01-26-16, 03:57 PM | #11 |
Supreme EcoRenovator
|
Groovy. With your choice of power supply (wall wart, piggybacking off 24 VAC power, or my favorite, a USB power adapter), a 4 way relay module will do the job. For the control switching of 24 VAC power, you could use one based off ss relays. If you are planning to run some equipment directly, that's a different story. Your 4 relay outputs would be w, y, w2, and o.
|
01-27-16, 06:26 AM | #12 |
Apprentice EcoRenovator
Join Date: May 2011
Location: Tortosa, Spain
Posts: 221
Thanks: 2
Thanked 81 Times in 46 Posts
|
Hi,
ok here is a new version based on my understanding of your description. It comprises of: 1. A relay module that switches either the combined Y+O (for cooling) or W for heating to a common source (from your description I'm not sure if the common is 0V or 24V but it should be irrelevant) 2. An SSR to turn on/off the heating element in the electric boiler 3. A DPDT relay to switch between HP or Electric boiler (I guess this runs the boiler pump). You'll need to build a bit of circuitry for it. You could also use the boiler contacts to feed power to the heater element (via the SSR) for security. 4. 3 temperature sensors, tank, inside, outside. 5. Display and keyboard for programming The Arduino will work from a 12V supply so you'll have the 12V needed for the DPDT relay. Have I mis-understood or missed anything? |
02-07-16, 08:20 PM | #13 | |
Master EcoRenovator
Join Date: Aug 2012
Location: Toronto
Posts: 958
Thanks: 40
Thanked 158 Times in 150 Posts
|
Quote:
|
|
02-07-16, 08:25 PM | #14 | |
Master EcoRenovator
Join Date: Aug 2012
Location: Toronto
Posts: 958
Thanks: 40
Thanked 158 Times in 150 Posts
|
Quote:
I'll put my meager brainpower to this again shortly, haha |
|
02-09-16, 11:04 AM | #15 |
Master EcoRenovator
Join Date: Aug 2012
Location: Toronto
Posts: 958
Thanks: 40
Thanked 158 Times in 150 Posts
|
OK, here is a simple relay drawing.
What is important is that the control need only turn on the heat pump through the pins on the left. 24vac comes from the HP, to the relays controlled by the arduino and the the arduino needs to determine which pin to apply power to and at what outdoor temp. As noted before, below 17C (for example) the system will be in heat mode and over 25C, it will be in cooling. I think temps need to be sustained for some period of time ( perhaps 12 hrs?) before a switchover to allow for hot days and cool nights. I hope this helps. Acc on R1 is the arduino output that turns off the HP and turns on the electric boiler when outdoor temps are below -15C. |
02-10-16, 01:50 AM | #16 | |
Supreme EcoRenovator
|
Quote:
|
|
02-10-16, 05:46 AM | #17 |
Master EcoRenovator
Join Date: Aug 2012
Location: Toronto
Posts: 958
Thanks: 40
Thanked 158 Times in 150 Posts
|
That's the kind of thing I like to hear. wish I could be more positive about my own programming abilities. Oh well.
|
|
|