There is the following rule, relating to talking about the future:
Prediction can be used as a way of giving orders - instead of telling somebody to do something, the speaker just say firmly that it will happen. This is common in military-style.
Let I'm explaining somebody the working principle of a something device. Does the rule applied to that case. That is, for example
A device shall reset every one hour.
In general, it would be good if you provide a bit more examples reflecting the rule.