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Is the Grant controller a thermostat?

 
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Air Source Heat Pumps (ASHPs)
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 Marvinator80
(@marvinator80)
Honorable Member Member
Joined: 3 years ago
Posts: 201
19/08/2024 10:53 am  

@johnmo no set backs in winter, just 24/7. I did get it to the point that it was working better but before that there were some days when it was very damp air and at 3/4 degrees just defrosting every 40 minutes or so all day so it struggled and then the outside temp would go to -5 at night. 

it ended up OK but it’s clear that we have missed out by not having a LLH or volumiser fitted. 



   
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 Anonymous 5011
(@Anonymous 5011)
Joined: 3 years ago
Posts: 562
19/08/2024 11:02 am  

Posted by: @marvinator80
↑

@johnmo no set backs in winter, just 24/7. I did get it to the point that it was working better but before that there were some days when it was very damp air and at 3/4 degrees just defrosting every 40 minutes or so all day so it struggled and then the outside temp would go to -5 at night. 

it ended up OK but it’s clear that we have missed out by not having a LLH or volumiser fitted. 

The grant volumiser are quite good. Hook up as per their instructions think they say in the return pipes.

 



   
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 AllyFish
(@allyfish)
Noble Member Contributor
Joined: 3 years ago
Posts: 518
19/08/2024 11:27 am  

@dodgyknee hi, here's Group 46 parameters changed from default for me, default in [ ]

46 00 = 3 [0] heater enabled in supplementary mode

46 01 = 45.0 [50.0] set this to your maximum design LWT in heating

46 02 = 1 [5] 1 min delay on heater activation in defrost

46 05 = 0 [600] no integration time, there's already a 1min delay above

46 11 = -20 [5.0] don't want compressor to disable when heater enables!

46 13 = -5.0 [5.0] I only want immersion to boost heating when it gets really cold, below -5degC

46 14 = 2.0 [5.0] and switch off when outdoor temp rises to -3degC

46 20 = 3 [0] this enables the immersion heater to boost defrost function & be a second heat source in really cold weather.

46 23 = 38.0 [24.0] set higher than default, as I want the heater to come on 1m after defrost start, by which time the LWT is falling and soon reaches 38degC. If it doesn't energise until 24degC it's not really of any benefit.

 



   
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 Dodgyknee
(@dodgyknee)
Eminent Member Member
Joined: 3 years ago
Posts: 14
Topic starter 19/08/2024 12:27 pm  

@allyfish 

That's fantastic, thanks for that. I'll just need to check the wiring now but hopefully I'll have some months before the temperatures get that low again.....



   
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 Marvinator80
(@marvinator80)
Honorable Member Member
Joined: 3 years ago
Posts: 201
11/09/2024 6:52 pm  

Oh God. 

I don’t know if I have done something to my Grant controller. 

I held in the buttons to check LWT and parameters earlier and now when I do it it doesn’t seem to work. Just goes to resetting the date and time. 

perhaps I am cracking up.



   
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 Marvinator80
(@marvinator80)
Honorable Member Member
Joined: 3 years ago
Posts: 201
11/09/2024 6:54 pm  

Oh God. 

I don’t know if I have done something to my Grant controller. 

I held in the buttons to check LWT and parameters earlier and now when I do it it doesn’t seem to work. Just goes to resetting the date and time. 

perhaps I am cracking up.

and when I press the Return only button it just beeps and does nothing else. 😞 



   
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 Anonymous 5011
(@Anonymous 5011)
Joined: 3 years ago
Posts: 562
11/09/2024 6:58 pm  

Posted by: @marvinator80
↑

Oh God. 

I don’t know if I have done something to my Grant controller. 

I held in the buttons to check LWT and parameters earlier and now when I do it it doesn’t seem to work. Just goes to resetting the date and time. 

perhaps I am cracking up.

and when I press the Return only button it just beeps and does nothing else. 😞 

Go on google (or other) and find and download a Chofu R32 installation manual. Everything you need to know will be in there.

 



   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
11/09/2024 7:09 pm  

@marvinator80

Have you tried powering it down, counting to 10 and switching back on?



   
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 Marvinator80
(@marvinator80)
Honorable Member Member
Joined: 3 years ago
Posts: 201
11/09/2024 7:26 pm  

@derek-m not yet. 

will try that.



   
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 Marvinator80
(@marvinator80)
Honorable Member Member
Joined: 3 years ago
Posts: 201
11/09/2024 7:27 pm  

@johnmo 

thanks john, I have the manual in front of me.



   
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 Marvinator80
(@marvinator80)
Honorable Member Member
Joined: 3 years ago
Posts: 201
11/09/2024 8:10 pm  

@derek-m it worked. Thank you 🙏



   
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 Derek M
(@derek-m)
Illustrious Member Member
Joined: 5 years ago
Posts: 4425
11/09/2024 9:15 pm  

Posted by: @marvinator80
↑

@derek-m it worked. Thank you 🙏

You should always try the 'Universal' reset first if possible.

Unfortunately poorly written software can sometimes get its 'knickers in a twist' when buttons are pressed in the wrong sequence, rather than issuing the message 'what on Earth are you doing Dumbo'?

 



   
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