Booster NBO - Brief Maintenance Check and Cleaning Method; Check for the Soft Water

19
2) Indication Method
Symbol
Indication Power failure or Cause for operation stop
Damper limit switch shut off
Leakage detection failure
Fuse cut-off, not reached up to the high water level
Protect relay operation error due to moisture( Remove
moisture by dry air)
Manipulation switch failure
◀
Operation No operation
without power
failure
Power failure
Suspected flame signal
▲
Damper open(to 2nd.
Combustion
position)
Combustion is
not performed
continuously
Limit switch open(short)
P
Suspected flame signal
■
Circuit check for
flame detector in the
control
Power failure
Control system failure
▼
Damper close(1st.
combustion
preparation)
No operation
continuously
Damper limit switch close(shut off)
Check the polarity of the flame detector
Ignition transformer failure
Fuel valve failure
Lack of flame stability
1
1st. safety time Power failure
Flame detector failure
2
2nd. safety time Power failure
Ignition failure of the burner(1st. solenoid valve shut off or
too much air volume)
Weak flame current
Fuel supply suspension
―
·
·
·
―
(2nd combustion)
Operation
Power failure
Abnormal operation of the flame detector(QRA-2), Clean
dust on the glass surface or flame-eye(P-930 -5)
3-2 Brief Maintenance and Cleaning Method
(1) Check for Soft Water
The followings are to be checked for the boiler durability:
1) Feed water must be soft water.
2) Soft water quality must be checked by the hardness indicator at least
once a day. (About 30 -50cc water in the container taken from the softener
outlet is examined by dropping the hardness indicator).
(Soft Water Check)