New ASHP and HIVE app.

matt_drummer

Reed_Richards said:

Little bits of misinformation are creeping in to some of the responses.  I have a heat pump with a third party controller (a Drayton Wiser but similar to a Hive).  Using my third party controller and a room thermostat I can turn the CH function of my heat pump on and off at pre-set times and vary the target room temperature as I wish.  This does NOT turn the entire heat pump on and off.  I have set up Weather Compensation on my heat pump and that works perfectly well and completely independently of my third party controller.  My Weather Compensation settings are not taken to extremes so I can vary the room temperature slowly should I want to.  I have two zones, one is a small zone with just the bathroom radiators so I can heat the towels in summer if I want to.  There isn't much water in this zone alone so I need a buffer tank.

What I cannot do with my third party controller is Load Compensation.  This is a feature where your heat source varies how hard it works according to the difference in the actual room temperature and the desired room temperature set on the thermostat.  This is a useful feature if you want to vary your room temperature, making it cooler at night for example.  No heat pump that I know of has the ability to do Load Compensation with a Hive or similar, although many gas boilers can.  So you would need to use the manufacturer's controller if you want Load Compensation, but I'm not sure if the Grant controller can even do this.        

Your third party room thermostat must tell your heat pump to stop producing heat when the requested temperature has been reached?

That is what I mean by turning the heat pump off.

Not actually turning it off, don't most people just leave them on permanently during the heating season and let the controls do the work?

I have a room thermostat but I am not using it to tell the heat pump when to stop and start heating. It is mainly an information centre and I use it to modify the weather dependent curve if necessary.

The only thing that tells my heat pump to stop heating is when the water returning to the heat pump is close to what it left at.

Reed_Richards

matt_drummer said:

 Your third party room thermostat must tell your heat pump to stop producing heat when the requested temperature has been reached?

Yes, exactly as it would with an oil boiler (or a gas boiler without Load Compensation).  Ever since I got a programmable room thermostat in 1998 (gas boiler) I have found that I like the room a bit warmer in the evening when I'm more sedentary than during the day when I'm more active.  So I have always programmed my heating to gradually increase in temperature during the day and then go off (or set-back) at night.  Your style of weather compensation is great if you want exactly the same room temperature 24/7 or, if your controller is clever enough, a day temperature and a night temperature.  But that's not what I want.  

matt_drummer

Reed_Richards said:

matt_drummer said:

 Your third party room thermostat must tell your heat pump to stop producing heat when the requested temperature has been reached?

Yes, exactly as it would with an oil boiler (or a gas boiler without Load Compensation).  Ever since I got a programmable room thermostat in 1998 (gas boiler) I have found that I like the room a bit warmer in the evening when I'm more sedentary than during the day when I'm more active.  So I have always programmed my heating to gradually increase in temperature during the day and then go off (or set-back) at night.  Your style of weather compensation is great if you want exactly the same room temperature 24/7 or, if your controller is clever enough, a day temperature and a night temperature.  But that's not what I want.  

And that is good, you can obviously have exactly what you want, I never suggested you couldn't.

I haven't seen any little bits of misinformation creeping into any replies so far, what I have missed?.

My controller can be programmed to move around from the weather compensation curve at multiple points each day.

It can also be moved manually on the Madoka controller or via the Daikin app.

I just want the heat pump to run at the lowest flow temperature possible with the least amount of cycling to achieve a house temperature that we are happy with.


But this is not about us, this is about the OP and their desire to use HIVE controls on their Grant heat pump.

Most people seem to favour using the manufacturers controls where possible and that is what has been suggested to the OP by me and others.

You favour a different approach but I think your heat pump is a bit older?


The OP actually wanted to solve their HIVE registration problem and I a few have questioned why they want to fit third party controls.

They seem to need to talk to HIVE about the registration issues and I think they are dealing with that.

cannugec5

It is up and running! 

The ASHP that is. 

It is set up by the installer as 2 zones - upstairs and downstairs. Up is set at a constant 18 degrees down 20. 

It has weather compensation.

The installer has installed HIVE thermostats- one up one down. 

I have eventually activated a HIVE account and registered the HIVE hub. 

My next challenge is to connect the thermostats to the hub without installing them from scratch ( as that is already done) and so far I’ve not found how to do that. 

I’m not in any great hurry. I’m not anticipating great use of the HIVE but I would like it if we’re able to go away for a holiday to turn it all down and then up again remotely 48 hours before return. I would not do this for a short trip or weekend away. But when I win the lottery I might just fancy a cruise! 

Reed_Richards

I've read that Grant buy-in their heat pumps from another overseas manufacturer but then dumb-down the controls.  I don't know if this is true, but if it is, you may be no worse off with Hive.  I'm glad you got your original problem sorted.

Edit:  Looked it up, Grant heat pumps are made by the Japanese company Chofu.  

cannugec5

I have, this afternoon managed to reset both thermostats in order to pair them with the hive hub. I followed a YouTube video that was so much clearer than the written instructions from Hive. It took me longer than it should because I thought I’d done something wrong first time, as it didn’t pair instantly. Once I realised patience was required the second one was a doddle.