Rain Bird PD210 PD-210 Pump Decoder User Manual

DECODER SYSTEM

MANUAL

DESIGN, INSTALLATION,

OPERATION and TROUBLESHOOTING

Rain Bird Golf Division

970 West Sierra Madre Avenue

Azusa, CA 91702

Phone: 800-984-2255 FAX: 800-446-5309

GT27141D November 2003

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Chapter

TABLE OF CONTENTS

DESCRIPTION PAGE

INTRODUCTION TO RAIN BIRD

DECODER SYSTEM 1

DESIGN 3

INSTALLATION

SURGE PROTECTION & GROUNDING

CENTRAL 57

SURGE PROTECTION & GROUNDING

DECODERS & WIRE PATHS 68

PROGRAMMING 80

TROUBLESHOOTING 108

ADDENDUM 145

Chapter

Introduction to Rain Bird

Decoder Systems

Rain Bird Decoder Systems are Unique Irrigation Control

Systems that Automate the Irrigation Process. Like all

Rain Bird Systems, they offer Reliable Two-Way

Communication. A Rain Bird Decoder Installation is

Always Capable of being Expanded and Upgraded.

The Rain Bird Decoder System provides dependable two-wire communication

between the Rain Bird Central Control System and the Decoders in the field. This

manual will provide a comprehensive overview of the design, installation,

operation and troubleshooting of a Rain Bird Decoder System. This first chapter

will provide a basic introduction to the Rain Bird Decoder Systems.

RAIN BIRD Decoder Irrigation Control System

A Rain Bird Decoder System offers two-wire communication comparable to satellite systems.

The difference is decoders, on the system, directly power the solenoids from the 2-wire path.

A Rain Bird Decoder System is programmed in the same way as any of the other Rain Bird

Computerized Central Control Systems utilizing field Satellite controllers. The major exception

is that instead of entering satellite and station identifications, decoder addresses are programmed

into the software. Once programmed, the software communicates through the Rain Bird

Decoder Interface (MDI unit) to the decoders in the field. This communication is carried

through a low-voltage two-wire communication path to the numerous decoders located

throughout the golf course. The decoders will directly activate the solenoids on the valve-in-

head rotors and/or remote control valves. The decoders act on command from the Decoder

Interface unit, or can be activated in the field using a Freedom System, communicating through

GT27141C Page 2 November 2003

the Rain Bird Computerized Central Control System. The decoders respond to a four-digit or

five-digit code. This code is used by the Central Software to address any of the decoders in the

field along the two-wire path.

Applications of a Rain Bird Decoder System

A Rain Bird Decoder system is an ideal irrigation control system for many applications. It is a

system that provides flexible installation, almost unlimited expansion, and future compatibility

for upgrading at some future date.

Architectural Elegance

A Rain Bird Decoder System provides transparent automatic control of the irrigation system.

There are no aboveground obstructions, making a decoder system ideal for an application in

which the environmental elegance of the course is to remain undisturbed. Automatic irrigation

control can be installed on a traditional Links style course without the obstruction of above

ground enclosures.

Designed for Protection From the Elements

The field components of a Rain Bird Decoder System are designed for underground burial, so

they are all completely weatherproof. This makes a decoder system a perfect application for a

golf course that is built in a flood plain. Anywhere that an automatic control system can be

damaged by the elements of nature a decoder system can be buried without fear of damage.

Resistant to Vandal Damage

Since all the decoders are underground, a decoder system is the solution to the problem of

vandal damage on an irrigation system. On a golf course where vandalism is a concern, a

decoder system allows all of the field components to be put underground and out of sight and out

of reach of vandals.

Flexible Installation and Simple Expansion

A Rain Bird Decoder System controls the field decoders with only a two-wire path running

between all the decoders and the Central Control equipment. This two-wire path carries all the

communication for the decoders as well as powering them for running the solenoids. Decoders

can be added to the field in any type of layout desired. This flexible installation simplifies the

installation process, and also allows the installation to be done in multiple steps. The decoder

system can be installed in part of a golf course initially. When more holes are to be added, they

can be connected to the rest of the system simply by splicing into the two-wire path on the

existing layout. If a sprinkler head needs to be added in the future, simply connect a decoder to

the existing two-wire path and add the address for this decoder to the software. This allows for

installation of a Rain Bird Decoder System in multiple steps and also for simple expansion of the

decoder system in the future.

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Chapter

Design of a Rain Bird

Decoder System

The Design of your Rain Bird Decoder System Layout

Is the Most Important Aspect of Ensuring that your

Irrigation Control System Functions Correctly and is

Easy to Maintain.

The design of a Rain Bird Decoder system requires careful consideration to the layout of the

decoder MAXI Two-Wire path∗. Since a decode system powers the electric solenoids through

the two-wire path, the two-wire path must be able to provide enough voltage to power the

solenoids. There are design specifications limiting the length of the two-wire Critical Path, the

number of decoder addresses on a given two-wire path, and the number of simultaneous, active

solenoids on a given two-wire path.

TWO-WIRE PATH LAYOUT – There are two types of configurations that can be used for the

layout of the MAXI two-wire paths∗. The MAXI two-wire path∗ can be installed as a STAR

configuration, or as a LOOP configuration. The Line Termination Box will supply up to five

separate two-wire paths, of the STAR configuration and up to two separate two-wire paths, of

the LOOP configuration for decoders. It is preferable to separate the two-wire paths into

multiple wire runs rather than install a single two-wire path throughout the golf course. These

wire paths can be configured in either the STAR or LOOP layouts or a combination of the two

types. Using the STAR configuration, the two-wire path can be branched throughout the course

but is NOT looped back to the Line Termination Box. Using the LOOP configuration, the two-

wire path is looped at the farthest reach of the layout, to provide for extended wire runs. For

ease of troubleshooting, the STAR configuration is the recommended layout for the two-wire

path.

∗ Refer to the Addendum for complete specifications for the MAXI wire.

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STAR CONFIGURATION for TWO-WIRE PATH – For normal installations `with wire

runs that are not excessively long, the recommended layout for the two-wire path is the STAR

configuration. This is to facilitate ease of troubleshooting the system should it experience a

wire fault or short. The distance of the farthest decoder from the LTB, LDI or SDI, measured

along the two-wire path, is considered the Critical Path of the two-wire run for a STAR

configuration. The maximum distance for the Critical Path is 1.5 miles for 16 AWG cable, 2.4

miles for 14 AWG cable, 3.8 miles for 12 AWG cable and 6.1 miles for 10AWG cable. For

metric cable the maximum distance for the Critical Path is 3.0 Kilometers for 2.5 mm² cable.

Refer to TABLE 2.1 for complete data. A diagram of the STAR configuration layout is

presented below.

