OCTOPUS users only please....Heat up Eficiency

ninjaef

Please please please only comment if you actually use an octopus Daikin heat pump with MMI , onecta app and room thermostat provided... PLEASE... I've posted elsewhere and get different views, inconsistent, and confused because it's not my system and not relevant or speculation because they don't know my system.

so.. does any OCTOPUS user have something like this for heating up a house and cooling down at night...

My Daikin 4kw was installed in April and during this first winter it takes about 3hrs to go from 18c to 20c. I have the heating on 24/7 but that 18c is set on the onecta app schedule from 10pm to 6am so the house is cool and we can all sleep. The 20c is from 6am to 10pm so we're all warm. We live in a bungalow and the rads in the two bedrooms are turned down because it's too hot through the night otherwise but a lower temp setpoint means more work for the pump to bring the house to 20c at 6am. We also use the weather curve that octopus set which is 50c at -3 outside and 25c at 20c outside.

however I've been told and read that you should keep the house at a constant temp 24/7 for max efficiency...my god I couldn't sleep in a room at 20c, 18c is max but ideally 17c for us.

how do you run yours?
.

Alnat1

Does the Onecta allow more than 2 time periods? So, for instance you could try a 19C period from 5am-7am so it would warm up more gradually in the morning and perhaps not wake you up. Or get a lower tog duvet 

ninjaef

Alnat1 said:

Does the Onecta allow more than 2 time periods? So, for instance you could try a 19C period from 5am-7am so it would warm up more gradually in the morning and perhaps not wake you up. Or get a lower tog duvet 

😅😂 lower tog, this the first time I've laughed and this system in 8 months.

yes it has as many time slots as needed..

what's the difference may I ask please, between a 5-7 at 19c then 7-8 at 20c , versus 6am-8am  at 20c ?? both have to start from 17c which is matched through the night, so the extra time slot is...

*  going to heat when not wanted
* use 1hr more energy wherever that might be?.
* don't forget it's on a weather curve + any other algorithms it may use to my bewilderment so the LWT is set by outside temp, it's colder at 5 than 7am maybe so earlier starts mean colder ambient means higher LWT means more costs....not less 

or am I missing something
???

LessImpecunious

No expertise on your system so not commenting on that, and don't think this will be of much assistance (sorry!) but generally I've found outside temperatures are lowest round about dawn, so at this time of year it will tend to be colder at 7am than 5am (seemed counterintuitive until I started monitoring these things closely). Hope you find an optimal solution

Spies

I have mine set to 19c from 10am to 4am when its then set to 20c to catch the end of the IOG 7p rate, then 21c from 8am to 10pm, this is what my temperature of the coldest room in my house does...

My weather curve is 46@-5c 32@18c, modulation on 4 and overshoot set to 2

ninjaef

Spies said:

I have mine set to 19c from 10am to 4am when its then set to 20c to catch the end of the IOG 7p rate, then 21c from 8am to 10pm, this is what my temperature of the coldest room in my house does...

My weather curve is 46@-5c 32@18c, modulation on 4 and overshoot set to 2

what does Modulation and Overshoot do, and why select the values you have, and how to set it ... I don't see them in the MMI.

Spies

It's trial and error, overshoot allows leaving water temperature to climb 2c over target in warmer weather to avoid compressor shutting off (cycling), modulation allows +4c over target in order to heat the house faster if the thermostat isn't seeing a fast enough rise in temperature. 

they're under the installer menu, use code 5678 under user profile to aceess, then code 1234 to go back to advanced mode.