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1. Check if the power supply of the unit is connected and the voltage is stable. Whether the oil heater is working properly. (Whether in winter and summer, the oil temperature should be in the following range: 37.6-64 ° C)
2. Turn on the chilled water pump and check if the chilled water system valve is in the open position and whether the chilled water is unblocked.
3. Start the cooling water circulation pump and check whether the cooling water system valves are all in the open position and whether the cooling water is unblocked.
4. Check the chilled water. If the inlet/outlet pressure difference is normal, check the operation panel and pressure gauge.
5. Check the cooling water. If the inlet/outlet pressure difference is normal, check the operation panel and pressure gauge.
6, confirm the freezing / cooling water system, the cycle is normal
7. Start the unit and the standby group runs stably.
8, check and record the unit operating voltage, current
9. Check and record the oil level of the unit and the oil return of the front and rear bearings.
10. Check and record oil pressure, oil temperature
11. Check and record the evaporator/condenser, refrigerant pressure
12. Check and record the operation of the exhaust system
13. Check the running sound of the unit, is it normal?
14. According to and record the condenser inlet water temperature. Note: The unit can be started up to three times in a row and each start time is 20 minutes. When the unit cannot be turned on normally, it must not be forced to start. It must be eliminated before it can be turned on.
2. Unit operation data record After the unit is in normal operation, record the following data and compare whether it is within the normal range. When the deviation from the normal value, notify the department leader or maintenance personnel in time to adjust the parameters in time to eliminate the fault:
1, unit evaporator / condenser, inlet / outlet water temperature, pressure
2, unit evaporator / condenser, saturation temperature / pressure
3, unit oil pressure difference, temperature, tank pressure, drain pressure
4, exhaust, intake temperature, exhaust / liquid temperature
5, exhaust pump working time, exhaust running time
6, the unit guide vane opening, guide vane position
7. The evaporator and condenser approach the temperature
8, compressor operating voltage / current, coil temperature
9. Number of compressor starts, running time three, chiller unit shutdown steps
1. Confirm that the unit is running for more than 30 minutes.
2. The unit is shut down normally and the standby group is completely stopped.
3. After 3.5~10 minutes, stop the cooling circulation pump
4, close the cooling water inlet / outlet valve
5, turn off the cooling tower fan
6, after 10~30 minutes, stop the refrigeration cycle pump
7. Close the chilled water inlet/outlet valve
14 chiller steps and troubleshooting
First, the boot process: