I had solar thermal installed recently, the system is a viessmann and goes with our viessmann boiler. The controls are on the boiler, seems to work well.
I spoke to viessmann technical after the install and they and the install advised to change the water heating from the boiler to only come on in the morning and evening when we would require it so that the solar could heat the water during the day.
I changed the timer to a mon-sun coming on at 0530 off at 0900 and again 1800 until 2200.
However the boiler now seems not to engage properly to heat the tank back up to 55 degrees.
On the control panel the cylinder prime pump is off when before it was on.
What setting in wrong?
I spoke to viessmann technical after the install and they and the install advised to change the water heating from the boiler to only come on in the morning and evening when we would require it so that the solar could heat the water during the day.
I changed the timer to a mon-sun coming on at 0530 off at 0900 and again 1800 until 2200.
However the boiler now seems not to engage properly to heat the tank back up to 55 degrees.
On the control panel the cylinder prime pump is off when before it was on.
What setting in wrong?