The situation when commercial equipment stops responding to commands often takes the owner of a bar or store by surprise. If magnetic doors are tightly locked or lost or faulty, access to the product becomes impossible. This is not just a household inconvenience, but a direct threat to business, especially during peak hours. remote control lost or defective, access to the product becomes impossible. This is not just a household inconvenience, but a direct threat to business, especially during peak hours.
Modern cooling systems use electromagnetic lockswhich keep the doors closed until a signal is given to unlock. The principle of their operation is based on the creation of a magnetic field, the strength of which can reach several hundred kilograms. Without a special control signal, breaking this connection with physical force is almost impossible and extremely dangerous for the structure.
However, there is no need to panic: there are proven methods emergency opening of bypassing the lock. In this article we will analyze in detail the technical nuances of the work magnetic latches and provide a step-by-step algorithm of actions for restoring access to the contents of the refrigerator compartment without using a standard remote control.
The principle of operation of magnetic locks in showcases
To effectively solve the problem, you need to understand the physics of the process. Unlike household refrigerators with mechanical latches, beer display cases use electromagnetic mechanism. When closed, a current passes through the coil inside the lock, creating a powerful magnetic field that attracts the counter metal bar on the door.
This process is controlled by temperature controller. It is he who supplies the voltage to open when you press a button on the remote control or control panel. If the remote control is lost, the control circuit remains open and the current continues to hold the doors in the closed position.
It is important to note that there are systems with passive magnets active solenoids. In the first case, the door is held by the force of permanent magnets, and the opening occurs due to mechanical displacement or a pulse of reverse polarity. In the second, constant power is required to hold or, conversely, to open, which depends on the logic of operation of a particular model refrigeration equipment.
⚠️ Attention: An attempt to forcefully tear off a door that is energized by an electromagnet can lead to hand injury or irreversible damage to seals and hinges. Always de-energize the system first or look for a way to remove the control signal.
Why are magnets so powerful?
Modern neodymium magnets used in industrial refrigerators have a coercivity that significantly exceeds their conventional ferrite counterparts. This allows you to create compact locks that can withstand a pull force of up to 300 kg, which guarantees tightness even during power surges.
Diagnostics of faulty remote control and controller
Before taking radical measures, you should make sure that the problem lies precisely in the absence of a remote control, and not in the banal discharge of batteries or electronics failure. Often infrared receiver on the body of the refrigerator may be dirty or covered with foreign objects.
Check the indicators on digital display. If the display is lit but does not respond to buttons, the control processor may be frozen. In such cases, briefly disconnecting the equipment from the network helps. A complete reboot of the system can reset the controller logic error.
If you have a smartphone with IR port (infrared emitter), you can try to emulate the remote control signal. This will require special applications, such as Peel Smart Remote or ZaZa Remote, where the database often contains codes for popular brands like Polair, Carboma or Ariad.
- 🔍 Check the batteries in the original remote control and the contacts in the compartment - oxidation can interrupt the circuit.
- 📱 Use the smartphone camera to check the IR radiation: when you press buttons, the LED blinking should be visible through the phone screen.
- 🔌 Perform a full reboot cycle: disconnect the refrigerator from sockets for 2-3 minutes to reset error buffer the controller.
- 📡 Make sure that there are no direct sources of bright light between the remote control and the receiver that could interfere with the IR signal.
Mechanical methods of emergency opening
If electronic methods do not produce results, have to resort to physical force. However, it is important to act delicately so as not to damage sealing rubber the geometry of the door. The first method is based on breaking the seal of the chamber.
The magnetic lock works effectively only when the doors fit tightly. If the vacuum is broken or the gap is increased by even a few millimeters, the adhesion force will drop sharply. To do this, you can use a thin plastic card or a special knife for opening locks.
Carefully insert the plastic spatula into the upper corner of the door where magnetic latchis located. Try to push it inward, breaking the plane of contact of the seal. At the same time, lightly pull the door towards you. Often a characteristic click is heard and the door opens.
⚠️ Attention: Never use metal screwdrivers or knives between the door and the body. You risk damaging evaporatorsealed in the wall, which will lead to freon leakage and costly repairs.
Another method involves using a thin fishing line or string. Pass it through the top or bottom gap (if there is one) around the magnet and make a sawing motion, trying to move the striker. This method requires skill, but is the safest for paintwork.
