Central air-conditioning water system commissioning and step by step reference to a cold water system commissioning
DATE:2025-02-12
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1, cold water pipeline cleaning Given that the pipeline in the installation of welding process is easy to residual welding slag and other foreign matter, must be thoroughly cleaned before use, in order to prevent clogging of the pipeline or damage to the equipment. Cleaning steps include closing the inlet valve of fan coiler and air conditioner on each floor, opening the supply and return water connecting valve, starting the circulating pump to run for 3 to 5 hours, and then discharging the water in the system and cleaning the fan coiler and air conditioner filter one by one.
2, the collection of cold water branch pipe pressure drop and the total pressure drop of the system data to open all the fan coiler and air conditioner inlet and outlet valves, start the circulating pump according to the design pressure cycle, measure and record the total pressure drop of the branch pipe and the circulating pump. Subsequently, the system water pressure to the commissioning pressure (1.6KPa, that is, 16kg, hot and cold systems are required by design), turn off the circulating pump and keep it for more than 24 hours, and again measure the pressure drop data, compared with the design data, in order to find out the design and installation problems.
Second, the commissioning of the cooling system
1, the cleaning of the cooling pipeline cooling pipeline cleaning and cold water pipeline similar. If there is no filter on the pipeline, it is recommended that the air conditioning host and cooling tower inlet and outlet additional to deal with the cooling tower open operation of water pollution and condenser precipitation caused by internal problems.
2, cooling tower debugging cooling tower is the key equipment of the cooling system, in the cooling tower debugging first to determine the power supply is unobstructed. As more fans on the cooling tower, it is easy to mistake the power lines during installation. In the case of determining the power supply is unobstructed open the fan, close observation of the fan speed and steering. If you find that the fan does not turn, to check whether the wiring is correct; if you find that the fan's speed is very slow, to check whether the line is out of phase; if you find that the fan steering error is to replace the order of the line; the next step is to observe the cooling tower water distributor whether the water distribution is uniform, there is no blocking phenomenon. Finally observe when the water level rises or falls, the cooling tower level control valve can work normally, that is, when the water level falls whether the tower to make up water, the water level rises to the upper limit when the control valve can be closed in time.
Third, the end of the commissioning of equipment
1, fan coiler debugging Check the fan coiler model is correct, open the speed switch, adjust the wind speed from small to large, and measured at the outlet. If the wind speed is unchanged, check the speed switch wiring; wind speed from large to small, the wiring order is wrong. After the wind speed is normal, adjust the air outlet blades to optimize the wind direction. After running for a period of time, observe whether the condensate flows smoothly into the system condensate pipe; if there is overflow, adjust the slope of the condensate pipe.
2, the commissioning of the new air unit of the new air unit needs to focus on debugging. As the new air unit is the outdoor air after cold treatment into the temperature and humidity are suitable for the office environment of the new air, so the fan speed and the size of the wind is the key to the new air unit debugging. In addition to the fresh air unit, the duct system should also be checked. As the fresh air supply ducts are easily polluted during installation, the air should be purged after installation. Blowing is completed to test the air ducts in the ventilation valve and other devices whether the action, the new air pressure at the mouth of the air to meet the design requirements.
Fourth, the debugging of the air conditioning machine's first step, check whether the power supply lines and power distribution devices in line with the design requirements, including the diameter of the power supply cable, the main switch of the power distribution cabinet load bearing capacity, cable stranding firmness, the integrity of the power supply line connection and the power supply voltage range (370V ~ 390V). The second step is to check whether the centrifugal compressor inlet and outlet water pressure difference (1kg/cm²) and the chilled water system and cooling system pressure difference are up to standard, which can be adjusted by adjusting the inlet and outlet water valves of the host. At the same time, connect the flow probe and flow meter. The third step is to check the operating system of the air conditioning host. Check whether the centrifugal compressor operation display shows normal data and check the factory setting data. Step 4, vacuum the main unit and add appropriate amount of refrigeration oil and refrigerant. Step 5, input the working parameters according to the cooling capacity and modify the relevant data in the computer. The sixth step is to turn on the compressor when the oil pressure and oil temperature of the mainframe reach the standard working condition, observe the change of compressor fan door opening, and record and modify the working parameters in time during the running process. Finally, according to the running time and system load, judge whether the added refrigerant is the right amount. Adjust the cooling water flow to avoid the host shock or condensing pressure is too high.
Fifth, the commissioning of ancillary equipment
1, the debugging of the membrane water processor is installed in the cold water system to protect the pipeline corrosion equipment. The equipment inlet and outlet valves are installed, in the water cycle, check whether it is normal open and close.
2, circulating water pump debugging circulating water pump model to meet the design requirements, pump head is generally determined by the height of the floor, pump flow is generally determined by the system load and system volume. As the flow is a variable, so for energy-saving considerations, the pump is generally installed before the frequency conversion equipment, by the end of the temperature change in equipment to control the flow of the pump.
Water pump commissioning is generally divided into two stages: the first stage to check the pump power supply unit to ensure that the power supply is reliable and safe; the second stage to open the pump for operation, measuring the pump head, flow, sealing, noise and other parameters. If you find that the pump pressure gauge needle shaking badly, we must immediately check whether the system is air, water pump leakage; if you find that the pump noise increases, the bearing temperature rises, the pump must immediately stop running, check whether the pump bearings are worn out, whether the bearing chamber is out of oil.
