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Fujitsu Waterstage WOYG160LJL Air Source Heat Pump

 
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Air Source Heat Pumps (ASHPs)
Last Post by JamesPa 11 months ago
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 Barrovian1963
(@barrovian1963)
Eminent Member Member
Joined: 11 months ago
Posts: 16
Topic starter 24/02/2025 7:01 am  

@gary Good morning, thanks for taking the time to reply. Yes, you've described my system exactly. This is what I was suggesting I might try to @jamespa in my earlier post but you've expressed it much clearer. My thoughts were that if I left just one heatmiser connected I'd have a modicum of remote control over the ashp even if it was only a basic on / off. At the moment, I'm trying it with all the heatmisers set high to keep the actuators open to see how it goes. But I'll keep the removal idea in reserve. 

Thanks

John. 



   
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 Gary
(@gary)
Prominent Member Member
Joined: 3 years ago
Posts: 350
24/02/2025 8:05 am  

@barrovian1963 the thermostats are wirelessly connected to the wiring centre, the wiring centre is connected to the heat pump, when a thermostat calls for heat the wiring centre tells the heat pump to turn on and sends a signal to the actuators to open.

You don't need any actuators connected for the thermostat and wiring centre to tell the heat pump to turn on that side of things will still work correctly.

What I ended up doing was removing all the actuators and unpairing all of the thermostats from the wiring centre except the hall way one.  Now when the hall way calls for heat all of the circuits are open.



   
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 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 3904
24/02/2025 8:16 am  

Posted by: @barrovian1963
↑

@gary Good morning, thanks for taking the time to reply. Yes, you've described my system exactly. This is what I was suggesting I might try to @jamespa in my earlier post but you've expressed it much clearer. My thoughts were that if I left just one heatmiser connected I'd have a modicum of remote control over the ashp even if it was only a basic on / off. At the moment, I'm trying it with all the heatmisers set high to keep the actuators open to see how it goes. But I'll keep the removal idea in reserve. 

Thanks

John. 

Nothing wrong with a remote on/off switch.  I used to use my 40 year old hall thermostat that way when I had a boiler (as a thermostat it was essentially useless, its now redundant and removed).

 


This post was modified 11 months ago by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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 Barrovian1963
(@barrovian1963)
Eminent Member Member
Joined: 11 months ago
Posts: 16
Topic starter 24/02/2025 9:15 am  

Posted by: @jamespa
↑

3 times per hour is reasonable.  Are you sure it isn't doing defrost rather than cycling because of overcapacity?

Can I just ask a (another) basic question, going back to my obsession with cycling. What is considered a 'cycle'? Is one period on followed by an off period one cycle, or is it two cycles? i.e. on/off =1 or on/off =2 cycles. 

 



   
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 JamesPa
(@jamespa)
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Joined: 3 years ago
Posts: 3904
24/02/2025 1:18 pm  

Posted by: @barrovian1963
↑

Posted by: @jamespa
↑

3 times per hour is reasonable.  Are you sure it isn't doing defrost rather than cycling because of overcapacity?

Can I just ask a (another) basic question, going back to my obsession with cycling. What is considered a 'cycle'? Is one period on followed by an off period one cycle, or is it two cycles? i.e. on/off =1 or on/off =2 cycles. 

 

A period of on followed by a period of off is one cycle, but only if followed (or preceded) by more on-off periods.  One on/off transition on its own is a change of state.

 

 


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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 Barrovian1963
(@barrovian1963)
Eminent Member Member
Joined: 11 months ago
Posts: 16
Topic starter 24/02/2025 2:24 pm  

Posted by: @jamespa
↑

A period of on followed by a period of off is one cycle, but only if followed (or preceded) by more on-off periods.  One on/off transition on its own is a change of state.

So before I exhaust your patience completely, 10mins on 10mins off is one 20min cycle. Therefore it's cycling 3 times an hour and while not ideal shouldn't be grounds for too much concern? 

 

 



   
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 JamesPa
(@jamespa)
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Joined: 3 years ago
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24/02/2025 4:35 pm  

@barrovian1963 yes.  Not ideal but not disastrous either.  There are tricks to increase the period/reduce the frequency eg increase flow temp hysterisis if it's adjustable.  Once we get to say mid march you could consider timed heating if it suits your lifestyle.


4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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 Barrovian1963
(@barrovian1963)
Eminent Member Member
Joined: 11 months ago
Posts: 16
Topic starter 24/02/2025 4:59 pm  

@jamespa Thanks. I’m going to try and leave well alone for a while ( not to mention giving you a break from my constant questions ) and see how we go. If it’s ok then, I’ll come back in a month or so if I think further fiddling might help. 
cheers,

John. 



   
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 JamesPa
(@jamespa)
Illustrious Member Moderator
Joined: 3 years ago
Posts: 3904
25/02/2025 1:45 pm  

No problem if you want to ask more questions but without a doubt leaving these things from time to time is a good idea.  only by doing so do you get to find out what they really do and lead a normal life.


This post was modified 11 months ago by JamesPa

4kW peak of solar PV since 2011; EV and a 1930s house which has been partially renovated to improve its efficiency. 7kW Vaillant heat pump.


   
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