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1.
When the product is newly installed or left without being operated for a long time, perform test
working before starting operation.
2.
Completely discharge the fluid inside of the product and line before leaving the product not
operated for a long time.
* Failure to follow this notice may cause malfunction due to rust inside of the product and lines, or
result in damage due to freezing.
3.
Sudden application of pressure to the product may open the valve instantly and cause leakage.
4.
Since the product is used with AC voltage, it may produce a buzzing sound depending on the
conditions of use.
7.2 Test working
Before performing test working, be sure to close the stop valves installed at both the inlet and the outlet
sides of the product and remove foreign substances and scale completely by flushing the bypass line.
1. Before leading the fluid into the product, switch it on and off a few times and confirm that clicking
sound caused by the plunger when the coil turns on.
2. Fully open the stop valve at the outlet side.
3. With the product at open position, open the stop valve at the inlet side gradually and confirm that the
fluid flows to the end of the piping.
4. Gradually close the stop valve at the outlet side, and confirm the fluid does not leak from the product
or connection parts of the piping joints.
5. With the product at closed position, fully open the stop valves at both the inlet and the outlet sides.
6. Switch on and off a few times to confirm that the product opens and closes properly.
7. With the product at closed position, confirm there is no leakage at the end of the piping.
In case of any abnormal condition observed during test working, refer to "8. Maintenance" to take
proper measures and treatment.
Since most of the troubles with the product are caused by foreign substances inside of the piping, care should
be taken. Note that any repairs caused by foreign substances or scales are subject to a charge even during the
warranty period.
8.1 Precaution for maintenance
Disassembly and maintenance must be done by experienced professional or valve manufacturer.
1. Confirm that no power is supplied before disassembling or maintenance.
* Failure to follow this notice may cause an electric shock.
2. Completely discharge the pressure inside of the product, line and equipment before disassembling or
maintenance and cool down the product till it can be touched with bare hands in the case of
high-temperature fluid.
* Failure to follow this notice may result in injury or burns due to residual pressure.
3. Do not supply electric power to the coil while it is detached from the valve.
* Failure to follow this notice may result in coil burnout or fire due to an overcurrent.
Caution
8. Maintenance
Warning
12
■ EPDT-266c ■
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