FIGURE: 2.1

MAXIMUM CRITICAL PATH LENGTHS FOR TWO-WIRE PATHS

MAX. LENGTH FOR CRITICAL PATH

LOOP STAR

Nominal

Wire Size

Ohms per 1000’

Or Ohms per

Km Miles Km Miles

2.5 mm2 15.0 Ohms/Km 12.0 7.5 3.0 1.8

*16 AWG 4.09 Ohms/1000’ 9.6 6.0 2.4 1.5

14 AWG 2.58 Ohms/1000’ 15.2 9.6 3.8 2.4

12 AWG 1.62 Ohms/1000’ 24.4 15.2 6.1 3.8

10 AWG 1.02 Ohms/1000’ 39.2 24.4 9.8 6.1

TABLE: 2.1

* These sizes are not recommended due to insufficient physical strength of the wire.

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LOOP CONFIGURATION for TWO-WIRE PATH – If the installation requires longer wire

runs, than are possible with the STAR configuration, then a LOOP configuration may be used.

A LOOP configuration requires looping back the two-wire path from the farthest reach back to

the central location and connecting to a terminal in the Line Terminal Box. The main two-wire

path can be looped, and any branch paths from the main two-wire path can also be looped, from

the main line back to the main line. In a LOOP configuration, the Critical Path is the distance

measured by following the two-wire path around the loop out to the farthest decoder and back to

the central. The maximum distance for the Critical Path, for a LOOP configuration is 6.0

miles for 16 AWG cable, 9.6 miles for 14 AWG cable, 15.2 miles for 12 AWG cable and 24.4

miles for 10 AWG cable. For metric cable the maximum distance for the Critical Path is 12.0

Kilometers for 2.5 mm² cable. A diagram of the LOOP configuration layout is presented in

Figure 2.2.

FIGURE: 2.2

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12” x 18” Rectangular Valve Box with 2-Wire Cable Splice

to Facilitate Easy Breaking of the Loop for Troubleshooting Purposes.

SPLICES IN TWO-WIRE PATH – In all splicing locations of the two-wire path, for both the

STAR configuration and the LOOP configuration, all wires shall be clearly marked with

permanent type markings. The wire path should be marked to indicate the trunk wire coming

from the central, the trunk wire continuing out from the splice location and the branch wire off

of the trunk wire. For a LOOP configuration the branch marking should indicate branch LOOP

number. Near the center of each LOOP, in a LOOP configuration layout, make a splice and

place it in a 12” x 18” rectangular valve box. Provide three to four feet of excess wire in the

valve box so that splice may be easily brought above ground for working with it. This is

required for troubleshooting, so that the LOOP may be easily broken, otherwise it will be

impossible to troubleshoot this LOOP to find a short, etc. this method of breaking the wire

LOOP and the marking of all wires, at each splice location, are absolutely necessary to be able

to successfully and easily troubleshoot the system. (Refer to FIGURE; 2.3 below).

FIGURE: 2.3

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DECODER CHARACTERISTICS - Decoders are electronic components fully sealed within a

water-tight plastic enclosure that can be buried under-ground away from damage from vandals.

They are an especially good choice for flood plains and in other areas where the risk of satellite

damage is high.

Decoders replace satellites on centrally controlled irrigation systems. The decoders act

as switching stations for digitized commands to sprinkler heads and/or remote control valves.

Underground installation of the decoders and simple, low-cost wiring make decoders an

aesthetically pleasing and economical option for reliable in-field control.

Full in-field control can be realized on the decoder systems by the use of a “plug-in” Field

transmitting portable key pad or the integration of The Freedom system into the decoder system.

Advanced central control technology and simple wiring requirements of decoder systems have

made decoders and ideal choice in the renovation of golf courses. It is now possible to operate

satellites and decoders concurrently on the same central system. Decoder systems also lend

themselves to easy expansion of the irrigation system requiring a minimal amount of wire and

installation time.

DECODER ADDRESSES - The field line decoders, such as, FD-101, FD-102, FD-202,

FD-401, FD-601 and the SD-210 Sensor decoder come furnished with a “FIXED”

FACTORY pre-assigned, four or five-digit address code and are shipped to any particular

installation on a random basis.

The address for newer decoders (decoders produced since 1998) is re-programmable, however,

if this becomes necessary, by using the DPU-210, Decoder Programmer Unit available from

Rain Bird.

CHARACTERISTIC TABLE for VARIOUS DECODER MODELS

Decoder

Model

Number of

Addresses

Per Decoder

Maximum

Number of

Solenoids

Per Address

Maximum

Addresses

Operating

At Once

Current

Draw (mA)

At Rest

Per Decoder

FD-101 1 1 1 0.5 mA

FD-102 1 2 1 0.5 mA

FD-202 2 2 2 1.0 mA

FD-401* 4 1 4 1.0 mA

FD-601* 6 1 4 1.0 mA

TABLE: 2.2

Has LSP-1 Surge Arrestor built into it.

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PULSE DECODER

MODEL NUMBER NORMENCLATURE:

Number of Addresses

Digit)

1 0 2 = Model Number

Number of Solenoids per Each Output

Digit)

SENSOR DECODER – Model SD-210: Can be used either as a “SENSOR” Decoder or as a

“PULSE” Decoder. Refer to the “Sensor Decoder” Section immediately following this

chart.

PUMP DECODER – Model PD-210: Can be used to control a Pump Station or an Individual

Pump. Refer to the “Pump Decoder” Section following that for the Sensor Decoder below.

SENSOR DECODER – Model SD-210:

The SENSOR DECODER may be used either as a “SENSOR” Decoder or as a “PULSE”

Decoder. The decoder is told by the central system what type of device it is when it makes

contact with the system.

When used as a “PULSE” Decoder it is connected to a Pulse Flow Meter and sends the pulse

back to the Central Control System computer through the MDI Interface Unit for action then to

be taken by the Central System.

FLOW METER - Any type FLOW METER that has a “DRY“ Contact Pulse (“Dry”

contact pulse being a mechanical switch action only – NO voltage or transmitter

frequency being involved) may be used with the “PULSE” Decoder.

APPLICATION - The Pulse Decoder is generally used for;

1) Registration of “System” or “Zone” flow,

2) Search and Elimination of excess flow or adjustment of system under flow, and

3) For instant flow measurement.

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SENSOR DECODER

When used as a “SENSOR” Decoder it can be connected to any type of sensing device that has a

mechanical “DRY” switch action for the threshold setting, either an “OPEN” switch at the

threshold or a “CLOSED” switch at the threshold, and with NO voltage or frequency being

involved. The SENSOR status changes are transmitted through the MAXI Two-Wire

communication path and the MDI Interface unit to the Central Control System Computer, where

proper system action can take place.

APPLICATION - The most common application of the SENSOR Decoder is

in conjunction with such devices, such as:

1) A Rain Sensing device.

2) A Moisture Sensing device.

3) A Pump Alarm device, etc.

These devices in conjunction with the sensor decoder are used to Start, Stop, and Pause, Re-

adjust or Resume irritation programs.

CONSTRUCTION - The SENSOR decoder is housed and “potted” in a plastic

cylindrical case, similar to the FD-201 line decoder. The unit is completely “POTTED” green

making it waterproof so that it may be direct buried if necessary. The sensor decoder has a four

or five digit address code, just as the other field line decoders.

