3 Port Valves and Y Plan Heating Systems – Plumbing Tips

Posted on: June 29, 2017 by in Plumbing Videos
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3 Port Valves and Y Plan Heating Systems – Plumbing Tips


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This video covers the 3 port valve. In particular it’s position in a Y plan system. We also cover the basics of installing or replacing a three port valve or head. For more information visit http://www.plumberparts.co.uk

Hello, and welcome to this PlumberParts video.
Today, I’m going to tell you about three port valves, their position in the heating system, and how to install their control heads. It’s basically going to be a brief explanation, if you want any more detailed information you’ll have to contact us and go to our website at plumberparts.co.uk.
Let’s first have a look at the position of the three port valve in the heating system. This pipe here is the flow from our boiler, okay? Now it comes up here, through the pump, is pumped up through this pipe here to our three port valve here. Okay? Now what the three port valve then does is divert hot water, either through here into the coil of the hot water tank and back out to the boiler, of through here, which is off down to the heating system, okay, to the radiators. Now it does that according to whether it’s being controlled by either the thermostat on the side of the tank for this side, or your thermostat in your room, which will send it off down this side. Now that might sound simple enough, but the complication comes in when you try to wire them in. For most heating engineers like me, or other people who are experienced in this, it’s an easy thing to do, but if you don’t know what you’re doing, you could easily get an electric shock, or the system just won’t work properly at all. Now, only do this if you know what you’re doing, and you’re competent with electrics, okay, and you have a tester. For God’s sake, don’t touch anything that you haven’t tested first, okay? So here’s the control box, I’m just going to remove this cover. Right, so that is why, you take the cover off and you look at that, and just think oh my God, what is going on here? But once you isolate each wire, and find out which, what it does, then you’re in a much better position, okay, and you’ll be able to figure it out a bit easier with any luck. Now we’re going to have a look at this. This is our replacement head, okay? But I’ll tell you what these wires do, and basically how this works, okay? Because sometimes they can be confusing, the three port valve type, because when it’s only on heating, it has to have a separate live that keeps the boiler and the pump on, okay? Now, so what we have here is pretty simple, we have our standard wire here, this is our earth wire, that goes into the earth. This is our neutral, okay? Now these two here are our signal wires, okay? Now, on a two port valve you have a live, earth, and a neutral, okay? And then a switch live and then a switch down, okay? So when, what happens is, is your two port valve is livened up, the motor moves round, clicks the switch, and then it turns that switch live on back to the boiler and the pump. Now, with a three port valve it’s a bit different. You’ve got your live, your neutral, and your earth, Okay, right, and then you have a live on, you have two lives here, okay? Now these get livened up according to what services you’re looking for, okay? And they also move the motor round, right, so say your white is your hot water and your heating is your grey, okay? Say the white moves round, the motor moves round, and then what it does, it switches the live that goes through the white, through the motor, and then back out on this orange off to the boiler and the pump, right. Similarly, it works exactly the same way for the heating system. Say it comes down, the heating system comes on, it gets signalled by the programmer, it goes through the thermostat of the room, comes back, switches down here, opens the valve, the valve makes, and then it livens up back down here off to your boiler and your pump to tell them to come on. The idea of having a switch in one of these motors to tell the boiler or the pump to come on, is so the boiler and the pump doesn’t run when there’s no flow to go to, okay, which could result in the boiler overheating, sections cracking, heating systems overpressurizing, and loads of problems like that. Okay? I hope you found this video somewhat informative and opens your eyes a little bit more to how three port valves work, where they are on the system, and why they’re so important for diverting heat to the certain areas according to the thermostats that are calling for those areas to have heat. If you want any more advice or any more information, go to our website at plumberparts.co.uk, message us on youtube, or get hold of us through that website. Hope to see you again, and keep up to date with us, and see you soon. Thanks very much, bye bye. Plumberparts.co.uk, honest reviews and advice.

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