SMC Networks HRS012-A-10 Series - Page 90

HRX-MM-N007
Chapter 3 Alarm Indication and Troubleshooting
3.3 Troubleshooting HRS Series
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4. Check the display of the refrigerant circuit pressure sensor (for high pressure).
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 the "Ph: Refrigerant circuit pressure on the high pressure side" value in the "Check
Monitor Menu".
(4) Check if the value at the cross point of the ambient temperature and the "Ph: Refrigerant circuit
pressure on the high pressure side" value is within the range (the shaded part) in Fig. 3.3-51. If
the cross point is within the range, it means that the pressure sensor is operating correctly.
0.00
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
2.25
0 10 20 30 40 50
周囲温度[℃]
冷凍回路圧力センサ表示値[MPa]
Fig. 3.3-51 Ambient temperature and
refrigerant circuit pressure
Displayed value of the refrigerant circuit
pressure sensor (MPa)
Ambient temperature (
o
C)