Intermatic HB51K 24-Hour Outdoor Timer with Photocell Sensor User Manual

1. Introduction

The Intermatic HB51K is a robust 24-hour outdoor timer designed to automate the operation of electrical devices such as landscape lighting, holiday decorations, and small pumps. Equipped with a photocell light sensor, this weatherproof unit automatically activates connected devices at dusk and deactivates them at dawn or after a user-selected duration. Its durable construction ensures reliable performance in various outdoor conditions.

2. Safety Information

Please read and understand all instructions before installing or operating this product. Failure to follow these instructions may result in electric shock, fire, or property damage.

• Electrical Hazard: Always ensure the timer is unplugged from the power source before making any adjustments or connections.
• Outdoor Use: This timer is rated for outdoor use in damp locations and is rainproof. However, ensure it is plugged into a Ground Fault Circuit Interrupter (GFCI) protected outdoor receptacle.
• Load Capacity: Do not exceed the maximum electrical ratings of 8 Amps or 1000 Watts. Overloading the timer can cause overheating and fire.
• Grounding: The timer features a 3-prong grounded plug and receptacles. Always use with properly grounded outlets.
• Children: Keep out of reach of children.

3. Package Contents

• One (1) Intermatic HB51K Outdoor Timer Unit

4. Features

• Easy-to-use rotary dial with multiple settings.
• Photocell sensor for automatic dusk activation.
• Selectable countdown durations: 2, 4, 6, or 8 hours from dusk.
• Dusk-to-Dawn operation mode.
• Always ON function for continuous power.
• LED power indicator light.
• Weatherproof and suitable for damp locations.
• Two (2) 3-prong grounded receptacles.
• Integrated 7-inch light-duty cord with 3-prong plug.

5. Setup and Installation

5.1 Placement

Select an outdoor location that is protected from direct heavy rain and allows the photocell sensor to accurately detect natural ambient light. Avoid areas where artificial light sources (e.g., porch lights, streetlights) might shine directly onto the sensor, as this can interfere with its operation. Mount the timer vertically with the outlets facing downwards to ensure proper drainage and weather resistance.

5.2 Mounting

The HB51K is designed for plug-in mounting. A hanging tab is provided on the back of the unit for secure attachment to a screw or hook, if desired, after plugging it into a suitable outdoor receptacle.

Figure 1: Back view of the Intermatic HB51K outdoor timer. A hanging tab is visible at the top for mounting. The product label with model information and certifications is located on the back panel. The power cord is also visible, extending from the top.

5.3 Connecting Devices

1. Ensure the timer's rotary dial is set to the OFF position.
2. Plug the timer's 3-prong cord into a grounded, GFCI-protected outdoor electrical receptacle.
3. Plug your outdoor electrical devices (e.g., lights, pumps) into the two 3-prong receptacles located at the bottom of the timer.
4. Verify that the total load of all connected devices does not exceed 8 Amps or 1000 Watts.

Figure 2: This angled view of the Intermatic HB51K outdoor timer clearly shows the two 3-prong electrical receptacles located at the bottom of the unit. The rotary dial, power indicator, and photocell sensor are also visible on the front face, along with the attached power cord.

6. Operation

6.1 Rotary Dial Settings

The Intermatic HB51K features a rotary dial to select the desired operating mode. Rotate the dial to align the indicator arrow with your chosen setting.

Figure 3: This image displays the front of the Intermatic HB51K outdoor timer. Visible features include the central rotary dial for setting timer functions (OFF, ON, DUSK-DAWN, 2H, 4H, 6H, 8H), the 'POWER' indicator light, and the 'SENSOR' (photocell) on the right side. The attached power cord with a 3-prong plug is shown extending from the top.

• OFF: Power to the connected devices is completely turned off.
• ON: Power is continuously supplied to the connected devices, bypassing the timer and photocell functions.
• DUSK-DAWN: The connected devices will automatically turn on when the photocell sensor detects dusk and turn off when it detects dawn.
• 2H, 4H, 6H, 8H (Countdown from Dusk): The connected devices will automatically turn on when the photocell sensor detects dusk and remain on for the selected duration (2, 4, 6, or 8 hours), then turn off.

6.2 Photocell Sensor

The integrated photocell sensor detects ambient light levels to activate the timer's dusk-related functions. For optimal performance, ensure the sensor is not obstructed by objects or exposed to direct artificial light sources at night.

6.3 LED Power Indicator

A red LED light labeled 'POWER' on the front of the unit illuminates when the timer is receiving electrical power. This indicates the unit is operational.

Figure 4: This image illustrates the Intermatic HB51K outdoor timer in use, plugged into a standard outdoor wall receptacle. A green extension cord is connected to one of the timer's outlets, demonstrating its application for powering external devices. The red LED power indicator light is illuminated, signifying that the unit is receiving power.

7. Maintenance

• Keep the photocell sensor clean and free from dust, dirt, or debris to ensure accurate light detection.
• Periodically inspect the power cord, plug, and timer housing for any signs of damage, wear, or corrosion. Discontinue use if damage is found.
• When not in use for extended periods, unplug the timer and store it in a dry, protected location.

8. Troubleshooting

9. Specifications

• Brand: Intermatic
• Model: HB51K
• Material: Plastic
• Color: Black
• Voltage: 120 Volts AC
• Amperage Capacity: 8 Amps
• Wattage: 1000 Watts
• Number of Outlets: 2 (3-prong receptacles)
• Cord Length: 7 inches
• Mounting Type: Plug-In Mount
• Switch Style: SPST
• Product Dimensions: Approximately 3 x 1.75 x 5 inches
• Item Weight: Approximately 0.96 ounces
• Included Components: Outdoor Timer

10. Warranty and Support

10.1 Warranty

The Intermatic HB51K Outdoor Timer is covered by a 1-year limited warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use. For specific terms and conditions, please refer to the warranty documentation included with your product or contact Intermatic customer service.

10.2 Customer Support

For technical assistance, troubleshooting, or warranty claims, please contact Intermatic customer service. Visit the official Intermatic website for contact information and additional resources.