2, before the installation of cold storage, according to the delivery note to check the number of cold storage library board. When loading and unloading the boards, make sure that the boards are gently held and put down, and the anti-scratch layer is spread on each layer of the boards and the ground joints.
3. When the whole cold storage is assembled, there should be a gap with the wall and the roof, the ground or the bottom shot must be level, and the construction environment should be clean.
4, the interior of the library body with angle aluminum fixed before the application of glass glue sealing, in the corner of aluminum against the solid pull rivets fixed. Pull rivets spacing 300 mm. The spacing between the upper and lower sides of the doorway is 100 mm.
Technical requirements for the installation of chillers:
1, when choosing the location of the hanging point, first consider the location of the best air circulation. Secondly, the direction of the structure of the library body is considered.
2, the gap between the chiller and the library board should be greater than the thickness of the chiller.
3. All hanging bolts of the chiller should be fastened. And use sealant to close the bolts and hanging bolt perforations to prevent cold bridge and air leakage.
4, ceiling fan is too heavy, should be No. 4 angle or No. 5 angle iron for over-beam. The over-beam should be spanned to another piece of roof and wall panels to reduce the load-bearing.
Refrigeration unit installation requirements:
1, semi-sealed or hermetic compressor should be installed with an oil separator, and in the oil portion of the oil with the appropriate amount of oil, the evaporating temperature is lower than -15 degrees Celsius, it should be added to the gas-liquid separator and the appropriate amount of freezer oil.
2, the compressor base should be installed shock absorbing rubber seat.
3, the installation of the unit should leave space for maintenance, easy to observe the adjustment of the meter and valve.
4, high pressure meter should be installed in the liquid storage irrigation valve tee.
5, the overall layout of the unit is reasonable, consistent color. The installation structure of each model unit should be consistent.
Refrigeration piping installation requirements:
1, the selection of copper pipe diameter should be strictly in accordance with the compressor suction and discharge valve interface selection of pipe diameter. When the condenser and compressor separation of more than 3 meters should increase the diameter of the pipeline.
2, the condenser suction surface and the wall to maintain a distance of more than 400mm, the air outlet and obstacles to maintain a distance of more than 3 meters.
3, the liquid storage tank pipe diameter import and export pipe diameter according to the set of samples marked on the exhaust and liquid pipe diameter shall prevail.
4, compressor suction line and chiller return line shall not be smaller than the sample size to reduce the internal resistance of the evaporation line.
5, regulating the production of the station, each liquid outlet pipe should be sawed into a 45-degree beveled, inserted into the bottom, into the liquid pipe into the regulating station at one-fourth of the diameter of the pipe.
6, the exhaust pipe and the return pipe should have a certain slope, the condenser position is higher than the compressor, the exhaust pipe should be sloped to the condenser and the compressor exhaust port at the addition of liquid ring. Prevent the gas cooling liquefaction after the shutdown back to the high-pressure exhaust port, and then start the machine caused by liquid compression.
7, chiller back to the gas pipe should be installed at the exit of the U-bend. Return air pipeline should be sloped to the direction of the compressor to ensure smooth oil return.
8, expansion valve should be installed as close as possible to the position of the chiller. The solenoid valve should be installed horizontally and the valve body vertically and pay attention to the direction of liquid discharge.
9. If necessary, install a filter on the compressor return line to prevent dirt from entering the compressor and remove water from the system.
10. Refrigeration system, all sodium and lock mother before fastening, to wipe the refrigeration oil lubrication, strengthen the seal. Wipe clean after fastening. Each cut-off door coil to lock.
11. Expansion valve temperature-sensitive package with a metal card fastened in the evaporator outlet 100mm-200mm, with double insulation wrapped tight.
12, refrigeration system installation is completed, to the overall beauty, color consistency. There should be no pipeline cross high and low phenomena.
13, refrigeration pipeline welding to leave a drain from the high and low pressure with nitrogen blowing for segmented blowing, segmented blowing after the completion of the whole system blowing until there is no dirt as a pass, blowing pressure with 0.8MPa.
14, in the whole system after welding, to carry out airtightness test, high-pressure end of the nitrogen 1.8MP. low-pressure end of the nitrogen 1.2MP. in the charging period with soapy water for leakage detection, careful inspection of the welded joints, flanges and valves, simple and ugly completion of the pressure 24 hours without dropping pressure.
Distribution system installation requirements:
1, each point of contact with the installation of wire number for maintenance. 2, strictly in accordance with the drawing requirements for the production of electronic control box, and connected to the power to do the no-load test. 3, in each contactor labeled with the name.
4, each electrical component wire with binding line fixed.
5, electrical contacts compression wire connector, motor main wire connector, should be wire card card tight, if necessary, hanging tin.
6, the equipment to be laid to connect the line pipe, and fixed with a card, PVC line pipe connection with glue, the mouth of the pipe with tape sealing.
7, the distribution box is installed horizontally and vertically, the environment is well lit, the house is dry and easy to observe and operate.
8, the wire in the line pipe area shall not exceed 50%.
9, the selection of wires to have a safety factor, the unit running or defrosting the wire appearance of the temperature shall not exceed 40 degrees.
10, the circuit system must be 5-wire system, there is no ground line to be added to the ground.
11, the wire should not be exposed to the open air, so as to avoid long-term sun and wind aging of the wire skin, short-circuit leakage and other phenomena.
12, wire installation should be beautiful and solid.
Technical requirements for refrigeration system fluoride charging and commissioning:
1. Measurement of power supply voltage.
2, measure the compressor three winding resistance and motor insulation.
3, check the refrigeration system valves open and close.
4, pumped to the liquid storage tank to inject refrigerant to the standard charge of 70% -80% weight, and then run the compressor, from low-pressure gas until enough.
5, after the boot first listen to the compressor sound is normal, to see the condenser, chiller operation is normal. Compressor three-phase current is smooth
6, smooth cooling, test the refrigeration system parts, exhaust pressure, suction pressure, exhaust temperature, suction temperature, motor temperature, crankcase temperature, the temperature before the expansion valve, to observe the evaporator, the expansion valve frost situation, observe the oil level and color changes in the oil mirror. The sound of the equipment running with or without abnormalities.
7, according to the cold storage frost and the use of setting the computer parameters and expansion valve opening degree.
8, the whole equipment wipe clean, clean environment.