Overview of Irritrol Rain Dial
The Irritrol Rain Dial, a versatile sprinkler controller, evolved from the 1990s Hardie models to today’s RD‑600, RD‑900, and RD‑1200 series. It offers manual and automatic modes, non‑volatile memory, and rain sensor integration for efficient irrigation scheduling. Simplifies setup and maintenance. now!
Historical Development
In the early 1990s, the Rain Dial was introduced by Hardie, a pioneer in irrigation controllers. The original models featured a simple dial interface and manual programming, appealing to homeowners and small commercial users. Hardie’s design emphasized durability and ease of use, with a robust housing that protected the electronics from weather and vibration. As the market for automated irrigation grew, Hardie partnered with Irritrol, a company known for its advanced rain sensors and smart irrigation solutions. This collaboration brought the Rain Dial into the Irritrol product line, where it was rebranded and enhanced with non‑volatile memory, allowing programs to persist after power loss.
By the mid‑2000s, Irritrol had refined the Rain Dial architecture, introducing the RD‑600 and RD‑900 series. These models incorporated a microcontroller capable of handling multiple zones, rain sensor inputs, and programmable schedules. The RD‑1200 series, released in the late 2000s, added support for up to 12 zones and integrated a more sophisticated user interface, including a backlit display and optional remote programming via a handheld controller. Each iteration focused on improving reliability, expanding feature sets, and simplifying the programming workflow.
The acquisition of Irritrol by Toro in 2010 further accelerated development. Toro leveraged its extensive distribution network and technical expertise to streamline manufacturing, reduce costs, and expand the Rain Dial’s compatibility with third‑party sensors and controllers. Today, the Rain Dial remains a staple in residential and light commercial irrigation, celebrated for its straightforward design, robust performance, and the rich history that traces back to Hardie’s original vision of user‑friendly irrigation control.
During the 2010s, the Rain Dial series saw integration with IoT platforms, allowing remote monitoring via smartphone apps. The firmware was updated to support Wi‑Fi modules, and the controllers gained compatibility with weather data feeds for adaptive watering schedules. These updates preserved the core dial interface while adding modern connectivity, ensuring the Rain Dial stayed relevant in a rapidly evolving irrigation landscape.
Manufacturers also introduced a new line of high‑current models, enabling larger irrigation systems with up to 12 zones, while maintaining the same intuitive dial operation. The RD‑1200’s upgraded power supply and improved rain sensor circuitry reduced false triggers, enhancing water‑saving efficiency across diverse climates.
Key Features
The Irritrol Rain Dial combines classic dial control with modern automation. Its non‑volatile memory retains schedules after power loss, while the built‑in rain sensor automatically suspends watering during precipitation. The controller supports up to 12 zones, each with independent start times, durations, and repeat counts. A backlit display shows current time, active valves, and remaining run time, making on‑site adjustments simple. Programmable manual mode lets users spin the dial to set a zone’s run time instantly, ideal for quick changes. Automatic mode offers a full 24‑hour schedule, with options for day‑of‑week or every‑day activation. The Rain Dial’s compact housing protects electronics from weather, and its low‑power design extends battery life. Firmware updates can be applied via a USB port, adding new features or fixing bugs without replacing hardware. Compatibility with external sensors and remote controllers expands flexibility for larger irrigation systems.
- Built‑in rain sensor with threshold to prevent watering during wet conditions.
- Non‑volatile memory stores 24‑hour schedules, retaining data after power loss.
- Manual mode allows zone activation by spinning the dial, ideal for on‑the‑spot changes.
- Automatic mode supports every‑day programming with repeat counts for each zone.
- LCD display shows time, active valves, and remaining run time for monitoring.
- USB port enables updates, expanding features without hardware replacement;
Best for home use!!!
Model Series
The RD‑600, RD‑900, and RD‑1200 series differ in power and zone capacity. RD‑600 handles up to 6 zones, RD‑900 up to 9, and RD‑1200 up to 12. All models share a dial interface, rain sensor, and non‑volatile memory, but larger units offer scheduling flexibility and amp ratings!
