Booster NBO User manual

OPERATION MANUAL
BOILER FOR FUEL OIL
( NBO -TYPE )
BOOSTER Boiler Co., Ltd.

1
Thank you very much for purchasing Booster boiler.
The Booster boiler is a once through type steam boiler with highest thermal efficiency. Equipping various safety
devices, the BOO TER boiler is being used the most safely. This operation manual describes the operation method
and brief maintenance method. Before you start the operation, please read this manual carefully and always main
tain in the best operation condition.
Contents
C apter 1 General
1-1 Part Name and Function for the Boiler ------------------------- 4
(1) Part Name and Function for the Boiler Main Body ----------------- 4
(2) Part Name and Function for the Control Panel -------------------- 5
(3) Part Name and Function for the Burner ------------------------- 6
(4) Part Name and Function for the Concentration Blowing-off Assembly
and the Oil Pump ------------------------------------------ 7
1-2 Steam Generation System------------------------------------ 8
(1) From Water feeding to Steam Generation------------------------- 8
(2) Flow sheet - ---------------------------------------------- 9
C apter 2 Boiler Operation
2-1 Check Item before Operation--------------------------------- 10
2-2 Operation Start--------------------------------------------10
2-3 Operation Stop--------------------------------------------10
2-4 Cautions during Operation -----------------------------------10
2-5 Checking the Combustion Condition during Operation---------------11
2-6 Instruction for the Boiler When It is not Operated for a Long Time-----11

2
C apter 3 Manipulation of t e Auxiliary Equipment
3-1 Manipulation Method ---------------------------------------------------------------------------12
(1) etting Method for the Thermal Relay of the Magnetic witch(OCR) ------------ ------- 12
(2) Adjusting Method for the Pressure witch -------------------------------------------------- 13
(3) Air Extraction for the Feed Water Pump ---------------------------------------------------- 13
(4) Air Extraction Method for the Oil Heater --------------------------------------------------- 13
(5) Pressure Adjusting Method for the Oil Pump ----------------------------------------------- 13
(6) Wiring Method for the Feed Water Pump and the Oil Pump ------------------------------ - 14
(7) Capacity Adjusting Method (Damper Blade) -------------------------------------------------- 14
(8) Adjusting Method for the Water Level Control Equipment ------------------------------- 16
(9) Concentration Blowing-off Device ------------------------------------------------------------17
(10) Operation status for Combustion Control(Protect Relay) --------------------------------18
3-2 Brief Maintenance Check and Cleaning Method --------------------------------------------- 19
(1) Check for the oft Water ---------------------------------------------------------------------- 19
(2) Check for the Concentration Blowing-off Device ------------------------------- -----------20
(3) Check and Cleaning for the Oil trainer ----------------------------------------------------- 20
(4) Check and Cleaning for the Oil Heater trainer -------------------------------------------- 20
(5) Check and Cleaning for the Feed Water trainer and the Concentration
Blowing-off trainer ---------------------------------------------------------------------------- 21
(6) Check and Cleaning for the Water Level Electrode Bar ----------------------------------- 21
(7) Check and Cleaning for the Oil Pump -------------------------------------------------------- 21
(8) Check for the afety Valve --------------------------------------------------------------------- 22
(9) Check and Cleaning for the Burner ----------------------------------------------------------- 22
(10) Cleaning for the Returning Water Tank and Check for the Ball Tap --------------------- 24
(11) Cleaning for the Oil Tank ----------------------------------------------------------------------- 24
C apter 4 Safety Device
4
-1 uperheating Prevention for the Boiler Main Body ------------------------------------- 24
(1) Burner Operation uspension at the Low Level -------------------------------------------- 24
(2) uperheating Prevention witch -------------------------------------------------------------- 25
4-2 Freezing Prevention ------------------------------------------------------------------------------- 25

