The Irritrol RD900-EXT-R Rain Dial-R is a nine-station outdoor irrigation controller for residential and light-commercial landscapes with more zones than a basic six-station system can support. It combines familiar dial-and-button programming with flexible schedules and compatibility with optional Irritrol weather, remote-control, and connected-management accessories. The outdoor cabinet is designed for exterior wall mounting, and the enclosure key is sold separately.
Three independent programs can separate turf, shrubs, drip irrigation, or other plant groups. Each program provides three daily start times for up to nine total starts. Station run time can be programmed from 1 to 59 minutes in one-minute increments or from 1.0 to 5.9 hours in six-minute increments. Water budgeting, monthly percentage presets, odd/even scheduling, skip-day intervals, excluded days, station delay, test-all-stations operation, and assignable pump/master-valve control help adapt the controller to different landscapes and water restrictions.
The controller is RainSensor-ready and supports optional Climate Logic weather sensing, SMRT Logic remote access, and CRR handheld remote operation. These accessories are sold separately. A 9-volt alkaline battery, also sold separately, supports armchair programming and keeps time and date during power interruptions.
Key Features
Nine fixed irrigation stations
Outdoor wall-mount cabinet
Three independent programs
Three start times per program
Run times from 1 minute to 5.9 hours
Weekly, odd/even, and interval watering schedules
Water budgeting with monthly percentage presets
Delay between stations for well recovery
Rain-sensor input with bypass
Assignable pump/master-valve circuit
Compatible with Climate Logic, SMRT Logic, and CRR accessories
Common Uses
Homes and small commercial properties with up to nine zones
Mixed lawns, planting beds, and drip areas
Outdoor replacement of a compatible nine-station Rain Dial controller
Systems that may add weather-based or remote control later
Compatibility and Installation Notes
This is the nine-station outdoor model. Use compatible 24 VAC irrigation valve solenoids and follow Irritrol installation instructions for wiring, grounding, sensors, and pump relays. Climate Logic, SMRT Logic, CRR remotes, rain sensors, the 9-volt battery, and the cabinet key are sold separately.
Frequently Asked Questions
Is RD900-EXT-R the outdoor model?
Yes. The EXT designation identifies the outdoor enclosure.
Does it include Wi-Fi or app control?
No. Optional SMRT Logic equipment is required for connected remote control.
Can it run different schedules for turf and drip zones?
Yes. The three independent programs can use different days, start times, and station assignments.
Why Buy the RD900-EXT-R from Big Frog Supply?
This page corrects the old indoor/outdoor labeling and clearly identifies the nine-station exterior model. Big Frog Supply also carries compatible Irritrol sensors, controller accessories, valves, and repair parts for maintaining the full irrigation system.
Product Videos
Product Type Outdoor irrigation controller
Manufacturer Part Number RD900-EXT-R
Station Count 9 fixed stations
Programs 3
Start Times 3 per program; 9 total
Station Run Times 1-59 minutes or 1.0-5.9 hours
Watering Schedules Days of week; odd/even; 1-31 day interval
Maximum Output per Station 24 VAC; 0.5 A
Maximum Output to Valves 24 VAC; 1.0 A including master valve/pump circuit
Transformer Input 120 VAC; 60 Hz
Transformer Output 24 VAC; 1.25 A
Battery 9V alkaline; not included
Sensor Input Included with bypass
Optional Connectivity Climate Logic; SMRT Logic; CRR remote
Height 7-3/4 in.
Width 10-3/4 in.
Depth 4 in.
Enclosure Outdoor wall mount
