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Post by Telemachus on Oct 22, 2019 17:47:21 GMT
This is probably a silly question, but could someone please describe the electrical circuit for a thermostatically controlled pump. Ta. The one I ordered probably goes a bit fast. Can I slow it with a cheap pulse width type control? Normally a thermostat just acts like a switch, so you put it in series with the pump. +ve supply to thermostat to pump to -ve supply. If the thermostat is something fancy and electronic, it might be different. You may be able to slow the pump but it depends on the design. Which pump did you order?
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Post by lollygagger on Oct 22, 2019 18:03:19 GMT
This is probably a silly question, but could someone please describe the electrical circuit for a thermostatically controlled pump. Ta. The one I ordered probably goes a bit fast. Can I slow it with a cheap pulse width type control? Normally a thermostat just acts like a switch, so you put it in series with the pump. +ve supply to thermostat to pump to -ve supply. If the thermostat is something fancy and electronic, it might be different. You may be able to slow the pump but it depends on the design. Which pump did you order? Thanks, that's simple then. One of these. www.t7design.co.uk/products/ebp15-electric-water-pump-12v.html
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Post by Deleted on Oct 22, 2019 18:03:40 GMT
The Gold standard for circulation pumps used to be the Bolin pump but I think they stopped doing them for some reason.
Some better stuff coming from China I expect. Worth checking is it brushless motor or brushed.
This allows the whole "brushless is better than brushed" argument to get going.
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Post by lollygagger on Oct 22, 2019 18:06:15 GMT
The Gold standard for circulation pumps used to be the Bolin pump but I think they stopped doing them for some reason. Some better stuff coming from China I expect. Worth checking is it brushless motor or brushed. This allows the whole "brushless is better than brushed" argument to get going. Brushless.
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Post by Deleted on Oct 22, 2019 18:08:43 GMT
The Gold standard for circulation pumps used to be the Bolin pump but I think they stopped doing them for some reason. Some better stuff coming from China I expect. Worth checking is it brushless motor or brushed. This allows the whole "brushless is better than brushed" argument to get going. Brushless. Brushed is better.
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Post by lollygagger on Oct 22, 2019 18:09:44 GMT
It's that kind of thing for sure. People also use them on motorbikes to eek out a few more HP by removing the mechanical pump, apparently.
Ah - you deleted the post I was replying to. Yes it's an Aux pump.
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Post by lollygagger on Oct 22, 2019 18:11:31 GMT
Oh no it isn't. Actually I haven't a clue but I believe these type can't leak and should be fairly quite, I hope no louder than a fridge.
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Post by Deleted on Oct 22, 2019 18:14:58 GMT
Oh yes it is.
Either would be pretty quiet. Brushless will probably use less power and not need brushes.
That's why they call them brushless. No brushes. They don't need brushes.
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Post by Telemachus on Oct 22, 2019 19:28:04 GMT
Normally a thermostat just acts like a switch, so you put it in series with the pump. +ve supply to thermostat to pump to -ve supply. If the thermostat is something fancy and electronic, it might be different. You may be able to slow the pump but it depends on the design. Which pump did you order? Thanks, that's simple then. One of these. www.t7design.co.uk/products/ebp15-electric-water-pump-12v.htmlNot sure whether you will be able to control it with PWM / reduced voltage. I rather suspect not, but it’s down to the internal electronics used drive the pump. Probably wouldn’t hurt to try though.
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Post by brummieboy on Oct 24, 2019 19:38:09 GMT
Remember, you do not need a pump, but a circulator. Your performance requirement will be extremely low. In domestic terms, the largest pump you are likely to see in a big house is only rated for about 25 lts/min and this is operating at a static head of 8-10 mts. I have one similar to this www.amazon.co.uk/TOPINCN-Temperature-Brushless-Circulation-Submersible/dp/B07N1DSMCW/ and it is more than adequate, operating for about 35 secs in 3 mins on a 5kw boiler, with a thermostat on the flow pipe set at 65oC.
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Post by Telemachus on Oct 24, 2019 19:42:59 GMT
Remember, you do not need a pump, but a circulator. Your performance requirement will be extremely low. In domestic terms, the largest pump you are likely to see in a big house is only rated for about 25 lts/min and this is operating at a static head of 8-10 mts. I have one similar to this www.amazon.co.uk/TOPINCN-Temperature-Brushless-Circulation-Submersible/dp/B07N1DSMCW/ and it is more than adequate, operating for about 35 secs in 3 mins on a 5kw boiler, with a thermostat on the flow pipe set at 65oC. The spec says max water temperature 55C. You’re on borrowed time!
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Post by peterboat on Oct 24, 2019 20:29:18 GMT
Normally a thermostat just acts like a switch, so you put it in series with the pump. +ve supply to thermostat to pump to -ve supply. If the thermostat is something fancy and electronic, it might be different. You may be able to slow the pump but it depends on the design. Which pump did you order? Thanks, that's simple then. One of these. www.t7design.co.uk/products/ebp15-electric-water-pump-12v.htmlGood choice the earlier brushed motors would do 100k the later brushless ones I have never changed, remember rust is an issue for the magnetic drive so use antfreeze, plus put it before the boiler they can cope with heat but last longer the cooler they run
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Post by peterboat on Oct 24, 2019 20:34:11 GMT
Remember, you do not need a pump, but a circulator. Your performance requirement will be extremely low. In domestic terms, the largest pump you are likely to see in a big house is only rated for about 25 lts/min and this is operating at a static head of 8-10 mts. I have one similar to this www.amazon.co.uk/TOPINCN-Temperature-Brushless-Circulation-Submersible/dp/B07N1DSMCW/ and it is more than adequate, operating for about 35 secs in 3 mins on a 5kw boiler, with a thermostat on the flow pipe set at 65oC. The spec says max water temperature 55C. You’re on borrowed time! If its on the return its not that hot.
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Post by Telemachus on Oct 24, 2019 20:38:16 GMT
The spec says max water temperature 55C. You’re on borrowed time! If its on the return its not that hot. 55C even on a return, is pretty cool for a central heating system. Especially with a hard-to-regulate heat source like a stove. It’s bound to go over that once the boat warms up, unless the boiler output is mismatched to the radiator load.
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Post by peterboat on Oct 24, 2019 20:53:44 GMT
If its on the return its not that hot. 55C even on a return, is pretty cool for a central heating system. Especially with a hard-to-regulate heat source like a stove. It’s bound to go over that once the boat warms up, unless the boiler output is mismatched to the radiator load. Mine doesnt
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