WIRING - The SENSOR Decoder has two (2) BLUE wires, which are to be connected to

the MAXI Two-Wire communication path. The BLACK wire and the RED wire are to be

connected to the sensor device for the purpose of receiving the sensing device input data. The

two (2) YELLOW and GREEN wires are from the LSP-1 surge arrestor, which is included in

the SD-210 sensor decoder unit. One of these wires should be connected to the sensing device

case and the other wire shall be connected to a ground rod, as specified and required for the

single LSP-1 surge arrestor .

INPUT FUNCTION - The input functions that the SENSOR Decoder is capable of,

are:

a) The Rain Bird Central System polls the Sensor Decoder for data when used as a

pulse decoder it can record 0-200 pulses/minute.

b) When used as 9-sensor decoder, the decoder records an open or closed switch

action.

All functions (also input type) are programmable from the Rain Bird Central System as an

integral part of the sensor installation.

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PUMP DECODER - Model PD-210:

The PD-210 PUMP Decoder can be used to control an entire Pump Station, an Individual Pump

and/or a Booster Pump.

The PD-210 Pump Decoder has a selector switch, which allows it to be set to respond to one of

six (6) possible address codes. Thus as many as up to six (6) PD-210 Pump Decoders may be

used on any given system, whether they are controlling Pump Stations, Individual Pumps,

Booster Pumps or any combination of these. The selectable address codes are as follows:

SELECTOR ADDRESS SELECTOR ADDRESS

SETTING CODE SETTING CODE

P1 = 284 P4 = 292

P2 = 286 P5 = 293

P3 = 287 P6 = 295

OUTPUT - The Pump Decoder only furnishes a “Dry Switch Closure” (no voltage output)

and capable of handling up to 240 Volts with a Maximum Current Capacity of 8 AMPs.

CURRENT DRAW - The Pump Decoder, when in the Idle state (not

Activated) has a current draw of less that 0.5mA.

HOLDING COIL - The HOLDING COIL of the Pump Motor Starter can be for any

operating voltage up to 240Volts and with a maximum current draw of 8 Amps. The power

supply for operation of the holding coil must come from some power source, as the Pump

Decoder furnishes NO POWER but only provides a “Dry Switch” closure.

The connection of the PD-210 PUMP Decoder into the Control System shall be as shown in the

diagram below – Refer to FIGURE: 2.4 on the next page.

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PUMP DECODER – MODEL PD-210

WIRING DIAGRAM

FIGURE: 2.4

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DECODER DESIGN PARAMETERS – In addition to the limitations that govern

the length of the two-wire Critical Path (refer to TABLE 2.1), there are guidelines to follow for

the maximum number of decoder addresses that can be placed on a given two-wire path, and the

number of “ACTIVE” solenoids that can operate simultaneously on a given two-wire path. The

limitations are based on the voltage drop through the Critical Path of the wire run. The

maximum allowable voltage drop is 9 VOLTS. In order to maintain the ability to provide

power to the decoders at the furthest extents of the two-wire path, the resistance of the wire path

musts NOT be greater than 33Ω (OHMS) TOTAL for all wire in the Critical Path. By sizing

the two-wire path and limiting the wire run distance according to TABLE: 2.1 (displayed on

previous pages) the resistance of the two-wire path will not exceed 33Ω. The

actual resistance can be calculated using the resistance’s found in TABLE: 2.3 (below).

RESISTANCE IN OHMS (Ω)

for

VARIOUS SIZES OF MAXI TWO-WIRE PATH CABLE

for ANNEALED COPPER WIRE

Nominal

Wire Size

Type of

Insulation

Resistance in

Ohms at 77° F

Size AWG

Wire

Type (UF)

Thickness

In Inches

Ohms

Per 1000’

16 AWG

14 AWG

12 AWG

10 AWG

Solid

4/64

4.09

2.58

1.62

1.02

METRIC WIRE SIZE DATA

Wire

Size

Wire

Type

Thickness

In Millimeters

Resistance in

Ohms at 25° C

2.0 mm

2.5 mm

3.0 mm

3.5 mm

4.0 mm

Solid

0.7 mm

19/Km

15/Km

13/Km

10/Km

8/Km

TABLE: 2.3

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DESIGN CRITERIA – For any given two-wire path the following criteria must be adhered to, as

shown in TABLE: 2.4 below.

CONDITION CIRRUS NIMBUS II NIMBUS STRATUS II STRATUS

& SDC-1

STRATUS LT

Ohms Total for

Critical Path

Calculation

33 Ohms 33 Ohms 33 Ohms 33 Ohms 33 Ohms 33 Ohms

Max Number of

Addresses per

Wire Path

250 250 250 250 250 200

Max Number of

Addresses per

MDI / LDI

500 500 500 500 500 200

Max Number of

Addresses per

SDI

500 500 500 500 500 200

Max Number of

“ACTIVE” Solenoid

per Wire Path

20 20 20 20 20 20

Interface Unit LDI/MDI LDI/MDI LDI/MDI LDI/MDI LDI/MDI SDI

Max Number of

“Active Solenoids

per Interface**

40 40 40 30* 20* 15

Current Draw

At Rest (mA)

FD-101

FD-102

FD-202

FD-401

FD-601

0.5 mA

1.0 mA

0.5 mA

1.0 mA

0.5 mA

1.0 mA

0.5 mA

1.0 mA

0.5 mA

1.0 mA

0.5 mA

1.0 mA

“ACTIVE” Solenoid

Current Draw (mA)

Golf (Green Coil)

“B” (White Wires)

“DV” (Black Wires)

20 mA

25 mA

15 mA

20 mA

25 mA

15 mA

20 mA

25 mA

15 mA

20 mA

25 mA

15 mA

20 mA

25 mA

15 mA

20 mA

25 mA

15 mA

Hybrid System

Max Number of

Interfaces per System

4 3 N/A 2 N/A N/A

TABLE: 2.4

* Software Limitation and Not an MDI Limitation.

** This number of decoders, on a large system with long wire runs, may reduce the

number of ACTIVE decoders that you will be able to operate at one time before the

Interface maximum current draw is exceeded and the Interface “SHUTS-DOWN”

(disconnects from the field wiring).

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CALCULATE VOLTAGE DROP – The voltage drop can be calculated using the known

resistance of the wire in the Two-Wire path and the cumulative non-active current draw for all

the decoders along the two-wire path, the cumulative current draw for all the “active” solenoids

on the two-wire path and allowing an additional 30 mA draw for the MDI Lights and SUP-210

surge arrestor are activated.

The calculation can be made using the following formula:

( I x R ) / 2 = V Where: I is current in AMPS (A)

R is resistance in OHMS (Ω)

V is Voltage in VOLTS (V)

GIVEN:

The MDI/LDI (Interface Unit) “Shuts Down” at a current draw of 1100 mA.

Use 1000 mA for design purposes! *

The SDI (Interface Unit) “Shuts Down” at a current draw of 500 mA.

Use 450 mA for design purposes! *

* To allow some safety factor, to handle small “leakage to ground” of current along the Two-

Wire path, which is bound to happen due to poor splices, small nicks in the insulation, etc.

use 1000 mA for design purposes.

