TeeJet 844 User Manual

Installation,
Programming
and Operating
Manual

Spraying Systems Co.

®

Cable Connections

BATTERY

BATTERY

CABLE

BATTERY

CABLE

LEAD

844 SPRAYER CONTROL

FLOW METER

(OPTION 1)

PRESSURE TRANDUCER

(OPTION 2)

SPEED

SENSOR

SENSOR END

CABLE

SENSOR

CABLE

LEAD

PRESSURE

REGULATING

VALVE

VALVE END

CABLE

VALVE

CABLE LEAD

BOOM

CONTROL

VALVES

Introduction 2

Sprayer Control Installation 4

Mounting Sprayer Components 4

Pressure Regulator in Bypass Mode 4
Pressure Regulator in Throttling Mode 5
Flow meter 6
Boom Control Valves 6

Pressure Transducer 6
Installing the Speed Sensor Assembly 7-9
Mounting the TeeJet 844 Console 10-12
Connecting System Components to the Control Console 13
Component Wiring 14-15

Programming Guidelines 16
Steps to Successful Programming 17
System Setup Mode 17

Programming Steps

1 Setting the Program Mode - U.S./Turf/NH3/Imperial/S.I. 17
2 Flow meter or Pressure Based 17
3 Flow meter Pulses 18
4 Pressure Transducer Maximum Rating (P Hi) 18
5 Pressure Transducer Low Pressure Calibration (P rEF) 19
6 Nozzle Spacing 19
7 Number of Spray Tips Per Boom Section 20
8 User Programmable Tip 20
9 Pressure Regulating Mode 21
10 Regulation Adjustment Speed 22
11 Boom Control Valve Type 22
12 Recording Speed Sensor Magnetic Pulses 23-24

Radar Speed Sensor Pulses

13 Distance Counter 24
14 Simulated Ground Speed 24
15 Liquid Specific Gravity 25
16 Communications 25
17 Minimum Regulating Pressure Setting 26

Application Setup Mode 27

Programming Steps

1 Target Application Rate 27
2 Nozzle Selection 27-28
3 Calculation Step 28-29

Operating Instructions

Sprayer Checkout 30
The Spraying Operation 31

Features

Boost Mode 32
Area/Volume Feature 32
Flow Rate Feature 33
Application Alarm 33
No Flow Alarm 33
Printing 34

Troubleshooting Guide 35-37
Flow meter Calibration 38-39
Terms and Conditions of Sale 40

1

Table of Contents

TeeJet is a registered trademark of
Spraying Systems Co.

Congratulations! And thank you for choosing Spraying Systems’advanced
844 sprayer control system.With its proper installation and maintenance, you
can enjoy many seasons of accurate and uniform spray application with
fingertip convenience and ease of operation.

Installation and Programming of your control system will be covered in easy­to-follow, step-by-step instructions.

2

Introduction

WE RECOMMEND THAT YOU READ THESE INSTRUCTIONS
COMPLETELY before attempting installation and programming
of your 844 sprayer control.The unit’s performance will
depend on its proper installation and programming, along
with planned preventive maintenance of your entire sprayer.

The TeeJet®844 Sprayer
Control package for
pressure based systems
could consist of the
components shown in
this photograph.

They include:
(1) Computerized Control

Console

(2) Pressure Regulating

Valve

(3) Connecting cables,

plugs, and cable ties
(4) Pressure Transducer
(5) Speed Sensor Kit –

Magnetic type
(6) TeeJet Agricultural

Spray Products

Catalog (not shown)
(7) 844 Mini Manual

(not shown)

PRESSURE

TRANSDUCER

COMPUTERIZED

CONTROL CONSOLE

PRESSURE

REGULATING

VALVE

SPEED SENSOR KIT

CONNECTING

CABLES,
PLUGS AND
CABLE TIES

3

The TeeJet®844 Sprayer
Control basic package for
flow based systems
could consist of the
components shown in this
photograph.

They include:
(1) Computerized Control

Console

(2) Pressure Regulating

Valve

(3) Connecting cables,

plugs, and cable ties
(4) Flow meter
(5) Speed Sensor Kit –

Magnetic type
(6) TeeJet Agricultural

Spray Products

Catalog (not shown)
(7) 844 Mini Manual

(not shown)

NOTE:The 844 Sprayer Control is fully capable of operating and
controlling NH

3

applications. However, hardware components such as flow
meters, regulating valves, and cooling towers will vary from the Standard
Kit. A complete TeeJet NH

3

Hardware Kit is available through your TeeJet

dealer.The 844 is also compatible with other NH

3

systems currently on

the market. Contact your TeeJet dealer for more information.

