 2022, 11:53 AM #11Diamond Member
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Yeah, have seen those. Mine is a little more involved.( not much )
Need to let water in before the circ pump starts and open drain for a time after Fan stops. Also my motor is not a 2 speed like the old Bonaire's. Mine is a 3 phase motor.
Original uses chopped DC at varying frequencies ( I think ) to vary speed. I'll used a VSD.
Steve
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28th Apr 2022, 07:27 PM #12Senior Member
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You sure its a 3 phase motor. Most Breezair units Ive worked on are single phase except for large commercial ones.
is this same motor?
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28th Apr 2022, 10:00 PM #13Diamond Member
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Nope...pretty sure. Will have to prove the concept before I get too deep.
Breezair Motor.jpg
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28th Apr 2022, 10:16 PM #14
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29th Apr 2022, 12:38 PM #15Diamond Member
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Apologises Sparksie.....I think I have 'oopsed'
Yes, its a BLDC motor. I read 'star' and thought '3 phase motor'.
I might be sunk.....
https://www.monolithicpower.com/en/b...shed-dc-motors
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