Refrigeration Thermostats: How They Work and How to Choose the Right One
What Is a Refrigeration Thermostat and Why It Matters
In commercial refrigeration equipment, the thermostat is the component that maintains a constant temperature inside the display fridge or refrigeration unit. Without a functioning, correctly calibrated thermostat, the compressor may run continuously or, conversely, start and stop erratically, leading to premature wear of the equipment and dangerous temperature fluctuations for stored products.
For owners of food stores, supermarkets, or HoReCa establishments, a faulty or poorly adjusted thermostat means more than higher electricity bills — it represents a real risk of product spoilage and significant financial losses.
How a Refrigeration Thermostat Works
The refrigeration thermostat continuously monitors the temperature inside the equipment and commands the compressor to start or stop based on the set values. In practice, it defines two thresholds:
- Minimum temperature – when reached, the compressor switches off;
- Maximum temperature – when exceeded, the compressor starts again.
The difference between the two thresholds is called the temperature differential. Too small a differential means very frequent compressor starts and stops (accelerated wear), while too large a differential means significant temperature variations inside the display fridge.
Types of Refrigeration Thermostats
There are two main categories of thermostats used in commercial refrigeration equipment:
- Mechanical thermostats (gas bulb type): operate based on the expansion of a gas or liquid within a sensor bulb. They are robust, inexpensive, and require no separate power supply, but offer lower precision (±1–2°C).
- Electronic thermostats: use an NTC or PTC sensor to measure temperature and a microprocessor for control. They offer high precision (±0.1°C), the possibility of digital programming, and a real-time visual temperature display. They are especially recommended for display fridges storing sensitive products (dairy, cold cuts, pastry products).
How to Choose the Right Thermostat for Your Refrigeration Equipment
Choosing the correct thermostat depends on several factors. Here is what you need to consider:
1. Type of Products Stored
Each category of food products has specific temperature requirements. Dairy and cold cuts require temperatures between 0°C and +4°C, wines are best kept at 8–12°C, and ice cream needs -18°C or below. Make sure the thermostat you choose covers the full temperature range required.
2. Required Control Precision
For products with strict requirements (confectionery, pastry, pharmaceuticals), an electronic thermostat with high precision is mandatory. For fruit and vegetable storage or soft drinks, a good-quality mechanical thermostat may be sufficient.
3. Compatibility with Existing Equipment
Not every thermostat is compatible with every refrigeration unit. The supply voltage, sensor type, and connection method must be compatible with the existing installation. In Modaco refrigeration equipment, thermostats are integrated and factory-tested to work optimally together with the refrigeration unit and the display fridge evaporator, eliminating the risk of incompatibilities.
4. Additional Features Useful in Commercial Environments
Modern electronic thermostats offer extra functionalities that are particularly useful for shops and HoReCa businesses:
- Audible or visual alarm when the temperature limit is exceeded;
- Programmable automatic defrost function;
- Settings memory, useful in the event of a power cut;
- Connectivity for remote monitoring.
Signs That Your Equipment's Thermostat Has a Problem
Acting quickly can prevent complete failure of the refrigeration system. Watch out for the following warning signs:
- The compressor runs continuously without stopping;
- The temperature inside the display fridge fluctuates constantly and does not stabilise;
- Excessive ice build-up on the evaporator;
- The digital display shows incorrect values or error messages.
Why the Overall Quality of Your Refrigeration Equipment Matters
A high-performance thermostat cannot compensate for poor-quality refrigeration equipment. Modaco display fridges, manufactured in Romania since 1992, are designed with high-quality components, including rigorously tested temperature control systems. Whether we are talking about display fridges for food stores, display fridges for confectioneries, or equipment for restaurants and hotels, every Modaco product is built to deliver consistent performance and durability in intensive commercial environments.
Contact Modaco for Specialist Advice
If you have questions about your refrigeration equipment's thermostat, need a spare part, or wish to purchase a new display fridge for your business, the Modaco team is here to help. We are a manufacturer with over 30 years of experience and we understand the real needs of retailers and HoReCa establishments in Romania.
Call us now on 0727.324.787 and benefit from free advice from Modaco specialists!