Intermatic Digital Timer Manual: A Comprehensive Guide
This manual details Intermatic digital timers, offering guidance on setup, programming, troubleshooting, and applications for lighting, appliances, and pool equipment control.

Understanding Intermatic Timers
Intermatic timers are renowned for reliable load control across diverse applications, from simple lighting schedules to complex pool and spa automation. They offer a broad portfolio including electronic, mechanical, and astronomic time switches. These devices optimize energy usage and enhance security through programmable on/off cycles. Intermatic provides solutions for residential, commercial, and industrial needs, backed by robust warranties and dedicated customer support, ensuring long-term performance and peace of mind.
What is an Intermatic Digital Timer?
An Intermatic digital timer is an electronic device used to automate the switching of electrical circuits based on pre-programmed schedules. Unlike mechanical timers, digital models offer precise timing, 7-day programming, and advanced features like astronomic timing. They control lighting, appliances, and equipment, optimizing energy use and providing security. Available in plug-in and switch formats, they cater to various applications and voltage requirements.
Common Intermatic Timer Models
Intermatic offers a diverse range of digital timers. The DT620 is a heavy-duty plug-in timer ideal for indoor use, while the EB800 series provides robust 4-circuit control in a metal enclosure. The TB320 series offers astronomic timing in a compact design. These models, alongside others, cater to residential, commercial, and industrial needs, offering varying amperage and circuit configurations.
DT620 Heavy Duty Digital Plug-in Timer
The Intermatic DT620 is a versatile, indoor digital timer designed for controlling lights, fans, and small appliances. Featuring full 7-day programming, it allows for customized on/off schedules. Its heavy-duty construction ensures reliability, and it benefits from a 3-year protection plan, offering peace of mind for everyday load control needs.
EB800 Series Digital Time Switch
The EB800 series offers astronomic time switching capabilities for outdoor applications, housed in a durable metal enclosure. This 120-277 VAC electronic control features 4-SPST circuits, ideal for managing complex lighting or equipment schedules. It’s designed for commercial and industrial use, providing reliable, automated control of electrical loads.
TB320 Series Digital Time Switch
The TB320 series provides a robust solution for 24-hour or 7-day time control, featuring 2xSPST, 2-circuit functionality. This electronic time switch is suitable for various applications, including water pumps, fans, and heaters. Its reliable design and ease of programming make it a popular choice for everyday load control needs.
Key Features of Intermatic Digital Timers
Intermatic digital timers boast advanced features like 7-day programming for customized schedules and astronomic time switch functionality, adjusting to sunrise/sunset. They commonly utilize SPST and SPDT circuits for versatile control. These timers optimize energy usage, enhance security through randomization, and offer reliable performance across diverse applications.
7-Day Programming Options
Intermatic’s 7-day programming allows users to create unique on/off schedules for every day of the week. This feature provides granular control over connected devices, optimizing energy consumption and automating tasks. Customize settings for lighting, appliances, or pool equipment, tailoring operation to specific needs and routines for maximum convenience.
Astronomic Time Switch Functionality
Intermatic’s astronomic time switch automatically adjusts on/off times based on calculated sunrise and sunset for a specific location. This eliminates manual adjustments for changing daylight hours, ensuring lights activate at dusk and deactivate at dawn. It’s ideal for outdoor lighting, offering energy savings and enhanced security without constant reprogramming.
SPST and SPDT Circuits
Intermatic timers utilize SPST (Single Pole Single Throw) and SPDT (Single Pole Double Throw) circuits for controlling electrical loads. SPST simply opens or closes a circuit, while SPDT offers a common terminal and two output options, enabling more versatile control of devices like motors or lights.
Setting Up Your Intermatic Digital Timer
Initial setup involves powering on the timer and accurately setting the current date and time. This foundational step ensures correct scheduling. Refer to your specific model’s instructions for button functions. Precise timekeeping is crucial for reliable operation, especially with astronomic features, guaranteeing automated control as desired.
Initial Power-Up and Date/Time Setting
Upon initial power-up, the timer may prompt for date and time input. Use the ‘Hour,’ ‘Minute,’ ‘Day,’ ‘Month,’ and ‘Year’ buttons to adjust settings. Confirm accuracy, as this dictates scheduling. Some models automatically synchronize time; consult your manual. Incorrect settings lead to inaccurate operation, so double-check before proceeding to programming.
Programming On/Off Schedules
To program schedules, access the ‘Program’ mode using the timer’s buttons. Define on/off times for each day or select pre-set options like ‘Weekday’ or ‘Weekend.’ Utilize the ‘Hour’ and ‘Minute’ buttons for precise timing. Save each schedule individually. Review programmed settings to ensure they align with desired operation, preventing unexpected behavior.