RD-600 / RD-900 Series
The RD‑600 and RD‑900 models are the most common Irritrol Rain Dial controllers, offering a balance between simplicity and functionality. Both units feature a 12‑hour dial that displays the current time, active zone, and remaining run time. The RD‑600 supports up to six zones, while the RD‑900 can handle nine, making them suitable for small to medium landscapes. Each controller includes a built‑in rain sensor that automatically pauses irrigation when precipitation is detected, preventing overwatering and conserving water. The non‑volatile memory keeps programming intact after power loss, and manual mode lets users start or stop zones instantly by turning the dial. Automatic mode scheduling is accessed by selecting the desired program from the menu, then setting start times, durations, and repeat patterns. The controllers support up to 12 programs per zone, allowing different schedules for weekdays, weekends, or specific dates. The LCD display shows the current program, zone status, and any error messages. During installation, mount the controller on a dry, shaded surface to protect the electronics from weather. The RD‑600 and RD‑900 are powered by a 12‑V DC supply, with a 2‑amp rating for the RD‑600 and a 3‑amp rating for the RD‑900. Maintenance involves checking the rain sensor’s battery, cleaning the dial, and ensuring that zone leads are leak‑free. Firmware updates can be applied via the controller’s USB port or through the Irritrol website, adding new features and bug fixes. Overall, the RD‑600 and RD‑900 series deliver reliable, user‑friendly irrigation control for residential and commercial applications alike. They also support Wi‑Fi modules for remote control.
RD-1200 Series
The RD‑1200 series is Irritrol’s flagship controller, designed for large irrigation systems with up to 12 zones and 12 programs per zone. It features a 12‑hour dial with an LCD that displays the current time, zone status, and remaining run time. The controller supports both manual and automatic modes, allowing instant zone activation or scheduled watering. Built‑in rain sensor integration pauses irrigation when precipitation is detected, conserving water and preventing overwatering. The RD‑1200 uses a 12‑V DC supply with a 3‑amp rating, and its non‑volatile memory retains programming even after power loss. Installation requires mounting the unit on a dry, shaded surface and connecting zone leads to the correct terminals. The controller’s USB port enables firmware updates and diagnostic access via the Irritrol website or Rain Dial Doctor software. Maintenance involves checking the rain sensor battery, cleaning the dial, and inspecting zone connections for leaks. The RD‑1200 also supports optional Wi‑Fi modules for remote control, providing flexibility for advanced irrigation management. Overall, the RD‑1200 delivers robust, scalable control for residential, commercial, and agricultural applications.
The RD‑1200’s interface is with a rotary dial that starts or stops zones instantly. Its LCD shows time, zone status, and remaining run time. A reset button on the back panel restores factory defaults. Users can load firmware via the serial port, linking the controller to home‑automation platforms. The durable housing shields the unit from rain, dust, and temperature extremes, guaranteeing dependable performance.
Installation and Programming
Follow the manual’s step‑by‑step guide: mount the unit, connect 12‑V power, wire zones, and attach the rain sensor. Use the dial to set time, then program zones manually or schedule automatic runs. Save settings; firmware updates keep it current. All steps manual!!!
Hardware Setup
Choose a dry, shaded spot within 10 ft of the 12‑V supply and easy access to the panel. Unbox the RD‑600/900/1200 and verify controller, power supply, rain sensor, and harnesses. Mount the unit on a wall or pegboard with screws, keeping the dial face visible and the door clear. Connect the 12‑V supply to the controller’s input terminals, observing polarity. Attach the rain sensor: red wire to “RAIN”, black to “GND”. Wire zone leads from the controller’s zone terminals to the corresponding valve, using color‑coded cable (red for zone 1, yellow for zone 2, etc.). Close the door and secure it. Check the LED: steady green means correct voltage. Press “SET” to enter programming mode, then use the dial to set the current time and date; settings are saved in non‑volatile memory. For outdoor units, use a weather‑proof enclosure and seal cable entries with silicone to prevent moisture. Ground the controller to the building’s electrical system to reduce interference. Test each zone by manually running the valve from the dial; if a zone fails, check wiring continuity and replace damaged cable. Keep a spare battery in the battery compartment for backup power. Document the wiring diagram for future maintenance. All connections should be insulated with heat‑shrink tubing to prevent shorts. If the LED flashes red, consult the error code guide. Label each wire for easy identification during maintenance. Wiring rated 10A.
Manual Mode Configuration
To use the Rain Dial in manual mode, press the SET button until the display shows MANUAL. Rotate the dial to the desired zone; the zone number lights up. Press START to begin irrigation. The timer will run until the preset duration expires or until you press STOP. To adjust run time, press SET again, rotate the dial to the zone, then use the + or ⏤ buttons to change minutes. The display updates in real time. For multiple zones, repeat the process for each zone; the controller remembers the last set time for each zone. If you need to pause irrigation, press PAUSE; to resume, press RESUME. To cancel a manual run, press CANCEL and the zone will return to OFF. Manual mode overrides any scheduled program, so ensure automatic mode is disabled by selecting AUTO from the main menu. Use the INFO button to view current settings, battery status, and error codes. All manual adjustments are saved instantly in non‑volatile memory, so power loss will not erase your settings; For troubleshooting, consult the error code list in the manual. Remember to close the controller door after programming to prevent dust ingress. When operating in manual mode, the controller does not rely on the rain sensor; it will run the zone regardless of precipitation. If a backup battery is installed, the controller will continue to function during a power outage, preserving the manual run until the battery is depleted. Verify that the zone valve is closed switching modes to avoid leaks.
