D Series Modular Air-cooled Scroll Chillers
38
(5)
Remove the screw bolts of the compressor and check the oil quality and accumulator.
(6) Remove the compressor.
(7) Clean up the pipeline.
7.10 Freeze Protection
When the flow passage of the shell-and-tube heat exchanger is frozen up, it would cause serious
damage to the heat exchanger, such as cracking and leakage which are out of warranty, therefore, the
user should take measures stated below for freeze protection.
(1)
Under subzero conditions, it is necessary to shut down the chiller installed outdoor and then drain the
evaporator completely.
(2)
Failure of the chilled water flow switch and the anti-freezing temperature sensor will cause the tube
frozen up, so the flow switch shall be interlocked with the chiller.
(3)
When charging or recovering the refrigerant, the evaporator would crack because of frostbite provided
the refrigerant pressure inside the evaporator is under 0.4MPa. Therefore, be sure to keep the water
flow continually inside the evaporator or drain it completely.
7.11 Routine Maintenance
Routine maintenance shall be performed periodically by the qualified technician so as to extend the
service life of the unit and lower the possibility of occurrence of faults.
Record and keep the running status of the unit to facilitate troubleshooting for the servicemen.
◆
Daily Maintenance
(1)
Check the circulating water pump and the flow rate.
(2)
Check the voltage and power supply.
◆
Weekly Maintenance
(1)
Check if the oil level keeps more than half of the sight glass, however the oil shall not be overcharged.
(2)
Check the main unit, like if the compressor runs with abnormal noise, if the distribution box is attached
securely and if the pipeline generates abnormal vibration or leakage.
(3) Record key parameters, like pressure, pressure etc.
◆
Quarterly Maintenance
(1)
Check the electric wiring and electric insulation.
(2) Check and adjust the set point of the temperature.
◆
Yearly Maintenance
(1)
Check valves and pipeline of the water system. If necessary, clean the filter and analyze the water
quality. If the water circuit needs to be cleaned, please consult the assistance of the qualified
personnel.
(2) Clean the corrosive surface and paint it again, and check if the door of the electric control cabinet is
tightly closed.
(3)
Check if the pipeline is secured and so the water pump and fittings. Additionally, check if the refrigerant
charge is sufficient, if not, add some.
(4)
Perform the items for weekly maintenance.
(5) Check if the control device is set and acts properly.
(6) Check if the refrigerant pipe is attached securely.
(7) Check if the motor coil is insulated.
