Describe again the technical installation requirements and precautions for the walk-in constant temperature and humidity test chamber
First, the installation of constant temperature and humidity chamber installation requirements
1. Picking: According to the engineering design and construction materials, we will collect materials from the parts warehouse, and carefully check the materials and accessories models.
2. Transportation: Before installing the constant temperature and humidity chamber, check the number of the board according to the invoice. When loading and unloading the library board, it is easy to handle it gently, and the anti-scratch layer is laid on each layer of the board and the ground joint.
3. When the cold storage is assembled as a whole, there should be a gap between the wall and the roof. The ground or bottom must be level and the construction environment should be clean.
4. Before the interior of the library body is fixed with angle aluminum, it is sealed with glass glue and fixed by angle aluminum. The rivet spacing is 300 mm. The upper and lower sides of the door are spaced 100 mm apart.
Second, the technical requirements for the installation of the air cooler
1. When selecting the position of the lifting point, first consider the position of the air circulation. Secondly, consider the direction of the library structure.
2. The gap between the chiller and the slab should be greater than the thickness of the chiller.
3. All hoists of the chiller should be tightened. Sealing bolts and bolts are sealed with a sealant to prevent cold bridges and air leaks.
4. When the ceiling fan is too heavy, use the 4th or 5th angle iron as the beam. The lintel should span across the other roof and wall panels to reduce load bearing.
Third, the refrigeration unit installation requirements
1. The oil separator should be installed in the semi-sealed or fully enclosed compressor, and an appropriate amount of oil should be added to the oil. When the evaporation temperature is lower than -15 degrees, a gas-liquid separator should be installed and an appropriate amount of refrigeration oil should be installed.
2. The base of the compressor should be equipped with a damping rubber seat.
3, the installation of the unit should have maintenance space, easy to observe the adjustment of the instrument and valve.
4. The high pressure gauge should be installed at the three-way of the liquid storage valve.
5. The overall layout of the unit is reasonable and the colors are consistent. The installation structure of each type of unit should be consistent.
Fourth, refrigeration pipeline installation requirements
1. The choice of copper pipe diameter should be in accordance with the pipe diameter of the compressor suction and exhaust valve interface. The pipe diameter should be increased when the condenser is separated from the compressor by more than 3 meters.
2. The suction surface of the condenser and the wall are kept at a distance of more than 400 mm, and the air outlet and the obstacle are kept at a distance of more than 3 meters.
3. The diameter of the inlet and outlet of the liquid storage tank shall be based on the exhaust and outlet diameters indicated on the unit sample.
4. The compressor suction line and the air cooler return line shall not be smaller than the size indicated in the sample to reduce the internal resistance of the evaporation line.
5. When the adjustment station is made, each outlet pipe should be sawed into a 45-degree oblique opening and inserted into the bottom end. The inlet pipe is inserted into one-fourth of the diameter of the regulating station.
6. The exhaust pipe and the return pipe should have a certain slope. When the condenser position is higher than the compressor, the exhaust pipe should be inclined to the condenser and a liquid ring should be installed at the compressor exhaust port. After the shutdown, the gas is cooled and liquefied back to the high pressure exhaust port, and the liquid is compressed when the machine is started.
7. U-bend should be installed at the exit of the return pipe of the air cooler. The return line should be oriented in the direction of 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, the valve body is vertical and the direction of the liquid is noted.
9. If necessary, install a filter on the compressor return line to prevent dirt in the system from entering the compressor and remove moisture from the system.
10. Before the sodium and lock nuts of the refrigeration system are tightened, the lubricating oil should be wiped to enhance the sealing. Wipe clean after tightening. The roots of each cut door should be locked.
11. The expansion valve temperature sensing package is fastened with a metal card at the outlet of the evaporator at 100mm-200mm, and is tightly wrapped with double insulation.
12. After the installation of the refrigeration system is completed, the overall appearance is beautiful and the colors are consistent. There should be no inconsistency in pipeline crossings.
13. When the refrigeration pipeline is welded, the sewage outlet should be left from high and low pressure with nitrogen blowing for partial blowdown. After the partial blowdown is completed, the whole system will be blown until no dirt is found. The blowdown pressure is 0.8 MPa.
14. After the whole system is welded, the air tightness test is carried out, and the high pressure end is filled with nitrogen 1.8MP. The low pressure side is filled with nitrogen 1.2MP. Leakage was carried out with soapy water during the filling, and the welds, flanges and valves were carefully inspected. After the completion, the pressure was maintained for 24 hours without pressure drop.
V. Distribution system installation requirements
1. Install the line number for each contact for maintenance.
2. Produce an electric control box in strict accordance with the requirements of the drawings, and connect the electricity to do the no-load test.
3. Name each contactor.
4. Fix the wires of each electrical component with tie wires.
5, electrical contact pressure wire connector, motor main line connector, the application line card is tight, if necessary, hang tin.
6. The connecting lines of each equipment should be laid and fixed with clamps. When connecting PVC pipes, glue them with glue, and the nozzles should be wrapped with tape.
7. The distribution box is installed horizontally and horizontally, and the ambient lighting is good. The inside of the house is dry and easy to observe and operate.
8. The area occupied by the wire in the wire pipe shall not exceed 50%.
9. The selection of the wire must have a safety factor. When the unit is running or defrosting, the temperature of the wire should not exceed 40 degrees.
10, the circuit system must be 5-wire system, there is no ground wire to install the ground wire.
11. The electric wire should not be exposed to the open air, so as to avoid the phenomenon of short-term leakage and electric leakage caused by long-term sun-bathing.
12, the line pipe installation should be beautiful and firm.
6. Technical requirements for charging and debugging of refrigeration system
1. Measure the power supply voltage.
2. Measure the resistance of the three windings of the compressor and the insulation of the motor.
3. Check the opening and closing of each valve of the refrigeration system.
4. After evacuating, inject the refrigerant into the liquid storage to 70%-80% of the standard filling amount, and then run the compressor from low pressure to sufficient amount.
5. After starting the machine, first listen to the sound of the compressor is normal, see if the condenser and the cooling fan are running normally. Whether the three-phase current of the compressor is stable.
6. After smooth cooling, check all parts of the refrigeration system, exhaust pressure, suction pressure, exhaust temperature, intake temperature, motor temperature, crankcase temperature, temperature before expansion valve, observe frosting of evaporator and expansion valve, Observe the oil level and color change of the oil mirror. Whether the sound of the device is operating abnormally.
7. Set the parameters of the computer and the opening degree of the expansion valve according to the frosting and usage of the cold storage.
8. The entire equipment is wiped clean and the environment is clean.
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