Advanced Programming Features

Intermatic timers offer features beyond basic scheduling. Randomization simulates occupancy for enhanced security while away. Holiday/Event programming overrides regular schedules for specific dates. Explore astronomic timing for sunrise/sunset-based operation. These advanced options provide flexibility and customization, optimizing energy usage and enhancing control over connected devices.
Randomization for Security
The randomization feature enhances home security by varying on/off times. Instead of predictable schedules, the timer subtly alters activation times, mimicking actual occupancy patterns. This deters potential intruders, creating the illusion someone is home. It’s a simple yet effective security measure, adding peace of mind when traveling or away for extended periods.
Holiday/Event Programming
Intermatic timers simplify managing lighting during vacations or special events. This feature allows users to program specific on/off schedules for extended periods, like holidays. Easily override regular settings without completely resetting the entire program. Ensure a lived-in look while away, enhancing security and providing convenient control over your home’s ambiance.
Troubleshooting Common Issues
Encountering problems with your Intermatic timer? This section addresses frequent concerns like the timer failing to activate or display errors. Common issues include incorrect date/time settings or power supply problems. Review display codes for specific error messages and consult the manual for solutions. Proper troubleshooting ensures optimal timer performance and longevity.
Timer Not Turning On/Off
If your Intermatic timer isn’t operating as expected, first verify the power source and connections. Ensure the programmed schedule aligns with the current time and day. Check for tripped breakers or blown fuses. A faulty load or incorrect wiring can also prevent operation; double-check these elements carefully before proceeding.
Display Errors and Codes
Intermatic timers utilize error codes to signal malfunctions. Consult the specific model’s documentation for a comprehensive list and their meanings. Common issues include low battery warnings or communication errors. Resetting the timer may resolve some codes, but persistent errors indicate a potential hardware failure requiring professional assistance or product replacement.

Safety Precautions
Always disconnect power before installation or servicing. Ensure the timer is appropriately rated for the connected load to prevent overheating and fire hazards. Avoid outdoor use unless the timer is specifically designed for it. Regularly inspect wiring for damage and never operate a timer with a compromised enclosure, safeguarding against electrical shock.
Electrical Safety Guidelines
Prioritize safety: disconnect power before any wiring. Use appropriately sized wiring for the amperage load. Never exceed the timer’s voltage or amperage ratings. Ensure proper grounding to prevent electrical shock. Avoid wet environments unless the timer is weatherproof-rated. Inspect wiring regularly for damage, and consult a qualified electrician if unsure.
Proper Usage and Environmental Considerations
Utilize timers within their specified operating temperature ranges. Avoid extreme humidity or direct sunlight for indoor models. Outdoor timers require weatherproof enclosures. Do not tamper with internal components. Regularly clean the timer with a dry cloth. Consider energy conservation by optimizing schedules. Dispose of old timers responsibly, following local regulations.
Intermatic Timer Applications
Intermatic timers excel in diverse applications, including precise indoor and outdoor lighting control, automating fans and heaters for energy savings, and managing pool and spa equipment efficiently. They’re ideal for water pumps, and various electrical loads. Intermatic solutions support residential, commercial, and industrial needs, offering versatile control options.
Lighting Control (Indoor/Outdoor)
Intermatic timers provide automated lighting solutions for both indoor and outdoor spaces, enhancing security and convenience. Programmed schedules simulate occupancy, deterring potential intruders. Optimize energy usage by controlling lights based on astronomic timing or custom schedules, reducing costs and extending bulb life. Reliable control for landscape lighting is ensured.
Appliance Control (Fans, Heaters)

Intermatic digital timers efficiently manage appliance operation, including fans and heaters, optimizing comfort and energy savings. Schedule fans to circulate air during peak hours or heaters to pre-warm spaces before arrival. This automated control reduces energy waste and extends appliance lifespan. Reliable operation for consistent comfort is guaranteed.
Pool and Spa Equipment Control

Intermatic timers provide precise control over pool and spa equipment, automating pump and heater schedules for optimal performance and cost efficiency. Programmed operation ensures water circulation, sanitation, and temperature maintenance without manual intervention. This extends equipment life, minimizes energy consumption, and delivers a consistently enjoyable aquatic experience.
Warranty Information and Product Registration
Intermatic products are backed by a standard warranty covering defects in materials and workmanship. Registration online enhances support and provides access to important updates and policy information. Registering your Intermatic timer ensures efficient warranty service should any issues arise, demonstrating commitment to product quality and customer satisfaction.
Standard Warranty Coverage
Intermatic’s standard warranty safeguards against manufacturing defects for a defined period, typically one to three years depending on the specific product model. This coverage encompasses repair or replacement of faulty components, excluding damage from misuse, improper installation, or natural disasters. Review specific terms for detailed limitations.
Online Product Registration Process
Registering your Intermatic timer online streamlines warranty claims and unlocks access to enhanced support resources. Visit the official Intermatic website and locate the product registration section. You’ll need the model number, date of purchase, and potentially a serial number. Complete the form, and retain the confirmation for your records.
Where to Find Additional Resources
For comprehensive support, explore the Intermatic official website, offering detailed product information, FAQs, and downloadable manuals. Their award-winning customer support and sales teams are readily available to answer questions. Utilize websitefeedback@intermatic.com for site feedback, ensuring continuous improvement and a user-friendly experience.
Intermatic Official Website

