Winterize Moana Nursery Irrigation System (usually in November for high desert):

  1. Close Supply Valve (turn clockwise completely).
  2. Open Test Cocks one quarter turn either direction (so the slot is horizontal).
  3. Turn Ball Valves one-eighth turn (so valve handles at 45 degrees to pipe).
  4. Open Manual Drain Valves (maybe more than one; turn counterclockwise completely).
  5. Turn System Controller Dial from Auto to Off.

  1. Two Test Cocks – – slot horizontal for winter and vertical for spring.
  2. Ball Valve handle at 45 degrees to pipe allows drainage from pressure vacuum
  3. Ball Valve handle at 45 degrees to pipe allows drainage to system (both handles in line with pipe in spring for start-up).

Remember: Must shut off water supply first.

Last … find and open manual drain valves (they may be in green box next to watering valves and wiring or in separate, capped tube; water should drain to a trickle).

Download PDF Version