SMC Networks HRS012-A-10 Series Service Manual page 47

Cooling load that is larger than the heating capacity is being applied to the
1.
Thermo-Chiller.
Please refer to the "Heating capacity" graph shown in the Operation Manual.
Check the circulating fluid temperature sensor (PT1).
2.
Two circulating fluid temperature sensors are used; one is for the outlet port (PT1) and the other is
for the return port (PT2). Compare the temperatures sensed by the temperature sensors under the
conditions shown below to judge if the values provided by the temperature sensors are correct or
not:
(1) Connect a shorter pipe directly from the circulating fluid outlet port to the return port of the
Thermo-Chiller with a valve mounted to the outlet port. (Mount a valve to the outlet port to make
it possible to adjust the flow rate roughly.)
(2) Operate the Thermo-Chiller and stabilize the temperature.
(3) Check the temperature shown for "t1: Circulating fluid outlet temperature" and "t2: Circulating
fluid return temperature" in the "Check Monitor Menu".
If the temperature is within the range of t1 = t2 +/- 2
temperature sensor (PT1) is normal.
3. Check the circulating fluid temperature sensor (PT1) after it is replaced.
Replace the circulating fluid temperature sensor (PT1). (See section "4.5.1 Replacement of the
temperature sensor (PT1)".) After replacing, check that all the check items shown in "2. Check the
circulating fluid temperature sensor (PT1)" are correctly followed.
Check flow rate of the circulating fluid is not less than 5 L/min.
4.
Install a flow meter, and check the flow rate of the circulating fluid.
Check the pump performance.
5.
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.
Check after stopping power supply for the same alarm goes off again when the
6.
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.
HRS Series
Chapter 3 Alarm Indication and Troubleshooting
o
C, operation of the circulating fluid
HRX-MM-N007
3.3 Troubleshooting
3-31