Why is the unloaded function not working on my Hitachi Chiller?
If the unloaded function isn't working on your Hitachi Chiller, it could be due to: * Trouble with the thermistor. Adjust the setting temperature or replace the thermistor. * Trouble with the solenoid valve. Check the coil in the solenoid valve and check the oil passage for clogging. * Worn unloader mechanism. Check the unloaded system parts in the compressor.
Why is the compressor on my Hitachi Chiller so noisy?
A noisy compressor in your Hitachi Chiller could be due to: * Slugging caused by liquid flooding back to the compressor. Check the superheat of suction gas and keep it in the proper range. * Worn parts. Check for the sound of internal parts. Replace the compressor if necessary.
What causes low discharge pressure in a Hitachi Chiller?
Low discharge pressure in a Hitachi Chiller can be attributed to: * Extremely cold condenser air. Check the ambient temperature. * Insufficient refrigerant charge. Add refrigerant. * Leakage from the compressor discharge valve. Replace the valves or the entire compressor, if required. * Suction pressure is lower than standard. See “ Low Suction Pressure.”
Details about the twin screw compressor technology, its components, and principle of operation.
Procedures and precautions for main power and control wiring, including earthling.
Guidelines and recommendations for connecting water piping to the unit, including insulation.
A checklist for verifying all installation aspects are completed correctly.
Step-by-step procedure for conducting the test run of the chiller unit.
Overview of the control system, capacity control, and control panel functions.
Detailed settings for various controller parameters like temperature and mode.
Explains alarm codes and their meanings displayed on the control panel.
Detailed procedure for cleaning the water chiller's heat exchangers and piping.
Procedures for checking and charging the refrigerant system.
Details on safety devices and their settings for compressor and fan motors.
Specific servicing instructions and precautions for R407C refrigerant.
Table listing faults, possible causes, and corrective actions for common issues.
Schematics illustrating the power and control circuit wiring for the unit.
Tables showing performance data like capacity, input, and COP for various models.
Electrical specifications including voltage, current, and power for each model.
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General