FLOW METER

COMPUTERIZED

CONTROL CONSOLE

PRESSURE

REGULATING

VALVE

SPEED SENSOR KIT

CONNECTING

CABLES,
PLUGS AND
CABLE TIES

4

PRESSURE REGULATOR IN BYPASS MODE

All pressure regulating valves for the 844 will be wired for use in a by-pass
system.While plumbed in a by-pass mode, with the

Auto/Man key in the “MAN”

mode, the valve should close when the key is depressed and open when the

key is depressed.

The pressure regulating valve can also be mounted in a throttling situation as an
alternative location. Refer to page 5, and Figures 8 and 8A.

NOTE:The diagrams in Figures 7, 7A, 8 and 8A are shown as general
guidelines to follow when plumbing 844 components.The type of pump
used and location of other components can vary from sprayer to sprayer.
It is important to ensure that if a pressure transducer is used that it is
located as close to the spray tips as possible. Normally this is at the boom
control valves. However, if one particular boom section is always used, the
pressure transducer can be mounted on that particular boom section. If a
flow meter is used, ensure that all of the flow going through the flow meter
is directed to the spray tips. Make sure that proper distance is allowed on
the inlet and outlet side of the flow meter (refer to figures 7A and 8).

Mounting Sprayer Components

FIGURE 7

B

YPASS PLUMBING DIAGRAM

PRESSURE BASED SYSTEM

TANK

JET AGITATOR

DIAPHRAGM

PUMP

TANK SHUT-OFF

STRAINER

PRESSURE

REGULATING

VALVE

AGITATOR

VALVE

PRESSURE RELIEF VALVE

PRESSURE

TRANSDUCER

ELECTRIC

BALL VALVES

BOOM SECTIONS

TANK

JET AGITATOR

DIAPHRAGM

PUMP

TANK SHUT-OFF

STRAINER

PRESSURE

REGULATING

VALVE

AGITATOR

VALVE

PRESSURE RELIEF VALVE

FLOW METER

5-7”

(12-17 CM)

10-12”

(25-35 CM)

ELECTRIC

BALL VALVES

BOOM SECTIONS

FIGURE 7A

B

YPASS PLUMBING DIAGRAM

FLOW BASED SYSTEM

5

PRESSURE REGULATOR IN
THROTTLING MODE

In large flow situations, the pressure regulating valve, as shown in Figures 8 and
8A, can be located in the supply line before the boom control valves. If you
choose this location, the 844 will need to be properly programmed to reverse the
polarity of the valve.This step can be found in the System Setup instructions on
page 21.When in throttling mode, the valve should open when the key is
depressed, and close when the key is depressed.Be sure to check this
before plumbing the valve into the system.

FLOW METER

FIGURE 8

T

HROTTLING PLUMBING DIAGRAM

FLOW BASED SYSTEM

TANK

JET AGITATOR

CENTRIFUGAL

PUMP

TANK SHUT-OFF

STRAINER

BOOM SECTIONS

SOLENOID VALVES

THROTTLING

VALVE

PRESSURE

REGULATING

VALVE

AGITATOR

VALVE

5-7”

(12-17 CM)

10-12”

(25-35 CM)

FIGURE 8A

T

HROTTLING PLUMBING DIAGRAM

PRESSURE BASED SYSTEM

SOLENOID VALVES

TANK

JET AGITATOR

CENTRIFUGAL

PUMP

TANK SHUT-OFF

STRAINER

BOOM SECTIONS

THROTTLING

VALVE

PRESSURE

TRANSDUCER

PRESSURE

REGULATING

VALVE

AGITATOR

VALVE

FLOW METER

To ensure accurate readings, the flow meter (if used) must be mounted 10˝ to 12˝
(25-35 cm) from other pipe fittings, preferably in a vertical position with the flow
going up.It should also be mounted with direction of flow arrow pointing toward
the boom control valves. Refer to Figures 7A and 8.

Be sure the flow meter is plumbed so that all liquid passing through it is routed to
the booms and not back to the tank.When using three-way boom control valves,
refer to page 22 of this manual for programming guidelines.

BOOM CONTROL VALVES

The Boom Control Valves are connected in tandem and centered in front of the
boom sections. See the Control Valve Instruction Manual for mounting
instructions. If using three-way valves, refer to the instruction manual of the
valves you are using for valve calibration instructions.

