Introduction
This manual provides essential information for the safe and efficient operation, installation, and maintenance of your Atosa MGF8405 Undercounter Freezer. Please read these instructions thoroughly before installation and use to ensure proper function and to prevent damage to the unit or injury to personnel. Keep this manual for future reference.
Important Safety Information
Always follow basic safety precautions when using this appliance to reduce the risk of fire, electric shock, or injury.
- Ensure the unit is properly grounded.
- Do not store explosive substances such as aerosol cans with a flammable propellant in this appliance.
- Keep ventilation openings clear of obstruction.
- Do not use mechanical devices or other means to accelerate the defrosting process, other than those recommended by the manufacturer.
- Do not damage the refrigerant circuit.
- Only qualified service personnel should perform repairs.
Setup
1. Unpacking
Carefully remove all packaging materials, including tape and protective film. Inspect the unit for any shipping damage. Report any damage immediately to the carrier and your dealer.
2. Placement
Place the freezer on a strong, level surface capable of supporting its weight when fully loaded. Ensure adequate ventilation around the unit. Maintain a minimum of 6 inches (15 cm) clearance from walls and other appliances for proper airflow and condenser operation.

Image: The Atosa MGF8405 Undercounter Freezer with its door open, revealing the interior shelf and stainless steel construction. The unit is on casters.
3. Caster Installation/Locking
Your Atosa MGF8405 comes with pre-installed casters for easy mobility. Once the unit is in its desired location, engage the locks on the front casters to prevent accidental movement.

Image: A close-up view of one of the durable caster wheels, which allows for easy positioning of the freezer.
4. Power Connection
Connect the freezer to a dedicated 115 Volt, 60 Hz, single-phase electrical outlet. Do not use extension cords or adapter plugs. Ensure the electrical supply matches the requirements specified on the unit's data plate.
5. Initial Cleaning
Before first use, clean the interior and exterior surfaces with a mild soap and warm water solution. Rinse thoroughly and dry with a soft cloth.
6. Initial Startup
After cleaning, plug in the unit. Allow the freezer to operate empty for at least 2-4 hours to reach its set temperature before loading with products.
Operating Instructions
1. Temperature Control
The Atosa MGF8405 features an electronic temperature controller. The factory preset temperature range is between -8°F and 0°F (-22°C and -18°C). To adjust the temperature, refer to the specific instructions for the digital controller model, typically involving pressing a 'SET' button and using arrow keys.

Image: A detailed view of the electronic temperature controller, displaying the current temperature settings.
2. Loading the Freezer
Distribute products evenly on the pre-installed shelf. Do not block the internal air circulation fan or vents, as this can impair cooling efficiency. Avoid overloading the unit.

Image: The interior of the freezer, highlighting the fan for air circulation and the adjustable wire shelf.
3. Door Features
- Self-Closing Door: The door is designed to self-close to maintain internal temperature and energy efficiency.
- Stay-Open Feature: For convenience during loading or unloading, the door can be opened past a certain angle to remain open.
- Magnetic Door Gasket: The magnetic gasket ensures a positive seal, preventing cold air from escaping.
Maintenance
Regular maintenance is crucial for the longevity and efficient operation of your freezer. Always unplug the unit before performing any maintenance.
1. Cleaning
- Interior: Clean the interior regularly with a mild, non-abrasive cleaner and warm water. Rinse and dry thoroughly.
- Exterior: Wipe down the stainless steel exterior with a soft cloth and a stainless steel cleaner. Avoid abrasive pads or cleaners that can scratch the surface.
- Condenser Coil: The condenser coil should be cleaned every 30 days or as needed. Dust and debris accumulation can reduce efficiency and increase energy consumption. Use a stiff brush or vacuum cleaner to remove dust from the condenser fins.

Image: The rear of the freezer, displaying the condenser coils and fan, which require regular cleaning for optimal performance.
2. Defrosting
This unit features an automatic defrost system. However, if excessive ice buildup occurs, manually defrost the unit by unplugging it and allowing the ice to melt. Remove all products before manual defrosting. Do not use sharp objects to remove ice.
3. Gasket Care
Inspect door gaskets regularly for cracks or tears. Clean gaskets with warm water and mild soap. A damaged gasket can lead to poor sealing and increased energy consumption. Replace worn gaskets promptly.
Troubleshooting
Before contacting service, review the following common issues and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Freezer not cooling | Unit unplugged; circuit breaker tripped; temperature set too high; condenser coil dirty; door not sealing properly. | Check power connection; reset breaker; adjust temperature setting; clean condenser coil; inspect and clean door gasket. |
| Excessive noise | Unit not level; loose parts; fan motor issue. | Level the unit; check for loose components; contact service if fan noise persists. |
| Ice buildup | Door left open; faulty door gasket; excessive humidity. | Ensure door is closed properly; replace faulty gasket; reduce humidity in the environment. |
| Water on floor | Drain pan overflowing; clogged drain line. | Check and empty drain pan; clear any obstructions in the drain line. |
Specifications
| Feature | Detail |
|---|---|
| Model | MGF8405 |
| Brand | Atosa |
| Installation Type | Undercounter |
| Exterior Material | Stainless Steel |
| Interior Material | Stainless Steel |
| Refrigerant | R290 (Environmentally Friendly) |
| Temperature Range | -8°F to 0°F (-22°C to -18°C) |
| Voltage | 115 Volts |
| Door Features | Self-closing, Stay-open, Magnetic Gasket |
| Shelving | One pre-installed shelf per section |
| Mobility | Pre-installed casters |

Image: The Energy Star label, indicating the freezer meets energy efficiency guidelines.
Warranty Information
The Atosa MGF8405 Undercounter Freezer comes with the following warranty:
- 2-Year Parts and Labor Warranty: Covers defects in materials and workmanship for two years from the date of purchase.
- 5-Year Compressor Warranty: Covers the compressor for five years from the date of purchase.
Please retain your proof of purchase for warranty claims. For full warranty terms and conditions, refer to the official warranty document included with your product or contact Atosa customer service.
Customer Support
If you have questions, require technical assistance, or need to schedule service, please contact Atosa customer support. Have your model number (MGF8405) and serial number ready when you call.
Atosa Customer Service:
- Contact information (phone number, email, or website) typically found on the manufacturer's website or product documentation.