Automatic Mode Scheduling
To schedule irrigation automatically, press the SET button until the display shows AUTO. Rotate the dial to select the desired zone, then press START to enter the zone’s schedule screen. Use the + and ⏤ buttons to set the start time, and again to set the run duration. The display will show the time in HH:MM format and the remaining minutes. Press SET to confirm each entry. Repeat the process for each zone you wish to program. The Rain Dial supports up to 12 zones, each with its own schedule. After setting all zones, press EXIT to return to the main menu. The controller will automatically run the programmed times, unless a rain sensor is connected; in that case, the sensor will override the schedule if precipitation is detected. To modify an existing schedule, select the zone, press SET, adjust the time or duration, then confirm. The controller’s non‑volatile memory preserves all schedules, so power loss does not erase your settings. When operating in automatic mode, the Rain Dial uses its internal clock to trigger programs at the designated times. The clock can be set by pressing the CLOCK button and rotating the dial to the correct hour and minute. The controller also offers a DAY button to cycle through the days of the week, allowing you to create different schedules for weekdays and weekends. If a zone is set to run on multiple days, simply press SET for the zone, then use the DAY button to toggle each day’s activation. The display will show a checkmark next to active days. The Rain Dial pauses irrigation when the rain sensor detects precipitation; enable this by pressing RAIN. Common error codes include ERR01 for low battery. Updating firmware can be done via the UPDATE button, which will prompt the user to connect a USB drive containing the latest firmware file. The controller will then flash the new firmware and reboot. After updating, re-enter your schedules to ensure they were retained. Regularly inspect the rain sensor probe for corrosion and clean it with a soft cloth. The controller’s robust design allows it to operate in temperatures ranging from -20°F to 120°F, making it suitable for most climates.
Maintenance and Support
Routine checks include cleaning the rain sensor, inspecting wiring, and verifying the battery. Replace the battery every 2–3 years. Firmware updates are available via the controller’s USB port. For troubleshooting, consult the manual contact Irritrol supportfor assistance.
Common Issues and Fixes
Common problems with the Irritrol Rain Dial include the controller not powering on, valves failing to activate, the rain sensor not detecting precipitation, and the display showing incorrect time. Power issues are often due to a dead battery or a loose connection; replace the 9‑V battery and check the terminal screws. Valve failures usually stem from clogged solenoids or faulty wiring; clean the valve ports and inspect the cable for damage. If the rain sensor fails to trigger, clean the sensor glass, ensure it is level, and verify the rain sensor cable is intact. Time errors can result from a corrupted firmware or incorrect time zone settings; reset the clock via the “Set Time” function or update the firmware using the USB port. For any persistent glitches, perform a factory reset by holding the “Reset” button for 10 seconds, then re‑program the controller.
Another frequent issue is the rain delay feature not functioning; this can be caused by a miswired rain sensor cable or a faulty sensor module. Inspect the cable for kinks, ensure the connector is seated, and replace the sensor if the glass is cracked. A common symptom of a bad power supply is intermittent valve operation; check the voltage at the controller’s power input and replace the supply if it falls below 12 V.
When the display shows “Error”, it may indicate a firmware corruption. Perform a factory reset by holding the “Reset” button for 10 seconds, then re‑program the controller. If problems persist, contact Irritrol support for a firmware update or replacement parts. Now.
Firmware Updates
Updating the firmware on an Irritrol Rain Dial ensures the controller runs the latest features, bug fixes, and improved rain‑sensor algorithms. The process is straightforward and can be completed in a few minutes with a standard USB cable and a PC running Windows or macOS. First, download the latest firmware package from the Irritrol support website. The package contains a .zip archive with two files: a firmware image (.bin) and a companion utility (RainDialUpdater.exe or RainDialUpdater.app). Extract the archive and launch the utility. The program will detect the Rain Dial model automatically when the controller is connected via the USB port on the back panel. If the device is not recognized, verify that the USB cable is fully seated and that the controller is powered on. Once detected, the utility will display the current firmware version and the available update. Click “Update” and confirm the action. The utility will erase the existing firmware, flash the new image, and perform a checksum verification. When the process completes, the Rain Dial will reboot and the display will show the new version number. It is recommended to perform a backup of the current program settings before updating, as the firmware update may reset the non‑volatile memory. To back up, use the “Save Program” option in the Rain Dial’s menu and store the file on a USB drive. After the update, re‑import the backup file if necessary. Firmware updates are typically released annually or when significant bugs are identified. OK