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Are frost protection valves triggered by low air temperatures?

 
Air Source Heat Pumps (ASHPs)
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 daveheatpumpowner
(@daveheatpumpowner)
Active Member Member
25 kWhs
Joined: 1 month ago
Posts: 2
Topic starter 25/03/2024 9:57 am  

Does anyone know if frost protection valves are triggered by low air temperatures (say below a threshold of 3C), or when the water in the pipe gets to that temp? Its just that they seem pointless if they are triggered by the air, as the water can be kept warm by the frost-protection function running the pump when the air temp outside is below 6.

Mitsubishi told me that I don't need glycol to keep the warranty, as long as I have frost protection valves + the frost protection function enabled. My concern is that when the air temp falls below 3C, if the valves dump the water then I wont have heating, despite the frost-protection function stopping any risk of icing.

Obviously if there is a power cut at the same time as low temps then I'd need the valves to kick in, but this is an unlikely combination, especially as I have batteries. Would rather avoid glycol and its efficiency reduction if possible.

This topic was modified 1 month ago 3 times by Mars

   
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frost protection valve ai
Toodles
 Toodles
(@toodles)
Noble Member Contributor
5052 kWhs
Joined: 2 years ago
Posts: 776
25/03/2024 10:11 am  

The water temperature is the triggering element:

See: https://www.intatec.co.uk/product/anti-freeze-valves/#:~:text=Designed%20to%20discharge%20when%20the,costly%20damage%20to%20the%20system.

Regards, Toodles.

This post was modified 1 month ago by Mars

Toodles, 76 years young and hoping to see 100 and make some ROI on my renewable energy investment!


   
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 daveheatpumpowner
(@daveheatpumpowner)
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25 kWhs
Joined: 1 month ago
Posts: 2
Topic starter 25/03/2024 10:23 am  

@toodles Brilliant - thank you so much toodles!!


   
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