10
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EPDT-213b
■
7. Maintenance
7.1 Troubleshooting
■
OB-30, OB-30U
Trouble
Cause
Remedy
Temperature does
not rise.
1. Inadequate adjustment.
1. Readjust according to “8.2
Adjustment” on page 8.
2. Insufficient drainage from the trap
of heat exchanger, etc.
2. Check the trap and replace it if
necessary.
Temperature rises
excessively.
1. Inadequate adjustment.
1. Readjust according to “8.2
Adjustment” on page 8.
2. Foreign substances stuck or
damage on the disc [3] and valve
seat [5].
2. Remove the foreign substances. If
there is damage on the parts, please
contact us to disassemble the product
and replace the parts.
3. The thermal bulb [20] or bellows
[14] is damaged.
3. Replace the sensor.
Large error of
temperature
control.
1. The thermal bulb [20] and
thermometer are installed in wrong
positions.
1. Reinstall them at points where the
circulation is best.
2. Inlet pressure is too high.
2. When steam consumption is small,
lower the inlet pressure for better
temperature control.
Outside leakage.
1. Leakage from the gasket [16].
1. Please contact us to retighten the
gasket, or disassemble the product to
replace the part.
2. Balance bellows [6] is damaged.
2. Please contact us to disassemble the
product and replace the part.
■
OB-31, OB-31U
Trouble
Cause
Remedy
Temperature does
not lower.
1. Inadequate adjustment.
1. Readjust according to “8.2
Adjustment” on page 8.
2. The thermal bulb [20] or bellows
[14] is damaged.
2. Replace the sensor.
Temperature lowers
excessively.
1. Inadequate adjustment.
1. Readjust according to “8.2
Adjustment” on page 8.
2. Foreign substances stuck or
damage on the disc [3] and valve
seat [5].
2. Remove the foreign substances. If
there is damage on the parts, please
contact us to disassemble the product
and replace the parts.
Large error of
temperature
control.
1. The thermal bulb [20] and
thermometer are installed in wrong
positions.
1. Reinstall them at points where the
circulation is best.
2. Inlet pressure is too high.
2. When steam consumption is small,
lower the inlet pressure for better
temperature control.
Outside leakage.
1. Leakage from the gasket [16].
1. Please contact us to retighten the
gasket, or disassemble the product to
replace the part.
2. Balance bellows [6] is damaged.
2. Please contact us to disassemble the
product and replace the part.
