Maintenance and maintenance of clean room air-conditioning facilities are essential. In addition to reasonable allocation of air-conditioning ventilation, electrical appliances and control, maintenance and maintenance of clean room air-conditioning systems must also be considered.
All these work must have the procedures of declaration, examination and filing, and the management rules of the maintenance of the whole purification air-conditioning system. Record the whole process of maintenance work, including the diagnosis of problems, replacement parts, date, time and maintenance personnel.
Clean air conditioning system is divided into three major systems: mechanical system, air system, air conditioning water system.
Mechanical system of clean air conditioning: The operation of clean air conditioning equipment is a mechanical running-in process, there must be loss, the loss between mechanical components will be deposited in the lubricant wear impurities. Long-term wear and tension will make lubricating oil lubrication decline, and even lead to the burning of compressors. Equipment running for more than three years must be maintained regularly, which is conducive to prolonging the life and operation of the equipment.
The air-cooled cooling system of clean air-conditioning will accumulate dust after running for a period of time, which will directly reduce the air volume, reduce the exchange of indoor air and fresh air, reduce the quality of indoor air, and cause poor heat dissipation, high pressure and overload operation of compressor.
The electric system of clean air conditioning mainly consists of air conditioning start-up cabinet, and the electronic components of start-up cabinet will contact badly due to long-term oxidation, even lead to the failure of phase absence or circuit breakdown.

The water system of clean air conditioning usually consists of two parts: open cooling water circulating system and closed chilled water circulating system. Open cooling water circulating water system, because the water will dissolve oxygen and bacteria, many salts dissolved in tap water, cooling water is open, and the air is fully in contact with the formation of biological sludge, biological sludge will clog pipelines and filters and other equipment.

In summary, electrochemical corrosion, scaling and biological sludge are the three main reasons for cooling water treatment. For closed refrigerated water circulation system, the main reason is the corrosion of dissolved oxygen and bacteria in water, and the blockage of pipelines and filters by biological sludge, which will reduce water flow and lead to the reduction of heat transfer efficiency. For every increase of dirt on condenser by 0.1 mm, the heat dissipation efficiency decreases by 5-10% and the power consumption of unit increases by 8-15%.
The overhaul of clean air-conditioning and the failure of PC central controller are completed by the foreign commissioner, and the refrigeration technician is responsible for the daily maintenance of central air-conditioning. Cooling tower maintenance: refrigeration technicians clean and maintain the cooling tower every six months. Maintenance regulation of clean air conditioning system.
1. Objective: To standardize the maintenance of centra

Four.
Valve Maintenance: Refrigeration technicians maintain valves once a year
1. Maintenance of control valves and control valves:
(1) Whether there is leakage or not, if so, the packing should be pressurized.
(2) Whether the valve is flexible in opening and closing, if the resistance is large, the stem should be filled with lubricant.
(3) Valves of the same type and specifications shall be replaced if they are broken or open or close.
(4) Whether the flange joint is leaking or not, if it is leaking, the sealing gasket should be replaced.
2. Maintenance of solenoid control valve and differential pressure control valve
(1) Whether the solenoid control valve and differential pressure control valve are reliable in operation or not, if there are any problems, the solenoid control valve and differential pressure control valve of the same type and specification should be replaced.
(2) Whether open and close flexibly, if the resistance is large, the valve stem should be filled with lubricant. If there is leakage in the filler, the filler should be pressurized.
(3) Whether the filter has been dirty blocked or absorbed moisture, if so, the same type of drying filter should be replaced.
Five.
Maintenance of inspection and control part: refrigeration technicians maintain inspection and control system once every six months
1. Maintenance of detectors (thermometers, pressure gauges, sensors).
(1) The ambiguous thermometer and pressure gauge should be replaced.
(2) Thermometers and pressure gauges can be used only after they are qualified.
(3) Whether the sensor parameters are normal or not and make simulation experiments, which are not qualified.
(4) Whether the detector is leaking or not, if it is leaking, the sealant pad should be replaced.
2. Maintenance of control part:
(1) Dust and dirt in the control cabinet.
(2) Tighten all terminals and replace those with severe ablation.
(3) The carbide alloy in the arc extinguishing cover of AC contactor belongs to particles; the contamination on the surface and around the contacts should be removed (but the contacts should not be frustrated). If the contacts are severely ablated, the AC contactors of the same specifications should be replaced; the dust and dirt on the iron core should be cleaned; and all tightening bolts should be tightened.
(4) Whether there is any trace of overheating or burns on the connection head of thermal relay, if there is any, it should be repaired and treated, and should be replaced if it fails to meet the requirements after treatment; check whether the insulation cover of thermal relay is complete or not, if damaged, it should be replaced.
(5) Measuring insulation resistance of automatic air switch with 500V shaker should not be less than 0.5M, otherwise it should be dried. Carbide or metal particles in the arc extinguishing hood should be removed, and the damage of the arc extinguishing hood should be replaced. Remove small metal particles (irreparable) from the contact surface.
(6) Check whether each signal lamp is normal or not, if not on, replace the small bulbs of the same specifications; Check whether the indicators are correct, if the deviation is too large, adjust them; if the adjustment still fails to meet the requirements, replace them.
(7) The intermediate relay and signal relay are simulated to verify whether their actions are reliable and the output signal is normal, otherwise they should be replaced.
(8) If there is any problem with the CPU or PCB, it shall apply for the maintenance of the outside party.
A. Repair and maintenance of compressors: refrigeration technicians maintain compressor mainframe once a year.
B. Check oil level and color of compressor. If the oil level is less than 1/2 of the position of the observation mirror, the cause of oil leakage should be found out and the oil should be filled after troubleshooting; if the oil has discolored, the lubricant should be replaced thoroughly.
Six.
Check whether there is air in the refrigeration system, otherwise it should be emptied.
Specifically check the compressor parameters as follows:
(1) Insulation resistance of compressor motor (normal over 0.5M).
(2) Compressor operating current (normal rating, three-phase basic balance).
(3) Compressor shell temperature (normal below 85oC).
(4) inspiratory pressure (normal value is 4.9-5.4 kgf/cm2).
(5) Exhaust pressure (normal value is 12.5 kgf/cm2).
(6) Compressor oil pressure (normal value is 10-15 kgf/cm2).
(7) Check whether the compressor has abnormal odor.
(8) Check whether the compressor has abnormal noise or vibration.
(9) Tighten all fasteners of the compressor and clean the compressor.
(10) Compressor failure can be judged synthetically through the above checks, and if so, it can be repaired by outsourcing.
Seven.
Supportive documents and records
1 "Clean Air Conditioning System Maintenance Record Form"