L
LesF
Hi
putting a little information back into the forum here, hope it helps someone.
We have a cottage we rent out that has a 200 litre vertical pressurised tank with a 2.4Kw 3 phase ceramic wire wound element (this is in France btw). 20 years old and still amazing on the heating and heat insulation for the water.
The thermostat packed up recently so a rather expensive replacement was purchased locally (70 Euro expensive!). The stat has a copper capillary heat sensor 37cms long, that goes up into the tank in a separate tube from the bottom of the tank, located next to the heater tube. The new stat had a different adjustment knob with a paddle on its side that limited how far you could adjust the on/off setting, though was part number correct.
The result was a tank full of scalding water as the thermostat was impossible to adjust to give a water temp that was safe. Ultimately the problem was solved by using up the hot water in the tank until it was tepid, with the heater off, then jumping the thermostat and turning the power on for an hour at a time until the tank water temperature was hot but wouldn't remove skin. Then I reinstated the thermostat and carefully adjusted its knob/stat to click off at this temperature - checked with a loop amp meter to be sure. However, the new stat with its knob with a paddle on it, still couldn't adjust correctly, so the old stat's knob without the paddle, was swapped over (quite easily) for the new, and success, on testing the water temperature from tepid again it was fine. The moral is that these types of stat seem incredibly sensitive and hard to adjust for a suitable temperature at the bottom of the tank, compared to scalding water at the top of the tank.
putting a little information back into the forum here, hope it helps someone.
We have a cottage we rent out that has a 200 litre vertical pressurised tank with a 2.4Kw 3 phase ceramic wire wound element (this is in France btw). 20 years old and still amazing on the heating and heat insulation for the water.
The thermostat packed up recently so a rather expensive replacement was purchased locally (70 Euro expensive!). The stat has a copper capillary heat sensor 37cms long, that goes up into the tank in a separate tube from the bottom of the tank, located next to the heater tube. The new stat had a different adjustment knob with a paddle on its side that limited how far you could adjust the on/off setting, though was part number correct.
The result was a tank full of scalding water as the thermostat was impossible to adjust to give a water temp that was safe. Ultimately the problem was solved by using up the hot water in the tank until it was tepid, with the heater off, then jumping the thermostat and turning the power on for an hour at a time until the tank water temperature was hot but wouldn't remove skin. Then I reinstated the thermostat and carefully adjusted its knob/stat to click off at this temperature - checked with a loop amp meter to be sure. However, the new stat with its knob with a paddle on it, still couldn't adjust correctly, so the old stat's knob without the paddle, was swapped over (quite easily) for the new, and success, on testing the water temperature from tepid again it was fine. The moral is that these types of stat seem incredibly sensitive and hard to adjust for a suitable temperature at the bottom of the tank, compared to scalding water at the top of the tank.