3
C apter 5 Boiler Water Treatment
5-1 Boiler Water Treatment ---------------------------------------------------------------------- 26
(1) Harm for the Boiler by Water ------------------------------------------------------------ --- 26
(2) cale Protection ----------------------------------------------------------------------------- -- 26
(3) Corrosion Protection -------------------------------------------------------------------------- 27
5-2 Instruction for Blowing-off of Water ------------------------------------------------------- 27
C apter 6 Maintenance for Boiler
6-1 Cause and Countermeasure for Trouble --------------------------------------------------- 29
6-2 Maintenance Checksheet --------------------------------------------------------------------- 30
6-2 After ervice ----------------------------------------------------------------------------------- 31
C apter 7 Reference Document
7-1 Piping Instruction for the Feed Water Pump ----------------------------------------------32
7-2 Piping Diagram for the Feed Water Pump ------------------------------------------------ 33
7-3 Piping Drawing for oftener -----------------------------------------------------------------34

4
C apter 1 General
1-1 Part Name and Function for Boiler
(1) Part Name and Function for t e Boiler Main Body
No.
Nomenclature Function
1 Automatic control panel Operates boiler, start and stop.
2 afety valve afety device which exhausts steam if the boiler main body
pressure is above 10Kg/cm2.
3 Burner Combustion equipment which sprays the fuel mechanically.
4 Main steam valve A valve used for steam supply.
5 team separator A equipment generating high dryness steam through
separating the steam and the moisture.
6 Pressure gauge A gauge which indicates the steam pressure in the boiler
7 Air Extraction Valve A valve extracting air and draining water when blowing-off.
8 Water level gauge A gauge which indicates water level in the boiler.
9 Motor for oil gear pump A motor which supplies fuel to the burner by pressurizing
fuel.
10
Ladder A structure to climb up to the top of the boiler.
11
Concentration blowing-
off solenoid
valve
A device which controls concentration of water by blowing
off automatically.
12
Blower A equipment which generates air for combustion and
forwards it to wind box.
13
Wind box A equipment which supplies air for combustion in the
furnace.

5
(2) Part Name and Function for t e Control Panel
No.
Nomenclature Function
1 Warning Buzz A alarm which buzzes when abnormal tube water condition.
2 Protect relay Controls combustion, and stops operation when emergency.
3 Initial chemical injection device A device which injects chemicals for corrosion protection
when initial operation.
4 Fuse Protects control system by cut-off when over current.
5 Magnetic switch for burner motor Controls the burner motor operation.
6 Terminal board for power Connects between wire on the control panel and the external
power.
7 Magnetic switch for feed water pump Controls operation of the feed water pump
8 Magnetic switch for oil pump Controls operation of the oil pump.
9 Circuit breaker hut off when over current and electrical leakage.
10
Terminal board Connects wiring in the control panel and external wire.
11
Water level controller Controls water level and integrates combustion time.
12
Flame detection transducer Transduce the signal of flame eye to electrical signal for
control

6
(3) Part Name and Function for t e Burner
No.
Nomenclature Function
1 Burner A equipment which sprays and burns fuel.
2 afety valve A safety device which open and exhausts steam automatically
at above 10 Kg/cm2 of the boiler main body pressure.
3 Ignition transformer A device which makes spark for ignition.
4 Blower motor Rotates the blower for supplying combustion air.
5 Blower body Impeller is included in it.
6 Damper motor A device which controls capacity automatically for complete
combustion.
7 Flame eye(flame detector) A device which detects ignition or flame failure, and have
stop operation.
8 Wind box A box which supplies air for combustion in the furnace.
9 olenoid valve A device which controls fuel supply depending on low fire
and high fire.
10
Upper terminal box A terminal board for power supply on upper side.

