Posts Tagged ‘Landscaping charlotte’

Automating the Control Circuit

Tuesday, November 24th, 2009

To automate the control of the pump you simply replace the manual switch in the circuit with an automatic switch. There are several types commonly used.

Types of Automatic Pump Switches:

•           Timer. Any electric timer can be used to turn the pump on and off at predetermined times. A relay is used to start and stop the high voltage pump using a low voltage timer, like a standard irrigation controller. With the right voltage relay, you could even hook the pump up to your computer!

•           Pressure Switch. Most well pumps are controlled by a pressure switch. The pressure switch turns on the pump when the pressure drops in the pipes, and turns it back off when the pressure gets too high. A typical installation will have a pressure tank which stores pressurized water so that the pump doesn’t cycle on and off rapidly due to pressure changes. The tank acts as a reservoir to stabilize the pressure in the system. Most pressure switches are adjustable, you can modify the on and off pressure settings within a limited pressure range, usually 20 to 45 PSI.

•           Irrigation Controller. Most irrigation controllers have a pump start circuit built into them. You simply connect the wires that go to the switch in the diagram above to the controller pump start terminals, and the irrigation controller will turn the pump on whenever it turns on a valve. Do not hook up the controller to an existing relay circuit. In other words if your pump already has a low voltage starter circuit with a relay you will need to install a new one for the irrigation controller. The controller has its own 24 volt AC power source, so if you hook it up to an existing circuit the irrigation controller may be damaged. If you don’t understand electrical circuits get an electrician to wire it for you!

•           Flow Switch. Flow switches are sometimes used on booster pumps. When the switch detects flow in the pipes it turns on the pump. So if you open a sprinkler valve, the water would begin to flow, and the pump would come on. This only works if the water is already pressurized and you want to use the pump to increase the pressure. An example would be a sprinkler system hooked up to the local water company pipes that needs more pressure than the water company provides.

•           Combination of one or more of the above switches. It is very common to combine one or more of the switches above so that the pump is turned on or off by any of several different events. A very common application is one relay controlled by both a pressure switch and a manual override switch, and a second relay operated by the irrigation controller. I often will add a flow switch to the irrigation controller relay, setting it to turn OFF the pump if there is no flow. For example, if one of the automatic valves fails to open when the controller tells it to, the irrigation controller would force the pump to continue running, even though there was no water flow! The pump would then over heat, since it uses the continuous flow of water through it to remove the heat, and the bearings would melt.

Source: http://www.irrigationtutorials.com

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On the Fairway, New Lessons in Saving Water

Monday, October 26th, 2009

When a few drops here and there are enough, workers use watering cans to moisten the greens at the Atlanta Country Club.

ATLANTA — Six years ago, when Georgia’s state government rewrote its rules for water use during droughts, it cut no slack for an obvious culprit: golf courses.

With emerald fairways that glistened even in the most blistering conditions, they were a tempting target.

Yet golf course managers were indignant. They argued that they were reining in water use in dozens of ways, like planting native grasses and auditing sprinkler spray patterns. Instead of being penalized, they said, they should be emulated.

It took a while, but from the South to the arid West, their wish is coming true. Mindful that global warming could provoke more and longer dry spells, state governments are increasingly consulting golf courses on water strategies.

In Georgia, golf course managers have emerged as go-to gurus on water conservation for both industries and nonprofit groups.

Marriott International is applying lessons learned at its golf course here to its resort properties in other states. Habitat for Humanity is landscaping front yards with drought-tolerant plants recommended by golf superintendents.

“Look, if you want to learn how to irrigate, these are the guys to ask,” said Garith Grinnell, who recently retired from the Southern Nevada Water Authority.

Such accolades are a turnabout for a business that is often faulted for harming the environment through excess use of water and pesticides.

In Georgia, the shift in perspective came about largely because of a crippling drought that peaked in 2007. By that year, 97 percent of the clubs that belonged to the Georgia Golf Course Superintendents Association had voluntarily adopted what are viewed as best-management practices for water use, reducing consumption, they estimated, by 25 percent in just three years.

