Rain Bird CP Manual de funcionamiento

Troubleshooting

and Maintenance Guide for

Residential Automatic Valves

Valves are an essential part of any sprinkler system. They are the link between the "brains" of the

system (the controller) and the sprinkler heads, to turn the water on and off.

Most automatic sprinkler systems are set up with two types of valves. A brass "gate valve" or "ball

valve" is usually located right after the "tee" where the sprinkler system cuts off from the main

source of water to the house. This valve, referred to as the "shutoff valve," is used to shut down the

sprinkler system for repairs or winterizing without shutting off the water to the entire house. It is rec-

ommended that all systems be equipped with a shutoff valve installed in a box for easy access.

Some systems also require the use of a back-flow preventer. Check local building codes.

The second type of valve is the sprinkler "zone valve." Each zone valve is piped to a set of sprin-

klers. When the valve is turned on, either by hand or in response to an electronic signal from the

controller, all the sprinklers piped to that particular valve go on. In most cases, there are several

valves located together (called a manifold). These are often in a valve box if underground.

Why are several valves needed? All systems are limited by a combination of the pressure of the wa-

ter (psi) and the number of gallons per minute (gpm) available. Each sprinkler uses a certain num-

ber of gallons per minute of water. This release of water through the nozzle reduces water pressure

to a certain degree while the system is working. For maximum performance, each zone is controlled

by one valve and is set up with the proper amount of sprinklers so that the psi and gpm capacity of

the system is not exceeded. The purpose of this information is to address questions and problems

related to zone valves.

Controller

Valve Box

Supply Line

Shut o

Valve

Supply Line

Water Flow

Zone

Valve

Zone

Valve

Water Flow

Controller Sprinklers

Sprinklers

BASIC AUTOMATIC

IRRIGATION SYSTEM

COMPONENTS

DIAGRAM

Types of Zone Valves

There are two basic types of zone valves commonly available.

Anti-Siphon Valves

Anti-siphon valves have a built-in backflow device to prevent

possibly contaminated water from flowing backward into the

household supply. If approved by your local codes, these types

of valves provide inexpensive backflow protection. Anti-siphon

valves must be installed at least 6" above the highest sprinkler

head on the line in order for the backflow device to work

properly. Both automatic and manual versions are available.

Anti-siphon valves are an inexpensive choice and easy to install and maintain. The built-in anti-

siphon backflow device prevents potential contamination of household water supplies from fertiliz-

ers and other toxic chemicals which may enter the system.

Check your local codes for the types of backflow protection required in your area. Electric models

are simple to hook up to a controller for automatic watering. They are best suited to plans where

there is not more than a slight rise in elevation, and fairly clean source water.

Caution: This valve is designed as a zone valve and as such may not

function properly, resulting in water contamination, if installed where

constant pressure is placed on the outlet (sprinkler) side of the valve. The manual version is not

suitable for use in a continuous open position as a main shutoff valve or as a means of inexpen-

sive backflow prevention for an entire system; nor are the automatic models to be used as a mas-

ter valve where other valves will be installed downstream.

Must be

at least

6” above

the

highest

sprinkler

Installation Notes

 Must be installed upright

 Must be installed at least 6"

(15,2 cm) above the highest

point of water in the pipe

and sprinklers it serves

 No valve can be located

downstream of the anti-

siphon valve

 Must not be subjected to

operating pressure for more

than twelve (12) hours in

any twenty-four (24) hour

period

 Uniform Plumbing Code

Sec. 1003 (2) 602.2 Con-

sult local codes

In-Line Valves

The second type of zone valve is an "in-line" valve. It is installed

below ground, preferably in a valve box for ease of maintenance.

A separate backflow preventer is required for backflow protec-

tion. In-line valves are automatic valves.

In-line valves are suitable for sites with all types of elevation

changes. Because of their protected location, in-line valves are

less likely to be tampered with by children or vandals, and less

likely to incur freeze damage than above ground models. An in-

line valve is also suitable for use as a master valve.

In situations where the water is pumped from a lake, well, ditch, or other "dirty" water source, sand

and other debris should be filtered from the line through a filter with a 100 mesh screen. If water sup-

ply is also used as a drinking water source, a separate backflow prevention device is required to pre-

vent potential contamination should fertilizers or toxic chemicals in the water be siphoned backwards

through the lines.

If your water is supplied by a municipal water system, check with your local Rain Bird dealer or

plumbing supplier for the type of backflow prevention device required in your area. For specific infor-

mation about backflow and the types of backflow prevention devices available, please call our toll-

free number. 1-800-RAIN-BIRD, and request a "Backflow Prevention Handbook."

Controller

To Sprinklers

Shuto

Service

Line from

Street

PVB Valve

Valves

Tips On New Installations

Tapping Into Your Water Source

Turn off the water at the meter. Cut into your household service line and install a system appropriate

tee, after the meter. The tee selected will depend on the type of service line piping. The cut can be

done anywhere on the line, depending on the layout of your system and the location of your first

manifold. Unless unregulated static pressure is over 80 psi, tap into the line before the household

pressure regulator. In freezing climates, you will probably be tapping into your source inside a base-

ment.