Electrical shutdown of the magnetic system
The most reliable way to open the refrigerator - This is a direct intervention in the electrical circuit. This will require access to the internals control controller. Typically, the control unit is located at the top or bottom of the display case, behind the decorative panel.
You will need to remove the protective cover and find the wires going to the magnetic door locks. Typically, this is a pair of wires connected to a relay or directly to the controller output. The voltage on these lines is usually 12V or 24V, less often 220V in older models.
By disconnecting these wires from the terminals, you will remove the voltage from the electromagnets and the doors will unlock. If the wires are connected through a connector, simply disconnect connector chip. If they are soldered or twisted, they must be carefully torn apart or disconnected from the terminal block.
| System type | Voltage | Disconnection method | Risk for electronics |
|---|---|---|---|
| Standard showcase | 12-24 V DC | Disconnection of terminals from relays | Low |
| Industrial cabinet | 220 V AC | Open lock power circuit | High (risk of electric shock) |
| Pulse system | 12 V DC | Reverse pulse required | Medium |
| Smart controller | 5-12 V DC | Reset via jumper | Average |
It is important to remember safety precautions. Make sure you are isolated from ground before touching any wires inside the control cabinet. Although the voltage 12V is safe, careless movement can lead to a short circuit and failure of the control board.
☑️ Safe electrical disconnection
Using alternative control devices
Many modern controllers, such as Eliwell, Evco or Dixell, have the ability to connect via USB or RS-485 interfaces. If you have a laptop and the appropriate adapter, you can try to connect to the controller logic directly.
This will require specialized software, often available on the websites of refrigeration equipment manufacturers. Through the program interface, you can force open the doors or change the operating parameters solenoid valve (solenoid valve).
It is also worth looking for hidden buttons or jumpers on the controller body. Some models allow you to enter the service menu using a key combination on the unit itself (for example, long-pressing the button SET and UP). The menu may have an item Service Modethat allows you to control peripherals.
If the refrigerator is connected to a telemetry (remote monitoring) system, access can be obtained through the web interface or mobile application if you know the administrator’s login and password. This is relevant for chain stores where management is centralized.
⚠️ Attention: Changing parameters in the service menu without knowledge can reset the factory settings for temperature and defrost cycles. Write down the initial values before any intervention in software configuration.
Prevention and installation of a backup system
To prevent the situation from recurring, it is recommended to install a mechanical backup opening system. This could be a simple key switch embedded in the magnet power circuit, which will only be accessible to personnel. This emergency release will allow you to open the doors in seconds.
It is also worth considering purchasing a universal remote control with a code learning function. By programming it once, you will protect yourself from losing the standard device. Store the (backup) remote control in a safe or with a trusted person, and not next to the main one.
Regularly check the condition of the seals and the cleanliness of the magnetic surfaces. Sticky drink residues or dirt can create additional resistance, causing even a working lock to work less well and require more effort to open.
- 🛠 Install an additional mechanical switch in an accessible location for emergency removal of power from the locks.
- 📸 Take a photo of the insides of the control unit and wiring diagram for use in future emergency situations.
- 🔋 Always keep a spare set of batteries for remote controls and a tester in the bar to check their charge.
- 📞 Keep the contacts of the equipment manufacturer's service department in quick access on your phone.
Is it possible to open a refrigerator if there is a complete loss of electricity in the building?
Yes, in most models, electromagnetic locks operate on the “normally closed” principle only when there is voltage. If the power goes out, the magnets should demagnetize and the doors will open freely. If the doors do not open when the lights are off, it means that there is a mechanical blockage in the system or a residual charge in the capacitors that needs to be discharged by closing the contacts.
Is frequent opening of doors through emergency mode dangerous for the compressor?
Opening itself does not harm the compressor, but a sudden influx of warm, humid air leads to intense vaporization and subsequent freezing of the evaporator. This forces the automation system to turn on the defrost mode more often, which reduces the life of heating elements and increases energy consumption.
Where can I find the code for a universal remote control if the original model is discontinued?
Codes can often be found in databases of universal remote controls (for example, the RM series) under the "Cold Storage" or "Showcase" section. If there is no exact model, try the auto-search method: hold down the button and point the remote control at the receiver, waiting for a reaction, then record the code found.
What to do if, after opening, the doors do not close back?
Check whether you have damaged the seal or strike plate. If the magnets are intact but do not hold, it is possible that during an emergency opening you damaged the wiring inside the door (wire break). Also make sure that there is no error on the controller that blocks the operation of the locks.