Rain Bird's E-4C sprinkler timer features three programs with independent watering days, four watering start times per program, options to set any day of the week as an irrigation day, budgeting of water and battery backup. Using the sprinkler timer involves setting the current time and day and then programming---telling the timer when and how long you'd like to water. The timer sends a signal to open and shut the valves based on this data.
Select one of the three programs---A, B or C---by turning the programming dial to "Day Cycle" and pressing the "Program" button until "A," "B" or "C" shows on the display. Press "+" or "-" until the watering day cycle shows on the display. For example, "1" to "6" waters every one to six days, "Ev" waters on even days, and so on. Use the "Enter" button to confirm an option.
Set the program start time by turning the dial to "Prgm Start Time" and using the "+" and "-" buttons to choose a time. Press the "Enter" button to confirm and move to the next data entry.
Set the run times by turning the dial to the "Station Run Time" position, using the "+" and "-" buttons and pressing "Enter" to select or move forward.
Turn the dial to "Water Budget" to adjust the water budget. The number "100" will show on the display to indicate watering is at 100 percent. Use the "+" and "-" buttons to set the percentage. For example, setting it to "80" will reduce run time to 80 percent---so a 10-minute run time will run for eight minutes instead.
Turn the programming dial to "Auto" to run all of the Rain Bird E-4C sprinkler timer programs automatically.
Measure Your Yard
Use a measuring tape to measure the outside edges of your yard.
Draw the area of your lawn on a piece of graphing paper.
Use simple conversions, like 1 square equals 1 square foot of yard. If your yard is bigger, you can use 1 square equals 5 or 10 square feet of yard.
Placement of Sprinklers
Look on the label of your sprinkler head to determine what its radius is. Purchasing one that has a 15 foot radius will make calculating easy.
Use your graph paper to determine where your sprinklers will go.
Lay them out 15 feet apart, if you are using sprinklers with a 15 foot radius. If you are using a sprinkler with a 12 foot radius, place them 12 feet apart.
Look over the graph of your yard to make sure every area of lawn will be covered by your sprinklers.
Count how many sprinklers you have placed on your graph and purchase that many.
Insert the plastic key end of the Hunter adjustment wrench into the arc adjustment socket. This socket is located just above the beginning of the "Hunter" logo on the top of the sprinkler head.
Grasp the nozzle turret. Turn it all the way to the right stop point. Hold the turret in this position while adjusting.
Turn the wrench clockwise to increase the arc.
Turn the wrench counter-clockwise to decrease the arc.
Insert the steel hex tip of the Hunter adjustment wrench into the radius adjustment socket. Use a small, thin flat-blade screwdriver if the Hunter adjustment wrench is not available. This socket is located above the end of the "Hunter" logo on the top of the sprinkler head.
Turn the wrench counter-clockwise to increase the radius.
Turn the wrench clockwise to decrease the radius. Be careful not to turn the radius adjustment screw more than five full turns clockwise at risk of causing the screw to disconnect from the sprinkler head.
Grip the Weathermatic Turbo by the head of the unit. Turn the head clockwise to enlarge the arc of the water.
Turn on your sprinkler and test the arc. If you feel you need to readjust the arc, turn off the sprinkler.
Grip the sprinkler head, and twist it counterclockwise. Turn one the sprinkler again, and verify that the arc is how you would like it. Continue to adjust the sprinkler head until you get the arc the way you would like it.
Turn on the largest sprinkler station. Turn the master control valve all the way off, which will be counterclockwise. Watch the sprinklers and turn the valve slowly back on until the sprinklers reach their maximum throw. The sprinklers should not be throwing out any mist.
Make adjustments at the individual station valves. Once again, look for maximum throw without throwing out any mist.
Adjust the individual radius screw on top of the sprinkler head. This screw can usually be adjusted with a regular screwdriver (verify with your individual style of head) and will lessen or lengthen the throw of the sprinkler head.
Turn the center cap of the sprinkler to the right, using the palm of your hand, until it stops. Then turn the center cap to the left until it stops. This is the fixed left edge of the sprinkler.
Adjust the arc dial with the screwdriver. Turn the dial clockwise to increase the arc and counterclockwise to decrease it. Do not adjust the sprinkler past 40 or 360 degrees, as this can cause binding of the gears.
Adjust the spraying distance by turning the radius screw in the center cap with the screwdriver. Turn the screw clockwise to reduce the radius and counterclockwise to increase it.
Change out the nozzle of the sprinkler by first backing the radius screw out. Press the tab on the nozzle with the screwdriver to remove the nozzle from the sprinkler. Insert a new nozzle and screw the radius screw back in place.
Rotary Square Pattern
When shopping for a sprinkler, look for a good rotary that will deliver a square pattern and water evenly. This sprinkler is suitable for most soil types. The adjustments allow you to reduce the water volume for slower watering of poorly absorbing heavy-clay soils, or increase the volume for faster absorbing soils. The lawn should absorb all the water and not run down the sidewalk or driveway.
Another efficient sprinkler, the rotary-impact or pulsating sprinkler uses a water-driven flapper that hits an anvil and drives the nozzles in a circular pattern. These models are adjustable; change the circle diameter and water a portion of the circle, or change the droplet size. If you have a large garden with tall plants to water, choose a 72-inch-tall pulsating sprinkler.
Of the two, the rotary sprinkler with the square spray pattern is best. This sprinkler will fit smaller flower beds, and if you buy one on wheels, it makes moving it easier. The pulsating-rotary sprinkler, though effective, isn't as efficient because of some water wastage, but it does keep the water close to the ground to minimize drift and evaporation.
According to Allyn Paul, "A rain gauge should be used to find out how long it takes to lay down 1/2 inch of water based on your water output and sprinkler adjustment. You can get one at any garden center. Place it in the path of the sprinkler and check it often until it is up to the 1/2-inch line."