Next, install a gate or ball valve to act as your system shutoff valve. House the valve in a valve box

for easy access in below ground situations. Once this valve is installed and tested, the valve at the

meter may be left open for water usage inside the house. In freezing climates, your next step will be

to install a manual drain valve so that the water can be drained from the pipes between the zone

valves and the shut-off valve.

Install Schedule 40 PVC, thick-walled pipe up to the valves. In basement installations, you will need

to drill a hole through the wall to direct the pipe out to the valves. For convenience in "blowing out"

the system for winter, access to the line by means of a tee with a capped 1" riser may be installed at

this point.

If a backflow preventer is to be used, install it outside at the proper height.

Important: Remember to flush the line. Turn on the water at the shutoff valve and flush the pipes

free of dirt.

Meter in House

Meter in Yard

Service to

house

Compression

Tee

Shuto

Valve

Slope Downward

for Drainage

Shuto

Valve

Shuto

Valve

Water

Meter

Drain

Cap Service

Line

from

Street

Control

Valves

Service

Line to

House

Control

Valves

Shuto

Valve

Compression

Tee Water

Meter

Service

Line

from

Street

Water

Shuto

Installing the Valves

If you are installing a new in-line valve manifold, or grouping anti-siphon valves together, keep in

mind that the location should be easily accessible for maintenance. Locate the manifold where you

are not likely to be sprayed by the sprinklers when turning the system on manually. On larger sys-

tems, separate valve groups may be required for the front and back yards. It is a good idea to keep

a plan showing where all in-ground valves and pipes have been installed.

Important: Be sure to flush the line coming up to the valves, before installing the valves.

Tip: If using a manifold for underground valves partially assembling the manifold ahead of time will

make the job easier. Be sure that the valve is installed horizontally according to the arrows printed

on the body for the direction of flow. Valve operation may be erratic and valve warranty is void if in-

stalled backward or in a vertical position. Do not over-tighten or use any kind of pipe dope. Call our

toll-free Technical Services Hotline for any questions on system installation: 1-800-RAIN-BIRD.

WATER

FLOW

ARROW

Installing the Valves (Continued)

Most valves have a flush mode which allows a little extra water through the valve to clean it out. To

flush valve to clear debris: Turn the bleed screw counter-clockwise ONLY 1 turn. Flush one minute

and turn clockwise to close. Test and flush each line before sprinklers are attached.

How to Operate

Several models of Rain Bird 24 Volt valves are available for home use. Minimum current require-

ments for opening the smaller valves is .30 amps and for holding the valve open is .19 amps. Larger

valve models have slightly higher requirements. All Rain Bird valves are designed to work with Rain

Bird controllers and other controllers that have a power output sufficient to activate the valve. Your

Rain Bird valve offers some simple features you should be familiar with. Note: Some valves have

only part of these features.

See the diagram above for information on flushing the valves.

a. Flow control - Regulates the amount of water passing through the valve. Does not turn on or off

the valve. (Not available on all models.)

b. Flush Valve / Manual bleed - Turns the valve on manually by "bleeding" water off of the dia-

phragm. External bleed valve models have a knob or screw to turn and the water sprays out of the

top of the valve.

c. Manual On/Off - Turn solenoid 1/4 turn counterclockwise to turn valve on manually. Do not turn

past 1/4 turn or the Solenoid may come loose and release pressurized water.

Troubleshooting

How the Valve Works

It is easier to troubleshoot valves if you know a little about how the valve works. When an electrical

impulse is transmitted to the solenoid (black cylinder with wires), an electromagnetic field causes a

small metal plunger in the solenoid to move upward. When the plunger moves upward, a small hole

(port) in the valve is uncovered. Water in the chamber above the closing mechanism (either dia-

phragm or piston) flows through the port and out of the valve, relieving water pressure needed to

hold the valve closed. At this point, the pressure of the incoming flow of water is now greater than

the pressure in the chamber above the diaphragm, and the force of the water pushing up under-

neath the diaphragm opens the valve.

When the solenoid is de-energized, the plunger moves down, closing the small port. Water flowing

through a small hole in the closing mechanism refills the chamber above the diaphragm and builds

up pressure. The increased pressure forces the diaphragm downward, thus closing the valve. All

valves have a range of pressure and water flow that must be maintained in order to work properly.

Now that you have an idea of the way the valves work you can see why sufficient pressure and flow

are important. If a problem does occur, it is also very important to ensure that the small internal ports

are not blocked by debris. Adequate flushing is the key to success in a new installation.

Valve Cutaway Diagram

Diaphragm moves

up to open valve,

and moves down to

close valve.

