SMC Networks HRS012-A-10 Series Service Manual page 29

Ambient temperature is out of the specification range.
1.
Ambient temperature is higher than 40
specification").
External load is out of the specification range.
2.
Cooling capacity varies depending on the ambient temperature, set circulating fluid temperature,
and power supply frequency.
Please refer to the "Cooling capacity" graph shown on the Operation Manual.
3. Enough ventilation space has not been secured.
- The Thermo-Chiller is installed too close to a wall.
- There are other equipment close to the Thermo-Chiller.
- Hot ventilated air from other equipment enters the Thermo-Chiller.
- The Thermo-Chiller is operating in an enclosed space.
(e.g. In a room without ventilation or air conditioner)
The dustproof filter is too dusty.
4.
Dustproof filter on the front side of the
Thermo-Chiller or the fin of the air-cooled
condenser inside is contaminated.
Check the circulating fluid temperature sensor (PT1).
5.
Two circulating fluid temperature sensors are used; one is for the outlet port (PT1) and one 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 oC, operation of the circulating fluid
temperature sensor (PT1) is normal.
HRS Series
Chapter 3 Alarm Indication and Troubleshooting
o o
C (45 C for Option G "High ambient temperature
Fig. 3.3-5 An air-cooled condenser and a dustproof filter
HRX-MM-N007
3.3 Troubleshooting
3-13