Allow 30 mA for the MDI Lights & SUP-210 surge arrestor when active.

Therefore: MDI Lights & SUP-210 surge arrestor = 30 mA

340 (Inactive) Decoders = 340 x 0.5 mA = 170 mA

40 (Active) Solenoids = 40 x 20 mA each= 800 mA

“I” = Total = 1000 mA

BASIC DATA: - The basic data for a Decoder System is as follows:

500 Max.² = Decoder (Addresses) per MDI/LDI Interface Unit.

250 Max. = Decoder (Addresses) per Two-Wire Path.

40 Max. = Active Solenoids per MDI Unit (with 20 mA current draw – each).

20 Max. = Active Solenoids per Two-Wire Path (with 20 mA current draw - each).

9 Volts = Maximum Voltage Drop Allowable per Two-Wire Path.

30 mA (total)= for MDI Lights and SUP-210 when activated.

The LDI uses only 15 mA for the lights as it has a built in SUP-210 that draws no current.

GT27141D Page 15 November 2003

Green Golf Coil @ 20 mA Current Draw

0.5 mA Ea. = for Inactive Decoder (FD-210/FD-102 decoders).

1.0 mA Ea. = for Inactive Decoder (FD-410/FD-202; FD-401 & FD-610/FD-601 decoders).

15 mA Ea. = for Active “DV” Solenoid Coil with Black Wires.

20 mA Ea. = for Active “GOLF” Solenoid Coil (Green Coil).

25 mA Ea. = for Active “B” Solenoid Coil with White Wires.

230 Maximum Inactive Decoders (Addresses) per Two-Wire Path. (250 minus 20 active)

20 Maximum Active Solenoid Coils per Two-Wire Path.

² Although the MDI can handle a maximum of 500 decoders (addresses) total – with any number

over a total of 380 decoders (addresses) the number of active decoders that you will be able to

operate at one time, will be reduced.

EXAMPLE CALCULATION

MDI Lights & SUP-210 when activated = 30 mA

230 Inactive Decoders = 230 x 0.5 mA = 115 mA

20 Active Golf (Green) Solenoids x 20 mA = 400 mA

“I” = Total mA = 545 mA = .545 A

#14 AWG Cable Size for Two-Wire Path @ 2.58 Ω/1000 ft.

Critical Path Length = 2.4 Miles = 2.4 x 5280’ = 12,672 Feet Total

“R” = 12.67(1000’s of feet) x 2.58Ω/1000’ = 32.68 Ω

SUBSTITUTE: (in basic formula)

V = I x R / 2

.545A x 32.68 Ω

V = = 8.90 Volts Drop

GT27141C Page 16 November 2003

“B” Coil w/White Wires @ 25 mA Draw

METRIC CALCULATION:

2.5 mm² Cable Size for Two-Wire Path @ 15 Ω/Km

Critical Path Length = 2.2 Km

“R” = 2.2 Km x 15Ω/Km = 33.0 Ω

“I” = .545 A

.545A x 33 Ω

V = = 8.99 Volts Drop

EXAMPLE CALCULATION

MDI Lights & SUP-210 when activated = 30 mA

230 Inactive Decoders = 230 x 0.5 mA = 115 mA

20 Active Golf (Green) Solenoids x 25 mA = 500 mA

“I” = Total mA = 645 mA = .645 A

#14 AWG Cable Size for Two-Wire Path @ 2.58 Ω/1000 ft.

Critical Path Length = 2.4 Miles = 2.4 x 5280’ = 12,672 Feet Total

“R” = 12.67(1000’s of feet) x 2.58Ω/1000’ = 32.68 Ω

SUBSTITUTE: (in basic formula)

V = I x R / 2

.645A x 32.68 Ω

V = = 10.54 Volts Drop (Over 9 Volts)

GT27141D Page 17 November 2003

Under this condition you would NOT be able to operate 20 of the “B”

type solenoid coils Simultaneously.

16 Solenoids Max. that

can be operated Simul-

taneousl

The total current draw cannot exceed 545 mA. There is a current draw of 145 mA with

the MDI Lights & SUP-210 and the 230 Inactive Decoders on the Two-Wire Path.

Therefore;

545 mA total minus 145 mA = 400 mA allowable for the Active Solenoids

@ 25 mA per solenoid 400 mA divided by 25 mA =

This can be checked as follows:

#14 AWG Cable Size for Two-Wire Path @ 2.58 Ω/1000 ft.

Critical Path Length = 2.4 Miles = 2.4 x 5280’ = 12,672 Feet Total

“R” = 12.67(1000’s of feet) x 2.58Ω/1000’ = 32.68 Ω

“I” = .545A

SUBSTITUTE: (in basic formula)

V = I x R / 2

.545A x 32.68 Ω

V = = 8.90 Volts Drop (Under 9 Volts)

Under these conditions and using the “B” type solenoid – the maximum number of

solenoids that may be operated simultaneously is 16.

GT27141C Page 18 November 2003

SYSTEM EXAMPLE CALCULATIONS

STAR TWO-WIRE PATH CONFIGURATION: -

18 HOLE COURSE

2 – TWO-WIRE PATHS IN STAR CONFIGURATION – One for front nine holes & one

for back nine holes.

36 FD-410/FD-202 decoders – with 2 at each Green operating 2 Solenoids (Golf Coils –

Green) each solenoid at 20 mA current draw.

18 FD-410/FD-202 decoders on each of the Two-Wire paths.

400 FD-210/FD-102 decoders on entire system.

200 FD-210/FD-102 decoders on each Two-Wire path.

10 FD-410/FD-202 decoders desired to operate at one time on a Two-Wire path.

(2 solenoids on each decoder equaling 20 solenoids total, which is the maximum that

can operate simultaneously on a Two-Wire path.)

Critical Two-Wire path length = 2.2 Miles

Wire size is #14 AWG cable @ 2.58 Ω/1000’

CALCULATION:

“R” = 2.2 Mi. x 5280’/Mi. = 11,616 feet total length

= 2.58Ω/1000’ x 11.626 (1000’s of feet) = 30.0 Ω

“I” = MDI Lights & SUP-210 when activated = 30 mA

200 (Inactive FD-210/FD-102 @ 0.5 mA each) = 200 x 0.5 mA = 100 mA

8 (Inactive FD-410/FD-202 @ 1.0 mA each) = 8 x 1.0 mA = 8 mA

10 (Active FD-410/FD-202 w/2 coils each @ 20 mA per coil

or 40 mA total for each decoder) = 10 x 40 mA = 400 mA

TOTAL = 538 mA

“I” = .538 A

I x R .538 A x 30.0 Ω

V = = = 8.07 Volts Drop

2 2

GT27141D Page 19 November 2003

GT27141C Page 20 November 2003

OOP TWO-WIRE PATH CONFIGURATION: - In order to

calculate the voltage loss for a “LOOP” type Two-Wire path you must first convert

the LOOP system into an equivalent “STAR” type system for determining the Critical

Path Length for the Two-Wire path. Refer to FIGURE: 3.4 shown below.

