Operation procedure of chilled water system

Operation procedure of chilled water system

In order to better ensure the normal refrigeration of the chiller, the general chilled water system operation should be carried out when the outdoor temperature is higher than about 30℃, and the formal chilled water system can be performed after the stand-alone operation and various preparations are completed and checked. Running.

　　Operation procedure:

1. Inject softened water into the chilled water piping system. When filling water, water should be taken in from the return water main (or water collector). When water is taken in, attention should be paid to the exhaust of the automatic exhaust valve. When the water is full, it should be used for air conditioning equipment. Manually exhaust one by one until the exhaust is clean. Check the water level in the expansion tank. The water level should be controlled below the highest water level. At the same time, the liquid level control device can be checked for accuracy and flexibility. Check the pipeline system for leakage during the water injection process. If it is serious, the water should be leaked and repaired.

　　2. Fill the cooling water piping system with water. When filling, water can be fed from the cooling water circulation tank or cooling tower water supply pipe, and the system is filled with water. Check the pipes and valves for leaks or loose closure.

3. After confirming that the chilled water and cooling water pipes are all filled with water, turn on the chilled water circulating water pump and the cooling water circulating water pump to carry out load operation. The air conditioning equipment still needs to be vented for the second time during the circulation process. Automatic exhaust is provided. Check the position of the valve for failure and water running, check the pipeline and valve for leaks, check the temperature rise of the motor bearing and the vibration of the water pump.

　　4. Start the cooling tower fan to run, check the circulating water volume, the water tank water level and automatic water replenishment, the float valve is normal, whether the nozzle sprays water evenly, and whether the nozzle is blocked.

　　 After the chilled water and cooling water piping systems are operating normally, the next procedure can be performed.

5. Start the chiller unit operation: Before starting the chiller unit, if it is determined that the manufacturer is responsible for debugging, the relevant technical personnel of the manufacturer should be responsible for checking whether the preparations are done before the unit is officially operated, and the chilled water and cooling water are circulated. To confirm the normal operation of the system, the construction unit and the manufacturer jointly check whether the power connection part and the pipeline connection part are correct. After checking that the valve opening status is normal, the compressor is preheated for 12 hours and then the power is turned on. The host will automatically delay after 3 minutes. Turn on, record the compressor suction pressure and discharge pressure, oil pressure and oil temperature, chilled water inlet and outlet pressure and temperature, cooling water inlet and outlet pressure and water temperature, condensing pressure and temperature, displayed on the dial every 2h after normal. Technical data such as evaporation pressure and temperature to verify the cooling effect.

　　6. The chiller runs continuously for 24 hours, and the chilled water inlet and outlet temperature meets the design requirements to complete the trial operation procedure.

7. When the operation is stopped, the power supply of the chiller should be turned off first. After the chiller stops running, stop the power supply of the chilled water circulating pump, the cooling water circulating pump and the cooling tower motor. The operation sequence of turning on and stopping the chiller should be strictly in accordance with the regulations The procedure is carried out to prevent the condenser and evaporator of the chiller from being damaged due to heat exchange without water.