The Intermatic website serves as a central hub for all product-related resources, including detailed specifications, application guides, and the latest policy updates. Users can access warranty information, register their products for enhanced support, and browse an extensive catalog of electrical, HVAC/R, and pool/spa solutions.
Customer Support Contact Information
Intermatic boasts an award-winning customer support team readily available to assist with any inquiries regarding their digital timers and other products. For immediate assistance, explore the website’s FAQ section or reach out to their dedicated sales teams. Feedback is valued; use websitefeedback@intermatic.com for suggestions.
Understanding Astronomic Time Switching
Intermatic’s astronomic time switches automatically adjust on/off times based on calculated sunrise and sunset, eliminating manual adjustments for seasonal changes. This feature optimizes lighting schedules, enhancing energy efficiency and security. Utilizing latitude and longitude, these timers provide precise control, ideal for outdoor applications.
How Astronomic Timing Works
Astronomic timing calculates sunrise and sunset based on your location’s longitude and latitude, factoring in the equation of time and declination. Intermatic timers use this data to automatically adjust switching times daily, mirroring natural daylight patterns. This eliminates the need for manual adjustments as seasons change, providing consistent and accurate operation.
Benefits of Using Astronomic Timing

Astronomic timing offers significant energy savings by precisely controlling lights and equipment based on available daylight. It enhances security by simulating occupancy, and reduces manual adjustments, ensuring convenience. This feature optimizes lighting schedules, aligning with natural light, and provides reliable, automated control for various applications.
Comparing Digital vs. Mechanical Timers
Digital timers provide precise programming, multiple on/off settings, and advanced features like astronomic timing and randomization. Mechanical timers are simpler, reliable, and require less maintenance, ideal for basic scheduling. Digital options excel in complex control needs, while mechanical timers suit straightforward applications, offering a cost-effective solution.

Advantages of Digital Timers
Intermatic’s digital timers offer superior precision and flexibility with full 7-day programming and astronomic time switch functionality. They enable randomized schedules for enhanced security and simplify complex load control. Digital models often include features like remote control via Wi-Fi, providing convenience and energy savings.
When to Choose a Mechanical Timer
Intermatic mechanical time switches are ideal for basic, reliable load control where complex scheduling isn’t needed. They excel in applications like water pumps, fans, and lights, offering low maintenance and dependable operation. These timers are a cost-effective solution for everyday needs, proving robust in various environments.
Intermatic Timer Specifications
Intermatic timers boast diverse voltage and amperage ratings, accommodating various electrical loads. Models range from 120-277 VAC to 30 Amp capabilities. Environmental operating conditions typically span wide temperature ranges, ensuring functionality in diverse climates. Specific specifications vary by model; consult product datasheets for detailed information.
Voltage and Amperage Ratings
Intermatic timers support a broad spectrum of electrical requirements, featuring models from standard 120V to 277V AC voltage ranges. Amperage ratings commonly include 15A, 20A, and 30A options, suitable for diverse loads. Always verify the timer’s specifications match your appliance’s power needs for safe operation.
Environmental Operating Conditions
Intermatic timers are designed for reliable performance in typical indoor and outdoor environments. Operating temperature ranges generally fall between 32°F and 140°F (0°C to 60°C). Many models feature weatherproof enclosures for enhanced durability. Avoid exposure to extreme humidity, direct sunlight, or corrosive substances to ensure longevity and proper function.
Wi-Fi Enabled Intermatic Solutions
Intermatic offers Wi-Fi enabled timers providing remote control and monitoring via smartphone or tablet. These solutions integrate seamlessly with popular smart home systems like Google Assistant and Amazon Alexa, enabling voice control and automated scheduling. Enjoy convenient access and enhanced energy management from anywhere, optimizing comfort and efficiency.
Remote Control and Monitoring
Wi-Fi enabled Intermatic timers allow users to control and monitor their devices remotely through a dedicated mobile application. Adjust schedules, turn devices on or off, and receive real-time status updates from anywhere with an internet connection. This feature provides convenience and peace of mind, enhancing overall control.
Integration with Smart Home Systems
Intermatic’s Wi-Fi timers seamlessly integrate with popular smart home ecosystems like Amazon Alexa and Google Assistant. Voice control functionality enables hands-free operation, allowing users to manage connected devices simply by speaking commands. This integration streamlines automation and enhances the overall smart home experience.
Surge Protection and Intermatic Timers
Protecting valuable equipment from power surges is crucial, and Intermatic offers dedicated surge protection devices. These devices safeguard timers and connected loads against damaging voltage spikes. Combining a timer with surge protection ensures reliable operation and extends the lifespan of both the timer and the controlled appliances.
Importance of Surge Protection
Power surges, even minor ones, can degrade electronic components over time, leading to premature failure. Intermatic surge protection devices divert excess voltage, shielding sensitive timers and connected appliances. Investing in surge protection is a proactive measure, preventing costly repairs or replacements and ensuring consistent, dependable performance of your electrical systems.
Intermatic Surge Protection Devices
Intermatic offers a range of surge protection solutions, from individual outlet protectors to whole-house systems. These devices safeguard timers, lighting controls, and valuable appliances against damaging voltage spikes. Selecting the appropriate surge protector depends on the specific application and level of protection required, ensuring optimal performance and longevity for your electrical investments;