Lake Lanier, Atlanta’s main source of water, had meanwhile dropped to record low levels, exposing muddy bottom not seen in half a century. It dawned on state and local water managers that golf courses might have some useful know-how.

Golfing grounds managers “are great technical assistance to me,” said Kathy Nguyen, president of the Georgia Water Wise Council, a state association of water professionals that encourages conservation. “I can call them up and talk to them about different technologies.” (Georgia’s drought eased significantly this year.)

Ms. Nguyen has relied on golf superintendents in drafting guidelines for homeowners like letting grass grow longer, fixing leaks in hoses as promptly as possible and keeping lawn mower blades razor sharp. (Grass cut by duller blades is more frayed and requires more water to stay healthy.)

The golf industry still draws strong criticism from environmentalists. Turf is, after all, the thirstiest of plants. The average American golf course drinks up some 50 million gallons of water a year — comparable to the yearly usage of 1,400 people. In the West, the figures are higher.

Yet that reality, coupled with rising water prices, is what led to strides like irrigating golf courses with “gray water,” or nonindustrial wastewater that is recycled for other purposes.

Tom Bancroft, chief scientist with the National Audubon Society, says that for all the progress golf has made, it remains a deeply problematic industry. Many courses “use fertilizers that can run off into fresh water, and many use pesticides in lawn and grass,” Mr. Bancroft said. (Audubon International, a separate group, works with golf courses to encourage wildlife preservation.)

Mark Esoda, superintendent of the Atlanta Country Club in suburban Marietta, where initiation fees are $85,000, acknowledges that practices among the nation’s courses range from indifferent to conscientious. But Mr. Esoda maintains that he and other superintendents have a lot to teach municipalities about watering their ball fields and homeowners about tending to their yards.

Zipping around the course on pine-shaded paths, Mr. Esoda stopped abruptly near the seventh hole. He gestured toward a patch of newly laid turf of zoysia, a warm-weather shade grass native to Southeast Asia and Australia. On shady parts of the course it is replacing fescue, a genus of cold-weather shade grass that can live through the winter and thus requires five months’ more watering and mowing.

Mr. Esoda said he had also installed affordable monitors that prevent automatic sprinklers from activating during or right after a rain.

And when isolated dry spots appear on the greens, he said, he sends staff members out with watering cans rather than turning on the sprinkler system.

Finally, Mr. Esoda has made an aesthetic adjustment after years of savoring the green glow of a perfect lawn. “Crispy around the edges is O.K.,” he confided.

Water is just one area where golf courses and environmentalists may find a rapprochement, said Anthony L. Williams, director of grounds at Marriott’s Stone Mountain public courses just outside Atlanta.

As metropolitan areas sprawl outward, golf courses may be the only large-scale green space for miles around, offering crucial potential habitat for migrating birds and other wildlife.

Mr. Williams, who has a degree in local horticulture, has been letting native grasses take over his lawns. Off the fairways he does not even bother to mow, and on the greens he is maintaining grass at one-sixteenth of an inch higher than typical courses. It makes playing slow, he allows, but “consistent.” He has also replaced all the flowering annuals with perennials, which generally require less water, choosing those that are attractive to native wildlife.

Since he took charge of the two courses in 2005, Mr. Williams has cut water consumption by 45 percent, he said, and witnessed the return of some wildlife species like the red-tailed hawk.

The changes have come with a price, like the occasional large brown spot on the fairway. But Mr. Williams says the golfers do not mind.

“I just stand out there on the greens and explain, ‘We are doing this so your grandchildren can come out here and play,’ ” he said. “People understand that.”

Source: www.nytimes.com

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How to Repair an Irrigation Solenoid Valve

Monday, October 12th, 2009

When a solenoid valve (also called an electric valve or automatic sprinkler valve) fails to close it is almost always because something is stuck inside it. This might be a grain of sand, a small twig, a insect, or even a tiny snail. To fix the valve you need to disassemble and clean it. When a valve fails to open it is usually due to a bad solenoid or bad wiring, although in rare cases a grain of sand stuck inside the valve or a ripped diaphragm inside the valve. The following instruction tells how to disassemble, clean, and inspect the automatic valve.

Source: http://www.irrigationtutorials.com

www.LawnTechLandscaping.com