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stbenjamin
05-10-2014, 09:46 AM
Setting up our glycol this week and we were planning to get 24vac solenoids. I thought Ranco made something that would work but it seems while they have a 24vac input, everything outputs 110. Is there a controller that does what I want or should I get a 110v solenoid?

Ray Hodge
05-10-2014, 05:51 PM
It is possible to find controllers to do what you want, I got one example from OMRON site, but there are others, and I could look and see what we have on our panels. The 24 ac is good, but in the new plant I got the actuated ball valves and used Honeywell components on the tanks. I am very happy with the replace ability of the solenoid coils and the manual open option and the 24 volt saved a lot of money on install.
https://www.ia.omron.com/products/family/3370/specification.html

AnthonyB
05-10-2014, 06:42 PM
A relay rated for 110vac will work for 24vac.

Starcat
05-11-2014, 06:24 AM
The control in question switches a set of SPDT contacts and will be rated for several voltages up to a certain limit on those contacts, usually 250V. The power supply that is " switched is not necessarily the same as what powers up the control. Those are separate circuits essentially even if the power supply is parallel.
You do not need a relay.
You implement a 24V transformer for the controlled loads and wire accordingly. Your Ranco or JCI will either be designed for 120-240VAC input or they can be gotten in 24 VAC. but you will need 120 for the primary side of your transformer regardless.
Some understanding of wiring diagrams and how the controls operate is helpful in doing this kind of setup.

stbenjamin
05-11-2014, 10:56 AM
I wasn't planning on having a relay, just a controller that switched on an ASCO red cap solenoid. I need them installed later this week and will order everything tomorrow. My question is if I get a Ranco controller, which people have given good feedback on in this forum, can it be used to switch the solenoid on and off, and what version of each do I need to use? Due to shipping times and what is available, as well as price, I am trying to make this set up work so other controllers aren't what I am looking at. I'd prefer not having to add transformers, so if I need to make everything 110vac I'll do that.

Starcat
05-11-2014, 11:21 AM
If you want 24 Volt servos, you need ONE transformer only. 60VA should be adequate.
Otherwise you order your Red Hats with 115V coil and run everything at 115V - Control Power and Switched legs.
The transformer shown bottom left is an example of the type that can be used. 115V Primary - 24V Secondary.

stbenjamin
05-11-2014, 12:23 PM
Thanks, it looks like in order to get up and running quickly I'll stick with 115v. Plus now I can run with my old homebrew Rancos

AnthonyB
05-12-2014, 10:35 AM
Most Ranco controllers are a simple processor built around a mechanical relay. For example, the ETC-112000, is an LCD, some EEPROM, a microprocessor, and a relay. The control in question is the relay and my previous comment was meant to imply that since it can switch 110vac, it can switch 24vac.

Ultimately, if you want to save some money, you can use more simple motorized ball valves and very simple controllers, search ebay for:

'DIN25 motorized ball valve'

and

'110v aquarium temperature controller'

ProStarter
05-12-2014, 05:42 PM
Johnson A419 controllers are available in a 24V version and both the controller and solenoid can be powered by a simple 24V doorbell transformer.

Swags
06-20-2014, 12:03 PM
The control in question switches a set of SPDT contacts and will be rated for several voltages up to a certain limit on those contacts, usually 250V. The power supply that is " switched is not necessarily the same as what powers up the control. Those are separate circuits essentially even if the power supply is parallel.
You do not need a relay.
You implement a 24V transformer for the controlled loads and wire accordingly. Your Ranco or JCI will either be designed for 120-240VAC input or they can be gotten in 24 VAC. but you will need 120 for the primary side of your transformer regardless.
Some understanding of wiring diagrams and how the controls operate is helpful in doing this kind of setup.

My electrician has been really unhelpful so far so I'm looking for another one. In the meantime, I'm in need of a little help getting the wire / circuit layout in my head just to keep moving forward on the material purchasing.

I just purchased 24VAC versions of Johnson A-419s and the 24VAC Asco red hats. I have 120V outlets near the fermenters. I'm planning to purchase one 24VAC transformer. Should the solenoids be wired directly to the transformer Or, do the 24V wires go from the transformer to the controls first and then on to the solenoids?

Also, must the 24V wires be in conduit?

thanks for any advice.

Thirsty_Monk
06-20-2014, 05:27 PM
Output from your Johnson controller is most likely 24V. Just be safe, check it with meter.