PRESSURE TRANSDUCER

The pressure transducer (if used) should be installed as close to the spray tips
as possible.Nor mally this is at the boom control valve assembly. Refer to pages
4 and 5, Figures 7 and 8A. Mount the unit vertically on a shor t stand pipe to
help protect the sensor.

NOTE: Pressure drop, to some degree, is found in most plumbing systems.
Pressure drop is created when there is any kind of restriction in the spray
line reducing flow rate and is quite often produced between the boom
control valve assembly and the spray tips. If one of the boom sections on
the sprayer is always used, the pressure transducer can be installed on
that particular boom section, therefore minimizing any potential pressure
drops between the sensor and spray tips. If the pressure drop in your
system is greater than 5 psi (0.3 bar), you should consider this as an
alternative location for the pressure transducer.

Check all components to make sure they are mounted securely to avoid
excessive vibration.

6

Components: Two magnets, Sensor with attached connector cable, and
mounting hardware.

If you are installing a radar ground speed sensor, follow the instructions supplied
with that unit.

Location

The speed sensor assembly should
be installed on a non-driven wheel to
avoid potential errors that are likely to
occur from a slipping drive wheel.
Refer to Figure 1.

Proximity Sensor (optional)

An optional proximity sensor is
available to use in cases where space
is limited or for drive shaft mounting.
The proximity sensor will work by
sensing any metal object.The
proximity sensor must be mounted so
that the sensor face is within 1/8 to 3/8
inch (3-10 mm) of the metal object
being read.

7

Installing the Speed Sensor Assembly

1

SPEED

STEP

FIGURE 1

W

HEEL MOUNTING

OF

MAGNETIC

SPEED SENSOR

CABLE

MAGNET

RIM

SENSOR

TIRE

FIGURE 2

NOTE:
TARGET FACES
TIRE LUGS

Installing the Wheel Magnets

Check for pre-drilled holes in the wheel rim.If pre-drilled holes are not available,
layout a pattern as shown in Figure 4 and drill two 3/8 inch (10 mm) holes,
locating them near the outer edge of the rim, if possible and 180° from each other.

Place the magnets into each of the two holes on the inside rim and securely
fasten using the nuts and washers provided.

Installing the Magnetic Sensor

The flat, pressed L bracket of the wheel speed sensor kit should be secured to a
vertical member near the non-driven wheel.The round, right angle steel bracket
is then secured to the flat bracket with the two U-bolts and necessary hardware
provided.The round, right angle bracket is then used to secure the magnetic
sensor mounting clamp.

The magnetic sensor should be inserted into the mounting clamp and positioned
to within 1/8 to 3/8 inch (3-10 mm) of the wheel magnet.Tighten the sensor
clamp using the clamp screw per Figure 6A.

Your installation will likely vary from the example. It may be necessary to
customize the installation to accommodate your specific machine. Keep in
mind that the two magnets must be spaced an equal distance around the
wheel.The magnetic sensor must be mounted in-line
with the magnets and positioned within 1/8 inch to
3/8 inch (3-10 mm) from each magnet as they
pass the Sensor assembly.

8

2

SPEED

STEP

3

SPEED

STEP

FIGURE 4 FIGURE 5

M

AGNET LOCATIONS MAGNET ASSEMBLY

TIRE

WHEEL

NUT

NUT

MAGNET

WASHER

3/8˝ (10 mm)

HOLE FOR

MAGNET

FIGURE 6A

S

ENSOR ASSEMBLY

CLAMP

SCREW

SENSOR

BRACKET

FIGURE 6

S

ENSOR MOUNTING

SENSOR

FLAT

L BRACKET

Confirming Speed Sensor Installation

Magnetic Wheel Sensor:

After your wheel or proximity sensor is installed and once the 844 console is
installed and powered up, you can test the speed sensor installation. Connect the
wheel speed or proximity sensor to the sensor cable, and in turn connect the
sensor cable to the 844 console.When the connection is made, rotate the wheel
on which the magnets are installed. If using a proximity sensor, you will be
sensing metal objects and not magnets. Each time a magnet (metal object for
proximity sensor) passes the sensor a red LED (orange LED for proximity
sensor) on the back of the sensor will light.The LCD display on the console will
also indicate a speed as the sensor receives and sends electronic pulses.

Radar:

If you are using a radar speed sensor it should be connected to the speed
sensor connector on the sensor end cable.An adapter cable will be necessary
when using most radars and are available through your TeeJet 844 dealer.The
844 will automatically sense if the speed sensor is a wheel speed or proximity
type or radar type sensor during calibration.The 844 is automatically adapted to
most brands of radar speed sensors, provided that the appropriate adapter cable
is used. If using a radar sensor, the 844 will display

rAd during the calibration

procedure.

