Nest Thermostat 3rd Gen / Dimplex Air Source Heat Pump

sphinx501

I bought a Nest 3rd Gen a few months ago before moving house, the new house has a Dimplex air source heat pump which controls the heating and hot water.

I notice on the online guide the 2nd gen is listed as supporting "Air-source and ground-source heat pumps" I presume the 3rd gen also do?
https://nest.com/uk/support/article/Which-heating-systems-are-compatible-with-the-Nest-Learning-Thermostat

Does anyone have experience of fitting the Nest in place of a Dimplex thermostat.

This is the current thermostat...
http://sourceenergy.co.uk/wp-content/uploads/2015/07/Dimplex-A-Class-air-source-heat-pump-installers-Ayrshire.jpg

ted1

Isn't it counter productive? Due to the nature of heat pumps and their response time should t they just more or less be left to the one setting

sphinx501

ted1 wrote: »

Isn't it counter productive? Due to the nature of heat pumps and their response time should t they just more or less be left to the one setting

Yes, I believe the reccomendation is to the leave the temperature constant, however I already have the Nest before I knew this was the heating!

Hence trying to decide if the Nest can replace it and allow the remote access, and Away from home features.

trveller72

Did you manage to install the Nest?
I have a Dimplex air source heat pump also.
From your picture it seems to me that what you are showing is the remote control for the heat pump, not the thermostat.
Probably you have normal thermostats @ Ground Floor (Living Room/Lobby) and 1st Floor (bedroom).
I do not think the remote (if that is what you are showing) can be replaced with the Nest, but I am thinking to replace the thermostats with the Nest.
Just make sure the thermostats you have (if you have any) have 3 wires (they must have Neutral wire)

sphinx501

trveller72 wrote: »

Did you manage to install the Nest?
I have a Dimplex air source heat pump also.
From your picture it seems to me that what you are showing is the remote control for the heat pump, not the thermostat.
Probably you have normal thermostats @ Ground Floor (Living Room/Lobby) and 1st Floor (bedroom).
I do not think the remote (if that is what you are showing) can be replaced with the Nest, but I am thinking to replace the thermostats with the Nest.
Just make sure the thermostats you have (if you have any) have 3 wires (they must have Neutral wire)

Sorry just seen this - no I have yet to attempt this, I have a thermostat upstairs with two wires only. The Heat Link also must be installed, did you have any success installing?

trveller72

sphinx501 wrote: »

Sorry just seen this - no I have yet to attempt this, I have a thermostat upstairs with two wires only. The Heat Link also must be installed, did you have any success installing?

Yes I installed it and works fine.
I had 3 wires at the thermostat, N-L-Contact (see pictures). The wall on which the thermostat was installed was a partition wall in the entry lobby, and on the other side of the wall I have the downstairs toilet.
I installed the Heat Link on the toilet side using the 3 wires and i just added 2 wires from the Heat Link to the Nest on the lobby side.
I think in your case, you'll have to install the Heat Link where you have the valve that control the heating (usually beside the boiler) and use the 2 wires at the thermostat to connect the Nest. (I should have done this also, it is a neat install).
I hope it makes sense.
All I can say is that it is worth it.

sphinx501

trveller72 wrote: »

Yes I installed it and works fine.
I had 3 wires at the thermostat, N-L-Contact (see pictures). The wall on which the thermostat was installed was a partition wall in the entry lobby, and on the other side of the wall I have the downstairs toilet.
I installed the Heat Link on the toilet side using the 3 wires and i just added 2 wires from the Heat Link to the Nest on the lobby side.
I think in your case, you'll have to install the Heat Link where you have the valve that control the heating (usually beside the boiler) and use the 2 wires at the thermostat to connect the Nest. (I should have done this also, it is a neat install).
I hope it makes sense.
All I can say is that it is worth it.

Didn't even think of simply reusing the thermostat wiring, I was focused on the junction box.

