I just looked up the manual on your Hayward H400FDP. It operates the same as my RayPak 406A. The Hayward outputs a 24VAC signal and you can use a dry relay to switch between pool, SPA or Off. Because there are three states, you'll need two relays. One to enable the heater mode, and one to select between Heat/Pool temp. The temperature has to be hardset out of band and can't be controlled via remote.Has anyone tried connecting via a serial connector to a Hayward Pool heater. I would rather just send a signal to the heater on what temperature I would like it rather then power cycling the heater off an on.
Haha...true.See what happens when a EE retires!.
Fred...that would be a major, major change for me, haha. Throw out my acid stenner pump and buried tank, redo my software, some of my hardware, and STILL have to worry about dosing/measuring the CO2 precisely.I wonder if you could use a CO2 tank for acid instead? It's pretty cheap to have a 20# tank refilled..
Thanks! When I read this, I thought...so THAT's the correct terminology: dual pole / single pole / 2nd pole. When I worked as an EE, I worked at the transistor level and we didn't have these kinds of relays, haha. Cliff, this project is slow going but my goal is to have feedback wherever possible. In this case, when I control a Stenner pump, I want to:Wow! So you're using a dual pole relay to switch a single pole (120V) device and using the 2nd pole to confirm the relay setting. That's a great idea!
I can confirm that due to a programming error I had power going to both sides of my intermatic actuator for a while and have not noticed any ill effects.Looks good, but it turns out that you can power both sides at the same time. The Intellivalve actually requires that since it needs power all the time. I dont remember what happens exactly when you do it but I think actually nothing. When I want to move my valves from one position. I apply power to the other side, and shut off power to where the relay was. I happens very quickly but for a split second there is power to both sides.
I believe this is how the IntelliCenter applies power to the valves.