Bob77 Posted October 8, 2022 Share Posted October 8, 2022 I have recently had a Daikin low-temp split heat pump fitted and it is partially commissioned (UFH not connected yet). I have noticed that the outdoor temperature reading is often too high - it was as high as 25C in the last couple of days and it certainly hasn't been that warm! I notice in the manual it refers to the temperature sensor being mounted on a north facing wall but the only north facing wall on my house adjoins the boundary so wasn't suitable for mounting the outdoor unit. So it faces slightly south of east and gets the morning sun on it. Am I right in thinking this is likely to mess up weather compensation? Eventually we hope to have some planting to screen the outdoor unit (at a safe distance) which should shade it to some degree but is there any other solution to this? It seems like on cold but sunny winter days the ASHP is going to think it is much warmer than it really is, and reduce the water temp accordingly. Link to comment Share on other sites More sharing options...
ProDave Posted October 8, 2022 Share Posted October 8, 2022 The sensor is probably inside a little plastic box and a little sun shining on it could well raise the temperature in that box to 25 degrees or more. I can't see what would have been wrong with a north facing wall on a boundary, it would not have got any sun so would be a more true reflection of outside temperature. Link to comment Share on other sites More sharing options...
Bob77 Posted October 8, 2022 Author Share Posted October 8, 2022 25 minutes ago, ProDave said: I can't see what would have been wrong with a north facing wall on a boundary, it would not have got any sun so would be a more true reflection of outside temperature. We have extended right up to the boundary on the north side, so there is not enough physical space for the unit (it would either be overhanging onto the pavement, and be exposed to damage from passers-by, or above a pitched roof and a PITA to access for maintenance). I'll just have to try to ensure that there is enough planting to shade the unit. Link to comment Share on other sites More sharing options...
JohnMo Posted October 8, 2022 Share Posted October 8, 2022 Cable length can be quite long - so shouldn't be an issue extending the cable length. Sun on it is no use, will make WC uncontrolled, which wont help you. Relocating it, is the only way to fix it, relying on plants isn't a good fix. Over or under reading consistently, isn't an issue, as you will be fine tuning the flow temps and curve when you commission. Link to comment Share on other sites More sharing options...
JohnMo Posted October 8, 2022 Share Posted October 8, 2022 2 minutes ago, Bob77 said: PITA to access for maintenance There is no maintenance Link to comment Share on other sites More sharing options...
Bob77 Posted October 8, 2022 Author Share Posted October 8, 2022 3 hours ago, JohnMo said: There is no maintenance Not what I was told by the installer who suggested that putting it above a pitched roof with no easy access would be a bad idea. Maybe he just didn't want to go up there! In any case I didn't really want the fan unit in full view on the side of the house facing the neighbours, it seemed better to have it where it can be hidden from view a bit. Anyway I will wait and see how the temperature goes. Hopefully on sunny days we will gain enough heat through the windows to make up for any loss in heating from the weather curve! Link to comment Share on other sites More sharing options...
HughF Posted October 9, 2022 Share Posted October 9, 2022 7 hours ago, Bob77 said: Not what I was told by the installer who suggested that putting it above a pitched roof with no easy access would be a bad idea. Maybe he just didn't want to go up there! In any case I didn't really want the fan unit in full view on the side of the house facing the neighbours, it seemed better to have it where it can be hidden from view a bit. Anyway I will wait and see how the temperature goes. Hopefully on sunny days we will gain enough heat through the windows to make up for any loss in heating from the weather curve! Of course the installer will tell you it needs maintenance, they want you to call them back once a year and pay them handsomely for the privilege. 🤣 Link to comment Share on other sites More sharing options...
JohnMo Posted October 9, 2022 Share Posted October 9, 2022 The temperature sensor can be remote from the fan unit, it's normally a small box 75x75x25mm sort of size. This is my temp sensor the small white spec. Your fan unit does need maintenance but not the temp sensor. 1 Link to comment Share on other sites More sharing options...
HughF Posted October 9, 2022 Share Posted October 9, 2022 On most ashp units the outdoor air sensor is just clipped to the evaporator guard. 1 Link to comment Share on other sites More sharing options...
JohnMo Posted October 9, 2022 Share Posted October 9, 2022 44 minutes ago, HughF said: On most ashp units the outdoor air sensor is just clipped to the evaporator guard. That's a bit cheap for a multi thousand £, piece of equipment. Link to comment Share on other sites More sharing options...
HughF Posted October 10, 2022 Share Posted October 10, 2022 18 hours ago, JohnMo said: That's a bit cheap for a multi thousand £, piece of equipment. Standard ashp - badge up a modified ac unit and charge a fortune for it 🤣 Link to comment Share on other sites More sharing options...
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