HRX-MM-N007
Chapter 3 Alarm Indication and Troubleshooting
HRS Series 3.3 Troubleshooting
1. Check the surrounding environment.
Check if the surrounding environment is in the conditions shown below:
(1) Flow rate fluctuates due to a valve and a switching valve in the external piping. (Heat load is
fluctuating.)
(2) The system has a circuit that low temperature circulating fluid returns to the Thermo-Chiller at
once.
2. Flow rate of the circulating fluid is less than 5 L/min.
Install a flow meter, and check the flow rate of the circulating fluid.
3. Check the pump performance.
Install a flow meter. Refer to the "Pump capacity" graph" shown in the catalogue and check that the
pump capacity is suitable for the circulating fluid outlet pressure and the circulating fluid flow rate.
4. Check the pressure sensor in the refrigerant circuit.
Two pressure sensors, one for high pressure and the other for low pressure, are used for the
refrigerant circuit. Take the following instructions to check for any abnormality with the pressure
sensors:
(1) Stop the Thermo-Chiller operation.
(2) Check the temperature shown for "Ph: Refrigerant circuit pressure on the high pressure side"
and "PL: Refrigerant circuit pressure on the low pressure side" in the "Check Monitor Menu".
(3) If the pressure value shown by each sensor is +/- 0.1 MPa (Ph = PL +/- 0.1), it means that the
pressure sensors are operating correctly.
5. After stopping power supply, check for the same alarm goes off again when the
chiller is re-started.
After stopping power supply (by tuning off the power supply switch on the Thermo-Chiller), check if
the same alarm goes off again when the Thermo-Chiller is restarted.
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