MelCloud

[roadrunnerAlgarve]

I have a Mitsubishi Heat pump connected to a radiator system via a buffer tank. I also have a DHW tank connected to the heat pump.

On the MelCloud app, there is a provision to "Set tank Temperature"

Is this the buffer tank or the DHW tank?

It doesn't seem to match either in my case E.G Set temp 45C and buffer tank is 34C and DHW tank is 42C

If it is DHW tank and I change setting on MelCloud, does it adjust setting on FTC5?

 

 

[Thorfun]

Afaik it’s the DHW tank. I would’ve thought your buffer tank wasn’t Mitsubishi? Ours is a generic 3rd party buffer tank so the temp should be the cylinder. 
 

20 minutes ago, roadrunnerAlgarve said:

If it is DHW tank and I change setting on MelCloud, does it adjust setting on FTC5?

Yes

[roadrunnerAlgarve]

No the buffer tank is not Mitsubishi, but I think there must be an operative thermostat in this tank, because when the system was first installed and the FTC 5 was set on 50C , the buffer tank was at the same temperature.

I have just bumped up the setting on the app to 50C and will see what temperature is shown on the FTC5 DHW setting and the DHW tank tomorrow.

[Gill]

Caveat - unhelpful post (somewhat).

 

I have mitsubishi A2A linked up to MEL and that app is woeful. It reports my energy usage as 2kWh a day in winter which is lovely but very wrong.

 

Short of 'on' and 'off' I have no confidence in it even when all component are mitsubishi.

 

i hope it's just the AC system that suffers from this but I suspect it's not. I doubt it's playing nice with non integrated components. It doesn't even play nice with itself. 

[roadrunnerAlgarve]

I can confirm that if I change "Set tank Temperature" on the MelCloud app it changes the DHW water temperature setting on the FTC5 

With setting at 40C, the FTC5 shows a DHW temperature of 41C whilst the thermometer shows 44C. However, the probe is at 1/3 tank height and the themometer is at 2/3 height.

So one question resolved, but now need to find out where the heating system is getting it's room temperature reading!

[RichardL]

Similar feeling to above post by @Gill
Mitsubishi A2A -  tried Melcloud for about 5 minutes -  its not designed for home heating control really & anyway, feels more like large multi-site control. Central heating control over the cloud isn't something that makes sense to me. Monitoring solar over the cloud, sure, but control - nope - to many stacks of infrastructure in the way of reliably heating my house.

Reverted to using contactless control on each unit and a shelly to switch them on off.
If you use MAC-3971 units you can have 2x dry contacts for on/off and heat/cool - which is perfect for control by a shelly Uni.

A central oldschool single timeclock has a shelly i4 to distribute that single timed switching to 3 zones in the house and we're back to square one with simple single timer central heating control. i.e.
   - one clock for the whole house

   - simple up to 3x a day on/off

   - simple on/off/auto/all day setting

Another shelly i4 and control box will also provide a central 'heat cool' and 'we're out/in' buttons -  work in progress.

The remotes that came with the A2A units all still function if you need a local override..


DHW I left on immersion - 60p of electric on an overnight tariff tops it back up - not sure its worth getting more complex than that.