FIGURE: 2.5

NOTE ! In referring to FIGURE: 2.5 above, you will note that the “Equivalent

Loop Length” in the STAR configuration, is ¼ (one fourth) the total

Length of the LOOP in the LOOP configuration.

The length of Section #1 of the LOOP is = 800’ + 2250’ + 800’ + 1800’ + 2600’ = 8250 feet.

The length of Section #2 of the LOOP is = 1000’ + 5500’ = 6500 feet.

CONVERTING A “LOOP” TWO-WIRE PATH TO AN

EQUIVALENT “STAR” TWO-WIRE PATH

GT27141D Page 21 November 2003

Thus the “Equivalent Loop Length” of the LOOP is:

8250’ + 6500’ 14,750 ft

= = 3688 feet

4 4

The Critical Path Equivalent Length = 4500’ + 3688’ + 7500’ = 15,688 feet

Wire size is #14 AWG cable @ 2.58 Ω/1000’

CALCULATION:

“R” = 15.7(1000’s of feet) x 2.58Ω/1000’ = 40.5 Ω

“I” = MDI Lights & SUP-210 when activated = 30 mA

200 (Inactive FD-210/FD-102 @ 0.5 mA each) = 200 x 0.5 mA = 100 mA

8 (Inactive FD-410/FD-202 @ 1.0 mA each) = 8 x 1.0 mA = 8 mA

10 (Active FD-410/FD-202 w/2 coils each @ 20 mA per coil

or 40 mA total for each decoder) = 10 x 40 mA = 400 mA

TOTAL = 538 mA

“I” = .538 A

I x R .538 A x 40.5 Ω

V = = = 10.9 Volts Drop∗

2 2

∗The voltage drop is in excess of 9 Volts, therefore the wire

size needs to be increased or less solenoids operated in order to

reduce the current draw and result in a lower voltage drop.

To calculate the number of solenoids that could be operated simultaneously – keeping the same

wire size . . .

9 Volts = Maximum Voltage Drop Allowable

“R” remains the same at 40.5Ω

GT27141C Page 22 November 2003

OTE ! As long as the voltage drop is equal to or less than 9 volts, the two-

wire path will be able to power all the decoders.

Solve for the maximum current allowable under these conditions to stay at 9 Volts or less voltage

drop.

V x 2 9V x 2 18

I = = = = .494 A

R 40.5Ω 40.5Ω

MDI Lights & SUP-210 when activated = 30 mA

200 (Inactive FD-210/FD-102 @ 0.5 mA each) = 200 x 0.5 mA = 100 mA

8 (Inactive FD-410/FD-202 @ 1.0 mA each) = 8 x 1.0 mA = 8 mA

Total = 138 mA

494 mA – 138 mA = 356 mA available

At 20 mA draw per solenoid - 356 mA divided by 20 mA = 16 solenoids

maximum

can be operated simultaneously on this LOOP Two-Wire Path. This

would limit the system to 8 FD-410/FD-202 decoders operating simultaneously

GT27141D Page 23 November 2003

SECONDARY PATH WIRE RUN – In addition to the parameters for sizing the Primary Two-

Wire Path Wire Run, there are considerations for the Secondary Path Wire Run. The

Secondary Path Wire Run is the wire path connecting the

decoder output to the electric solenoid on the valve-in-head sprinklers or the remote control

valves. The maximum total wire path length, from the decoder to the farthest solenoid, for

different wire sizes is given in TABLE: 2.5 below. For a single solenoid being connected to the

decoder output, the length, from the decoder to the solenoid, may be taken directly from the

table. When two (2) solenoids are being connected to the decoder output, the total length is the

distance from the decoder to the first solenoid plus the distance again from the decoder to the

second solenoid. (Refer to FIGURE: 2.6 below).

MAXIMUM WIRE RUN LENGTHS

for

SECONDARY PATH WIRE RUNS

Wire Size Secondary Wire Run Lengths

METERS FEET

1.5 mm² 100 328

2.0 mm² 133 436

2.5 mm² 166 545

16 AWG 88 289

14 AWG 139 456

12 AWG 220 720

TABLE: 2.5

For a single solenoid connected to the decoder output, the maximum length may be taken

directly from the TABLE: 2.5 above.

When two (2) solenoids are connected to the decoder output, the total maximum length shall be

as calculated in the example in FIGURE: 2.6 below.

GT27141C Page 24 November 2003

Electric Solenoid on Valve-in-head

Sprinkler or Remote Control Valve

White

DECODER White

115 feet

Blue 35 meters

Blue

213 feet

Connect to

2-wire path 65 meters

115 ft. + 213 ft. = 328 ft. - Use size 14 AWG wire

35 M + 65 M = 100 M - Use size 1.5 mm² wire

DECODER

SECONDARY WIRE RUN CALCULATION

for

TWO SOLENOIDS CONNECTED to the DECODER

OUTPUT

FIGURE: 2.6

The maximum total length of the secondary wire path, when two (2) solenoids are connected to

the decoder output, is defined as the sum of the wire path distance from the decoder to the first

solenoid plus the wire path distance again from the decoder out to the second solenoid. This

means that the section of the wire path that is powering both of the solenoids (the 115 feet/35

meter length in Figure: 2.6) is counted twice.

GT27141D Page 25 November 2003

FIELD SPECIFICATIONS – Each two-wire path must NOT exceed the maximum wire run

for its Critical Path. (Refer to FIGURES – 2.1 & 2.2 for Critical Path measurement and refer

to TABLE 2 .1 for maximum Critical Path lengths.) A maximum of 250 single address

decoders (FD-102) may be connected on a given two-wire path. A maximum of 125 Multi-

address decoders (FD-202, FD-401, or FD-601) may be connected on each two-wire path. Or

any combination of Single Address decoders and Multi-address decoders may be combined on a

given two-wire path as long as the TOTAL Non-Active current draw does not exceed 115 mA.

A maximum of 500- single address decoders (FD-102) may be connected to any individual MDI

Interface Unit. A maximum of 250 Multi-address decoders (FD-202, FD-401, or FD-601) may

be connected on any given MDI Interface Unit. Or any combination of Single Address decoders

and Multi-address decoders may be combined on a given MDI Interface Unit as long as the

TOTAL Non-Active current draw does not exceed 230 mA. (Refer to TABLE 2.4 for

complete information). The maximum number of “ACTIVE” solenoids on any given two-wire

path is 20. The FD-102 decoders powering 2 solenoids each is considered as TWO “ACTIVE”

SOLENOIDS even though using only ONE address. The maximum number of “ACTIVE”

solenoids on any given MDI Interface Unit varies by SYSTEM TYPE. (Refer to TABLE 2.4 for

maximum number of solenoids for each type system.)

It should be noted that the requirement is for a maximum number of SINGLE ADDRESS

DECODERS and/or MULTI ADDRESS DECODERS and not JUST the number of Decoders.

An FD-101 and FD-102 is ONE decoder address and thus a Single Address Decoder.. Likewise,

the FD-202 is TWO decoder addresses, the FD-401 is FOUR decoder addresses and the FD-601

is SIX decoder addresses and are therefore Multi Address Decoders.

