Product Description
AT18HM-W-L Astronomic Programmable Timer, 15A, Flush mount, 120V, 1800W, Single Pole, 3-way, 1/2HP, White by Eaton is a programmable timer switch for indoor and outdoor lighting control that automatically adjusts dusk-to-dawn operation. With up to 7 customizable programs, multiple operating modes, and a back-lit LCD display, it delivers reliable scheduling, security, and manual override in a sleek, flush-mount design.
Quick Specs
- Rating: 15A, 1800W, 120VAC, 60Hz
- Install Type: Single pole or 3-way (not 4-way)
- Motor Rating: 1/2 HP
- Programs: 7 ON / 7 OFF programmable settings
- Modes: Manual, Automatic, Random, Countdown
- Backup: Built-in rechargeable battery backup up to 14 days (72 hour initial charge)
- Compliance: UL/cUL Listed, California Title 24 compliant
- Color: White
Free shipping on orders over $250
Product Benefits
- Automates dusk-to-dawn lighting: Astronomical scheduling helps keep exterior lights aligned with changing daylight throughout the year.
- Flexible control for real life: Choose manual, automatic, random, or countdown mode to match everyday routines and security needs.
- Reliable scheduling through outages: Built-in battery backup keeps programs protected during power interruptions for up to 14 days.
- Works like a standard wall switch: Manual override and a flush-mount design make it easy to upgrade from a typical on/off switch.
Key Features
- Astronomical feature: Automatically adjusts dusk-to-dawn times
- 7 customizable programs: Up to 7 unique schedules (7 ON / 7 OFF)
- Operating modes: Manual, Automatic, Random, Countdown
- Automatic daylight savings: Auto adjusts for daylight savings time
- Random mode security: Varies ON/OFF within 30 minutes of programmed times
- Back-lit LCD screen: Displays day, time, mode status, load ON/OFF, and programming status
- Single pole or 3-way wiring: Designed for common residential applications
- Battery backup: Rechargeable, non-replaceable battery (approx. 5-year battery life)
Specifications
Technical
| Voltage / Frequency | 120VAC, 60Hz |
| Resistive Rating | 15A |
| Max Load | 1800W |
| Wiring | Single pole or 3-way (not 4-way) |
Load Ratings
| Tungsten | 1200W |
| Ballast | 1200VA |
| LED | 150W |
| Electronic Ballast / LED | 5A (600W) |
| Motor | 1/2 HP |
Physical & Compliance
| Color | White |
| Mounting | Flush mount with standard wallplates |
| Listings / Compliance | UL/cUL Listed; California Title 24 compliant |
| Warranty | 2-year limited product warranty |
Applications
- Porch lighting: Automate dusk-to-dawn operation for consistent exterior illumination.
- Patio lighting: Set timed schedules or use countdown for temporary lighting needs.
- Dwelling sconce lights: Maintain reliable on/off routines for common areas or entries.
- Indoor lighting control: Program daily schedules for hallways, laundry rooms, or utility areas.
- Security when away: Use Random mode for occupancy simulation.
Installation Tips
- Turn power OFF: Switch off the circuit breaker before wiring.
- Neutral required: This timer requires a neutral wire in the wall box for proper operation.
- Use copper wire only: Follow standard wiring best practices and local electrical codes.
- Single pole or 3-way only: Designed for single pole and 3-way installations; not compatible with 4-way wiring.
- Battery conditioning: Allow 72 hours initial charge for the backup battery; backup can last up to 14 days during an outage.
- Set region and DST: Configure time, date, zone, and daylight savings for accurate astronomical operation.
FAQ
Does this timer automatically adjust for seasonal daylight changes?
Yes. The astronomical feature is designed to automatically adjust dusk-to-dawn times, helping schedules stay aligned with changing daylight conditions.
How many schedules can I program?
You can program up to 7 ON settings and 7 OFF settings for customized daily control.
What wiring types are supported?
It supports single pole and 3-way installations. It is not intended for 4-way installations.
Do I need a neutral wire?
Yes. A neutral wire is required in the switch box for proper installation and operation.
What loads can it control?
It is rated at 15A, 1800W, 120VAC, 60Hz and includes load ratings for tungsten, ballast, LED, and a 1/2 HP motor.
Will my programs be saved during a power outage?
Yes. The built-in rechargeable battery backup protects programmed settings during outages for up to 14 days when fully charged.
Does it support a security random mode?
Yes. Random mode varies ON/OFF times within 30 minutes of programmed settings to add security when away.
Is it compliant with California Title 24?
Yes. It is California Title 24 compliant and UL/cUL Listed.
