Hunter Lawn Sprinkler Systems -
Sprinkler Adjustments - Hunter I-20 sprinkler
|The I-20 Ultra
pop-up sprinkler should be installed at finish grade as shown in
the illustration (Fig. 1).
Adjustable heads are preset to approximately 180°.
Sprinklers may be adjusted with water on or off. It is
recommended that initial adjustment be made before installation.
- Using the palm of your hand, rotate the nozzle turret
counterclockwise to the left stop to complete any
interrupted rotation cycle (Fig. 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
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
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
- Insert the plastic key end of the Hunter wrench into the
lifting socket of the sprinkler and turn 90°. Pull the
riser up to gain access to the nozzle socket (Fig. 8).
- Using the hex key of the Hunter wrench, turn the radius
adjustment screw (Fig. 6) counterclockwise to be sure it is
not blocking the nozzle socket opening. If a nozzle is
already installed, it can be removed by backing out the
adjustment screw and turning on the water, or by pulling
outward on the nozzle removal post with a pair of
- Slip the desired nozzle into the nozzle socket (Fig. 7).
Then tighten the nozzle range screw. The triangle on the
rubber cover will always indicate the location of the nozzle
and direction of water flow when the sprinkler is retracted.
RIGHT (FIXED) SIDE OF ARC
If the right side of the arc is not properly aligned, the
results may be a wet walkway or a dry turf area. The right side
arc can easily be realigned. One way to realign the right stop
is to turn the whole sprinkler body assembly and the fitting
below it, left or right to the desired position. This may
require temporary removal of the soil around the sprinkler to
allow you to grip the sprinkler housing.
Another way to reset the right arc is to unscrew the body cap
counterclockwise and remove the internal assembly from the body.
Once removed, rotate the nozzle turret to the right stop, screw
the internal assembly back into the body with the nozzle aligned
to the right side of the area you want irrigated (Fig. 9). At
this point you have realigned the right arc stop, and you can
adjust the left arc to an appropriate setting.
Note: It is not necessary to dig up and remove the
whole sprinkler to realign the right arc.
TURNING FLOW ON OR OFF
Insert the plastic key end of the Hunter wrench into the
FloStop adjustment socket (Fig. 3 & 10). turn wrench
clockwise to decrease or shut off the flow. Turn the wrench
counterclockwise to increase the flow.