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Post by Deleted on Sept 24, 2016 17:17:03 GMT
Something you may also come across rocky is a shared feed and expansion pipe so you just have one pipe doing two jobs.  The idea of the first two tees before the pump is that is the most negative part of the circuit and once you're past the pump it becomes positive. When people install the CH return in after the cylinder we call this reverse circulation. |
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Post by dickpuller on Sept 24, 2016 17:40:48 GMT
Great video as always Tom & explained very well.
Sorry to be a pedantic prick, but around 10.01 on the video when you show the 'Common Return' I think you've drawn the CH as the first tee(branch) & the HW as the end on.
Forgive me if I'm wrong.
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Post by battle1066 on Sept 24, 2016 17:45:34 GMT
Something you may also come across rocky is a shared feed and expansion pipe so you just have one pipe doing two jobs. The idea of the first two tees before the pump is that is the most negative part of the circuit and once you're past the pump it becomes positive. When people install the CH return in after the cylinder we call this reverse circulation. I thought that was only done after the cold feed had choked up with crud from the F&E tank as a method of quick fix to get the system up and running as a method of filling the boiler? |
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Post by rocketmanbkk on Sept 24, 2016 17:55:54 GMT
Cheers all
It'll come to me & then I'll
Be thinking what's all the fuss about!
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Post by crowsfoot on Sept 24, 2016 17:56:00 GMT
Combined feed and expansion.
This was also a trick that that same gaffer would have us do back then to save on copper pipe (tight arse)!
I do remember him showing us a letter from corgi telling us not to do this practice.
When the system was boiling/expanding the system was unable to take in water to replenish itself (I'm pretty sure that was the reason).
A very common practice in the 70s it was!
Plumbers were very innovative back then.
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Post by tomplum on Sept 24, 2016 17:59:45 GMT
Great video as always Tom & explained very well. Sorry to be a pedantic prick, but around 10.01 on the video when you show the 'Common Return' I think you've drawn the CH as the first tee(branch) & the HW as the end on. Forgive me if I'm wrong. If I'm reading you right dick, the HW return can join in anywhere in the return in the cylinder cupboard because all of the rad tee's are already joined in that return pipe in the cylinder cupboard, Is that the one you mean ? I know a lot of plumbers don't bring the common return into the cyl cupboard because its easier to take 15mm from the cylinder down to the last tee, thats where mistakes can happen, this way ALL of the tees from the heating are already joined,  |
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Post by tomplum on Sept 24, 2016 18:05:07 GMT
another inovation by a firm i worked for ( servowarm) was the 'no vent' system, they would use a 22mm cold feed, this made it immpossible to suck down and get air in the system, as far as i know there were never any issues with it,
they had some other idea's too, they put the flow to the cylinder in the bottom circ, this made very quiet systems, they also invented the fanned flue, so the boiler had more position options,
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Post by Deleted on Sept 24, 2016 18:36:15 GMT
Great video Tom.  Shame about your drawing skills. laughing-dog-smiley-emoticon |
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Post by dickpuller on Sept 24, 2016 19:25:45 GMT
Great video as always Tom & explained very well. Sorry to be a pedantic prick, but around 10.01 on the video when you show the 'Common Return' I think you've drawn the CH as the first tee(branch) & the HW as the end on. Forgive me if I'm wrong. If I'm reading you right dick, the HW return can join in anywhere in the return in the cylinder cupboard because all of the rad tee's are already joined in that return pipe in the cylinder cupboard, Is that the one you mean ? I know a lot of plumbers don't bring the common return into the cyl cupboard because its easier to take 15mm from the cylinder down to the last tee, thats where mistakes can happen, this way ALL of the tees from the heating are already joined, I was always shown that the HW cylinder return must be the first tee on the common return Tom. If the CH Return was first tee there was a chance of back circulation(heat migration) to the entire CH system. Whatcha think? |
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Post by tomplum on Sept 24, 2016 19:34:10 GMT
I think we're both singing from the same hymen book Dick, my books in English and yours is in Scottish, there's something lost in the translation, My book says third tee out last tee back I know your book will say the same, |
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Post by dickpuller on Sept 24, 2016 19:55:25 GMT
I think we're both singing from the same hymen book Dick, my books in English and yours is in Scottish, there's something lost in the translation, My book says third tee out last tee back I know your book will say the same, I maybe wrong Tom, but it's what you said at 9.10 regarding the common return. I was wrong once before. |
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Post by dickpuller on Sept 24, 2016 19:58:14 GMT
another inovation by a firm i worked for ( servowarm) was the 'no vent' system, they would use a 22mm cold feed, this made it immpossible to suck down and get air in the system, as far as i know there were never any issues with it, they had some other idea's too, they put the flow to the cylinder in the bottom circ, this made very quiet systems, they also invented the fanned flue, so the boiler had more position options, Servowarm had some groundbreaking stuff!! Was there one individual that was so forward thinking Tom? |
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Post by joinerjohn on Sept 24, 2016 20:04:52 GMT
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Post by Deleted on Sept 24, 2016 21:27:08 GMT
Something you may also come across rocky is a shared feed and expansion pipe so you just have one pipe doing two jobs. The idea of the first two tees before the pump is that is the most negative part of the circuit and once you're past the pump it becomes positive. When people install the CH return in after the cylinder we call this reverse circulation. I thought that was only done after the cold feed had choked up with crud from the F&E tank as a method of quick fix to get the system up and running as a method of filling the boiler? It was quite a common installation early on battle. |
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Post by battle1066 on Sept 25, 2016 9:30:50 GMT
How much of the 3Tee rule applies when it's a combi-boiler and not an fully pumped open vented system?
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Shame about your drawing skills. laughing-dog-smiley-emoticon 
