Ecodans and Nest thermostats - can it work?

Hightower · 2022-01-16T19:49:56Z

Hello All, New member after reading all the other helpful posts - wonder if I can pick your brains. I've an Ecodan 11.2KW ASHP and had it since June 21 but not really had to use the heating till October (SW England). I'm trying to work out if its running efficiently and struggling to be honest. I've contacted the installer mutiple times to no avail. My understanding is for best efficiency - its better to run near constant at a lower temp than a start stop regime. I have a Nest 3rd gen thermostat controlling it - but it seems like its either on or off with no background running. It allows me to choose a heat pump - through radiators but little else. I guess my worry is in theory, is this just cycling the pump up and down over the day and less efficient? would changing the nest to the official mitsubishi one make a difference in the way the ftc reacts to the inputs or is there something to change setting wise? Or is this just how they work and the pump should even it out? TBH I'm not really up to speed with how best to optimise the settings on the ecodan so any tips also appreciated - nor how any of the curve settings actually effect the energy use! The house is warm enough, the suppliers calcs were an energy use of 6586kw annually, currently using 572kw for December with a delivered of 1874. Cheers for any help/tips!

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Derek M

(@derek-m)

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Joined: 5 years ago

Posts: 4427

17/01/2022 4:38 pm

Posted by: @hightower

I've been looking in the manual but can't quite figure out if the ftc6 can do the auto adaptation on it's own, or if it needs a seperate room temp sensor - that I guess the mitsubishi one would be - and not sure if the nest does or not...

Hi,

The FTC controller has an inbuilt temperature sensor, which can be used to provide auto adaptation control, provided that the FTC controller is sited in a suitable location. As far as I am aware the Nest is just an expensive thermostat, and just switches the heating on and off.

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Kev M

(@kev-m)

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Posts: 1276

17/01/2022 7:31 pm

Posted by: @hightower

I've been looking in the manual but can't quite figure out if the ftc6 can do the auto adaptation on it's own, or if it needs a seperate room temp sensor - that I guess the mitsubishi one would be - and not sure if the nest does or not...

You need either a Mitsubishi wireless controller, a thermistor hard wired into the FTC6 or as Derek says the FTC6 controller to be in the living area. If it's in the airing cupboard like mine, it won't work properly on auto adaptation.

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Hightower

(@hightower)

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Joined: 4 years ago

Posts: 6

Topic starter 17/01/2022 8:40 pm

Managed to speak to the installers - hopefully got the wireless controller heading my way ( they didnt install it thanks to the nest being there, but didn't leave me it either!

Will go with the weather compensation for now and then mess it all up again if/when the controller arrives!

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