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Safety Precautions
Please read all the installation and operation instructions carefully, and strictly follow them when
installing and operating, otherwise the user shall be solely liable for any resultant damages (including
part damage).
Precautions for installation location
1. Installation site of the equipment should ensure a well-ventilated circumstance, avoid direct
sunlight.
2. The freezer must not be installed close to heat sources and no heater is permitted to close it.
3. The freezer must not be installed in an enclosed or narrow space.
4. The room temperature should be kept below 25
℃ (if above 30℃, the refrigeration efficiency would
lower rapidly and the compressor would be damaged easily).
5. To be installed, the freezer should be kept at least 30cm away from any wall.
6. The site where the freezer is used must be provided with a special air switch with leakage protector of
proper specification (3-phase 16A, single-phase 25A); the wiring must be in the form of crimp
connection and any socket/plug is strictly forbidden to use for connection.
7. In case of frequent occurrence of unstable voltage or below rated voltage, a voltage stabilizer should
be installed.
Precautions for operation
1. After its installation or handling, the freezer must be left still at least 24 hours before being energized.
2. The freezer must operate at initial temperature setting (-126
℃) for over 24 hours.
3. After the freezer operates for 24 hours stably at initial temperature setting, set the operating
temperature at -135
℃ and have the freezer stably operate at this temperature for at least 7 hours.
4. If the freezer works normally at the second temperature setting, set target operating temperature.
5. Normal range of internal temperature: -126
℃ to -150℃.
6. Set alarm temperature as required (recommended alarm temperature: operating temperature plus
15
℃~25℃).
Both refrigerant and foaming agent used by the freezer are flammable and explosive substances.
Therefore, be sure that the site where the freezer is used is well ventilated and fire fighting equipment is
provided near the installation location.
Do not put too many or too hot samples into the freezer at a time, otherwise result in the increase of
system load, prolonged running of the freezer and further burn-out of compressor. It is advisable to put