How does a freezer get cold?
How does a freezer get cold? Why is my cold storage unit freezing the contents?
Whether you’re managing a commercial kitchen, a medical facility, or a retail store, keeping goods properly stored at the right temperature is crucial. But what happens when your cold storage unit is freezing the contents, even when it’s not supposed to?
Let’s break down how a freezer actually works — and why things might be getting a little too cold.
❄️ How Does a Freezer Get Cold?
At its core, a freezer operates using the refrigeration cycle — a clever combination of physics and engineering. Here’s a quick overview:
- Compressor: This pumps refrigerant through the system and compresses it, raising its temperature and pressure.
- Condenser Coils: Heat from the refrigerant is released as it moves through coils, usually at the back or base of the unit.
- Expansion Valve: The refrigerant expands, dropping in pressure and temperature.
- Evaporator Coils: This is where the refrigerant absorbs heat from inside the freezer, pulling it out of the storage area and keeping things cold.
This cycle repeats constantly, keeping the internal temperature at the set point.
🧊 Why Is My Cold Storage Unit Freezing the Contents?
If your cold storage unit is meant to refrigerate, not freeze, but your contents are developing ice crystals or coming out frozen, something isn’t working as it should. Here are common causes:
1. Incorrect Thermostat Settings
Sometimes the issue is as simple as the temperature being set too low. Make sure your thermostat is calibrated to the correct level for chilled, not frozen, storage.
2. Faulty Thermostat or Sensor
A damaged or worn-out sensor can feed incorrect information to the system, causing it to overcool.
3. Poor Airflow Inside the Unit
Overfilled shelves or blocked vents can prevent cold air from circulating evenly, creating “cold spots” that freeze products near the vents.
4. Damaged Door Seals
If warm air is constantly leaking in, the freezer will overwork to compensate, sometimes overcooling areas near the evaporator coils.
5. Mechanical or Control System Fault
Faults in the defrost timer, fans, or control boards can result in uncontrolled temperature drops — leading to freezing even in a chiller unit.
🔧 What You Can Do About It
If you’re unsure what’s causing the issue, it’s best to consult a professional. At Aircon Group, we offer:
- Site surveys and diagnostics
- Repairs and servicing for cold storage units
- Preventative maintenance plans
- Custom solutions for chilled and frozen storage
✅ Keep Your Cold Storage Running Smoothly
Proper cold storage protects your stock, maintains safety standards, and reduces energy waste. Whether you’re operating a large cold room or a smaller refrigerated display unit, accuracy matters — and we can help.
📞 Contact Aircon Group today for a no-obligation site assessment or support with your cold storage systems.
