Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of your Danfoss 077B7102 Thermostat Freezer control. Please read this manual thoroughly before installation and use to ensure proper function and to prevent damage or injury.
Safety Information
WARNING: Electrical shock hazard. Disconnect power before installation or servicing. Installation should only be performed by a qualified technician.
- Ensure all local and national electrical codes are followed.
- Do not operate the thermostat if it appears damaged.
- Keep away from water and excessive moisture.
- This device is designed for specific temperature control applications in freezers. Do not use for purposes other than its intended design.
Package Contents
Figure 1: Included components of the Danfoss 077B7102 Thermostat. This image displays the main thermostat unit with its coiled capillary tube, a black control knob, a metal mounting bracket, a circular temperature dial plate with 'Colder' indication, three gold-colored electrical spade terminals, and two small silver mounting screws.
Verify that all the following components are present in your package:
- Danfoss 077B7102 Thermostat Unit with Capillary Tube
- Control Knob
- Mounting Bracket
- Temperature Dial Plate
- Electrical Spade Terminals (3x)
- Mounting Screws (2x)
Setup and Installation
Proper installation is critical for the thermostat's performance and safety. Refer to the wiring diagram of your appliance for specific connection points.
- Disconnect Power: Before beginning any installation, ensure the power supply to the freezer or refrigeration unit is completely disconnected at the circuit breaker.
- Remove Old Thermostat: Carefully remove the existing thermostat, noting the wiring connections. It is recommended to take a photograph of the wiring before disconnection.
- Mounting: Secure the new Danfoss 077B7102 thermostat using the provided mounting bracket and screws in the designated location within the freezer. Ensure it is firmly attached.
- Capillary Tube Placement: Position the capillary tube in the area where temperature sensing is required, typically against the evaporator coil or within the freezer compartment. Ensure the tube is not kinked or damaged. The capillary tube length is 47.2 inches.
- Wiring Connections: Connect the electrical wires to the appropriate terminals on the thermostat. The thermostat has specific terminals for line input, compressor output, and potentially a defrost heater or fan, depending on the freezer model. Use the provided spade terminals for secure connections.
- Install Dial Plate and Knob: Place the temperature dial plate over the thermostat shaft, aligning it correctly. Then, push the control knob onto the shaft until it is securely seated.
- Restore Power: Once all connections are secure and the thermostat is mounted, restore power to the unit.
Operating Instructions
The Danfoss 077B7102 thermostat operates as a mechanical knob control for temperature regulation.
- Temperature Adjustment: Rotate the control knob to adjust the desired temperature setting. The dial plate indicates relative temperature settings, often from 'Warmer' to 'Colder' or numerical values.
- Cold Cut-in/Cut-out: This thermostat has a cold cut-in temperature of 0.4°F and a cold cut-out temperature of -12.1°F.
- Warm Cut-in/Cut-out: The warm cut-in temperature is 14.9°F and the warm cut-out temperature is 5°F.
- Cycle Operation: The thermostat will automatically cycle the compressor on and off to maintain the set temperature within the specified cut-in and cut-out ranges.
Maintenance
The Danfoss 077B7102 thermostat is designed for reliable operation with minimal maintenance.
- Cleaning: Periodically, gently wipe the exterior of the thermostat and control knob with a dry, soft cloth. Do not use abrasive cleaners or solvents.
- Inspection: Annually inspect the capillary tube for any signs of damage, kinks, or corrosion. Ensure electrical connections remain secure.
- Professional Service: For any internal issues or complex repairs, contact a qualified refrigeration technician.
Troubleshooting
If you experience issues with your Danfoss thermostat, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Freezer not cooling | No power to the unit; Thermostat setting too warm; Faulty thermostat; Damaged capillary tube. | Check power supply and circuit breaker; Adjust thermostat to a colder setting; Consult a technician for thermostat replacement; Inspect and replace capillary tube if damaged. |
| Freezer too cold / Freezing everything | Thermostat setting too cold; Thermostat stuck in 'on' position. | Adjust thermostat to a warmer setting; If problem persists, thermostat may need replacement by a qualified technician. |
| Thermostat not responding to knob turns | Knob not properly seated; Internal thermostat failure. | Ensure knob is pushed firmly onto the shaft; Thermostat likely needs replacement. |
Specifications
| Model Number | 077B7102 |
| Brand | Danfoss |
| Controller Type | Mechanical knob |
| Temperature Control Type | Manual |
| Cold Cut-in Temperature | 0.4°F |
| Cold Cut-out Temperature | -12.1°F |
| Warm Cut-in Temperature | 14.9°F |
| Warm Cut-out Temperature | 5°F |
| Capillary Tube Length | 47.2 inches |
| Item Weight | 0.28 Pounds (approx. 4.5 ounces) |
| Product Dimensions | 3.75 x 3.63 x 2.13 inches |
| UPC-EAN | 5702424026592 |
Warranty and Support
For warranty information and technical support, please refer to the official Danfoss website or contact their customer service directly. Keep your purchase receipt as proof of purchase.
Danfoss Official Website: www.danfoss.com
Customer Service: Refer to the contact information provided on the Danfoss website for your region.
