Clean of Ultra-low Temperature Freezer

Cleaningmachineshell: Semi-annual First wipe the machine shell from top to bottom with soapy water or disinfectant commonly used in the laboratory, then wipe it thoroughly with clean water, and dry it with a soft dry cloth. Cautions: Avoid using too much water to clean the control board area, in order to prevent leakage damage of circuit components. 

Cleanenvironment of ultra-lowtemperature freezer: Once a month Clean up all ground debris and dust with sanitary ware, reduce dust adsorption in compressor and refrigeration system, affect heat dissipation Prevent dust from adsorbing on circuit board, causing circuit components to be damaged by interference Sealing test of door seals: Once every six months, poor sealing will increase the working time of compressor and cause compressor failure. Open the door, then put in a sheet of A4 paper, close the door, pull A4 paper out, if it is difficult to pull, it shows good sealing. It needs to be tested all around the door seal. 

Clean air filter: Clean at least 4 times a year Grasp the button at the bottom left corner and open the door directly below the cryogenic freezer. Remove the black air filter and wash it with water or neutral detergent. After drying, place the filter in place. If it's already dirty, the dust and debris on it can't be removed, and a new filter needs to be replaced. Clean condenser: at least twice a year Refrigerator radiates heat to the outside environment through condenser. 

Ash accumulation in condenser and filter will cause heat dissipation obstruction and decrease refrigeration efficiency of refrigerator. 

1. Grasp the button at the bottom left corner and open the door directly below the refrigerator. 

2. Use a vacuum cleaner to clean the dust on the condenser, or use compressed air to blow off the dust adsorbed on the condenser, or brush off the dust with a fine brush. Notes: According to the environmental conditions of different laboratories, it is necessary to clean the condenser several times a year. And in the cleaning process, do not damage the radiator on the condenser. Intracavity defrosting: once a year or when the thickness of defrosting exceeds 10 mm High humidity, frequent door opening can easily lead to frost inside the door. Excessive frost, ice will affect the performance of refrigerators, can be deicing shovel and vacuum cleaner deicing. 1. Transfer samples from all chambers to another cryogenic refrigerator 2. Turn off the battery switch, the main power switch, and pull out the power cord. 

3. Open all the inner doors and let the ice melt and wipe it off with a soft rag. 

4. When the frost is removed, the inner cavity needs to be thoroughly cleaned with hot water or detergent (soda water) without chloride and wiped with a dry cloth. 

5. Re-insert the power cord and turn on the main power switch and battery switch. 

6. Samples can be placed after the refrigerator runs empty overnight. 

We are a ultra low temperature freezer manufacturer. Welcome to choose our products.

Web：https://www.lneya.com
Mail：sales@cnzlj.com
Tel：+86-13912479193

Analysis of the causes of noise generated by the operation of low temperature chillers

Noise is common in the operation of industrial equipment. There are many reasons for noise, which may be caused by some environmental problems in the installation. When noise is generated, we must first confirm the cause and whether it is an internal component. The problem is raised because if a problem occurs and the replacement or repair is not stopped in time, the low temperature chiller will not work properly.

The environment and location of the device can cause noise problems, and if it is in a relatively small environment, the noise will be "amplified". A smaller environment will make the normal operation sound louder and will sound out of normal operation. It is recommended that both air-cooled and water-cooled units be installed in a relatively open environment with no foreign objects around them. If the requirements are higher, the soundproof wall can be installed and ventilation and heat dissipation can be observed.

There is no flatness processing under the device position, which will result in displacement during normal operation, as well as vibration and shaking during normal operation. Under displacement conditions, the amplitude of the vibration will increase and a large amount of noise will be generated.
                       

Due to the operational noise caused by the low temperature chiller itself, air coolers and water coolers are more prone to "noise" than the latter due to structural differences. It is well known that air-cooled chillers are cooled by a fan for the condenser, while the water cooler is cooled by a cold water tower system for the condenser. Compared to the noise of the cold water tower (usually placed at a high position, it is different from the position of the water cooler). The fan is noisy and integrated with the chiller main unit, so it is easier to feel the noise (can remove the blades or fill the bearings with smooth oil).

In addition, the compressor of a low temperature chiller is one of the sources of noise. The selected compressor can have low noise characteristics and the chiller noise must be low. Otherwise, the overall chiller will be noisy.

