Ceasar's default and what is perfered by most users most of the time is for the springs to carry the sustained support load when the system is hot. In the sustained weight case, your load is your Hot Load plus or minus the hot dispalcement times the spring constant.
After the adding and subtracting is done, your springs are carrying a different load than if your system was hard supported. This Load is called the Cold Load. Since this load is different than the exact sustained load you will see some deflection at the springs.
Go to Caesar Spring Help. Caesar provides a lot of options for you to size your spring just they way you want them.
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NozzleTwister