My controller says the boiler is 195 and won't go any higher, but my other thermostats all say 182 are there any tricks to get my water hotter in storage.
...the tank temperature will never quite make it to the boiler temperature.
woodsmaster said:My controller says the boiler is 195 and won't go any higher, but my other thermostats all say 182 are there any tricks to get my water hotter in storage.
Fred61 said:woodsmaster said:My controller says the boiler is 195 and won't go any higher, but my other thermostats all say 182 are there any tricks to get my water hotter in storage.
We are making the assumption that the supply (hot) is going to the top of the tank and the return is going from the bottom of the tank to the input of the boiler. Is that right?
Tennman said:WM, for what it's worth... My AZEL sensor on the last elbow where I enter the supply line pex to the house always reads about 10F less than what is set on the controller. This may not be your problem, but from what I see the Controller thermocouple must be somewhere in the boiler where it reads hotter than the final water exit temp at the top of the boiler. My Controller is set at 195F and I typically see in the neighborhood of 185F as it enters the PEX on it's way to the house. I can probably move the AZEL sensor and place it at the boiler exit to get a better reading on the controller to exit water temp bias or measurement error or whatever you want to call it. Some of mine is related to some small thermal loss due to piping, air separator, etc. But I don't think that even amounts to a degree.
dpsfireman said:Do you have enough flow between the boiler and tank? Where are the sensors on the tank, near the top or bottom? At any rate the tank temperature will never quite make it to the boiler temperature. I find that once my boiler temp maxes out the tanks will creep up but slowly.
Tennman said:I think there's something about the Controller's thermocouple placement in our BioMass 60's. If I'm burning tonight I may move one of my AZEL sensors to the tee at the boiler outlet. To reiterate, I've never seen exit water temps as hot as displayed by the controller.
dpsfireman said:I added an 82K resistor in parallel with temperature sensor to increase max temperature on my Biomass 25. At 194 F adding resistor changed indicated reading to 185 F. At 118 F adding resistor changed indicated reading to 111 F. This will raise the max temp by about 10 F to 205 F but the reading will be the same at 195 F. I did this calibration by disconnecting the sensor and connecting a potentiometer to the controller to simulate different temperatures. I would think that this approach would provide more consistent results than moving the sensor.
With the right size fire, that is one that may cause the boiler to idle a bit near the end of a burn I can get my tanks to about 202 F.
woodsmaster said:I ended up getting my output temp the same as the boiler temp. Yesterday I put a little to much wood in and had allmost the whole tanks to 195
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