Some forums are leading me to believe the Nest will work with N-L alone, but need to confirm that. It is the CM2 I have so may need to run wiring from the junction box alright - http://www.ephcontrols.com/contentFiles/Product-Downloads/CM_Thermostat.pdf

Thanks for the response, you might have given me the motivation to get this done finally :pac:

ashish.13

trveller72 wrote: »

Yes I installed it and works fine.
I had 3 wires at the thermostat, N-L-Contact (see pictures). The wall on which the thermostat was installed was a partition wall in the entry lobby, and on the other side of the wall I have the downstairs toilet.
I installed the Heat Link on the toilet side using the 3 wires and i just added 2 wires from the Heat Link to the Nest on the lobby side.
I think in your case, you'll have to install the Heat Link where you have the valve that control the heating (usually beside the boiler) and use the 2 wires at the thermostat to connect the Nest. (I should have done this also, it is a neat install).
I hope it makes sense.
All I can say is that it is worth it.

I have a Air to water heat pump unit as well (Diakin Altherma). It has two zones for two floors and also there were two thermostats. This one => https://www.youtube.com/watch?v=LHuwCan0ZvI

I got nest installed by a technician who placed it in living room and

• it only controls temperature downstairs.
• Upstairs are still controlled with heatmiser (which cannot control temperature remotely or away from home)
• there is no hot water control also from nest.

Q1: Can I not have upstairs zone also controlled by same nest that is installed downstairs.? (like different temperatures downstairs and upstairs)
Q2: If yes, do I need some other hardware for this.? A nest temperature sensor will help or not.? https://nest.com/thermostats/nest-temperature-sensor/overview/
Q3: If no, installing another nest thermostat is the only option to control upstairs heating remotely.?
Q3: Can I never have hot water controlled through nest.? (like the temperature it should maintain or turn hot water on/off)

Thanks in advance.!

trveller72

ashish.13 wrote: »

I have a Air to water heat pump unit as well (Diakin Altherma). It has two zones for two floors and also there were two thermostats. This one => https://www.youtube.com/watch?v=LHuwCan0ZvI

I got nest installed by a technician who placed it in living room and

• it only controls temperature downstairs.
• Upstairs are still controlled with heatmiser (which cannot control temperature remotely or away from home)
• there is no hot water control also from nest.

Q1: Can I not have upstairs zone also controlled by same nest that is installed downstairs.? (like different temperatures downstairs and upstairs)
Q2: If yes, do I need some other hardware for this.? A nest temperature sensor will help or not.? https://nest.com/thermostats/nest-temperature-sensor/overview/
Q3: If no, installing another nest thermostat is the only option to control upstairs heating remotely.?
Q3: Can I never have hot water controlled through nest.? (like the temperature it should maintain or turn hot water on/off)

Thanks in advance.!

Q1. As far as I know Nest will control only one zone.
Q2. The sensor will override the Nest sensor - "Helps make sure a certain room is the exact temperature you want it to be."
Q3. I think this is the way to go. I had a second nest installed in January (Electric Ireland Offer - half price including install and a Google Home Mini free - https://shop.electricireland.ie/products/install-detail/nest-thermostat)
Q4. I do not think so, as the hot water is controlled by the Heat Pump's remote / control panel.
Anyway, as far as I was advised, with the heat pump is best to have the hot water on all the time - it will keep it at a constant temperature.


Just to conclude, the 2 Nest thermostats work well together, and controlling them with the Google Home (and with Amazon Echo) is a very spectacular trick.

Arthur L

Hi Gentlemen,
i am wondering if you could help me. i see some of you have connected smart thermostat to Heatpump and it works fine.

I am trying to connect Honeywell Evohome wireless thermostat to exisitng Dimplex. we have 2 different zones downstairs that is controlled by User Interface and Upstairs that has temperature probe.

I have wired up wireless relay to one of volt free Digital inputs and User interface sees it when it kicks in ( it changes the values from 0 to 1) however it does not start the heating. i believe my Digital input somehow has to be linked to one of the zones to start the heating process. this is what i am currently having issues to figure out

My question is if anyone have had any exerience wiring Digital inputs and controlling heating this way.

i know for each zone i will need separate thermostats which is fine i will introduce once figure out how it can be connected.

thanks
Arthur