Forums

Forums
Renewable Heating
Air Source Heat Pum...
Is the Grant contro...
 
Notifications
Clear all

Is the Grant controller a thermostat?

 
Page 15 / 16
Air Source Heat Pumps (ASHPs)
Last Post by bretix 4 days ago
185 Posts
19 Users
67 Reactions
15.3 K Views
RSS
 Marvinator80
(@marvinator80)
Reputable Member Member
1309 kWhs
Joined: 2 years ago
Posts: 188
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. 


   
ReplyQuote
 Johnmo
(@johnmo)
Prominent Member Member
2092 kWhs
Joined: 2 years ago
Posts: 406
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.

 

Maxa i32V5 6kW ASHP (heat and cooling)
6.5kW PV
13.5kW GivEnergy AIO Battery.


   
ReplyQuote
 AllyFish
(@allyfish)
Noble Member Contributor
3573 kWhs
Joined: 2 years ago
Posts: 416
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.

 


   
👍
1
ReplyQuote



 Dodgyknee
(@dodgyknee)
Eminent Member Member
150 kWhs
Joined: 1 year 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.....


   
👍
1
ReplyQuote
 Marvinator80
(@marvinator80)
Reputable Member Member
1309 kWhs
Joined: 2 years ago
Posts: 188
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.


   
ReplyQuote
 Marvinator80
(@marvinator80)
Reputable Member Member
1309 kWhs
Joined: 2 years ago
Posts: 188
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. 😞 


   
ReplyQuote
 Johnmo
(@johnmo)
Prominent Member Member
2092 kWhs
Joined: 2 years ago
Posts: 406
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.

 

Maxa i32V5 6kW ASHP (heat and cooling)
6.5kW PV
13.5kW GivEnergy AIO Battery.


   
ReplyQuote
 Derek M
(@derek-m)
Illustrious Member Member
15282 kWhs
Veteran Expert
Joined: 4 years ago
Posts: 4433
11/09/2024 7:09 pm  

@marvinator80

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


   
👍
2
ReplyQuote
 Marvinator80
(@marvinator80)
Reputable Member Member
1309 kWhs
Joined: 2 years ago
Posts: 188
11/09/2024 7:26 pm  

@derek-m not yet. 

will try that.


   
👍
1
ReplyQuote



 Marvinator80
(@marvinator80)
Reputable Member Member
1309 kWhs
Joined: 2 years ago
Posts: 188
11/09/2024 7:27 pm  

@johnmo 

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


   
ReplyQuote
 Marvinator80
(@marvinator80)
Reputable Member Member
1309 kWhs
Joined: 2 years ago
Posts: 188
11/09/2024 8:10 pm  

@derek-m it worked. Thank you 🙏


   
👍
1
ReplyQuote
 Derek M
(@derek-m)
Illustrious Member Member
15282 kWhs
Veteran Expert
Joined: 4 years ago
Posts: 4433
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'?

 


   
👍
2
ReplyQuote
Page 15 / 16
Forum Jump:
  Previous Topic
Next Topic  

Currently viewing this topic 1 guest.

Share:

Join Us!

Latest Posts

x Powerful Protection for WordPress, from Shield Security
This Site Is Protected By
Shield Security →