Haier DW-150W200 Operation Manual page 8

Samples storage and instructions
Only after the freezer operates stably after commissioning and making sure that internal
temperature meets storage requirements can samples be put into the freezer in batches.
The freezer must not be loaded with samples over 1/5 of its effective capacity at a time. If samples
are too hot, they should be pre-cooled down to required temperature by other equipment before being put
into the freezer. After loading the freezer with samples, set internal temperature 5 ℃ higher than the
temperature of samples, keep it running until 8 hours after normal starting/stopping, and then decrease
the temperature setting by -5~-10 ℃ ; continue such a cycle until reaching required temperature, and 12
nd
hours later put the 2
The freezer is not used for quick freezing, but for storage and preservation. Therefore, do not try to
freeze relatively hot samples, or that may result in damage to samples and the freezer. What's worse, that
may result in destroy of samples and compressor burn-out. Furthermore, it is advisable to put fewer
samples into the freezer at a time.
Note:
1. Do not put all the samples into the freezer at a time, but put 1/5 each time at an interval of
24 hours.
2. Be sure to wear special gloves in handling samples to avoid frostbite.
Preparations required by safe samples storage
For safe samples storage, the following preparations must be made to deal with emergencies such as
power supply failure and equipment damage:
1. Install a backup LN (liquid nitrogen) system.
2. Provide a LN tank (can be preserved for 3~4 hours).
Safe samples storage
1. In an emergency, immediately move the samples stored in the freezer to a safe place and keep them
well. The manufacturer shall not be liable for any sample damage resulting from the user's failure to
follow the instructions at any time.
2. Ensure that a standby super low temperature freezer or LN tank is available in the vicinity for
emergencies. The possible emergencies include equipment damage or fault due to its defects, or
equipment damage for external factors such as fire hazard, power failure, etc.
batch of samples into the freezer.
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