In addition to the noise figures of the chillers used in low-temperature chillers, whether it can be operated continuously for a long time, whether to add appropriate smooth oil, whether it can be regularly maintained, and whether the service life is too long is the key to balancing the noise elements of low-temperature chillers. Where. In addition, there are pumps for both air and water cooling. If the pump is running too loud, it may need to be cleaned.

Then, as an important part of the low temperature chillers, in order to reduce losses and generate noise, we should always maintain to extend its service life and improve operational efficiency:

1. Check if the oil level of the fuselage and oiler is normal.
2. Check the movement flexibility of the oiler and the amount of oil injected
3. Check the oil leakage, water leakage and air leakage of the compactor and take corresponding measures to remove it.
4. Check that each valve is open.
5. Check that the vibration of the machine is normal. Otherwise, it is necessary to stop the inspection and scanning.
6. Check that the value of each meter is normal.
7. Check the smooth oil process (fine) filter and replace the fine filter according to the conditions. Stop cleaning the strainer.

If you have any knowledge of the use, maintenance, equipment prices, etc. of cryogenic chillers, please contact LNEYA and discuss: sales@cnzlj.com/LNEYA.COM.

Analysis of Advantages and Disadvantages of Screw Water Chiller

Compared with other types of chillers, the overall energy consumption of high-quality screw water chiller is relatively small. Because the production technology of screw water chiller is more advanced and less energy is used, the equipment can quickly realize the purpose of reducing space temperature. The more screw water chillers are used in enterprises, the stronger the ability to reduce space temperature per unit time is, thus providing conditions for enterprises to reduce energy consumption costs. The longer the enterprises use screw water chillers, the less energy they consume as a whole.

Because screw water chillers are designed and manufactured with advanced production technology, the overall failure rate is low. Even if the screw water chiller is used uninterruptedly for a long time, the screw water chiller will not have more faults. The fewer faults the screw chiller produces, the higher the safety factor of the enterprise using the screw water chiller, so as to provide technical guarantee for prolonging the service life of the equipment.

Although the cooling performance of screw water chiller is very high, there are still many potential safety hazards when using screw water chillers. Because screw water chillers use more accessories, if a single component fails, it will threaten the normal operation of the equipment, and even lead to irreparable failure of the equipment. When enterprises use screw water chillers, they must be carefully tested to prevent all kinds of faults, so as to ensure that the long-term uninterrupted operation of screw chillers will not have any faults.

How to prevent malfunction? If the screw water chiller fails many times, it will threaten the safety of the equipment. Before using the screw water chiller, it is necessary to carry out a comprehensive inspection of the equipment regularly, which can detect and deal with all kinds of faults in time, so as to prolong the service life of the equipment and help enterprises reduce the space temperature in the shortest time.

Cryogenic Refrigeration System -150℃～-20℃

Overview:

• Microcomputer control, cascade temperature controller, digital temperature display, the regulation of unit 0.1℃, inside the temperature range -20 ℃ ~ -125 ℃ adjustable,operation of cryogenic refrigeration system.
• Multi-safety protection, more reliable operation.
• France TECUMSEH compressor, Germany DANFOSS compressor, EMERSON compressor, automatic cascade refrigeration technology.
• With self-diagnosis function, freezer overload protection, high-pressure switches, overload relays, thermal protection device and other security functions, and fully guarantee the use of safety.
• Three sealed mold layer of insulation, Extra-thick high-density polyurethane foam insulation layer, the effect of good insulation; Inline vacuum insulation panels.
• Human design, more convenient and flexible.
• Suitable for mechanical producing plant use.

