Low voltage switching of a pump, on a countdown

In summary, the conversation discusses a problem with hot water not reaching the faucets quickly, and the possible solution of using a valve and timer relay to activate a recirculating pump. The need for a licensed electrician and the suggestion to use a NOTO timer relay are also mentioned. The conversation ends with a mention of the availability of timer relays at local electrical stores or online.
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New member here. This might be the coolest subject for a forum I've seen in awhile (that probably sounds like robot spam). On to business...

I have been scr*wed by a succession of people over our home's improperly plumbed hot water. It takes forever to get hot water to the faucets. I bought a product to fix that. It uses a valve plumbed into the water heater outgoing line to detect movement of hot water, and it then switches on a recirculating pump to push water around the circuit (so turn water on/off, wait a minute, poof, hot water is there). The pump shuts off after 2 minutes. Of course, the electronics soon failed. The company owner is a nightmare, so I am on my own.

The valve mentioned above has two low voltage wires that complete a circuit when the hot water moves. I want to replicate what the product did, by taking those two wires and connecting them to... something... that will switch power to the pump on (it's 110v) when the circuit is complete, and keep it on for 2 minutes.

Thanks in advance for any ideas!
 
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  • #2
110Volts can kill. You need a licensed electrician to install it.

What you need is a timer relay:
http://en.wikipedia.org/wiki/Relay
http://www.allaboutcircuits.com/vol_4/chpt_5/3.html
Presumably of the NOTO type

Your local electrical store will probably have some in stock. They are used to delay bathroom extractor fans to stay on after the light is switched off among other things. If you shop around on the internet you could find cheaper ones. There are over 1300 timer relays ranging from $16 to $2.5k USD here:

http://www.digikey.com/product-search/en/relays/time-delay-relays/1049305 [Broken]
 
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  • #3
billy_joule said:
110Volts can kill. You need a licensed electrician to install it.

What you need is a timer relay:
http://en.wikipedia.org/wiki/Relay
http://www.allaboutcircuits.com/vol_4/chpt_5/3.html
Presumably of the NOTO type

Your local electrical store will probably have some in stock. They are used to delay bathroom extractor fans to stay on after the light is switched off among other things. If you shop around on the internet you could find cheaper ones. There are over 1300 timer relays ranging from $16 to $2.5k USD here:

http://www.digikey.com/product-search/en/relays/time-delay-relays/1049305 [Broken]

Thanks. I've done a lot of electrical work, just none of this type -- I get the dangers for sure.

The NOTO makes sense. I'm not even sure there's an electrical store around. Everyone seems to source at Home Depot now. :-(
 
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1. What is low voltage switching?

Low voltage switching is a method of controlling electrical equipment, such as a pump, by using lower voltage levels than the standard power supply. This allows for more precise and energy-efficient control of the equipment.

2. How does a countdown work in low voltage switching?

A countdown is a feature in low voltage switching that allows for a delay in turning on or off the equipment. This is useful in applications where the pump needs to be turned off after a certain amount of time or turned on at a specific time.

3. What are the benefits of low voltage switching for a pump?

Low voltage switching has several benefits for a pump, including energy efficiency, improved control and precision, and increased safety. It also reduces wear and tear on the pump, prolonging its lifespan.

4. Can any pump be switched using low voltage?

Not all pumps are compatible with low voltage switching. It depends on the design and electrical components of the pump. It is important to check the manufacturer's specifications to ensure compatibility before implementing low voltage switching.

5. How is low voltage switching different from traditional methods of controlling a pump?

Traditional methods of controlling a pump, such as using a manual switch or a mechanical timer, are less precise and may result in more energy consumption. Low voltage switching offers more control and flexibility in managing pump operations, resulting in improved efficiency and cost savings.

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