2. Before the cold storage is installed, check the quantity of cold storage board according to the delivery list. When loading and unloading the library board, handle it with care, and spread a scratch-proof layer at the joint between each layer of the library board and the ground.
3. When the cold storage is assembled as a whole, there should be a gap between the wall and the roof, the ground or the bottom pat must be flat, and the construction environment should be clean.
4. Before the storehouse is fixed with angle aluminum, it should be sealed with glass glue first, and then fixed with angle aluminum by solid pulling method. The distance between rivets is 300mm. The distance between the upper and lower sides of the doorway is100 mm.
Technical requirements for installation of air cooler:
1. When selecting the lifting point position, the best position of air circulation should be considered first. Secondly, consider the structural direction of the library.
2. The gap between the air cooler and the storage board is greater than the thickness of the air cooler.
3. All hanging bolts of the air cooler shall be tightened. Seal bolts and suspension bolts with sealant to prevent cold bridge and air leakage.
4. When the ceiling fan is overweight, 4-angle or 5-angle iron beams should be used. The lintel should span to another roof and wallboard to reduce the load.
Installation requirements of refrigeration unit:
1, semi-enclosed or fully enclosed compressors should be equipped with oil separators, and appropriate amount of engine oil should be added to the oil. When the evaporation temperature is lower than-15℃, a gas-liquid separator and an appropriate amount of refrigeration oil should be added.
2. The compressor base should be equipped with a damping rubber seat.
3, the installation of the unit should leave room for maintenance, easy to observe the adjustment of instruments and valves.
4. The high pressure meter should be installed on the tee of the liquid storage filling valve.
5. The overall layout of the unit is reasonable and the colors are consistent. The installation structure of all types of units should be consistent.
Installation requirements of refrigeration pipeline:
1, the diameter of copper pipe should be strictly selected according to the diameter of the interface of compressor suction and exhaust valve. When the distance between the condenser and the compressor is more than 3 meters, the pipe diameter should be increased.
2. The suction surface of the condenser shall be kept at a distance of more than 400mm from the wall, and the air outlet shall be kept at a distance of more than 3 meters from the obstacle.
3. The diameter of the inlet and outlet of the liquid storage tank shall be subject to the diameter of the exhaust port and liquid outlet marked on the unit sample.
4. The suction pipeline of the compressor and the return pipeline of the air cooler shall not be less than the size indicated in the sample, so as to reduce the internal resistance of the evaporation pipeline.
5. When making the regulating station, each outlet pipe should be sawed into a 45-degree oblique angle and inserted into the bottom, and the inlet pipe should be inserted into a quarter of the pipe diameter of the regulating station.
6. The exhaust pipe and return pipe should have a certain slope. When the condenser is higher than the compressor, the exhaust pipe should be inclined to the condenser and a liquid ring should be installed at the outlet of the compressor. Prevent gas from cooling, liquefying and flowing back to the high-pressure exhaust port after shutdown, resulting in liquid compression when the machine is restarted.
7. A U-bend pipe should be installed at the outlet of the air cooler return pipe. The oil return pipeline should be inclined to the compressor to ensure smooth oil return.
8. The expansion valve should be installed as close as possible to the air cooler. The solenoid valve should be installed horizontally, and the valve body should be vertical. Pay attention to the liquid outlet direction.
9. If necessary, install a filter on the compressor return pipe to prevent the dust in the system from entering the compressor and remove the moisture in the system.
10. Before fastening, all sodium nuts and locking nuts of the refrigeration system should be lubricated with refrigeration oil to enhance the sealing performance. Wipe clean after fastening. The packaging of every door should be locked.
1 1. The temperature sensing package of the expansion valve is fastened at the evaporator outlet 100 mm to 200 mm with a metal card and tightly wrapped with double insulation.
12, after installation, the refrigeration system should be overall beautiful and have the same color. There should be no height difference in pipeline crossing.
13, when welding refrigeration pipeline, there should be a sewage outlet, and nitrogen is used to blow sewage from high and low pressure sections. After the segmented sewage discharge is completed, the whole system will discharge sewage until there is no dirt, and the sewage discharge pressure is 0.8MPa.
14. After the welding of the whole system is completed, conduct an air tightness test. Fill the high-pressure end with nitrogen 1.8MP, and the low-pressure end with nitrogen1.2mp. When pressurizing, use soapy water to detect leakage, carefully check all welded joints, flanges and valves, and keep the pressure for 24 hours after simple completion.
Installation requirements of power distribution system:
1. Install the wire number for each maintenance contact. 2. Make the electric control box in strict accordance with the requirements of the drawings, and conduct no-load experiment with electricity. 3. Indicate the name on each contactor.
4. Fix the wires of all electrical components with binding wires.
5, electrical contact pressure wire connector, motor main line connector, the application of wire clamping, hanging tin when necessary.
6, equipment connection to laying line pipe, and fixed with clips, PVC line pipe connection with glue, nozzle with tape.
7. The distribution box should be installed horizontally and vertically, with good ambient lighting and a dry room for easy observation and operation.
8. The area occupied by wires in online pipelines shall not exceed 50%.
9, the selection of wire should have a safety factor, the unit operation or defrosting wire surface temperature shall not exceed 40 degrees.
10, the circuit system must be 5-wire, and if there is no ground wire, the ground wire must be installed.
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12, catheter installation should be beautiful and firm.
Technical requirements for fluorination and commissioning of refrigeration system;
1, measure the supply voltage.
2. Measure the resistance values of the three windings of the compressor and the insulation of the motor.
3. Check the opening and closing of valves in the refrigeration system.
4. After emptying, inject the refrigerant into the reservoir to 70%-80% of the standard filling amount, and then run the compressor until the low-pressure gas fills the reservoir.
5. After starting, listen to the compressor first to see if the condenser and air cooler are working normally. Is the three-phase current of the compressor stable?
6. After cooling is stable, check all parts of the refrigeration system, including exhaust pressure, suction pressure, exhaust temperature, suction temperature, motor temperature, crankcase temperature and temperature before expansion valve, observe the frosting of evaporator and expansion valve, and observe the oil level and color change of oil mirror. Whether the sound of equipment operation is abnormal.
7. Set the parameters in the computer and the opening of the expansion valve according to the frosting situation and the usage of the cold storage.
8. Wipe the whole equipment clean and clean the environment.