Hi Andy,  I have queries on my flow temperature which are not dissimilar to yours.  I have been wondering why my flow temperature seems low when compared with the anticipated temperature from the heat curve.  What I haven’t done, and will, is check against the controller.

3 questions.  Your status screen shot gives system pressure at 1.5bar.  I don’t have that shown - see my photo below.  Further, my HC is set at 0.4 suggesting the flow should be about 33 not the 30 shown. My flow T is nearly always below what the HC suggests and I don’t understand why.  

Second question is where the temperature gauge is mounted.  I assume on the external unit within the casing?

A final question, can anyone tell me roughly how long the defrost cycle might take?  I did a subsequent status check and power was down to 22watts and flow at 25 so I assume this is defrost.  I checked again about 10 minutes later and the figures were similar.  Today is one of the few times since instal the ambient has been close to 0C so my experience of what happens is very limited.

Any thoughts on any of the above would be appreciated?  David

Posted by: @davidb

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A final question, can anyone tell me roughly how long the defrost cycle might take?  I did a subsequent status check and power was down to 22watts and flow at 25 so I assume this is defrost.  I checked again about 10 minutes later and the figures were similar.  Today is one of the few times since instal the ambient has been close to 0C so my experience of what happens is very limited.

Mine takes about 20mins in total.  In haven't followed the exact sequence but there is a period of about 5 mins when the fan and compressor turn off and slowly vapour starts to appear above the unit.  This must be when the warm water from the house is melting the ice.  Then the fan goes on and there a big, rather impressive, cloud of vapour is emitter from the front of the unit.  Then the compressor goes back on and typically ramps up to maximum or thereabouts for 10-15 mins, to recover the flow temperature.  Then it settles down until the next cycle.

@jamespa Thanks James, that is really helpful.  Can I assume that, by monitoring the power used in the status tab, I know the defrost cycle is actually doing the defrost.  22W is the power taken by my pump.  After that the power use will ramp up so reheating everything and the flow temp should be at the level dictated by the HC?

Posted by: @davidb

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@jamespa Thanks James, that is really helpful.  Can I assume that, by monitoring the power used in the status tab, I know the defrost cycle is actually doing the defrost.  22W is the power taken by my pump.  After that the power use will ramp up so reheating everything and the flow temp should be at the level dictated by the HC?

Yes in principle, but its quite difficult to monitor this way because you cant see trends  Also Im not sure the delay between what the app reads and the outside world and the frequency with which the app updates.  Live monitor is real time so that may be better.  It takes a while for the FT to recover, 10-20mins.

If you want to look at things in this way you really need some monitoring that presents the results as a time graph.  Home Assistant is the cheapest way, the only hardware needed is a computer (eg a raspberry pi) to run it on.  The OpenEnergyMonitor hardware is an alternative and more comprehensive, but quite expensive and for most people unnecessary.

Posted by: @bengeo

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Is anyone else seeing this?

Thanks,

Andy

I dont know how often info in the app is updated, but its definitely not real time in the way that live monitor is.  Thats the most likely reason for a discrepency.

Posted by: @davidb

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I have queries on my flow temperature which are not dissimilar to yours.  I have been wondering why my flow temperature seems low when compared with the anticipated temperature from the heat curve.  What I haven’t done, and will, is check against the controller.

It will be interesting to see what your controller says. 

Posted by: @davidb

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Your status screen shot gives system pressure at 1.5bar.  I don’t have that shown - see my photo below.  Further, my HC is set at 0.4 suggesting the flow should be about 33 not the 30 shown. My flow T is nearly always below what the HC suggests and I don’t understand why.  

Re the system pressure, have you got the latest version of the app?
It looks like you are seeing the same discrepancy as me.

Posted by: @davidb

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where the temperature gauge is mounted.  I assume on the external unit within the casing?

It's on a backup heater that is in-line with the system and located in the plant room.

Posted by: @jamespa

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I dont know how often info in the app is updated, but its definitely not real time in the way that live monitor is.  That's the most likely reason for a discrepency.

No, I've looked at it multiple times over a few weeks now and it is always about 3 degrees out. 

Posted by: @bengeo

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Posted by: @jamespa

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I dont know how often info in the app is updated, but its definitely not real time in the way that live monitor is.  That's the most likely reason for a discrepency.

No, I've looked at it multiple times over a few weeks now and it is always about 3 degrees out. 

 

 

No idea then, it's inconceivable that the app and live monitor use different sensors!

Hi Andy,  finally I have done the flow temp check and both Senso Comfort and Live Monitor show the same flow temperature.  In my case it is currently 28C.  

In scrolling through the menu, what I don’t understand is the “Target Flow temperature” which is showing 26C.  With the HC set at 0.4 and an outside T of 6C, the curve suggests a temperature of about 32C.  The HC is currently controlling the system so I would have expected the “Target Flow Temp” to be as per the HC.  Any explanations?  What am I not understanding?

in incidentally I have no temperature gauge in my plant room.

Posted by: @davidb

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The HC is currently controlling the system so I would have expected the “Target Flow Temp” to be as per the HC.  Any explanations?  What am I not understanding?

When its cycled off mine sometimes seems to show a target flow temp that is less than the 'on' target.

I have occasionally wondered why and speculated that it is to do with the energy integral calculations, but haven't bothered to look into it in detail because Im warm for a reasonable cost so have some limits on my interest in reverse engineering!. 

Posted by: @davidb

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Hi Andy,  finally I have done the flow temp check and both Senso Comfort and Live Monitor show the same flow temperature.  In my case it is currently 28C. 

Is that the same in the App too?