TROUBLESHOOTING GUIDE

1. For any problem,

check the basics

first.

A. Is controller plugged in and properly programmed?

B. Is master shut off valve open?

C. Is flow control on valve in an "open" or "flow" position? Not all models have this fea-

ture. Check the instructions that came with your valve, or see "How to Operate" section

of this packet.

D. Are water pressure and flow rate adequate for your particular valve model? (Check

the instructions that came with the valve or call us toll free at 1-800-RAIN-BIRD for the

requirements of your particular Rain Bird valve model.) If your pressure is too low, in-

vestigate these causes:

 Pressure drain from washing machines, showers, etc. or broken pipe

 Master shutoff valve not fully open

 Blockage in main supply line; to repair, cut main line, flush line, and repair cut

 Too many heads on line; redesign system layout to reduce the number of heads op-

erating at once

 Inadequate pressure at the point of connection

E. Is valve in "Manual Off" position? See "How to Operate" section of this packet.

F. If your system is supplied by a pump, is it working?

SYMPTOM CAUSE DIAPHRAGM VALVE REMEDY

A. Check the Basics

as in No. 1 above

If all basics check out, see if the valve will work manually. On some

models you will need to turn the solenoid 1/4 turn counterclockwise. On

other models, turn the screw in the center of the bonnet (water should

spray out of the top of the valve temporarily). Check your valve operat-

ing instructions or refer to section entitled "How to Operate," in this

packet of information. If the valve works manually, go on to step 2-B. If

the valve doesn't work, go on to step 2-D.

2. Valve won't turn on

with controller

B. No power between

controller and valves

Check by pressing the "Manual Start" button of the controller and ad-

vance to the desired station. Attach a circuit tester (voltmeter) to the

common terminal and the station terminal of the controller. If you do not

get a 24-30 volt reading, the problem is in the controller.

Check for shorted or broken wiring. Follow directions as above, except

attach voltmeter to common wire and station wire nearest valve. If you

do not receive a 24-30 volt reading, replace or repair wiring.

C. Solenoid burned

out or clogged

The solenoid should make a distinct "click" when activated. If controller

and wiring check out, try unscrewing the solenoid and swapping it with

a nearby valve of the same model. Using the "Manual Start" on your

controller, check the station again to see if the borrowed solenoid acti-

vates the valve. If so. replace solenoid. If not check 2-D.

TROUBLESHOOTING GUIDE

SYMPTOM CAUSE DIAPHRAGM VALVE REMEDY

2. Valve won't turn on

with controller

(continued)

D. Valve opening

mechanism damaged

or clogged with debris.

See if you can flush debris from the valve by using the flush mode. If

not, turn off the water, disassemble, inspect and clean the valve (See

Diaphragm Valve Disassembly Procedure). Pay particular attention to

cleaning the small bleed ports underneath the solenoid and on the sur-

face of the diaphragm. Check to see that the diaphragm is not torn or

damaged. Replace diaphragm if damaged. If water is particularly dirty,

install a 100 mesh or finer filter before the valve to prevent future grit

build-up.

E. Valve installed

backwards

Reinstall valve so that water flow is the same direction as arrows em-

bossed on valve.

A. When the valve

won't turn off with the

controller, the fore-

most goal is to stop

the flow of water.

 Put controller in auto/off mode. If watering continues. . .

 Unplug controller. If this stops the watering, the problem is probably

in the controller. If watering continues. . .

 Turn flow control knob (if there is one) to lowest flow position. If this

does not shut off the flow completely. . .

 Turn off manual main shut off valve to sprinkler system

 When water flow is stopped, check steps B through D for trouble-

shooting procedure

3. Valve won't turn off

with controller

B. Solenoid burned

out or plunger clogged

Check solenoid as in 2-C. Check for dirt impeding the movement of the

plunger. To do this, turn off the water and remove power to the so-

lenoid. Unscrew the solenoid. Sometimes the plunger inside the sole-

noid can become stuck in the upward position due to dirt in the sole-

noid. Run water into the solenoid to dislodge dirt. Push a piece of wire

into the small hole in the retainer at the bottom of the solenoid to see if

the plunger inside will move up and down freely. If not. replace the so-

lenoid.

C. Valve closing

mechanism stuck in

open position due to

debris or damage

See Valve Disassembling Procedure A. Check small ports for blockage

by debris; rinse and inspect diaphragm and diaphragm seat for dirt or

damage. Replace diaphragm if damaged.

D. Damaged or misa-

ligned parts allow wa-

ter to leak from valve

Check valve body and bonnet for cracks. Check integrity of seal be-

tween body and bonnet and solenoid and bonnet. Repair or replace

parts as necessary to stop leak.

E. Valve set in

"Manual On" mode

Depending on the model, you will need to be sure the solenoid is tight-

ened into the full clockwise position ("Manual Off") or turn the bleed

screw or knob on top of the valve clockwise to tighten. See section enti-

tled "How to Operate."

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