3, the commissioning of the water tank in the system before putting into use to test the water tank in and out of the water valve is normally open, automatic devices (including water level meter) is working properly. To the water tank of the water source is smooth, if the tap water, check whether the water pressure meets the requirements; if the water source for the ion exchange equipment, but also to ensure that the equipment is normal water supply.
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2, the collection of cold water branch pipe pressure drop and the total pressure drop of the system data to open all the fan coiler and air conditioner inlet and outlet valves, start the circulating pump according to the design pressure cycle, measure and record the total pressure drop of the branch pipe and the circulating pump. Subsequently, the system water pressure to the commissioning pressure (1.6KPa, that is, 16kg, hot and cold systems are required by design), turn off the circulating pump and keep it for more than 24 hours, and again measure the pressure drop data, compared with the design data, in order to find out the design and installation problems.
Second, the commissioning of the cooling system
1, the cleaning of the cooling pipeline cooling pipeline cleaning and cold water pipeline similar. If there is no filter on the pipeline, it is recommended that the air conditioning host and cooling tower inlet and outlet additional to deal with the cooling tower open operation of water pollution and condenser precipitation caused by internal problems.
2, cooling tower debugging cooling tower is the key equipment of the cooling system, in the cooling tower debugging first to determine the power supply is unobstructed. As more fans on the cooling tower, it is easy to mistake the power lines during installation. In the case of determining the power supply is unobstructed open the fan, close observation of the fan speed and steering. If you find that the fan does not turn, to check whether the wiring is correct; if you find that the fan's speed is very slow, to check whether the line is out of phase; if you find that the fan steering error is to replace the order of the line; the next step is to observe the cooling tower water distributor whether the water distribution is uniform, there is no blocking phenomenon. Finally observe when the water level rises or falls, the cooling tower level control valve can work normally, that is, when the water level falls whether the tower to make up water, the water level rises to the upper limit when the control valve can be closed in time.
Third, the end of the commissioning of equipment
1, fan coiler debugging Check the fan coiler model is correct, open the speed switch, adjust the wind speed from small to large, and measured at the outlet. If the wind speed is unchanged, check the speed switch wiring; wind speed from large to small, the wiring order is wrong. After the wind speed is normal, adjust the air outlet blades to optimize the wind direction. After running for a period of time, observe whether the condensate flows smoothly into the system condensate pipe; if there is overflow, adjust the slope of the condensate pipe.
2, the commissioning of the new air unit of the new air unit needs to focus on debugging. As the new air unit is the outdoor air after cold treatment into the temperature and humidity are suitable for the office environment of the new air, so the fan speed and the size of the wind is the key to the new air unit debugging. In addition to the fresh air unit, the duct system should also be checked. As the fresh air supply ducts are easily polluted during installation, the air should be purged after installation. Blowing is completed to test the air ducts in the ventilation valve and other devices whether the action, the new air pressure at the mouth of the air to meet the design requirements.
Fourth, the debugging of the air conditioning machine's first step, check whether the power supply lines and power distribution devices in line with the design requirements, including the diameter of the power supply cable, the main switch of the power distribution cabinet load bearing capacity, cable stranding firmness, the integrity of the power supply line connection and the power supply voltage range (370V ~ 390V). The second step is to check whether the centrifugal compressor inlet and outlet water pressure difference (1kg/cm²) and the chilled water system and cooling system pressure difference are up to standard, which can be adjusted by adjusting the inlet and outlet water valves of the host. At the same time, connect the flow probe and flow meter. The third step is to check the operating system of the air conditioning host. Check whether the centrifugal compressor operation display shows normal data and check the factory setting data. Step 4, vacuum the main unit and add appropriate amount of refrigeration oil and refrigerant. Step 5, input the working parameters according to the cooling capacity and modify the relevant data in the computer. The sixth step is to turn on the compressor when the oil pressure and oil temperature of the mainframe reach the standard working condition, observe the change of compressor fan door opening, and record and modify the working parameters in time during the running process. Finally, according to the running time and system load, judge whether the added refrigerant is the right amount. Adjust the cooling water flow to avoid the host shock or condensing pressure is too high.
Fifth, the commissioning of ancillary equipment
1, the debugging of the membrane water processor is installed in the cold water system to protect the pipeline corrosion equipment. The equipment inlet and outlet valves are installed, in the water cycle, check whether it is normal open and close.
2, circulating water pump debugging circulating water pump model to meet the design requirements, pump head is generally determined by the height of the floor, pump flow is generally determined by the system load and system volume. As the flow is a variable, so for energy-saving considerations, the pump is generally installed before the frequency conversion equipment, by the end of the temperature change in equipment to control the flow of the pump.
Water pump commissioning is generally divided into two stages: the first stage to check the pump power supply unit to ensure that the power supply is reliable and safe; the second stage to open the pump for operation, measuring the pump head, flow, sealing, noise and other parameters. If you find that the pump pressure gauge needle shaking badly, we must immediately check whether the system is air, water pump leakage; if you find that the pump noise increases, the bearing temperature rises, the pump must immediately stop running, check whether the pump bearings are worn out, whether the bearing chamber is out of oil.
3, the commissioning of the water tank in the system before putting into use to test the water tank in and out of the water valve is normally open, automatic devices (including water level meter) is working properly. To the water tank of the water source is smooth, if the tap water, check whether the water pressure meets the requirements; if the water source for the ion exchange equipment, but also to ensure that the equipment is normal water supply.