HERON HT240 pro Instruction Manual

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H E R O N E L E C T R I C C O M P A N Y L T D
User Guide and Installation Manual
HT240 pro - Two Wire Decoder Controller
Ti240-Basic
31/10/22
S:\Critical\Products\TwoWire\Manuals\Ti-Manuals\

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Table of Contents
About the Controller 5
Installation 5
Mounting the Controller 5
Connecting Mains Supply 5
Installing Decoders 5
Pump / Master Valve Outputs 7
Cable Earth Points 7
More Inputs and Outputs 8
Start Input 8
Suspend Input 8
Flow Meter Input 8
Climatic Sensor Input 8
24VAC Permanent Output 8
Getting to know Your Controller 9
Resetting the Clock and Date 9
Set Up and Edit an Automatic Starts 10
Set Up and Edit Program Names 11
Set Up or Edit Program Information 12
Set Up and Edit Zone Information 14
a. Zone Configuration 14
b. Change Zone Name 14
c. View Zone Names 15
Pump Configuration 15
a. Pump Prime Time 15
b. Assign Pumps to Zones 16
Starting and Stopping 16
a. Program Start 16
b. Zone Start 17
c. Pump Start 17
d. Manual Stop 17
Short Cuts 18
a. Set All 18
b. Manual Advance 18
Log 19
Electrical Conformity 20

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Changing Controller Options 20
a. Standard Configuration Options 21
1. Number of Zones 24
2. Number 24hr Starts 24
3. Number Weekly Starts 24
4. Skip Day Starts 25
6. Number of Programs 25
7. Rain Gauge 26
8. Manual Percentage 27
9. Input 1 Use 27
11. Auto Enable Option 27
13. Zone Info. 28
14. Config Program 28
15. Program Percentage 28
16. Use Names 29
17. Number of Cycling Starts 29
20. Parallel Programs 29
21. Parallel Manual Starts 30
28. Number of Flow Meters 30
29. Flow Test Enabled 31
30. Advance Lo Flow 31
31. Advance Hi Flow 31
32. Max Flow Faults 31
35. Week Auto Extra 32
40. Remote Start Prog 32
41. Remote Start Type 32
47. Group Percent 32
48. Back Up Prog 33
51. Display Current 33
52. Extra Info 33
58. Flow Log Rate x10S 33
b. Program Options 33
c. Reprogram General 34
d. Reprogram Programs 35

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About the Controller
The HT240-Pro controllers are sequential irrigation controllers that operate 24V AC solenoid zones via
"decoders". Decoders are connected to the controller via a common two-wire cable.
Installation
WARNING Installation should be carried out by a qualified Electrician.
Mounting the Controller
The controller should be mounted on a wall using four screws, one screw through each corner lid bolt hole.
Warning: Additional holes should not be drilled through the controller casing.
Do not mount the controller in direct sunlight. Do not mount the controller where it can be exposed
temperatures above 40 degree C.
Mount the terminal box at the bottom of the controller and plug in the 5 Way lead the ribbon cable and the
Green Surge earth cable as shown below.
Connecting Mains Supply
IMPORTANT. Switch off the mains supply before connecting the controller.
Check that the mains supply voltage IS the SAME AS the VOLTAGE OF the CONTROLLER. The controller
voltage is displayed on the inside the controller casing. The mains supply should be fused with a 3 amp fuse
and be connected via a Residual Current Circuit Breaker as per any equipment used in damp conditions.
Connect the mains supply to the three terminals, Live to L, Neutral to N and Earth to E as shown in fig. 1
below.
Installing Decoders
Never expose decoders to direct sunlight or in locations where they be exposed to ambient temperatures of
more than 40 degree C. In warmer climates this will necessitate installing in zone box underground.
The solenoid output voltage is an Extra Low Safety Voltage. Keep solenoid cables and connections well
away mains voltages as per regulations for Extra Low Safety Voltages.
It is recommended that a two wire waterproof cable e.g. polythene cable or similar, is used to connect the
decoders. All cable joints must be sealed to minimise water ingress.

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Pump / Master Valve Outputs
The controller has two Pump or Master Valves outputs on P1 and P2. Both outputs are current limited and
are designed to operate small 24V DC relays having a coil resistance of > 1K Ohms.
The outputs can also be used as Master Valve outputs. As the outputs P 1nd P2 are current limited you should
operate the solenoid valve using a relay as shown in fig.1.
Cable Earth Points
Cable earth points should be wired to the cable with earth rods as also shown in Fig 2. A minimum of 3 should
be installed for a looped cable and a minimum of 2 for a straight cable. Additional cable earth points should
be wired every 750m if necessary. Failure to wire these earth points will make the controller liable to surges
caused by lightning which may causes serious damage.

