[TRNSYS-users] Trnsys 'counter'

[Farah Gammoh]

Hello,
I am trying to build a controller which switches a pump on every 3-Kelvin temperature increase. So the pump operates depending on the temperature increase and is independant of time.
till now i havent been able to figure out a way to store or 'recall' previous intermediate or output values within an Equation in order to achieve something like a 'counter' variable to which i can keep adding the temperature difference until its value reaches 3 or more.

Is there a way to do that in trnsys and how?

Thanks,
Farah