7
(4) Part Name and Function for t e Concentration Blowing-off and t e
Oil Pump
No.
Nomenclature Function
1 Concentration blowing-off valve It is used for replacing the solenoid valve for continuous blow
or cleaning the strainer.
2 Concentration blowing-off strainer
It is used for filtering the blowing-off water and sludge.
3 Oil heater strainer It is used for filtering the sludge in the heater.
4 Oil heater It is used for heating the fuel(for heavy oil).
5 Concentration blowing-off
solenoid valve
A solenoid valve which drains and shut off the blowing-off
water automatically.
6 Oil pump motor A motor which rotates the oil pump.
7 Oil pump coupling It connects the oil pump to the oil pump motor.
8 Oil pump A equipment which pressurizes and supplies fuel to the burner.
9 Oil strainer It is used for filtering foreign substance in the oil.
10
Oil pressure gauge It Indicates pressure of fuel coming out from the oil pump.
11
Oil air cock It is used for extracting air in the oil pump.

8
1-2 Steam Generation System
(1) From Water Feeding to Steam Generation
1) Water Feeding
Raw water at the pressure of 1.5 - 5 kg/cm2 is flowing to softener[2] for making soft water. The soft water is flowing
to the feed water tank[3]. The water level of the feed water tank is maintained constantly by the ball tap. When the
power switch “ON”, the feed water pump[6] is operated(the chemical injection pump[10] is also operated for
injecting the tube cleaning detergent) and the feeding water from the feed water tank is pressurized and forwarded to
the evaporating tube by the feed water pump[6] through the feed water strainer for filtration of foreign substance,
check valves[7], [8] in feed water line and lower header.
2) Oil Feeding
The oil which is removed the foreign substance through the oil strainer[29], [30], [53] is pressurized up to the
specified pressure(15 Kg/cm2 for light oil, 20 Kg/cm2) by the oil pump[32] ,and is sprayed through nozzle. When
using the “B” heavy oil or “C” heavy oil, the oil is sprayed after heating by the oil heater[31] due to its high viscosity
at the ambient temperature.
3) Ignition
The lighting bar makes spark by the raised voltage(from 220V to 10,000 - 13,000V: 10,000V for light oil, 13,000 for
heavy oil) from ignition transformer and ignites the flame on the sprayed oil from nozzle.
4) Steam Generation
The water in the tube is heated by the combustion of burner and evaporated on the evaporation surface. The saturated
steam including moisture is forwarded to the steam separator through upper header. This steam including moisture is
separated into steam and moisture by the steam separator[12] ,and the dry steam only is supplying for load through
the valve[14].

9
(2) Flow S eet
Light oil specification
NO NAME NO NAME
1 Boiler 35 2
nd
oil solenoid valve
2 oftner 36 1
st
oil solenoid valve
3 Feed water tank 37 Return solenoid valve
4 Feed water valve 38 Float switch
5 Feed water strainer 39 Oil temperature gauge
6 Feed water pump 40 Plug heater
7 wing check 41 Control box
8 Lift check 42 Feed oil valve
9 Feed chemical check 43 Feed oil valve
10 Feed chemical pump 44 Akastart(Burner temp. sensor)
11 Feed chemical tank 45 Circulation pump
12 team separator 46 Feed oil valve
13 Water level gauge 47 Feed oil valve
14 Main steam valve 48 By-pass valve
15 Air extraction valve 49 Oil water separator
16 Low pressure gauge 50 Blowing-off valve
17 High pressure gauge 51 Pressure gauge
18 team pressure gauge 52 Air extraction valve
19 afety valve 53 Oil strainer
20 Concentration blowing-off
valve 54 Oil nozzle
21 Concentration blowing-off
strainer 55 team control valve
22 Concentration blowing-off
valve 56 team strainer
23 Concentration blowing-off
solenoid valve 57 team solenoid valve
24 Blowing-off valve 58 team valve
25 ampling valve of the tube
water 59 team By-pass valve
26 Oil tank 60 team blowing-off valve
27 Feed oil valve 61 team trap
28 Oil tank blowing-off valve 62 Blower motor
29 Oil strainer 63 Feed oil valve
30 Oil strainer 64 Feed oil valve
31 Oil heater 65 Oil heater sensor
32 Oil pump 66 Diesel tank
33 Pressure gauge 67 Return pressure control valve
34 Oil temperature gauge 68 Pressurizing pump
Heavy oil specification

