Carel controller settings

[Jack_H]

1 hour ago, dpmiller said:

are you reading the tank temperature off the controller, or off some other thermometer on the tank? Or the flow temp? Certainly on our iVT9 the flow exceeds tank setpoint so the top of the tank ends up quite a bit warmer than setpoint...

Do you actually see the tank actively heating to 50c or does it soak up a bit after shutting down @45? 

I'm reading the temperature of the cylinder temperature sensor which is displayed in the controller and app - the sensor is halfway up the cylinder...

Edited Wednesday at 19:31 by Jack_H

[dpmiller]

quite possibly just the stratification settling down in the tank, I'd say

[JohnMo]

12 hours ago, Jack_H said:

the issue I have is, my DHW setpoint is set to 45 degrees, however the tank keeps being heated to ~50 degrees. I'm assuming it's using the weather comp setpoint, but can't quite get my head around how that works for DHW.

Very unlikely to be WC as that doesn't normally work on dhw, as it aims to meet a setpoint. I would look at any hysterisis values in the controller. Is there an target plus x degs hysterisis programmed? From the above images, you looking for the stop temperature differential.

[Jack_H]

2 hours ago, JohnMo said:

Very unlikely to be WC as that doesn't normally work on dhw, as it aims to meet a setpoint. I would look at any hysterisis values in the controller. Is there an target plus x degs hysterisis programmed? From the above images, you looking for the stop temperature differential.

This is what I thought. My hysteresis is set to 10 degrees, however I can't see anything in the controller that looks like a differential stop for dhw...

[JohnMo]

12 minutes ago, Jack_H said:

My hysteresis is set to 10 degrees, however I can't see anything in the controller that looks like a differential stop for dhw..

It maybe doing plus 5 and minus 5? If you are getting 5 degs of overshoot, set the target lower and decrease hysterisis?

[Jack_H]

7 hours ago, JohnMo said:

It maybe doing plus 5 and minus 5? If you are getting 5 degs of overshoot, set the target lower and decrease hysterisis?

Yeah, I'll give this a try and report back. Cheers 

[Jack_H]

Well that didn't seem to make a blind bit of difference...

 

DHW setpoint changed to 40 degrees and hysterisis set to 5 degrees.

 

DHW heating cycle seemed to kick in around 40 degrees cylinder temp and went on to reheat to ~50 degrees. 🤷

 

 

 

 

[dpmiller]

the screenshot shows heating on, not DHW.

 

regardless, if it's anything like the setup in the Carel, there are four places setpoint is stored-

User Mask

Timezone. Adding anything here overrides user mask

Fan mode/ weather comp (default for DHW is 50 btw). Need to go into the engineers pages for that.

and the App. In my experience the App displays the Usermask data *until* the unit is actually running?

[Jack_H]

2 hours ago, dpmiller said:

the screenshot shows heating on, not DHW.

 

regardless, if it's anything like the setup in the Carel, there are four places setpoint is stored-

User Mask

Timezone. Adding anything here overrides user mask

Fan mode/ weather comp (default for DHW is 50 btw). Need to go into the engineers pages for that.

and the App. In my experience the App displays the Usermask data *until* the unit is actually running?

@dpmiller thanks for your response.

 

Yeah, it always displays heating when it's on and in a heating mode (either just heating or heating + DHW)

 

It looks like the settings are the same as the Carel ones you've described.

 

I therefore assume when in eco mode (weather comp), the DHW settings for each of the four setpoints should be set to my desired hot water temp? Also, unlike heating which is the flow temperature setpoint, am I right to assume for hot water it's the cylinder temperature setpoint?

 

Anyway, I've adjusted the eco settings to all be 45 degrees regardless of outdoor temp (see screenshot) - hopefully that does it 

 

 

[Marvin]

22 hours ago, Jack_H said:

I therefore assume when in eco mode (weather comp), the DHW settings for each of the four setpoints should be set to my desired hot water temp? 

This how my system is set and yes it heats up until the tank thermostat reaches the temperature set.