Model	GY-A228N	GY-A250N	GY-A2A10N	GY-A350N	GY-A3A10N	GY-A550N	GY-A5A10N
Volume	280L	500L	1000L	500L	1000L	500L	1000L
Inner dimension	800*600*600	1200*650*650	1550*800*750	1200*650*650	1550*800*750	1200*650*650	1550*800*750
Type	（Vertical）
Capability carrying	150KG	220KG	300KG	220KG	300KG	220KG	300KG
	Designed bearing capacity is two times of the standard one, (refrigeration system is designed according to the standard capacity when target artifact weight is greater than the standard capacity, the cooling rate will decrease)
Temp. range	-120℃～20℃	-120℃～20℃	-120℃～20℃	-135℃～0℃	-135℃～0℃	-150℃～0℃	-150℃～0℃
Cooling capacity	0.7kw -110℃	1 kw -110℃	2 kw -110℃	1kw -125℃	2 kw -125℃	1 kw -140℃	2kw -140℃
Temp. accuracy	±2℃	±2℃	±2℃	±2℃	±2℃	±2℃	±2℃
Heating power	2kw	3kw	5kw	3kw	5kw	3kw	5kw
	Nickel-chromium alloy electric heating heater, the controller has double safety protection, with independent temperature limiter protection.
Cooling rate	Ambient temperature of 25℃, no-load,（from 0℃to -110℃ about 1 .5 hour；
	from 0℃ to -140℃ about 2 hours, cooling rate will be a little different for ambient temperature changes.
Controller	ASET multifunctional controller
Operation panel	7-inch color touch screen, display set temperature, measured temperature.
Temp. record	Temperature curve and fault record, U-disk data export, excel format.
Inside circulating air	2100 m³/h	2750 m³/h	4500 m³/h	2750 m³/h	4500 m³/h	2750 m³/h	4500 m³/h
	When it is open, the internal circulation fan automatically turns off. The touch screen displays open state.
Compressor	Emerson Copeland, adopt cascade refrigeration technology
Intermediate heat exchanger	KAORI Plate heat exchanger
Dry filter	Emerson
Expansion valve	Electronic expansion valve
Evaporator	Copper-tube with aluminum-fin
Cooling Type	Air-cooled with water-cooled auxiliary functions (Ensure good cooling capacity when temp. above 30℃)
Means of insulation	Polyurethane foam insulation, thermal insulation layer 150 mm, with embedded FIR boards
Safety Protection	Self-diagnosis function; Phase sequence phase failure protection; leakage protector; cooling unit overload protection; high and low-pressure switch, overload relay, thermal protection, high-temperature protection and temperature fault protection.
Case material	Outside is cold rolled steel painting, internal is SUS304 wire drawing board.
Refrigerant	Mix Refrigerant from LNEYA
Dimension	2200*1150 *1150	2700*1200 *1200	3100*1300 *1250	2900*1200 *1200	3200*1300 *1250	3000*1200 *1200	3300*1300 *1250
Power 380V 50HZ	12KW MAX	16.5KW MAX	20KW MAX	18KW MAX	25KW MAX	23KW MAX	30KW MAX
Weight	570kg	680kg	850kg	750kg	900kg	800kg	980kg
Optional	High temperature reaches 80℃ and temperature accuracy is ±0.5℃；the input power will be changed.
Optional	Temp. accuracy ±0.5℃
Optional	Cooling and heating program controlled, meet cold treatment process requirements(can set 5 programs, each  program can edit 45 steps.)
Optional	Interior door, reduce cooling capacity lost when picking small workpieces (temperature below 60℃ optional)
Optional	Outside SUS304 wire drawing board case
Optional	Diameter 50mm cable hole
Optional	Electric heating vacuum glass observation window (with lighting) 200mm*300mm
Optional	Low temperature automatic defrost (can be once per hour or use manual button to defrost), ensure it can work at low temperature for a long time even the door is open and close frequently）

If the low temperature refrigeration system has been frosted, believing that some enterprises have met, then how should we deal with such situation? Are there any methods can solve this problem. Today, let's know something about it with Guanya refrigeration company.

1. First turn off the suction valve of the low temperature box compressor and unload to the minimum number of cylinders to operate.

2. Then close the liquid supply valve of the intermediate cooler and close the suction valve of the small high pressure cylinder.

3. After the high pressure cylinder is returned to normal, open the suction valve of the large and low pressure cylinder again. When  the normal operation has been resumed, then supply the liquid to the intermediate cooler.

4. If the frosting of high pressure cylinder is severe, the operation of the unit must be stopped.

5. Drain the intermediate cooler.

6. The cooling water treatment is the same as the single-stage treatment.

Do you remember the above way of processing? If you still have some questions, please contact the customer service on the official website of Guanya refrigeration company immediately, and solve the problem in time!

Contact Lneya for more.