Diy ATU wiring

[aquaman1]

Hi guys

Considering making my own Atu. Just need some advice about the wiring and equipment to purchase.
Below is the relay and float switches I intend on buying, are these suitable? Also want to have 2 switches wired for a backup. Thanks

 

[Dexter]

i use a normal ro diaphram pump and two float switches connected in series.

 

[aquaman1]

i use a normal ro diaphram pump and two float switches connected in series.

Ok so you don't tun it with a relay? Just read up that it will be safer.

 

[viper357]

Looks like it may possibly work, do you have a wiring diagram for it?

 

[aquaman1]

Looks like it may possibly work, do you have a wiring diagram for it?

That's kinda what I was looking for haha

 

[Frank]

As you only have one input, wire your float switches in Parallel if you want a backup or in Series if you are looking for 2 out of 2 security. For ATU application ,parallel would be better option. Have you worked out your final cost? After you have bought the board, float switches, 12 volt power supply, housing etc you are prob better off just buying a proper ATU with all the additional features like High level alarm and hysteresis settings etc.

 

[aquaman1]

As you only have one input, wire your float switches in Parallel if you want a backup or in Series if you are looking for 2 out of 2 security. For ATU application ,parallel would be better option. Have you worked out your final cost? After you have bought the board, float switches, 12 volt power supply, housing etc you are prob better off just buying a proper ATU with all the additional features like High level alarm and hysteresis settings etc.

thanks will look into this, however even with buying all the items it still ends up being considerably less.

Any idea if a solid state relay has to be used?

 

[Frank]

Your board has a relay fitted with a contact rating of 10 amp at 250 volt. You can drive a pump off that directly.

 

[Frank]

Just wire a switched socket to the output of your relay.

 

[Frank]

Here is a very good water level controller available on the German Amazon site from H-Tronic. Half the price of any commercial aquarium orientated top up. I am using one of their range to control my RO /mixing station and works perfect. You can check out their range of controllers on their website, but the price is better on Amazon.de. Remember here you get to set a maximum run time of the pump which in my opinion is a must. Without it you risk dumping all your top up water in your reservoir into your sump in the event of a sticky float switch.

 

[Frank]

 

[aquaman1]

Thanks a mil @Frank. That definitely simplified it. Will let you know how it goes

 

[Frank]

No Problem. I showed the switches in series. On second thought that way would be more secure and you could even mount one float slightly higher as a backup to the other.