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Ask The Trades › DIY Forum › Plumbing Questions › Danfoss FP715 Si question

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Danfoss FP715 Si question (Read 5292 times)

CWatters

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Danfoss FP715 Si question
Nov 27^th, 2011, 8:49pm

This programmer has DIL switches to set it up for things like 7 day or 5/2 day operation. One of these switches is marked Pumped and Gravity.

I know what pumped and gravity mean but what difference does it make to the timer? Does it advance the timing if set to gravity on the basis that gravity systems take longer to warm up? That's the only thing I can think of. If so then by how much?

This is just for my education, nothing wrong with the system.

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Natedog Full Member Offline Ask The Trades Posts: 347 Total Thanks: 9 For This Post: 0 Swindon United Kingdom	Re: Danfoss FP715 Si question Reply #1 - Nov 27^th, 2011, 11:07pm Stops the connections for the pump being live? Or to let the pump carry on running when the boiler isn't firing?
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scotspark Trade Member Offline mmmmm it's gonna cost you!! Posts: 3074 Total Thanks: 10 For This Post: 0 scotland Scotland Gender: Trade: Electrician	Re: Danfoss FP715 Si question Reply #2 - Nov 27^th, 2011, 11:30pm pumped can have hot water or heating only. gravity can only have hot water only or heating with hot water.
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CWatters Super Member Offline "Daddy fick it" says James Posts: 5150 Total Thanks: 58 For This Post: 0 Gender:	Re: Danfoss FP715 Si question Reply #3 - Nov 29^th, 2011, 7:49am Natedog wrote on Nov 27^th, 2011, 11:07pm: Stops the connections for the pump being live? Or to let the pump carry on running when the boiler isn't firing? I don't think that can be it because there are only two output relays, one for DHW, one for CH. No seperate output for the pump.
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CWatters Super Member Offline "Daddy fick it" says James Posts: 5150 Total Thanks: 58 For This Post: 0 Gender:	Re: Danfoss FP715 Si question Reply #4 - Nov 29^th, 2011, 7:58am scotspark wrote on Nov 27^th, 2011, 11:30pm: pumped can have hot water or heating only. gravity can only have hot water only or heating with hot water. Ah ok that makes sense.
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Lectrician Administrator Trade Member Author Offline Ask The Trades Posts: 8815 Total Thanks: 109 For This Post: 0 Braunton, North Devon United Kingdom Gender: Trade: Electrician	Re: Danfoss FP715 Si question Reply #5 - Dec 8^th, 2011, 6:31am Yep, if ever you turn the heating on, the hot water latches on too. It usually also then only follows a single time pattern, not two.
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