There is a cold-state dz value on the support and hanger drawings – what does it mean?

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It is defined that +z represents an upward displacement, while -z represents a downward displacement. When checking the parameters of the hangers, there is a cold-state dz value of -0.3 mm on the drawing; I really don’t understand what this means. If anyone knows, please explain it to me. 1. What does cold-state dz mean? 2. From the diagram, the normal operating displacement of this support bracket is equal to hot-state dz minus cold-state dz, right? 3. If this cold-state dz is related to the pipeline, why is it indicated on the support and hanger drawings? 4. Also, regarding the cold-state marking of supports and hangers, must it be at the position where the positioning pin was inserted at the time of manufacture? 5. Must the spring hanger return to its position with the set pin in place when it is at room temperature? Please, an expert, answer this. Thank you! But definitely don’t answer off-topic; answering to something unrelated is really annoying.