In a startup sequence after winterization, which step comes last?

• A. Inspect for damage.
• B. Purge air.
• C. Energize the controller.
• D. Test each zone.

Answer: (D)

The step order tests your ability to sequence checks so the system is safe, reliable, and understood under real operating conditions. After winterization you first inspect for damage so any cracks, leaks, or broken heads are found and fixed before water is introduced. Next you purge air to clear any pockets in the lines; this prevents air locks and helps valves seat properly when water starts flowing. Then you energize the controller to bring the system online and verify that valves and electrical controls respond as they should. Only after these prerequisites are in place do you run a full test of each zone to confirm actual performance—correct head raise, spray patterns, coverage, and no leaks or overspray. Testing last allows you to confirm everything works together under pressure and with all zones active, rather than chasing problems that might be caused by air or faulty components.