Powerful 24vac solid state relay for High-Risk Applications
Reliable 24vac solid state relay Designs for Commercial and Industrial Applications
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24vac solid state relay circuit
24vac solid state relay schematic
24vac solid state relay diagram
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Scott S asked I need 24vac to turn into 120vac?
I have a water flow in our boiler that turns on when it needs water, that is 24v. But I have a main pump that constantly runs which is 120v. I want to turn off the main pump and to only come on when the boiler needs water. Besides the 120:24 transformer what else should I use?
And got the following answer:
Whether or not cutting off the pump is a good idea depends on the installation (sparky's concern) - if he's right and it's a continuous-loop hot water system, you don't want to turn off the pump. Assuming that you really do want to turn off the pump, the people here who recommended a relay are correct. You absolutely do NOT want to try to run a 120V pump from a 24VAC supply that happens to be in the control circuits for the boiler. Such supplies can usually provide an amp or two at most at 24VAC - that's 50 watts at most and I assure you your pump draws more than that. If you wanted to run a 7 watt 120V light bulb this way, that would be ok.. but a pump motor, NO. Instead, use a solid state relay. The Crydom A2410E would be suitable for small loads. It will handle a 10 amp load (1200 watts) and would draw only miniscule current from your 24VAC. But… you have to worry about turn-on surge with electric motors, so use this only for motors up to 3 amps (360 watts) or so. If your pump motor is bigger than that, use the A2425E instead. Manufacturer’s data sheet: http://www.crydom.com/en/Products/Catalog/s_1.pdf A web search for “Crydom” and the part number will turn up a number of suppliers. You just connect the relay's "input" terminals in parallel with the existing 24VAC valve coil. The "hot" side of the 120VAC goes through the relay's "output" terminals, like any other switch. "Neutral" side of 120VAC goes from wall plug to pump motor as always. Let us know if you need a diagram. Use the mounting holes in the relay to bolt it solidly to a largish piece of metal to act as a heat sink, and use silicone thermal grease (available at any hardware store or PC shop) to improve heat transfer there. It's easy and these solid state relays are exceptionally reliable.
The 24vac solid state relay function very well with unique applications that happen to be particular to power distribution and protection. The relays include wide adjustment ranges having a scale that is easy to study either in 3 or 4 digits based on the model. These 24vac solid state relay help in rising the flexibility of the applications, cut down the overall power and upkeep fees. You’ll find relays which are employed for common purposes which are available in reputable styles with rapid replacement solutions. And there are models that are employed for industrial applications and heavier duty applications that function on huge loads. These solutions are made to meet the lifetime industrial manage wants of the applications.
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