Capacity
It is the total working capacity of the freezer. A larger capacity allows you to accommodate more products but affects the dimensions and cost of the unit. Therefore, when choosing according to this parameter, you should not chase after the maximum capacity but the capacity you really need. For example, the average required capacity is 50 litres per person. And when choosing a display chest freezer (see "Product type"), you need to take into account the number of products offered for sale.
It is also worth considering that the freezer is often divided into several compartments (see below) - which means that a large capacity does not guarantee that large pieces of food can fit in the device.
No Frost
No Frost system inside the freezer. A special fan provides air circulation, while moisture condenses in the frost, not in the working chamber, but in a special compartment. Periodically, the fan turns off, the frost melts, and the meltwater flows into a special tray, from which it evaporates. Such a system eliminates the need to defrost the freezer to remove frost periodically. On the other hand, it imposes special requirements on the packaging of products, since in such freezers the products dehydrate fast.
Max. temperature
The highest temperature maintained by the freezer during normal operation. This parameter is not as important as the minimum freezing temperature, however, it allows to evaluate the optimal conditions for storing certain categories of products that do not need deep freezing. And in some cases, it shows that the freezer can
work as a refrigerator.
Minimum temperature
The lowest temperature that the freezer can maintain in normal operation. First of all, the duration of food storage in the freezer depends on this parameter: it is believed that a temperature of -12 ° C is enough to preserve food for a month, -18 ° C – 3 months, -24 ° C – up to a year. At the same time, it must be taken into account that not only temperature affects the shelf life but also the type of product and its quality before freezing.
Power failure autonomy
The amount of time the freezer keeps food cold enough when the refrigeration system is turned off, for example, due to a breakdown or power outage. Technically, the power failure autonomy for each model is calculated differently; For example, for a freezer with an operating temperature of -18 ° C, this is the period during which the products in the chamber heat up from -18 ° C to -9 ° C. To sum up, the time is indicated during which the frozen products are guaranteed not to heat up to a temperature at which they could lose their properties.
Freeze capacity
One of the main indicators of freezer performance is the approximate amount of fresh food that the freezer can completely freeze from room temperature to the minimum operating temperature in 24 hours. For domestic use, a power of 10-15 kg/day is considered quite sufficient. More performant models may be required if you have to freeze a lot of food at a time or for industrial purposes.
Controls
The type of control provided in the freezer. This parameter is specified by the type of controls and their location.
- Rotary knobs. In general, this is the simplest and most inexpensive option used in units of the appropriate level. However, even this is quite enough - especially if the freezer works in more or less constant temperature conditions (for example, in a home or office kitchen). In many cases, the matter is limited to selecting the appropriate knob position once and then not changing the settings. In addition, the major advantages of this type of control are reliability and ease of repair.
- Push-buttons. Push-buttons are considered more advanced than rotary knobs. The specific functionality of freezers with such a control may be different. But among them, models with additional functions and the ability to fine-tune the temperature are noticeably more common. As for the location, there are internal and external push-buttons. The internal location allows you to hide the control panel behind the refrigerator door, providing a neat appearance with a minimum of protruding parts.
The external location is convenient because you do not need to open the door to access the settings. On the other hand, the real need for such an arrangement is not so often, and the control panel must also fit into the overall design of the unit (which is not always possible to do in the best way).
- Touch controls. Touch controls are considered th...e next step in the development of control panels, after buttons. So, it looks stylish and technologically advanced, they do not need to be pressed hard (just touched), and there are no protruding parts, corners or slots on the surface of the panel, which simplifies cleaning from dirt. The presence of a touch panel is typical mainly for models of the middle and top levels. It costs a little more than a push-button one, but this is imperceptible against the total price of the units. But the internal location, in this case, is much less common than the external one. It is because there is no need to hide the touch panel behind the door. It can easily fit into the design of the device. In addition, external placement allows you not to open the door again to access the settings.
Display
The external display makes the operation of the freezer more intuitive and allows you to control the conditions inside without opening it. The display can show data on the temperature inside the chamber or individual drawers, running programmes and the state of their running(fast freeze, for example), etc.
Cold accumulators
The presence of removable refrigerants (cold accumulators) in the freezer design. This solution allows you to extend the temperature retention time in case of a power outage and also allows you to take it with you for use outside the freezer if necessary.
