@gery I know when I look at my octopus energy account there are options (my devices) to allow octopus app to access the Octoups Daikin heat pumps. For example they control my Tesla batteries in the solar months. it must be complicated if you have both the homely and Octopus and the Daikin controller all interlinked, but homely can work in smart + mode with the octopus TOU tariffs, so theoretically it should be ok. I wonder if there’s a conflict.
@majordennisbloodnok Yes, we did, at that time, Octopus were surveying our house and the possibilities; we felt that a horizontal tank in the loft was a possible option but not with them and only if we enlarged the loft trap to do so. OE were not keen on going outside their ‘scope’ to fit anything beyond basic layouts. By the time we had chosen our installers, we had discounted the additional work involved and the greater heat losses with not having a heated airing cupboard. Toodles.
Toodles, heats his home with cold draughts and cooks food with magnets.
@toodles thank you for your response. I have a couple of questions on your heating integration that I hope you can help with.
1) Do you get error red error messages on the RS845 LED on the Daikin Modbus adapter? I guess it depends on how accessible it for you to check - mine flashes green then around 5 red flashes which I think indicates some sort of error code.
2) Do you think you installer might be able to help if he has done a Daikin/homely integration? I'm in North Somerset so may be not close to you?
This is a still from a video. Top left (10&11) is the two P1 & P2 wires going from the main Daikin unit to the Modoka thermostat that I've stuck the Modbus in the 'daisy chain'. Apparently the Modbus can he anywhere in the daisy chain - sometime on the heat pump? Bottom left (1&2) is power and the two terminal next (3&4) to it with the resistor across are the input from the homely controller. If I switch off the Homely controller then I don't get the red flashing error on the RS485 but equally then I have no control! The bottom dip switch is the only one 'on'.
@gery Sorry Gerry, mine is configured by adding an interface board on the heat pump itself. You do know that there are homely installation videos on YouTube that show you exactly how to install it and test the installation. Both with the just the controller and also with the controller and thermostat. If the full daisy chain isn’t working I’d be inclined to try it without the thermostat and see if the fault goes. I don’t really understand why you’d want a thermostat if you are using the homely, it has its own temp and light sensor. Mine is integral with MMI and left that in the garage with all the other hardware as it’s not needed for anything on a day to day basis.
This is a still from a video. Top left (10&11) is the two P1 & P2 wires going from the main Daikin unit to the Modoka thermostat that I've stuck the Modbus in the 'daisy chain'. Apparently the Modbus can he anywhere in the daisy chain - sometime on the heat pump? Bottom left (1&2) is power and the two terminal next (3&4) to it with the resistor across are the input from the homely controller. If I switch off the Homely controller then I don't get the red flashing error on the RS485 but equally then I have no control! The bottom dip switch is the only one 'on'.
OK, so I'm going to preface this post by saying I haven't got a Daikin and have never dealt with a DCOM unit before so I am far from an expert. However, I do know a little about modbus and I've got the DCOM and Homely reference manuals in front of me so for what it's worth....
Can you double check and confirm that the other end of the wire going into terminal 3 (RS485 +) is connected to the correct Homely terminal (i.e. terminal A) and that the wire from terminal 4 (RS485 -) is connected to Homely terminal B? There are only three things to mess about with in a modbus installation (cables going to correct terminals, termination resistor installed or not and modbus address), and your photo shows everything at the DCOM end is set up exactly as the Homely manual lays out. The only thing it doesn't show is the other end of the cable, hence the double check.
105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs
"Semper in excretia; sumus solum profundum variat"
@majordennisbloodnok Just in case there are variations in how the D.comm is configured, I am attaching a PDF of the manual for mine; though TBH, I suspect this is already what you have to hand Major.
