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I was looking at the position of the expansion vessel (neutral point) and the pump to ensure that the system was under positive pressure as far as possible.
Not sure why you would want it on the return.
The boiler will not be over heating, it will be reacting to the fact that the return water temperature is rising & it needs to modulate down to a low burn rate. Once it reaches the lowest setting & if the temperature continues to rise, as there is little system load, then it must turn the burner off until the temp fall & it can turn back on.
The point as previously stated is that it always has a good flow rate to base its this on.
Not sure why you would want it on the return.
The boiler will not be over heating, it will be reacting to the fact that the return water temperature is rising & it needs to modulate down to a low burn rate. Once it reaches the lowest setting & if the temperature continues to rise, as there is little system load, then it must turn the burner off until the temp fall & it can turn back on.
The point as previously stated is that it always has a good flow rate to base its this on.
