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Front view of Toro TMC-424E-OD outdoor modular irrigation controller showing enclosure door, LCD display, and module expansion slots.

Toro TMC-424E-OD Outdoor Modular Controller, 4–24 Stations

Brand: Toro
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$558.78
$426.07
SKU TMC-424E-OD

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The Toro TMC-424E-OD is an outdoor-rated modular irrigation controller designed for commercial and large residential sites. It ships with a 4‑station base module and can be expanded in the field to manage 4 to 24 stations using Toro TSM expansion modules, giving installers flexible station counts without replacing the controller.

  • Expandable modular design: Starts with a 4‑station TSM-4 base module and supports additional 4‑ and 8‑station TSM modules to reach up to 24 total stations.
  • Flow sensing and leak response: Supports Toro flow-sensing modules (TFS) to learn normal flow, detect leaks or line breaks, and trigger alarms or shutdowns.
  • Multiple master outputs: Configurable for up to four master valve/pump-start relays using controller and flow-module outputs for complex site requirements.
  • Power and surge protection: Available in 120 VAC (60 Hz) or 220/240 VAC (50 Hz) models; standard and high-surge protection options available to meet regional requirements.
  • Versatile programming: Four independent programs with multiple start times, program stacking (run up to three programs simultaneously), and cycle-and-soak options with runtimes in seconds or minutes.
  • Robust electrical output: 24 VAC station output with per-station and total-load limits; UL/cUL-listed transformer options on supported models.
  • Field-ready features: Removable controller module for remote programming, compatibility with wired and wireless rain sensors, and options for remote site management (TriComm).

Dimensions and weight are compact for easy installation: approximately 10 3/4" W x 10 1/4" H x 4 5/8" D (273 x 260 x 117 mm), with indoor and outdoor enclosure weights near 3.2–3.4 kg. Refer to the included Toro sell sheet, user guide, and quick reference for wiring diagrams, module part numbers (TSM-4, TSM-8, TSM-4F, TSM-8F), and complete specifications.

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Frequently Asked Questions

What station counts can this controller support?
The TMC-424E-OD ships with a 4‑station base module and expands with TSM 4‑ and 8‑station modules up to 24 stations.
Does the controller support flow sensing and alarms?
Yes. It accepts Toro flow-sensing modules that learn normal flow, detect leaks or breaks, and can trigger alarms or shutdowns.
What power and surge protection options are available?
Models are available for 120 VAC (60 Hz) or 220/240 VAC (50 Hz) and offer standard or high-surge protection options.
Can it run multiple programs at once and use cycle-and-soak?
Yes. The controller provides four programs, program stacking to run up to three simultaneously, and cycle-and-soak timing in seconds or minutes.

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