G and J Posted July 29 Share Posted July 29 44 minutes ago, JohnMo said: MVHR summer bypass works in hot periods when outside air is cooler than the air being rejected. Therefore bypassing the heat exchanger. If the house is cooler than outside it should operate in normal mode. So cool the incoming air via the heat exchanger. Ah, so the summer bypass kicks in automatically? Presumably you can set threshold settings? Summer bypass on = external temp is greater than y degrees AND internal temp is greater than external temp Link to comment Share on other sites More sharing options...
Dave Jones Posted July 29 Share Posted July 29 zehnder call it season detection, you can edit the limits. Link to comment Share on other sites More sharing options...
JohnMo Posted July 29 Share Posted July 29 3 hours ago, G and J said: , so the summer bypass kicks in automatically? Presumably you can set threshold settings? On mine no, they are factory set. Link to comment Share on other sites More sharing options...
G and J Posted July 29 Share Posted July 29 47 minutes ago, Dave Jones said: zehnder call it season detection, you can edit the limits. I’m seriously looking at a Zhender unit. I’m now thinking the ASHP and the MVHR need to be linked. Link to comment Share on other sites More sharing options...
G and J Posted July 29 Share Posted July 29 1 minute ago, JohnMo said: On mine no, they are factory set. I guess this is like the difference between having aircon in a car and climate control. I’m thinking climate control for the house which would require control of both the MVHR and the ASHP from a single unit. But that sounds like (yet another) budget buster. Link to comment Share on other sites More sharing options...
JohnMo Posted July 29 Share Posted July 29 5 minutes ago, G and J said: guess this is like the difference between having aircon in a car and climate control. I’m thinking climate control for the house which would require control of both the MVHR and the ASHP from a single unit. But that sounds like (yet another) budget buster. Not really as @Dave Jones said earlier he had cooling on MVHR and it was not good. Ventilation and cooling are different animals, with very different flow rates required, I wouldn't mix together in one unit. Plus if one side breaks down you loose both. Cooling via your UFH loops in not too bad. Link to comment Share on other sites More sharing options...
Originaltwist Posted July 29 Share Posted July 29 16 hours ago, CalvinHobbes said: jeekers the fan coil units are a bit pricey! there's always this DIY fan-coil idea https://wordpress.com/post/originaltwist.com/2699 Link to comment Share on other sites More sharing options...
Dave Jones Posted July 29 Share Posted July 29 53 minutes ago, G and J said: I guess this is like the difference between having aircon in a car and climate control. I’m thinking climate control for the house which would require control of both the MVHR and the ASHP from a single unit. But that sounds like (yet another) budget buster. honestly dont bother. get fancoils instead. for example It's currently 30C outside, solar is close to maxed out. heat pump is set at 15c to the UFH loop and fancoils, upstairs is at 22.5 and falling. the heat pump will cut out in another hour or so once the slab is at temp and upstairs will sit at 20/21 downstairs little cooler. I have a bluetooth sensor we use to monitor, it says bathroom but its moved into one of the bedrooms at the moment. 1 Link to comment Share on other sites More sharing options...
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