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More Inputs and Outputs
Start Input
The Start Input is across "I2" and "C2". Joining these terminals will start program 1. The terminals have to be
connected for only a short period, 1 second, to activate the program. The contact must be broken before the
program will start again.
Suspend Input
The Suspend Input is across "I1" and "C2". Joining these inputs halts the irrigation programs. The programs
will continue once the short is removed.
This input may be connected to a float switch in the water reservoir so that the irrigation sequence is halted if
the water level is low.
The Suspend Input can be configured to be a stop rather than suspend input.
Flow Meter Input
A pulse type flow meter or paddle wheel flow meter can be connected to the flow meter input. A pulse type
flow meter connects across the F and G terminals.
Paddle Wheel flow meters are connected to F and G and are powered from the +V terminal. The +V terminal
provides +18VDC.
Climatic Sensor Input
The Climatic Sensor Input allows Heron sensors and the Heron weather station to be connected to the
HT240pro controller. Please see specific sensor manual for wiring instructions.
The Climatic Sensor Input also allows a simple rain switch (mini-click) to be connected to the HT240pro
controller. The simple rain switch is connected across the D and G terminals.
24VAC Permanent Output
A 24VAC permanent output is available across the terminals marked 24VAC. This output is to supply low
power 24VAC devices such as Heron interface cards and the Heron GSM module. This output is fused with
a F2 a 0.3A fuse.

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Getting to know Your Controller
When you switch on the power the Main Menu will be displayed, as shown below.
Additional menu items may be displayed depending on how the configuration options on your controller have
been set. To scroll through Menu items press the “Arrow Up” and “Arrow Down” keys.
To select any menu item press the “OK/SELECT” key.
Repeatedly pressing MENU key will return you to the Main Menu.
If you press the MENU key on the Menu Screen, the Time Screen will be displayed, as shown below. The
Time Screen shows the zones that are currently running.
Resetting the Clock and Date
Use the “Arrow Down” key to scroll to the “CLOCK” item on the Main Menu. Select “CLOCK” from the Main
Menu.
The following screen will be displayed.
MAIN MENU
AUTO START
EDIT PROGRAM
ZONE INFO
PUMP CONFIG
LOG
13:05:41
TUE
ZONES OFF
--------------------------------------------------------------------
-------
SET CLOCK
TIME 13:08:50
DATE 5/04/22
COUNT 02 TUE
14 COUNT 02

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Use the “Left” and “Right Arrow” keys to move the cursor over the time fields to change the time.
Press “Arrow Down” to move cursor over the date fields to change the date.
The day of the week will automatically change to the correct day for the date entered.
The ““Day Count”” reflects the day of the week that corresponds to the date entered. For example, if the date
entered is a Monday, then the ““Day Count”” will automatically change to 01. If the date entered is a Friday,
then the ““Day Count”” will change to 05.
The 14 “Day Count” reflects the day of the week over a two week period. When a date is entered or changed
then the 14 “Day Count” is reset to week 1 of the two week period. For example if the date entered is a
Wednesday, then the 14 “Day Count” will be automatically change to 03.
Press the MENU key to return to the Main Menu.
Set Up and Edit an Automatic Starts
Select “AUTO START” from the Main Menu.
The following screen will be displayed.
Initially your controller will be set to have a maximum of 6 automatic program starts per 24 hours. Your
controller can have up to 60 automatic starts. The number of automatic starts can be changed by setting the
controller’s Options. See section 15 “Changing Basic Configuration Options”.
The time is displayed in hours and minutes. A start time should be entered using 24 hour clock times.
Use the arrow keys to move the cursor over the program number. Use the number keys to enter the number
of the program to be started.
Use the arrow keys to move the cursor over the hours and minutes fields. Use the number keys to enter the
start time of the program.
An automatic start must be activated in order for it to work. Move the cursor over the “OFF” field and
press the “OK/Select” key. “OFF” will change to “ON”. The automatic start has now been activated.
When the cursor is moved away from the field the end time of the program will be calculated and displayed.
Press the MENU key to return to the Main Men
24HR START
TIME ACTIVE END
1 PROG 01 0:00 OFF ______
2 PROG 01 0:00 OFF ______
3 PROG 01 0:00 OFF ______
4 PROG 01 0:00 OFF ______
5 PROG 01 0:00 OFF ______
6 PROG 01 0:00 OFF ______