9

4

SPEED

STEP

MOUNTING THE TEEJET 844 CONSOLE

Location

Determine the best location for the control console in the cab or operator’s
compartment. Allow sufficient clearance, approximately 4-5˝ (10-12 cm) to
accommodate for the power and operating cables that will be connected to the
cable leads and connectors on the right side of the console.

Mounting

Mount the console to a firm suppor t within the cab area, and secure using the
slots provided on the top, back, or bottom of the Console. Although two simple
brackets are supplied with the unit, some additional bracketing may be
necessary.The slots in the 844 will accept 1/4˝ (6 mm) bolts.

10

1

CONSOLE

STEP

2

CONSOLE

STEP

BRACKETS PROVIDE
ANGLE ADJUSTMENT

Power Connection

Locate the power cable which has a black connector on one end, and two battery
terminal rings on the other. Extend the battery terminal r ing end of this cable from
the cab to the battery.

Note: Some tractors use two 6 Volt batteries as a power source. Make sure
there is a total of 12 Volts delivered to the controller by connecting to the
(+) terminal on one battery and the (-) terminal on the other battery.

Reliable operation of the 844 Sprayer Control depends on a clean power
supply. Ensure this by connecting the power cables directly to the battery
and not to another power source.

Connect the battery terminal r ings to the battery posts, making sure that the
positive

(red) and negative (black) wires correspond with the polarity of the

battery terminals.
Note: The power cable is designed to provide the simple addition of a remote

master boom switch in a convenient location (i.e. on the throttle, gear shift, or
floor switch).To install a remote boom switch, simply install a switch in the loop of
brown wire in the power cable.The switch should be rated to handle the total
current used by all boom section valves combined. If installed, the remote master
switch will operate in series with the boom switches on the console.

Connect the battery cable to the console by joining its connector with the
connector on the short power cable lead that extends from the middle of the right
side of the console.

Test the installation by depressing the key once to turn the 844 console on. If
the display shows information, you have wired the power correctly.

Note:The TeeJet 844 Sprayer Control has an automatic power down
feature.With the master boom switch in the “off” position, the 844 will
automatically shut down after 10 minutes of no inputs.This prevents
possible battery drainage.To turn the console “off” with the Master Switch
located in the “off” position, depress and hold the key while
depressing the key once, and then releasing both keys.The console
display will read “OFF”and will shut down after 5 seconds providing no
other keys are depressed.

11

3

CONSOLE

STEP

BATTERY

ONE 12-VOLT BATTERY

RED (POS.)

BLACK (NEG.)

CONSOLE
BATTERY
WIRES

12-VOLT SYSTEM USING
TWO 6-VOLT BATTERIES

RED (POS.)

BLACK (NEG.)

CONSOLE
BATTERY
WIRES

RED (POS.)

BLACK (NEG.)

CONSOLE
BATTERY
WIRES

24-VOLT SYSTEM USING

TWO 12-VOLT BATTERIES

RED (POS.)

BLACK (NEG.)

CONSOLE
BATTERY
WIRES

12-VOLT SYSTEM USING
TWO 6-VOLT BATTERIES

Connecting Component Cables to Console

Now that you have the console installed you can begin connecting it to the other
components of the 844 system.The standard kit contains a valve end cable that
attaches to the boom control valves and the pressure regulating valve on one
end, and directly to the lower right cable lead of the 844 on the other end.The
valve end cable can be identified as the one with a single connection plug on
one end and either 5 or 7 single wires and one small two wire connector on the
valve end.

A second cable connects the flow meter and/or pressure sensor, and a magnetic
wheel speed sensor, proximity speed sensor or radar speed sensor to the 844
console. It attaches to the sensor cable connector located on the top of the right
side of the controller.The correct cables will be supplied with the 844 kit you
ordered or purchased.

Lay out the cables before installing the sprayer components to be sure the cables
are long enough. Each of these cables is 15 feet (4.5 meters) in length from the
sensor connections to the 844 console connection. If your installation requires
longer cables, an 8 or 15 foot (2.5 or 4.5 meter) extension that installs between
the console and the standard end cable is available.

If an exit hole had to be cut in the cab, be sure the edges are deburred and
protected to prevent damage to the cables.

12

4

CONSOLE

STEP

SENSOR CABLE
LEAD

POWER CABLE
LEAD

VALVE CABLE
LEAD