Hunter Institutional Series Instructions

®
ARC ADJUSTMENT
The I-20 Ultra pop-up sprinkler should be installed at
finished grade as shown in the illustration (Fig. 1).
Arc Adjustments:
Adjustable heads are preset to approximately 180º.
Sprinklers may be adjusted with water on or off. It is
recommended that initial adjustments be made
before installation.
1. Using the palm of your hand, rotate the nozzle
turret counterclockwise to the left stop to complete
any interrupted rotation cycle (Fig. 2).
2. Rotate the nozzle turret clockwise to the right
stop. This is the fixed side of the arc. The nozzle
turret must be held in this position for arc
adjustments. The right stop does not change.
To Increase the Arc:
1. Insert the plastic key end of the Hunter wrench into the adjustment
socket (Fig. 3 & 4).
2. While holding the nozzle turret at the right stop, turn the wrench
clockwise. Each full 360° turn of the wrench will increase the arc 90º.
3. Adjust to any arc between 40º and 360º (Fig. 5).
4. The wrench will stop turning, or there will be a ratcheting noise,
when the maximum arc of 360º (full circle) has been reached.
To Decrease the Arc:
1. Insert the plastic key end of the Hunter wrench into the adjustment socket (Fig. 3 & 4).
2. While holding the nozzle turret at the right stop, turn the wrench counterclockwise. Each full 360º turn of the
wrench will decrease the arc 90º.
3. Adjust to any arc between 40º and 360º (Fig. 5).
4. The wrench will stop turning, or there will be a ratcheting noise, when the minimum arc of 40º has been reached.
Increase Arc
Note: It is not necessary to disassemble the sprinkler to make adjustments.
RADIUS / DISTANCE OF THROW
Insert the steel hex end of the Hunter wrench into the radius adjustment screw
(Fig. 6). Turn the screw clockwise (into the stream of water) to decrease the
radius, or counterclockwise to increase the radius. Radius can be reduced up
to 25%.
Caution: Turning the adjustment screw clockwise more than five full turns
may result in a lost radius adjustment screw.
PRECIPITATION RATE ADJUSTMENT
If you have excessively wet or dry areas,
you can change the nozzle in the sprinkler
to increase or decrease the precipitation
rate. For dry areas, install a larger nozzle.
For wet areas, install a smaller nozzle.
Hunter Industries Incorporated • The Irrigation Innovators
www.HunterIndustries.com
Institutional Series™
Decrease Arc
Plastic Key End
Steel Hex End
Lifting
Socket
Arc
Adjustment
®
FloStop
Fig. 4
I-10 & I-20 Ultra
Gear-Driven Sprinklers
Fig. 1
Fig. 2
Nozzle
Locator/ Radius
Adjustment
Screw
A O
R F ADS
C F
I-20
Identification
Fig. 3
40º
360º
Minimum Maximum
Arc Arc
Fig. 5
Fig. 6
© 2002 Hunter Industries Incorporated
P/N 700053 LIT-053
Model
10/02