1. Installation and preparation

-Place the device on a level and sturdy ground, ensuring that there is a heat dissipation space of ≥ 50cm around it

-Connect a power supply that meets the specifications (it is recommended to configure dedicated circuits and circuit breakers)

-Allow to stand for 24 hours before initial use (after long-distance transportation)

-Clean the inner cavity and dry it with a soft cloth

### 2. Basic operating procedures

1. * * Power on * *: Connect the power and press the power switch on the control panel

2. * * Parameter Settings * *:

-Click on 'Run Settings' to enter the temperature setting interface

-Enter target temperature (e.g. -30 ℃) and holding time (e.g. 4 hours)

-Complex experiments can use 'program settings' to arrange multiple temperature curves

3. * * Start Running * *: After confirming the parameters, click the 'Start' button, and the device will automatically execute the cooling program

4. * * Sample Placement * *: After the temperature stabilizes (about 30-40 minutes), quickly place the pre prepared sample in place

5. * * Operation monitoring * *: Real time monitoring of the situation inside the box through observation windows and display screens

6. * * Test completed * *: Automatic alarm prompt, confirm that the temperature has risen to a safe range before removing the sample

### 3. routine maintenance

-Check the sealing of the door seal every week and maintain it with silicone oil if necessary

-Clean the condenser filter screen monthly (air-cooled type)

-Check whether the electrical connection terminals are loose every quarter

-Every six months, professional personnel check the refrigerant pressure and compressor status

##Other precautions

###Security Warning

1. It is strictly prohibited to place flammable, explosive, corrosive, or highly volatile items inside the box

2. * * Prohibit * * frequent opening and closing of the box door during operation to avoid affecting temperature stability and compressor life

3. * * Do not use sharp tools to scratch the surface of the inner container. Neutral cleaning agents should be used for cleaning

4. * * Special attention * *: When the temperature inside the box is below -20 ℃, direct contact with the inner wall may cause skin frostbite

###Environmental requirements

-Suggested operating temperature range: 5 ℃ to 30 ℃

-Relative humidity: ≤ 85% RH (no condensation)

-Avoid direct sunlight and strong sources of vibration

-Stay away from heat sources and corrosive gas environments

###Troubleshooting Guide

-* * Not cooling * *: Check if the power supply is normal → Confirm that the set temperature is lower than the ambient temperature → Check if the condenser is dirty or blocked

-* * Large temperature fluctuations * *: Check if the door seal is tight → if the sample is excessive → if the ambient temperature is too high

-* * Abnormal alarm * *: Record the alarm code → Refer to the corresponding chapter in the manual → Contact after-sales service