CENTRAL SPECIFICATIONS – The Rain Bird Decoder System may contain multiple two-

wire paths – in fact it is STRONGLY RECOMMENDED that multiple two-wire paths be

designed into the system rather than just one large two-wire path. The MINIMUM number of

Two-Wire paths is dictated by the number of Single Address Decoders and Multi Address

Decoders that you have on your system and the type of wire system; i.e. STAR or LOOP

type

two-wire path. (Refer to TABLE 2.4 for further information.) The decoders must be

divided into separate two-wire paths according to the specification previously mentioned.

All of the decoders, on a decoder system, must have a unique four or five digit address code.

These address codes are used by the Central Control system to control each decoder individually.

For purposes of programming and daily operation of the system, each decoder is also given a

specific “programming” name by the operator or programmer, which usually identifies the type

area it is servicing and the location on the course. This is for ease of programming and daily

operation, rather than try to remember the specific decoder’s four or five digit address code.

The computer can then in turn send the specific four or five digit address code to the field for

actual operation of the decoder.

GT27141C Page 26 November 2003

Chapter

Installation of Decoders and

Wiring for the System

The Successful Installation of a Decoder System Requires Careful

Adherence to Proper Installation Procedure, Especially in Making

the wire splices.

It is of the utmost importance that a Decoder system be installed properly since the entire system,

once installed, will be underground and therefore not easy to access should any alterations or

repairs be required. A system installed correctly will function trouble-free for many years to

come. A system that is installed without heeding the installation guidelines will most likely

require undue maintenance and troubleshooting, possible “down-time” and could result in

expensive service and repair bills. In this chapter and succeeding chapters, important

requirements for the correct installation of a Decoder system will be presented. Proper wiring

methods, surge protection, and grounding requirements will be discussed. The most

important step in the installation of a decoder based irrigation system is the field and

decoder wiring. It is definitely to the installer’s advantage to take extra care during the

wiring phase of the project.

It is recommended that all sections of these guidelines be read thoroughly before focusing on the

sections that apply directly to the design being installed.

Terminology: “Primary Path” - Wiring from Line Termination Box to field decoders out to

the farthermost point from LTB.

Types of Primary Paths – “Star” and “Looped” configurations. (Looped is NOT

recommended due to difficulty in troubleshooting the system.)

“Critical Path” – Longest distance, measured along the wire path, from the LTB out to the

farthermost decoder away from the LTB.

GT27141D Page 27 November 2003

“Branches” or “Branch Loops” - Wires that “spur off” the Critical Path, to pick up

decoders.

“Secondary Path” - The wire that extends from the decoder output to the solenoid(s) of the

remote control valve or the valve-in-head sprinkler.

A Decoder system is relatively easy to install and set-up. Special attention must be paid to three

areas in order for the system to function up to its maximum capabilities, these areas are:

1. Installation of the two-wire communication path and most importantly the

wire connections (splices).

2. Proper installation of surge protection equipment and devices.

3. Proper installation and maintenance of the grounding systems.

If these areas are properly installed, the system can be ensured of proper operation as well as

limiting unnecessary damage to equipment due to voltage surges occurring on the system.

Failure to provide proper protection and proper installation, in these areas, can result in costly

service and repair bills for the golf course, as well as down time for the system, due to surge

damage.

This chapter is presented in an effort to stress the need for proper installation and proper surge

protection for the decoder system. The information is presented using two formats. One form

is a set of detailed installation drawings that summarizes exactly what surge protection, wiring,

and grounding is required and how it is to be installed.

The second is a written description of the installation procedures and surge devices required, as

well as, the necessary grounding of these devices and/or the equipment.

GETTING STARTED WITH THE INSTALLATION

FIELD WIRING - The first step is to become familiar with the wiring layout for the two-

wire paths. The wiring for the two-wire paths is recommended to generally follow the piping

of the system, as much as practical. It is also strongly

recommended that the two-wire path wiring be laid out in a “STAR” or “branched”

configuration, terminating in a number of dead ends. (Refer to FIGURE: 2.1) This is

primarily for the ease of potential troubleshooting in the future. It is important that a “LOOP”

configuration does NOT occur any where in the two-wire path unless the system has been

specifically designed as a “LOOP” type system. (Refer to FIGURE: 2.2)

GT27141C Page 28 November 2003

CONTINGENCY WIRING – It may be advisable to consider installing some “contingency”

MAXI Two-Wire cable, which can allow a given area of the system to be electrically controlled

from a different direction if a fault occurs on the primary communication path.

All two-wire cable designated as “CONTINGENCY” cable shall be installed with all ends

disconnected. Wire ends shall be placed in 3-M type DBY or DBR electrical connectors and

housed in a 10” Diameter round valve box, with cover and marked “ELECTRICAL”.

COLOR CODED CABLE – Each two-wire path shall have a differently colored outer jacket on

the MAXI cable. All branches from the main trunk line (Critical Path) of the two-wire path

shall also be of the SAME color outer jacket as that of the main trunk line of the two-wire path.

It is extremely important NOT to mix cable colors on any given two-wire path, just as it is

important that EACH two-wire path have its own different colored outer jacket on the cable and

no two-wire paths with the same color cable. Color coding of the two-wire path cable can be an

invaluable troubleshooting tool in the future.

Installation of Wire

WIRE INSTALLATION ON A NEW CONSTRUCTION – When wire is being installed at

the same time as new piping, it shall be laid on top of the 6” layer of clean back fill that covers

the pipe. In rocky conditions the trench shall have a 6” layer of clean sand on the bottom of the

trench before backfilling is started. If rocky back-fill is being used (which is NOT

recommended), the wire shall have a 6” layer of sand on top of it, before backfilling is started.

The wire shall have a

minimum of 18” cover on it

after backfilling is

completed.

It is necessary to maintain

consistency as to which side

of the trench the wire is laid.

By so doing you reduce the

risk of damaging the wire

should it be necessary to dig

in the area to repair a

pipeline leak or break. For

example; looking down a

golf hole from the tee to the

green, always lay the wire on the left side of the trench.

FIGURE: 3.1

Refer to FIGURE: 3.1

at the right.

GT27141D Page 29 November 2003

Where wire passes under roadways, cart paths, walls, or any other paved areas or where it may

be attached to the under side of bridges, etc., it shall be installed in a minimum of a 2” size PVC

Schedule 80 pipe conduit or a conduit that meets local codes.

WIRE INSTALLATION ON AN EXISTING SYSTEM – Where the two-wire cable is being

installed on an existing system, the cable may be laid using a vibratory plow with a wire sleeve

of sufficient size to prevent scoring of the outer jacket or putting friction on the outer jacket. It

must never be “pulled” in. When the wire is laid with a vibratory plow – extra care must be

taken to be sure the wire does NOT catch in the sleeve and cause the copper conductors in the

cable to be stretched, which produces a weak spot and very subject to future fracture of the

conductor. If the copper conductor is stretched too much an actual break may occur in the

conductor within the insulation jacket and remain undetected at the time of installation. This,

of course, can cause considerable time and labor to later “pin-point” the location of the

conductor fracture and correct it.

