In an open display cabinet the product is kept cold by a thin stream of air rather than a glass door: cold air is blown down from a duct at the top, drawn back through a grille at the bottom and cooled again. When that stream is disturbed, the cabinet runs without a fault while the product warms.
What breaks the curtain
For open cabinets Codex says the temperature is measured in the return air, at load line level or at the warmest place. For quick frozen product the target is -18 °C, and the warmest package should not go above -12 °C.
| EN ISO 23953-2 class | Warmest M-package | Coldest M-package |
|---|---|---|
| M1 | 5 °C at most | 1 °C at least |
| M2 | 7 °C at most | 1 °C at least |
A cabinet earns its class by testing in climate class 3 (25 °C, 60 per cent relative humidity); if your shop is warmer than the test room, it may not deliver the performance on its label. If a problem shows, change one factor, such as outlet direction or stacking height, and remeasure under the same load.
A cabinet earns its class by testing in climate class 3 (25 °C, 60 per cent relative humidity); climate class 4 uses 30 °C and 55 per cent. If your shop is warmer than the test room, the cabinet may not deliver the performance on its label. If a problem shows, do not change several settings at once: change one factor, such as outlet direction or stacking height, and remeasure under the same load.
