Chapter 6 Maintenance of Boiler
6-1 Cause and Countermeasure for Trouble
When founded the trouble for boiler operation, check the following items before contact for A/S:
Trouble Condition Causes Countermeasure
No operation of the feed water
pump
1) Power shut off
2) Tube water is full.
3) Thermal relay(OCR1) of the
magnetic switch for the feed water
pump is operating normally.
4) Contamination of the water level
electrode bar.
5) Wire connection is loosed.
1) Check main power switch, the magnetic switch
connection, and if the power lamp is on.
2) Open the boiler main body blowing-off
valve(check
through water level gauge).
3) Investigate the trouble cause and take corrective
action ,and then reset.
4) Check and clean it one by one.
5) Fasten tightly the electrode bar holder and the terminal
in the control box.
No water feeding but the feed
water pump is operated.
1) No water in the feed water tank, or
slow speed of flowing in .
2) Closed the main valve of the feed
water tank.
3) Clogged the feed water strainer.
4) Opened the boiler main body
blowing- off valve.
5) Air included in the feed water pump.
1) Check the water in the tank ,and clean the ball tap and
The strainer.
2) Open the main valve.
3) Clean the strainer.
4) Close the valve.
5) Extract the air by opening the air extraction valve.
Low water indication buzz is
alarming but indicated normal
water level on the water level
gauge
1) Contamination or cut-off of the low
water level electrode bar.
1) Check and clean the low water level electrode bar.
2) Earthing conductor cut-off or incomplete contact.
Feed water pump is not
stopped.
(keep operating)
1) Contamination or cut-off of the high
water level electrode bar
1) Check and clean the high water level electrode bar.
2) Earthing conductor cut-off or incomplete contact.
Frequent ON-OFF of feed
water
1) Low water pressure
2) High concentration of tube water
3) High variation of load.
4) Contamination or incomplete contact
of the water level electrode.
1) Adjust the main steam valve raise the pressure.
2) Perform the blowing off.
3) Open and close the main steam valve slowly.
4) Check and clean it one per one time.
No operation of the Blower 1) Power shut off.
2) Water level is not reached up to
setting level.
3) Terminal relay(OCR2) is operating.
4) The boiler pressure is not reach up to
setting pressure.
1) Power “ON”.
2) Wait until low water lamp is turned off and the feed
water pump is stopped.
3) Investigate the cause and reset.
4) Drop down the steam pressure.
Alarm indicating abnormal
burner operation is buzzing
1) Attached the carbon and smoke on
the glass of the flame detector.
2) Contaminated the spark electrode.
3) Inappropriate distance of the spark
electrode.
4) Opened too wide the blower damper.
1) Clean the glass surface of the flame detector.
2) Clean the spark electrode.
3) Adjust the distance of the spark electrode.
4) Close the damper appropriately.
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