Freeze Protection; Routine Maintenance - Gree D Serie Manual Del Usuario

D Series Modular Air-cooled Scroll Chillers Owner's Manual
(4) Unsolder the soldering spots of the suction and discharge lines.
(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.
Copyright 2018. This translation is property of GREE PRODUCTS SL. All rights reserved. Total or partial reproduction without its express authorization is prohibited.
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