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Heatmeiser smart controls with ashp

 
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Air Source Heat Pumps (ASHPs)
Last Post by Derek M 1 year ago
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 EmmaJG
(@emmajg)
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Joined: 1 year ago
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Topic starter 06/11/2023 7:27 pm  

My house is overheating. My heatmeiser thermostat temps are being exceeded and I need to be able to reduce the temperature. If I reduce the desired room temp on the ASHP controls will that help?     I am really struggling to understand how room thermostats work in combination with the settings on the ashp? Will it ever be able to successfully set different rooms to different temperatures? Very grateful for any insight.

 


   
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 Derek M
(@derek-m)
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Joined: 4 years ago
Posts: 4429
06/11/2023 9:26 pm  

Posted by: @emmajg
↑

My house is overheating. My heatmeiser thermostat temps are being exceeded and I need to be able to reduce the temperature. If I reduce the desired room temp on the ASHP controls will that help?     I am really struggling to understand how room thermostats work in combination with the settings on the ashp? Will it ever be able to successfully set different rooms to different temperatures? Very grateful for any insight.

 

To be able to help resolve your problem could you please provide as much information about your system.

ASHP make and model.

How the heat pump controller has been set. Fixed Leaving Water Temperature (LWT) or Weather Compensation (WC)?

Radiators or Under Floor Heating (UFH)?

Any zones, buffer tanks etc.?

Knowing your level of technical ability would also be useful.

 

This post was modified 1 year ago by Derek M

   
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 EmmaJG
(@emmajg)
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Topic starter 06/11/2023 9:28 pm  

@derek-m. Thank you. It’s a Vaillant ASHP. Heatmeiser wireless thermostats. And underfloor heating.


   
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 Derek M
(@derek-m)
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Joined: 4 years ago
Posts: 4429
06/11/2023 9:43 pm  

Posted by: @emmajg
↑

@derek-m. Thank you. It’s a Vaillant ASHP. Heatmeiser wireless thermostats. And underfloor heating.

It is thought to be the case that Heatmisers and heat pumps don't play together very well, but don't panic all is not lost.

How familiar are you with the controls of your heat pump? Can you scroll through the different screens and make adjustments if necessary?

If your system has been installed as I suspect, if you operate one of the room thermostats to raise the temperature, the UFH controls should open one of the solenoid valves associated with the relevant UFH loop, start a UFH loop pump if fitted, and start the heat pump?

The heat pump will supply heated water to the UFH loop, which eventually will start providing thermal energy into the room. Dependent upon its design, UFH systems can react very slowly, so the heat pump may put too much thermal energy into the loops, which in turn may cause the rooms to overheat.

The system may eventually stabilise at the desired temperatures.

 


   
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 EmmaJG
(@emmajg)
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Joined: 1 year ago
Posts: 10
Topic starter 07/11/2023 9:22 am  

@derek-m The ASHP control has one heat zone only.  I reduced the desired temp on that last night by one degree to 21. No change yet but I understand it takes 24 hours. The thermostats are still showing between 24 degrees (where set for 18) and 21 degrees (where set for 20). Meanwhile, it looks as if the valve on the ufh control for the master bedroom is open (the top of the valve is raised a few mms but the red indicator remains unchanged).


   
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 Derek M
(@derek-m)
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Joined: 4 years ago
Posts: 4429
07/11/2023 9:34 am  

Posted by: @emmajg
↑

@derek-m The ASHP control has one heat zone only.  I reduced the desired temp on that last night by one degree to 21. No change yet but I understand it takes 24 hours. The thermostats are still showing between 24 degrees (where set for 18) and 21 degrees (where set for 20). Meanwhile, it looks as if the valve on the ufh control for the master bedroom is open (the top of the valve is raised a few mms but the red indicator remains unchanged).

Can you please provide closeup photo's of your heatmiser controllers and your heat pump controller.

 


   
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 EmmaJG
(@emmajg)
Active Member Member
Joined: 1 year ago
Posts: 10
Topic starter 07/11/2023 9:51 am  
IMG 3893
IMG 0903
IMG 0902

   
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 Derek M
(@derek-m)
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Joined: 4 years ago
Posts: 4429
07/11/2023 11:07 am  

@emmajg

Can you provide a photo of the unit(s) to which the wires from the solenoids are connected.

How many water pumps do you have on your system?


   
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 EmmaJG
(@emmajg)
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Posts: 10
Topic starter 07/11/2023 12:47 pm  

@derek-m I don’t know re water pumps. It’s a small detached house. Photo to follow


   
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 EmmaJG
(@emmajg)
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Posts: 10
Topic starter 07/11/2023 12:48 pm  
IMG 0904

   
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 Derek M
(@derek-m)
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Joined: 4 years ago
Posts: 4429
07/11/2023 1:57 pm  

Posted by: @emmajg
↑
IMG 0904

Thanks Emma,

So you have a small system with 6 UFH loops, two of which are permanently forced on by the red caps on the valves.

When you operate the heatmiser thermostat, do any of the LED's on the main unit come on, if so which?

Does the heat pump start and stop when the heatmiser thermostat is operated?

 


   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 4 years ago
Posts: 4429
07/11/2023 2:09 pm  

@emmajg

Do you know the settings of the weather compensation curve on the Vaillant controller?

The following video may help.


   
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