Rain Bird TRU4I Indoor Irrigation Controller — 4-Zone Program-Based Timer, WiFi-Ready

The Rain Bird TRU4I is a program-based indoor irrigation controller that manages up to four zones with flexible scheduling, manual station control, and optional WiFi connectivity via the LNK2 module.

Designed for residential landscapes that need professional-level control, the TRU4I combines straightforward dial programming with advanced features like multiple programs per zone, season adjust, and built-in surge protection. The unit stores settings through power interruptions, mounts indoors in a sealed enclosure to resist moisture and pests, and accepts common 24 VAC irrigation valves. Add the Rain Bird LNK2 WiFi Module (sold separately) to enable smartphone control and WaterSense-compatible smart scheduling when paired with a rain sensor.

How does the TRU4I simplify daily watering schedules?

The TRU4I uses program-based logic so each zone gets tailored run times and start times without complex setup. You can assign up to three programs (A, B, C) to each zone and schedule up to four start times per program for fine-grained control.

• Three independent programs per zone (A, B, C)
• Up to four start times per program (12 total start times per zone)
• Watering options: days of week, odd/even calendar days, or cyclic 1–30 days
• Run durations: 1 minute to 6 hours

What manual and override options are available for quick adjustments?

Manual Station mode lets you start a single zone, all zones, or a whole program instantly for maintenance or spot watering. Season Adjust and Rain Delay provide rapid global or program-specific adjustments without reprogramming individual zones.

• Manual Station: single zone, all zones, or program watering
• Season Adjust: change runtimes 5%–200% globally or by program
• Rain Delay: suspend watering 1–14 days or use a compatible rain sensor
• Permanent Days Off: block watering on scheduled crew days

Can the controller handle professional features and safety protections?

Yes — the TRU4I includes pro-level controls like interstation delay, master valve or pump start relay control, and zone-level rain sensor bypass. It also protects programming with non-volatile memory and a lithium clock battery, and built-in surge protection guards against power spikes.

• Interstation delay adjustable from 1 second to 9 hours
• Master valve/pump start relay and valve troubleshooting with warnings
• Save/restore programming and reset to factory defaults
• Non-volatile memory plus lithium battery for clock/time retention

How do I add remote control and meet WaterSense criteria?

To enable remote control and smartphone scheduling, insert the Rain Bird LNK2 WiFi Module (sold separately) into the TRU4I. When combined with a compatible rain sensor, this setup meets EPA WaterSense criteria for efficient irrigation management.

• LNK2 WiFi Module upgrade for iOS and Android mobile control
• Compatible with most 24 VAC irrigation valves and rain sensors
• Meets WaterSense criteria when paired with LNK2 module and rain sensor
• Includes transformer power plug, 6' power cord, and user manual

Who is this for: The Rain Bird TRU4I is ideal for homeowners, landscape contractors, and property managers who need reliable indoor-mounted irrigation control for small to medium properties. If you want program flexibility, professional features without complex installation, and the option to upgrade to WiFi-based remote management, the TRU4I delivers a compact, durable solution for efficient zone-by-zone watering.