Have ya monitored your in and out temps while using an ESBE thermic valve?
Last year I ran it the whole time without temp sensors on the in and out. After assembling a new control box and installing more sensors, a concern became evident. The recommended thermostat for return side is rated at 140 F, so that is what was used. What I saw early this season was very low return temps, 113, 119, 126, with temperatures out, 155, 170, 180 and such. Cripes there must be some debris keeping the valve open. So after a remove clean and replace things should be good. Well there was no debris visible to these bespectacled eyes, but still the assumption is that it will purr at 140 F. Wrong, same temps.
So maybe it is just a bad element. Got a replacement 140 F element all screwed in and guess what, same as before. Decided to order a 148 F and a 158 F. Installed the 148 and now things are good. Once the boiler reaches 150, the return temp runs about 145 on average until nearing the end when the bottom of storage is now hot also and the valve is wide open. Sometimes early on, it will drop to around 133 but it is a momentary thing.
This Danfoss valve is located on the return side upstream from the circulator. The return sensor is located between the circulator and the boiler. The boiler out sensor is after the other boiler loop tee. See picture below.
So, I feel good about how it is now working and wondering if anyone else has used one of these valves without sensors to monitor how well it is mixing.
![Reliability of Danfoss Thermic Valve Reliability of Danfoss Thermic Valve](https://www.hearth.com/talk/data/attachments/141/141827-885381879d33e60f02b5bcfee3e9c658.jpg)
Last year I ran it the whole time without temp sensors on the in and out. After assembling a new control box and installing more sensors, a concern became evident. The recommended thermostat for return side is rated at 140 F, so that is what was used. What I saw early this season was very low return temps, 113, 119, 126, with temperatures out, 155, 170, 180 and such. Cripes there must be some debris keeping the valve open. So after a remove clean and replace things should be good. Well there was no debris visible to these bespectacled eyes, but still the assumption is that it will purr at 140 F. Wrong, same temps.
So maybe it is just a bad element. Got a replacement 140 F element all screwed in and guess what, same as before. Decided to order a 148 F and a 158 F. Installed the 148 and now things are good. Once the boiler reaches 150, the return temp runs about 145 on average until nearing the end when the bottom of storage is now hot also and the valve is wide open. Sometimes early on, it will drop to around 133 but it is a momentary thing.
This Danfoss valve is located on the return side upstream from the circulator. The return sensor is located between the circulator and the boiler. The boiler out sensor is after the other boiler loop tee. See picture below.
So, I feel good about how it is now working and wondering if anyone else has used one of these valves without sensors to monitor how well it is mixing.
![Reliability of Danfoss Thermic Valve Reliability of Danfoss Thermic Valve](https://www.hearth.com/talk/data/attachments/141/141827-885381879d33e60f02b5bcfee3e9c658.jpg)