1. Introduction
The SINOTIMER TM616 is a weekly programmable digital timer switch designed for controlling electrical equipment. It allows users to set specific ON/OFF times over a 24-hour or 7-day period, making it suitable for various household and industrial applications. This device features a built-in battery to retain programmed settings during power outages and offers manual override capabilities.
This manual provides detailed instructions for the installation, operation, and maintenance of your TM616 timer.
2. Product Features
- Weekly programmable with up to 17 ON/OFF settings per day or week.
- High capacity: 30 Amps (6500 Watts) at 250V AC.
- Wide voltage compatibility: AC 110V, 220V, or DC 12V (model dependent).
- Minimum interval setting: 1 minute.
- Built-in 1.2V 40mA rechargeable battery for memory backup (up to 60 days during power failure).
- Automatic time error correction: ±30 seconds per week.
- Manual ON/OFF control option.
- Din Rail mountable for easy installation in DB boards.
3. Safety Information
WARNING: Risk of Electric Shock. Installation should only be performed by a qualified electrician.
- Always disconnect power at the circuit breaker or fuse box before installing or servicing the timer.
- Ensure the voltage and current ratings of your electrical equipment do not exceed the timer's capacity (30A, 250V AC).
- Do not expose the timer to moisture or extreme temperatures outside its specified operating range (-20°C to +50°C).
- Verify all wiring connections are secure and correct according to the wiring diagram. Loose connections can cause overheating or fire.
- This device is designed for indoor use only.
4. Setup and Installation
4.1 Unpacking and Initial Inspection
Carefully remove the timer from its packaging. Inspect the device for any signs of damage. If damaged, do not install and contact your supplier.
4.2 Mounting
The TM616 timer is designed for Din Rail mounting. Securely attach the timer to a standard 35mm Din Rail within your electrical panel or enclosure.

Image 1: Rear view of the TM616 timer, illustrating the yellow Din Rail mounting clip. This clip allows the device to be securely attached to a standard Din Rail in an electrical enclosure.
4.3 Wiring
Refer to the wiring diagram printed on the side of the timer for correct connections. Ensure the power supply matches the timer's voltage rating (110V AC, 220V AC, or 12V DC, depending on your specific model). Connect the load (electrical equipment) to the output terminals. Ensure all connections are tight and insulated.

Image 2: Angled view of the TM616 timer, displaying the wiring diagram label on its side. This diagram provides essential information for connecting the power input and the electrical load to the timer.
4.4 Initial Power-Up and Battery Charging
After wiring, apply power to the timer. The built-in rechargeable battery will begin charging. For optimal battery backup performance, allow the timer to be powered for at least 4 hours before initial programming or if it has been stored for an extended period.
5. Operating Instructions

Image 3: Front view of the SINOTIMER TM616 digital timer, showing the LCD display and control buttons (Clock, Timer, Week, Hour, Minute, C/R, Manual).
5.1 Button Functions
- Clock: Used to set the current time and day.
- TIMER: Used to enter and exit programming mode for ON/OFF cycles.
- Week: Adjusts the day of the week.
- Hour: Adjusts the hour.
- Minute: Adjusts the minute.
- C/R (Cancel/Recall): Clears current settings or recalls saved programs.
- Manual: Toggles between ON, OFF, and AUTO modes.
5.2 Setting the Current Time and Day
- Press and hold the Clock button.
- While holding Clock, press Week to set the current day of the week.
- While holding Clock, press Hour to set the current hour.
- While holding Clock, press Minute to set the current minute.
- Release the Clock button to save the settings.
5.3 Programming ON/OFF Cycles (17 Settings)
The timer allows for up to 17 ON/OFF programs. Each program consists of an ON time and an OFF time.
- Press the TIMER button once. The display will show "1 ON".
- Press Week to select the desired day(s) for this program (e.g., MO, TU, WE, TH, FR, SA, SU, or combinations like MO-FR, SA-SU, MO-SA, etc.).
- Press Hour to set the ON hour.
- Press Minute to set the ON minute.
- Press TIMER again. The display will show "1 OFF".
- Press Week to select the desired day(s) for this OFF program (usually the same as the ON program).
- Press Hour to set the OFF hour.
- Press Minute to set the OFF minute.
- Repeat steps 1-8 for additional ON/OFF programs (up to 17). Press TIMER to cycle through program numbers (2 ON, 2 OFF, ..., 17 ON, 17 OFF).
- After setting all desired programs, press the Clock button to exit programming mode and return to the current time display.
To clear a specific program, navigate to the desired ON or OFF setting using the TIMER button, then press the C/R button.
5.4 Manual Control
Press the Manual button to cycle through the following modes:
- ON: The output is continuously ON, overriding all programmed settings.
- OFF: The output is continuously OFF, overriding all programmed settings.
- AUTO: The timer operates according to the programmed ON/OFF cycles. This is the standard operating mode.
Ensure the timer is in AUTO mode for automatic operation.
5.5 Resetting the Timer
To clear all settings and reset the timer to its factory defaults, locate the small reset button (often recessed) and press it using a pointed object (e.g., a pen tip). This will erase all programmed times and reset the clock.
6. Maintenance
- Cleaning: Wipe the timer's exterior with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Battery: The internal rechargeable battery is designed for long life. If the timer frequently loses its settings during power outages, the battery may need replacement. This should be performed by a qualified technician.
- Inspection: Periodically check wiring connections for tightness and signs of wear.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Timer display is blank. | No power supply; internal battery discharged. | Check power connections. Ensure power is supplied to the timer. Allow several hours for the internal battery to charge. |
| Timer does not switch ON/OFF at programmed times. | Timer is not in AUTO mode; incorrect programming; conflicting programs. | Press Manual button until "AUTO" is displayed. Review and correct programmed ON/OFF times. Ensure no programs overlap unintentionally. |
| Time or programs are lost after power outage. | Internal battery is not charged or is faulty. | Ensure the timer has been powered for at least 4 hours to charge the battery. If the issue persists, the battery may need replacement by a qualified technician. |
| Display shows "E1" or "E2" error codes. | Internal error or malfunction. | These error codes are not detailed in standard documentation. Try resetting the timer. If the error persists, contact SINOTIMER customer support for assistance. |
8. Specifications
| Model | TM616 |
| Voltage Options | AC 110V, AC 220V, DC 12V (model dependent) |
| Output Control | 30A (16A inductive) 250V AC |
| Power Consumption | < 1W |
| Programs | 17 ON/OFF settings per day or week |
| Minimum Interval | 1 minute |
| Timer Range | 1 minute to 168 hours |
| Internal Battery | 1.2V 40mA rechargeable (Ni-MH) |
| Black-out Memory | Approx. 60 days |
| Average Error | ±1 second/24 hours (at 25°C) |
| Operating Temperature | -20°C to +50°C |
| Mounting | Din Rail |
| Material | Plastic |
| Screen Size | 2 Inches |
| Item Weight | 7.4 ounces (approx. 210g) |
| Package Dimensions | 6.65 x 5.51 x 2.72 inches |
9. Warranty and Support
For warranty information and technical support, please refer to the documentation provided with your purchase or contact SINOTIMER customer service directly. Keep your purchase receipt as proof of purchase.
For further assistance, visit the SINOTIMER Store on Amazon.





