SMC Networks HRS012-A-10 Series Service Manual page 70

HRX-MM-N007
Chapter 3 Alarm Indication and Troubleshooting
Check the display of the refrigerant circuit pressure sensor (for low pressure).
8.
Compare the refrigerant circuit pressure and the ambient temperature with those shown in the graph
to check the displayed value of the refrigerant circuit pressure sensor.
Follow the instructions shown below:
(1) Leave the Thermo-Chiller not operating for 24 hours to make the ambient temperature and the
temperature inside the Thermo-Chiller the same.
(2) Check the ambient temperature.
(3) Check "PL: Refrigerant circuit pressure on the low pressure side" value in the "Check Monitor
Menu".
(4) Check if the value at the cross point of the ambient temperature and the "PL: Refrigerant circuit
pressure on the low pressure side" value is within the range (the shaded part) in Fig. 3.3-30. If
the cross point is within the range, it means that the pressure sensor is operating correctly.
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0.00
After stopping power supply, check for the same alarm goes off again when the
9.
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.
3.3 Troubleshooting
3-54
0 10
Ambient temperature (
Fig. 3.3-30 Ambient temperature and
refrigerant circuit pressure
20 30 40
o
周囲温度[℃]
C)
50
HRS Series