1. Now I have the ability to do an IR Image assessment (thanks PaulO for the FLIR link) I have discovered in some instances of my 14 HR92's that the ambient temperature around them does not correspond with the set temperature or displayed temperature and typically some (but not all) of the HR92's read about 1°C higher than actual. So have have used the calibration facility to remove 1°C (setting = -1) where the HR92 is over reading.
2. What's been happening is there are a few locations where as I call it, a micro-climate exists around the HR92, for example one is in the corner of a room with little or no air movement around it and I can now see this creates a hotter spot and the offset is now corrected for. So you may wish to consider the same scenarios in your installations. Of course you can compensate by increasing the zone temperature to above that expected, perhaps 23°C for an achieved 21°C ambient.
3. Recently I set only one zone to come on early; our bedroom and heard the valve open at 04:00 (actually 04:02) as programmed, the heating began as I lay watching the room temperature projected on the ceiling () but to my surprised I heard the valve close a little after about 10-mins, the room turn-around time is about 20-mins from cold, then it turned (I presume) the heat off even more as it approached temperature. I found this interesting because it was the only zone on at that time, so why constrict water flow to achieve heat control, why not use the TPI to turn off demand earlier and leave the valve open? Interesting control logic I think.
2. What's been happening is there are a few locations where as I call it, a micro-climate exists around the HR92, for example one is in the corner of a room with little or no air movement around it and I can now see this creates a hotter spot and the offset is now corrected for. So you may wish to consider the same scenarios in your installations. Of course you can compensate by increasing the zone temperature to above that expected, perhaps 23°C for an achieved 21°C ambient.
3. Recently I set only one zone to come on early; our bedroom and heard the valve open at 04:00 (actually 04:02) as programmed, the heating began as I lay watching the room temperature projected on the ceiling () but to my surprised I heard the valve close a little after about 10-mins, the room turn-around time is about 20-mins from cold, then it turned (I presume) the heat off even more as it approached temperature. I found this interesting because it was the only zone on at that time, so why constrict water flow to achieve heat control, why not use the TPI to turn off demand earlier and leave the valve open? Interesting control logic I think.
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