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Garage_Hermit

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Reply with quote  #31 
thanks for that, Carl - here's a vid of it in action...



(it looks like this pump really sucks, so to speak...)

As always, the question is off to be (U guessed...) how to get it running with Ken's variable-speed controller...
The video is not very clear and the presentation of the PSU module is very fuzzy and speedy... hard to see the connectivity etc.

G_H

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(1)  "Heat goes from hot to cold, there is no directional bias"
(2) It's wrote, "voilà" unless talking musical instruments...

cwwilson721

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Reply with quote  #32 
From what I saw, in the description/whatever, 12v+/-, and PWM leads.

Now to find/make a Temp sensing PWM controller

guy

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Reply with quote  #33 
 Hello

 Control Resources makes temperature sensing controllers for AC motors up to 18 amps and DC motors up to 9 amps. http://controlresources.com/ac-fan-control-ac-motor-control-smartfan/ http://controlresources.com/dc-fan-control-dc-motor-control-smartfan/  I have seen there Nimbus 7.5 amp AC motor controller for $79 online and there website says they make lots of 50 for $29.70 each so you may be able to find them cheaper.


                                                Guy 
Garage_Hermit

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Reply with quote  #34 
Hello, Guy,

Thanks for the valuable input !

I took a look at that site, very interesting, the snag is, they don't cater to individual orders, they are design & build consultants.  OK if you are an installer, needing a few hundred copies !

Still, it proves that the sort of stuff we require DOES exist out there !

such as this...

http://controlresources.com/custom-electronics-design-services-pump-controller/

Just have to find a supplier now !

Guess I'll explore some infloor-radiant suppliers and see if an off-the-shelf pump is easily available...


UPDATED:

Voilà !  http://www.supplyhouse.com/Radiant-Heat-Controls-212000
HOWEVER
(there is always an however...)
I find myself getting oriented towards "radiant infloor" insted of keeping it neutral and sticking to HYDRONIC...

Hope somebody can help (particular, a domestic hot-water specialist !)

(in particular, I seem to be learning that radiant infloor is controlled by VALVES, rather than pumps ?????) EEK !

(I mean this...).

http://www.healthyheating.com/Control-Valve-Theory/Control-Valve-Theory-pg1.htm#.U1zqV6JFUvk

(I'd better get out of here, this thread is starting to looking complex...)

G_H

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(1)  "Heat goes from hot to cold, there is no directional bias"
(2) It's wrote, "voilà" unless talking musical instruments...
guy

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Reply with quote  #35 
Hi G_H

 Here's the the retail link I found http://www.smokelessheat.com/boiler-accessories/nimbus-smartfan




                                         Guy
Garage_Hermit

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Reply with quote  #36 
thanks again, Guy, and well done for finding that link !

it is looking very promising !

and 79 USD only [smile]

I tried to d/l the manual for this controller, but it seems to be sticking...

The good news is, it will accept up to THREE temperature sensors, so looks like we are finally getting to the head of the nail !

Here is the link to the manual, for easy reference...

http://www.smokelessheat.com/Media/FurnaceDocuments/SmartFan/Nimbus.pdf

I'll try it later...

Cheers,

G_H

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(1)  "Heat goes from hot to cold, there is no directional bias"
(2) It's wrote, "voilà" unless talking musical instruments...
cwwilson721

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Reply with quote  #37 
That's to control a AC motor, tho...

But, maybe, the "control signal" can do the DC one...
Garage_Hermit

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Reply with quote  #38 
Hi, Carl,

Yes, agree, this unit is for an AC motor, but it is one half of the struggle out of the way !

Now to find the equivalent for a DC motor...

Paraphrasing what seems to be the general info out there, "speed-control per se is a lot easier on DC than on AC", yet from what I see, the control functions are generally pressure and/or flow rate...  It seems hellish hard to find a temperature-based controller, all the more so one that works with a temperature *differential*, but we'll get there, hopefully !

On with the search [rolleyes]

G_H


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(1)  "Heat goes from hot to cold, there is no directional bias"
(2) It's wrote, "voilà" unless talking musical instruments...
cwwilson721

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Reply with quote  #39 
Remember this?

http://www.ebay.com/itm/321341301170?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Can be modded (variable resistor on the knob) to a variable voltage, I'm assuming. Thus, replaces the mechanical "twist" with something or another...

Sorry, I can't be more clear or concise this AM..Been up all night watching the storms moving in here in Alabama. It's just over 3 years since the April 27th 2011 tornadoes. I'm keeping a watch on it. Gonna be big, somewhere, somehow...
cwwilson721

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Reply with quote  #40 
Of course, there's always this:

http://www.circuitstoday.com/temperature-controlled-dc-fan
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