I run a Daikin EDLA08 system for both hot water and heating. I’m having a real issue with the hot water system drawing electricity several times a day outside of the scheduled ASHP cycle (same on Reheat only btw). I think the following screenshots should make the problem quite clear since it was on 22 September, so the heating system was still switched off. Here is a screenshot of the EMON monitoring of the ASHP energy consumption on that day.
As you can see, the actual heat pump used 0.945kwh on that day, but the Daikin system used 7kwh. I’ve since been playing around with things, but the random energy use of 1kwh per run for hot water just doesn’t go away, so this has to be the immersion heater. The disinfection is only run once a week at night, so that can’t be it either. I’ve reached out to Daikin, but they’ve not been very helpful so far. Does anybody have any ideas what might trigger this? It’s driving me nuts. Thanks!
Hi, Have you checked your ONECTA app data against anything else like smart meter data to see if this is actually using as much electricity as you think it is?
How is the immersion controlled? Is it through the Daikin controller, or is it on a seperate circuit?
My feeling is that if it were being switched on by the Daikin controller, you’d see that usage on the Emon graph.
I’m not familiar with Daikin units at all though, so I might be wrong.
Hi, I appreciate any pointer/reply, so thank you! I specifically reached out to EMON and they said their monitoring only measures the consumption of the outside unit. And I only cottoned on to the whole thing by comparing my overall consumption to EMON plus all the other appliances, and had a consistent gap of 5-7 kwh per day. So far, I have not managed to figure out where in the Daikin controller it is located, it doesn’t seem to be a separate circuit. But the next answer might have pointed me in the right direction. Will look into that tonight.
I think you might have pointed me in the right direction, thank you! I’ll try and check that out tonight, fingers crossed I can find it. I’ll let you know how it goes
“Only the outside unit”? in my Octopus/Daikin installation the EMON electricity meter measures the supply to the outside HP unit, but the power for the immersion element is looped from the outside unit up to the cylinder area. So the EMON electricity meter (and hence L3 monitoring) captures all power used by Daikin.
I have an Octopus wiring box in my airing cupboard with a rocker switch that controls power to the immersion. I have this set to OFF permanently.
The software can do whatever it likes. My immersion ain’t coming on
Yes, that’s the one. Have the lid off and trace the wires. I think you’ll find that’s power to the immersion - coming up the conduit from the outside unit.
IMO, our 8kW Daikins don’t have any resistive heaters in the outside unit.
Furthermore, if power is off or if the circulation pump fails on that cold dark night, the outside unit could freeze…but we have anti-freeze valves fitted for that … I believe !
I need to check, but I’m not aware of the immersion being wired via the outside unit. I’ll try and find out. I also don’t have a switch for it (booster, immersion, none of that). I’ve found the MMI settings for the immersion heater though, and have restricted it to legionella only. Let’s see if that does the trick.
When I say “via the outside unit” what I mean is I have a fuse box adjacent to the HP. Supply and two circuits. Both circuits go inside the HP and one of them loops into the flexible conduit that ends up in a box near my cylinder and MMI with the comms cables from the HP.
