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First, check before operation
The inspection of refrigeration equipment before starting is a key part of the normal operation of refrigeration equipment, so the operation and maintenance personnel should be particularly careful when checking:
1. Whether the power supply is within the range of 380V± 5%.
2. Whether the power supply and control switch are in the closing position.
3. Whether the button switch and indicator light on the electric control cabinet panel are in good condition and the indication is normal.
4, the controller display is normal, there is no fault display bar code or text.
5, whether the oil level of the refrigeration unit is in, the oil indicator mirror 1/2, how the oil color.
6, refrigeration unit oil temperature is in the normal temperature range.
7, the high and low pressure of the refrigeration unit is balanced.
8, refrigeration unit and system is there any leakage.
9. Check whether the valves on the refrigeration unit and refrigeration system, including the cooling water system, are fully opened.
10. Whether the liquid supply solenoid valve works normally.
11, evaporator system coil is abnormal sound.
12. Whether there is oil flower in the condensate of the evaporator.
13, the evaporator fan manual start whether there is abnormal sound.
14, the evaporator fan steering is normal.
15, check the refrigeration unit control panel and sensors and other parts are intact.
16, confirm the refrigeration unit control panel setting data is correct.
17. View historical fault records of the user menu.
18, check the control panel display no fault warning.
19, the compressor motor can be clicked to see whether it can be started, and there is no fault in the starting current is too large.
20, to determine whether the steering of the refrigeration compressor is correct, the compressor decision can not reverse this is particularly important.
Second, refrigeration auxiliary equipment inspection
The inspection of refrigeration auxiliary equipment before starting is an important part of the long-term normal operation of refrigeration equipment, so the operation and maintenance personnel must be particularly careful and careful inspection:
1. There is no leakage in the cooling tower pool.
2, the cooling tower pool has no water, the water level is normal.
3, cooling table water device is broken and falling off.
4, cooling tower water quality is normal.
5, cooling tower fan manual start whether there is abnormal sound.
6, cooling tower fan steering is correct.
7, cooling tower fan running current is normal.
8. Whether the cooling water pump is leaking at the root, and whether the valves are open.
9, cooling water pump manual start whether there is abnormal sound.
10, cooling water pump steering is correct.
11, cooling water pump running current is normal.
12, cooling water pump system instrument is damaged.
13, cooling pump system everywhere there is water leakage.
14, if it is an air-cooled condenser, check the steering, speed, current and voltage of the air-cooled condenser.
Start-up of refrigeration equipment
Before the official boot, please confirm the above:
1, press the start compressor button, then the cooling water pump will start to run, please check the running voltage and running start current of the cooling water pump is normal, then please check the inlet and outlet pressure of the cooling water pump is normal. The source of this article: refrigeration encyclopedia. Whether the liquid supply solenoid valve is opened, R22 liquid through the thermal expansion valve to the evaporator in the system to supply liquid, a few seconds after the suction pressure rises to a certain value, the compressor will issue a movement sound, the compressor starts, the compressor starting current is twice the rated current of the motor, the instant into the normal compressor motor rated current.
2, when the compressor is running normally, the compressor oil heater stops running, and the electric heater indicator light will be extinguished.
3, when the compressor is running, the coil or cooler in the warehouse will run and start to cool down.
4, when the cooling water temperature reaches 25 ° C, refrigeration encyclopedia tips: here to see the set temperature, the cooling tower fan will automatically open and run, forced air convection to reduce the temperature of the cooling water, then the operator needs to determine the operating voltage of the fan, the operating current and the fan running sound is normal.
5, when the compressor is fully running, it is necessary to confirm the running voltage, running current, and compressor running sound. Refrigeration encyclopedia Tips: The automatic unit is to run a compressor at the beginning. When the cooling capacity of the compressor cannot meet the external energy, the CPU will issue the command to start the second compressor to achieve the purpose of dual-machine operation.
6, if the machine is a double-head refrigeration compressor unit, at the beginning of the operation is to start a compressor, when the temperature sensor on the computer board detects that the temperature curve is not driven by cooling, the computer will drive the second compressor to start running. When the temperature of the cooling system reaches the set requirements, the CPU unloads a compressor to run. When the temperature of the warehouse reaches the set temperature, the CPU commands the first compressor to stop working and enter the standby state. When the second operating temperature is high and the room temperature is set, the CPU starts the first compressor to start working.
7, After the normal operation of the compressor system, the operator needs to confirm the compressor exhaust pressure, exhaust temperature, return air pressure, return air temperature, compressor oil pressure, oil temperature, oil level, (refrigeration encyclopedia tips: the oil level can not be less than 1/3 of the oil cup) oil color, condenser water temperature, condenser water temperature. These technical indicators should be in the normal range of compressor operation.
8, when the compressor runs for a period of time, to observe the cooling rate of the temperature of the warehouse, the cooling speed of the warehouse indicates that the refrigeration compressor is large, and the fan is more sufficient to stir the air in the warehouse. In addition, check whether the coil box has vibration sound, the chiller has no abnormal sound and the fan's steering is correct, and the condensate pipe has no backwater phenomenon.
9, when the temperature of the warehouse is close to the set value and the refrigeration compressor is running at full load, the evaporation temperature of the system and the air temperature of the fan coil should be checked, as well as the liquid flow of the liquid supply indicator mirror.
10. When the refrigeration compressor cools the warehouse, the compressor operation cycle is converted from one cycle to another, the operator needs to determine the cycle time of the compressor on and off, and it is best to record it.
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