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Grant ASHP - flow temp on display often nonsensical

 
Air Source Heat Pumps (ASHPs)
Last Post by Crimson 10 months ago
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 Crimson
(@crimson)
Reputable Member Member
Joined: 2 years ago
Posts: 214
Topic starter 20/11/2024 9:19 am  

I’m currently tweaking my Grant ASHP WC to get rooms to decent temperatures.

 

A very specific issue I’m seeing is upon checking the flow and return temps (hold down button 02 = flow, 09 = return), the flow most often is reporting nonsensical temperatures, eg 70C etc.

 

Is this common with Grant ASHPs?

 

It’s quite frustrating as I just have to refer to a weather reckoner sheet a forum user made to work out the temperature and check against some probes I have just before heating zone and around my LLH.

 

 



   
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Mars
 Mars
(@editor)
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Joined: 5 years ago
Posts: 3416
20/11/2024 9:49 am  

I suspect @allyfish might be able to shed some light on this.


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 AllyFish
(@allyfish)
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Joined: 3 years ago
Posts: 494
20/11/2024 4:30 pm  

Posted by: @crimson
↑

(hold down button 02 = flow, 09 = return)

Hi @crimson, I think field 2 is compressor discharge temperature, field 0 is return water temp, 9 is leaving water temp. Check the Grant installation manual.



   
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 Crimson
(@crimson)
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Joined: 2 years ago
Posts: 214
Topic starter 20/11/2024 4:52 pm  

@allyfish thanks! My awful memory had it completely wrong, that makes far more sense



   
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