Making of Wire Splices

WIRE SPLICES – Wherever splices are made in the two-wire path or decoder wiring, they

shall be placed in a valve box. The only exception to this is for decoders at Valve-in-Head

sprinklers, where the decoders and wire splices may be direct buried, or unless other methods of

installation are desired, such as; placing them in a small round valve box, in a pipe sleeve with

cover, etc. This will be discussed further later in these guidelines. This means that ALL main

trunk line splices and ALL branch take-off connections MUST be placed in a valve box. Valve

box shall be a minimum of 10” in diameter with cover or a 12” x 18” rectangular type valve box

with cover. Sufficient slack shall be left at each connection and splice to allow wire and

connectors to be lifted a minimum of one foot (1’-0”) above the finished grade level for ease of

testing and troubleshooting of wire cable. Refer to FIGURE: 3.2 below.

Typical Wire

Splice in a

Rectangular

Valve Box

FIGURE: 3.2

GT27141C Page 30 November 2003

Marking of Wire Splices

WIRE SPLICE MARKING – All wires in a valve box shall be permanently identified as to

their routing direction or the holes they feed using a permanent

marking pen and marking on the cable outer insulation jacket or using some other suitable

permanent tag (metal, plastic, etc.) to identify the wire. Refer to FIGURE: 3.3 below.

Be absolutely certain this step is not overlooked, as it can save time and frustration,

should wire troubleshooting be necessary in the future.

FIGURE: 3.3

Stripping the Outer Jacket

STRIPPING THE OUTER JACKET OF THE MAXI TWO-WIRE CABLE - As noted

earlier, extreme care is necessary during the wiring phase of the project. The following is a

detailed description of the best method to strip the outer jacket of the two-wire cable that

minimizes the chances of cutting through the inner insulation and into the copper conductors

themselves.

Strip approximately 6” of the outer jacket of the cable for all the splices that are to be made.. It

can be difficult to attempt to remove all 6” of the outer insulation in one piece, so remove it in

two 3” sections.

GT27141D Page 31 November 2003

The acceptable knife that allowed for this procedure is the small snap-off blade variety. Refer to

FIGURE: 3.4 below. It is recommended that you grind off the point of the knife blade to

minimize the chances of piercing the inner insulation. The King Safety stripper may also be

used but care must be taken to cut away from the conductors when removing the remaining outer

jacket so as not to damage the inner conductor insulation.

FIGURE: 3.4

The blade of the knife should be set and locked at its minimum extension to prevent a cut in the

inner insulation. This is the most crucial aspect of the entire wiring procedure. DO NOT use

hook knives, pocket knives, utility knives, or ROMEX strippers since you have no way to limit

the depth of your cut and therefore all have the possibility of cutting through the inner insulation

if you attempt to use them.

Hold the MAXI two-wire cable in one hand and while holding the blade against the outer jacket

with the other hand, score the outside of the jacket. Refer to FIGURE: 3.5 below.

FIGURE: 3.5

GT27141C Page 32 November 2003

Now Gently flex the cable to crack the outer jacket. Refer to FIGURE: 3.6 below. DO NOT

bend it back and forth more than is absolutely necessary since it is possible to break the inner

conductor within the inner insulation and not be aware that it happened. Once the outer jacket is

cracked, simply pull the outer insulation jacket off, leaving the two inner PVC insulated

conductors, one RED and the one BLACK, exposed.

FIGURE: 3.6

After about 6” of the RED and BLACK insulated conductors are exposed, use a wire strippers of

proper gauge to remove approximately 5/8” of the PVC inner insulation from these conductors.

A wire stripper similar to that pictured in FIGURE: 3.7 below has been found to work best,

since they can also strip the insulation from other conductors encountered during the installation.

FIGURE: 3.7

GT27141D Page 33 November 2003

Making the Wire Splice

MAKING WIRE SPLICE – When making an inline wire splice use a linesman’s pliers to

gently twist one of the red insulated conductors to the other red insulated conductor and one of

the black insulated conductors to the other black insulated conductor. Place no more than three

or four twists in the wire. Twisting the wires in excess can fracture the conductors. Refer to

FIGURE: 3.8 below.

FIGURE: 3.8

Other splicing techniques will be covered later in this manual for guidelines in regard to decoder

wiring. The following points hold true in every splice that will be made, however, and are

VERY important.

• Do NOT lay the two wires together to be held by the wire nut and do NOT over

tighten the twists as it is possible to stretch the wire and weaken it, which can then

break when wire-nutted and the break may not be apparent to you.

• When the wires are twisted together, firmly hand tighten the appropriate size wire

nut onto the twisted wire and push it into the DBY or DBR connector as far as

possible and secure the cap.

• If making a three-way splice, mark the wires permanently with the hole numbers or

areas of the golf course the wire comes from and where each is going.

• This and all other splices should be placed in a valve box with the mandatory one foot

(1’-0”) above grade minimum amount of slack.

GT27141C Page 34 November 2003

GENERAL INSTRUCTIONS:

DECODER WIRING PROCEDURES:

The following instructions shall apply to ALL the different wiring configurations presented here

in this section of the manual.

WIRING OF DECODER INPUT & OUTPUT WIRES – Each remote control valve will be

wired to a decoder and the decoder in turn wired into the Two-Wire communication path. The

two (2) blue wires of the decoder connect into the Two-Wire communication path, one to the

RED insulated wire of the Two-Wire cable and the other to the BLACK insulated wire of the

cable. It does not matter which of the blue wires, of the decoder, connect to the red and which

to the black wire of the two-wire cable. The two output decoder wires are white and each

connect to one of the two wires from the solenoid coil. Again it does not matter which of the

wires from the decoder connect to which wires of the solenoid coil. The procedures for proper

splicing of an inline splice apply. It may be necessary to strip a small additional amount of the

insulation from the blue and white wires of the decoder as well as from the wires of the solenoid

coil to provide enough bare copper conductor to work with in making the splice.

After you have made the “twist” connection of the RED to RED insulated wires and the

BLACK to BLACK insulated wires of the two ends of the Two-Wire communication cable,

you are ready to connect the blue wires from the decoder. Lay the bare copper conductor, from

one of the blue decoder wires, into the twisted wire “groove” between the two copper

conductors from the RED insulated wire splice and follow the twist using either your fingers or

linesman’s pliers. Repeat for the other blue wire from the decoder, laying the conductor into

the twisted wire “groove” between the two copper conductors from the BLACK insulated wire

splice and follow the twist using either your fingers or linesman’s pliers. Place a wire nut on

each of these splices and then insert each splice into a 3-M DBR connector, making sure you

insert it into the connector as far a possible, and then snap the cap securely in place. Refer to

FIGURE: 3.9 below.

