Some general check-up must be followed before and after running of the refrigeration plant. Some of the important steps are given below:
1. Check all the electrical wires and connections and make sure that all these are in order and well tight.
2. Any wiring diagram and instruction manual should be carefully read and followed.
3. Check the HP, LP cutouts, water flow control valves, pressure regulating valves and all other safety controls and adjust these, if required.
4. Check the temperature controller for its normal functioning.
5. Observe oil level in the compressor crankcase. It should be slightly above the center of the sight glass. Use only proper grade of oil as recommended by the manufacturer for the particular type of compressor.
6. Switch on the condenser fan motor or water pumps in case of water-cooled condenser.
7. After ensuring the proper working of condenser, compressor is switched on.Also check the drive belt tension before starting the compressor. In case the compressor does not start, either there may be some electric problem or some problem in setting or working of LP and HP cutouts or temperature controller.Check all these satisfactorily. If the compressor starts then do not leave system unattended till it has reached its normal operational conditions and again check the following points.
8. The line voltage and load drawn by each phase should be recorded by using proper instruments. The load drawn by each phase should be equal.
9. Check the suction and discharge pressures in the pressure gauges. If these are not within designed limits, determine, why it is so and take the corrective action.
10. Check the flow rate of refrigerant in sight glass or in ‘rotameter’ and if there is an indication of less quantity of refrigerant, check for any leakage. Then switch off the plant and thoroughly repair the leaky points before adding refrigerant.
11. Again observe oil level in the compressor crankcase through the sight glass and add oil if necessary.
12. If there is a thermostatic expansion valve, feeler bulb must be in positive contact with the suction line and it should be filled with the right amount of gas. It should also be ensured that there is no liquid refrigerant feedback to the compressor crankcase.
13. Recheck all the control valves and safety devices for proper operation and adjust these if necessary.
1. Check all the electrical wires and connections and make sure that all these are in order and well tight.
2. Any wiring diagram and instruction manual should be carefully read and followed.
3. Check the HP, LP cutouts, water flow control valves, pressure regulating valves and all other safety controls and adjust these, if required.
4. Check the temperature controller for its normal functioning.
5. Observe oil level in the compressor crankcase. It should be slightly above the center of the sight glass. Use only proper grade of oil as recommended by the manufacturer for the particular type of compressor.
6. Switch on the condenser fan motor or water pumps in case of water-cooled condenser.
7. After ensuring the proper working of condenser, compressor is switched on.Also check the drive belt tension before starting the compressor. In case the compressor does not start, either there may be some electric problem or some problem in setting or working of LP and HP cutouts or temperature controller.Check all these satisfactorily. If the compressor starts then do not leave system unattended till it has reached its normal operational conditions and again check the following points.
8. The line voltage and load drawn by each phase should be recorded by using proper instruments. The load drawn by each phase should be equal.
9. Check the suction and discharge pressures in the pressure gauges. If these are not within designed limits, determine, why it is so and take the corrective action.
10. Check the flow rate of refrigerant in sight glass or in ‘rotameter’ and if there is an indication of less quantity of refrigerant, check for any leakage. Then switch off the plant and thoroughly repair the leaky points before adding refrigerant.
11. Again observe oil level in the compressor crankcase through the sight glass and add oil if necessary.
12. If there is a thermostatic expansion valve, feeler bulb must be in positive contact with the suction line and it should be filled with the right amount of gas. It should also be ensured that there is no liquid refrigerant feedback to the compressor crankcase.
13. Recheck all the control valves and safety devices for proper operation and adjust these if necessary.
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