1. Introduction
This manual provides essential information for the safe and efficient operation of your Franklin Electric Control Box, Model 2821138110. This control box is designed for submersible motor and pump applications, specifically for 5 HP, 230V, 1-Phase systems. Please read this manual thoroughly before installation, operation, or maintenance to ensure proper function and safety.
2. Safety Information
WARNING: ELECTRIC SHOCK HAZARD. DISCONNECT POWER BEFORE OPENING.
This control box contains electrical components that can cause severe injury or death if not handled properly. Always ensure that power to the control box is disconnected at the main fuse or circuit breaker panel before performing any work on or around the box, pipes, cable, pump, or motor.
Overload protectors or switches within this box do not cut off all power lines to the pump, even if the pump stops when the switches are off. To avoid serious or fatal shock, always switch off power at the main electrical panel before working on the system.
All metal parts, including the box, pipes, cable, pump, and motor, must be properly grounded according to applicable electrical codes to prevent electrical shock.

This image displays the Franklin Electric Control Box, Model 2821138110. It features a durable grey metal enclosure suitable for indoor/outdoor use. The front panel includes a prominent blue and white Franklin Electric logo and critical safety warnings in English, French, and Spanish regarding electrical shock hazards and the importance of disconnecting power before servicing. A label at the bottom indicates the model number, HP/Volt ratings, and states that the overload must be reset for the motor to start.
3. Setup and Installation
Installation of the Franklin Electric Control Box should only be performed by a qualified electrician or pump installer in accordance with all local and national electrical codes.
Mounting:
The control box is designed for pole or wall mounting. Ensure the mounting surface is stable and can support the weight of the unit. The enclosure type is 3R, suitable for both indoor and outdoor use.
Wiring:
The control box accepts up to #2 AWG wire. All wiring connections must be secure and comply with the wiring diagram provided with the unit (not included in this manual, refer to product packaging). Proper grounding is essential for safety.
4. Operating Instructions
The Franklin Electric Control Box manages the operation of your 5 HP, 230V, 1-Phase submersible pump motor. It provides necessary starting components and overload protection.
Starting the Motor:
After proper installation and power connection, the control box will facilitate the starting of the submersible pump motor. If the motor does not start, check the power supply and ensure the overload protector has not tripped.
Overload Reset:
If the motor stops due to an overload condition, the control box's internal overload protector will trip. The label on the unit states: OVERLOAD MUST BE RESET FOR MOTOR TO START. Allow the motor to cool down before attempting to reset the overload. Consult a qualified technician if overloads trip frequently.
5. Maintenance
The Franklin Electric Control Box is designed for minimal maintenance. However, periodic inspection is recommended to ensure continued safe and reliable operation.
- Visually inspect the enclosure for any signs of damage, corrosion, or loose connections.
- Keep the exterior of the control box clean and free from debris.
- Do not attempt to open the control box or perform internal maintenance unless you are a qualified electrician and have disconnected all power sources.
6. Troubleshooting
If you experience issues with your Franklin Electric Control Box, consider the following common troubleshooting steps:
Motor Not Starting:
- Check the main power supply to the control box.
- Verify that the overload protector in the control box has not tripped. If it has, allow the motor to cool and then reset it.
- Ensure all wiring connections are secure and correct.
Frequent Overload Trips:
- This may indicate an issue with the pump motor itself, such as a worn bearing or a blockage.
- Check for proper voltage supply to the control box.
- Consult a qualified pump technician or electrician for diagnosis and repair.
For complex issues or if troubleshooting steps do not resolve the problem, contact a qualified professional.
7. Specifications
| Item | Motor and Pump Control Box |
| Model Number | 2821138110 |
| Motor/Pump HP | 5 HP |
| Phase | 1 Phase |
| Voltage | 230V |
| Amps | 27.5 Amps |
| Control Box Type | CSCR |
| Enclosure Type | 3R (Indoor/Outdoor Use) |
| Mounting | Pole or Wall |
| Wire Acceptance | Up to #2 AWG Wire |
| Height | 9 5/16 inches |
| Width | 8 inches |
| Depth | 5 13/16 inches |
| Product Dimensions | 11.2 x 8.3 x 6.2 inches; 0.16 ounces |
| Manufacturer | FRANKLIN |
8. Warranty and Support
For warranty information or technical support regarding your Franklin Electric Control Box, please refer to the documentation included with your purchase or visit the official Franklin Electric website. You may also contact their customer service department for assistance.