GT27141D Page 35 November 2003

FIGURE: 3.9

CONNECTING THE DECODER OUTPUT –The decoder white output wires are to be

connected to the wires on the solenoid coil of the Valve-in-Head sprinklers or the remote control

valve. It may be necessary to strip a small amount of additional insulation off the solenoid

wires, as well as, from the decoder white output wires to provide enough bare copper conductor

to work with in making the splices. Take one of the white decoder output wires and hold it

parallel to one of the solenoid coil wires and using your fingers or a linesman’s pliers, twist the

two wires together. Use a CLOCKWISE direction in making the twist so that in applying the

wire nut it will not cause the wires to “un-twist”. Repeat this procedure for the other decoder

white output wire and the remaining solenoid coil wire. Place a wire nut on each of these

splices and then insert each splice into a 3-M DBY connector, making sure you insert it into the

connector as far as possible, and then snap the cap securely in place. Refer to FIGURE: 3.10

below.

FIGURE: 3.10

GT27141C Page 36 November 2003

SPLICING TECHNIQUES – The following points hold true in every splice that you will

be making and all are very important.

• Do NOT lay the two wires together and depend on a twist being made by the wire nut

• Do NOT over tighten the twists as it is possible to stretch the wire and weaken it,

which can then break when the wire nut is applied and the break may not be apparent

to you.

• When the wires are twisted together, firmly hand tighten the appropriate size wire

nut onto the twisted wire and push it into the DBY or DBR connector as far as

possible and secure the cap.

• If making a three-way splice, mark the wires permanently with the hole numbers or

areas of the golf course the wire comes from and where each is going.

RECORDING OF DECODER ADDRESS CODE – At this point, record the four or five

digit decoder address code, on either a “Start-Up Work Sheet” and/or on a drawing of the

irrigation system layout for the course, making sure you identify the proper location in the field

for this decoder. This data will need to be on the “Start-Up Work Sheet” along with all the other

necessary information to do the initial data entry into the computer. The decoders can be

installed in any random address code order and do not need to be installed sequentially. The

important thing is to accurately record the address code at the proper decoder.

This section covers the different wiring configurations commonly

encountered in a decoder system. Any given installation may

incorporate several of these concepts.

GT27141D Page 37 November 2003

CONFIGURATION #1:

Field Decoder and Remote Control (Block) Valve

The block remote control valve configuration is used most commonly when the main line is in

the rough and laterals are pulled out to the areas of the golf hole. A single address decoder,

such as the FD-102 is most commonly used in conjunction with the remote control valve

although any of the other model decoders might also be used. Refer to FIGURE: 3.11 below.

FIGURE: 3.11

Electric Valve with

FD-102 Decoder

Not to Scale

GT27141C Page 38 November 2003

CONFIGURATION #2:

DECODER and VALVE-IN-HEAD

SPRINKLER INSTALLATION METHODS

SINGLE ROW FAIRWAY SYSTEM - This is perhaps one of the most common type

systems. In this type system it is common to have one decoder for each fairway Valve-in-Head

sprinkler. Therefore, the Rain Bird Model FD-102 type decoder, which is a single address

decoder, is most generally used. For the Greens, Tees, Approaches, Perimeters and Roughs

many times another type decoder will be utilized depending upon the design.

FD-102 DECODER CONTROLLING SPRINKLER

A TYPICAL INSTALLATION – A typical installation detail is shown in

FIGURE: 3.12 below, for a single FD-102 decoder controlling a single Valve-in-Head

sprinkler. An FD-102 decoder is required for each Valve-in-Head sprinkler, that is to operate

individually and that is installed in a single row, down the center of each fairway or other

locations of the course, where individual operation of the Valve-in-Head sprinkler is desired.

FIGURE: 3.12

FD-102 DECODER CONTROLLING A

SINGLE VALVE-IN-HEAD SPRINKLER

GT27141D Page 39 November 2003

NOTE ! Refer to “Decoder Wiring Procedures” - General

Instructions – shown on Page 39.

FIRST – Strip the outer jacket from each end of the two-wire communication cable, where you

are going to install the decoder for the Valve-in-Head sprinkler. Refer to previous area

“Stripping the Outer Jacket”. Then from each end of the conductors in the communication

cable, strip approximately 5/8” of the PVC inner insulation from the conductors. Refer to

FIGURE: 3.7 shown previously, for proper type of wire stripper to use.

MAKING THE WIRE SPLICE – When making an inline wire splice use a linesman’s pliers

to gently twist one of the red insulated conductors to the other red insulated conductor and one of

the black insulate conductors to the other black insulated conductor. Place no more than three or

four twists in the wire. Twisting the wires in excess can fracture the conductors. Refer to

FIGURE: 3.8 shown previously.

LOCATION OF DECODER - The wiring procedure is the same as it is for a remote control or

“block” valve with the exception that the decoder and splices will be directly buried beside the

Valve-in-Head sprinkler instead of in a valve box. It is important that the LOCATION OF

THE DECODER AND SPLICES REMAIN CONSISTENT through out the entire course. It

is recommended that the assembly be buried directly below the manual valve actuator 6” below

grade. DO NOT TAPE the decoder and splice assembly to the Valve-in-Head sprinkler, as

this would prevent removal of the sprinkler head from the riser without first digging down and

un-taping the assembly. Otherwise, the solenoid coil can just be slipped off the core tube and

the sprinkler then can be un-screwed from the riser. As with all splices, leave enough slack so

as to be able to lift the assembly at least 1’-0” above the finish grade. Orient the DBR’s and

DBY’s above the decoder and all the wires. In this way they will serve to protect the wires from

being nicked, by alerting you that you’re close to the wires if any digging is required in this area

in the future.

GT27141C Page 40 November 2003

CONFIGURATION #3:

ONE DECODER FD-102 CONTROLLING TWO

VALVE-IN-HEAD SPRINKLERS

TWO SPRINKLERS OPERATING FROM ONE DECODER – Another method of control

on a single row fairway system is to operate and control two (2) sprinklers together form one

single decoder. This is illustrated below. Refer to FIGURE: 3.13below.

FIGURE: 3.13

A SINGLE FD-102 DECODER OPERATING

TWO VALVE-IN-HEAD SPRINKLERS

GT27141D Page 41 November 2003

LOCATION OF DECODER – Where two (2) Valve-in-Head sprinklers are to be operated

from a single FD-102 decoder, locate the decoder at the first Valve-in-Head in line. The wiring

procedure is similar to that for a remote control or “block” valve with the exception that the

decoder and splices will be directly buried beside the first Valve-in-Head sprinkler, instead of in

a valve box In addition there is a second Valve-in-Head sprinkler also being controlled by this

same decoder. It is important that the LOCATION OF THE DECODER AND SPLICES

REMAIN CONSISTENT through out the entire course. It is recommended that the assembly

be buried directly below the manual valve actuator 6” below grade. DO NOT TAPE the

decoder and splice assembly to the Valve-in-Head sprinkler, as this would prevent removal of

the sprinkler head from the riser without first digging down and un-taping the assembly.

Otherwise, the solenoid coil can just be slipped off the core tube and the sprinkler then can be

un-screwed from the riser. As with all splices, leave enough slack so as to be able to lift the

assembly at least 1’-0” above the finish grade. Orient the DBR’s and DBY’s above the decoder

and all the wires. In this way they will serve to protect the wires from being nicked, by alerting

you that you’re close to the wires if any digging is required in this area in the future.