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5. 7 Trouble and Corrective Actions
Trouble
temperature does not
rise.
Temperature rises
excessively.
Large error of
temperature
control.
Precautions during maintenance and inspection
5.8
(1) When using a hot fluid, do not touch the product by bare hand.
*Doing so may scald your skin.
(2) After aerating, do not retighten gasket.
* Doing so may break the gasket, possibly resulting in external leak.
(1) Do not disassemble the bellows when the thermal bulb is heated.
* If you do so, the bellows may be damaged and the original functions of the product are not realized.
(2) Do not apply shock to the thermal bulb.
(3) When disassembling a gasket, always replace it with new one.
*If an old gasket is used as is, the fluid may leak outside.
(4) Alcohols or specified chlorofluorocarbon is sealed in the thermal bulb. So when disposing of the products,
have a waste disposer collect and treat them. If you want us to do so, we undertake the service at cost.
Contact our sales office for more information.
5.9 How to Disassemble
(1) How to disassemble bellows
1. Take out the thermal bulb from the tank, chemical liquid tank or pipe area.
2. Turn the adjustment handle to the right (seen from above) and make the state in which the load from the
adjustment spring is not applied on the product.
3. Remove the bolts holding bellows cover and take out the bellows from the main body.
* Never heat the thermal bulb with the bellows detached. In case of the thermal bulb for setting low
temperature, follow the procedures described in section 3 above while cooling it in water.
Cause
1. Inadequate adjustment.
2. Nominal size of the product is too
small for the specifications of the
system.
3. Temperature range of sensor is not
proper.
4.
The
temperature
temperature adjustment valve is
higher than the preset temperature.
5. Insufficient drainage from the trap
of heat exchanger.
1. Inadequate adjustment.
2. Foreign substances are stuck
between main valve and main
valve seat, or either of the parts is
damaged.
3. There is leakage from the bypass
pipe.
4.
thermal
bulb
damaged.
1. Spindle and guide, or, pilot valve
and guide do not move smoothly.
2. bellows or valve shaft is deformed
because of external shock or
temperature higher than "withstand
temperature".
3.Thermal bulb and thermometer are
installed in wrong positions.
Warning
Warning
10
1. Readjust according to the
adjustment procedures.
2. Replace the product with one
of proper nominal size.
3. Check the label and replace
the sensor.
around
the
4.
windows
ambient temperature.
5. Open the trap's by-pass line
and check the condition.
1. Readjust according to the
adjustment procedures.
2. Repair by the factory is
necessary.
3. Repair or replace.
or
bellows
is
4. Replace the sensor.
1. Disassemble and clean, or
replace.
2. Replace the product.
3.Reinstall them at points where
the circulation is best.
Remedy
Install
ventilation
fans
to
decrease
■EPDT-258b■
or
the
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