10
C apter 2 Boiler Operation
2-1 C eck Item before Operation
* Before start the operation, check the following items:
(1) The gauges(whether the pressure gauges, oil pressure gauges and water level gauges are working in
the normal condition).
(2) Water level in the feed water tank before opening the feed water valve;
(3) Oil level in the oil tank before opening the valve;
(4) Cleaning detergent in the chemical injection tank;
(5) Quality of soft water.
2-2 Operation Start
(1) Main switch for boiler “ON”.
(2) The power switch “ON” on the control panel equipped with the
front side of the boiler.
(3) Check that the water level on the water level gauge is normal, and
water is feeding automatically.
(4) Operation switch “ON” on the control panel.
(5) Push the manipulation switch(push button) for boiler operation.
(6) Check ignition condition in the low and high fire through the
reflection mirror after normal operation.
(7) Open the main steam valve slowly when the steam pressure is
reached up to 3 Kg/cm2.
(Control panel)
2-3 Operation Stop
(1) Operation switch “OFF”.
(2) Power switch “OFF” after post purge.
(3) In case of using bunker C oil, it is to be ignited by the light oil for 10 minutes before operation
suspension.
(4) Close the fuel valve and the main feed water valve.
2-4 Cautions during operation
(1) Open the main steam valve slowly.
(if open the valve rapidly, the water level in the tube could be the low level temporarily).
(2) In the event that the operation is stopped through sensing of the thermistor due to superheating of
the boiler main body, the operation switch and the power switch is to positioned to “stop” and close
the main fuel valve slowly.

11
(3) In case of suspension of water supply or power interruption, wait until the power or water is supplied
again in the condition of power “OFF”.
(4) In case of abnormal noise due to ignition failure or flame failure, the power switch “OFF” and the
gas in the firebox and the flue is to be purged by the blower, and try to re-ignite. If ignition failure
again, stop the operation and check the fuel in the oil storage tank, pressure of the oil pump, oil
temperature, flame eye(flame detector), ignition device and nozzle, etc.
(5) In case that the operation of boiler is to suspended for a moment and try to restart the operation for
the boiler using bunker-C oil, oil preheating is necessary up to appropriate temperature.
Preheating temperature:
A-heavy oil : 50 - 60°C, B-heavy oil : 90 - 110°C, C-heavy oil : 130 - 150°C.
2-5 C ecking t e Combustion Condition during Operation
For complete combustion, the balance of fuel and air volume( excess of air ratio) is to be appropriate. BOO TER
boiler have so manufactured as to do complete combustion utilizing the automatic damper control of the three
position control method. The burning gas is also to be able to verified visually and checked as follows:
(1) When the flame color is red and black smoke in the stack
1) Lack of combustion air(damper closed).
2) Oil spray is not performed smoothly due to dust in the nozzle.
3) Oil temperature is too low.
4) Interval between flame panel and diffuser is in appropriate.
5) Oil quality is no good.
(2) When the flame color is bright and white smoke( the flame is short and split)
1) Combustion air is too much.
(3) The flame color is brown and white smoke but combustion condition is good
1) The moisture of exhaust gas has formed dew due to radiating in the flue and gas temperature drop.
(4) Flame failure during combustion
1) 1st. and 2nd. solenoid valve is shut off and oil supply is shut off through the flame detector’s
sensing.
2) Warning lamp of the protect relay is lit up and the alarm is buzzing informing abnormal
combustion.
3) Investigate and take a corrective action for the cause of warning lamp operation of protect relay,
and push the reset button for reoperation.
* Note
Trying for reoperation should be done minimum 1 minute after warning lamp operated. If the boiler
is not operated in spite of trying reoperation in several times, please contact to BOO TER A/ team.

12
2-6 Instruction for t e Boiler W en It is not used for a Long Time
Most people cares a lot for corrosion protection of the boiler during operation, but cares nothing for the boilers which
is not used for a long time. In case that the boiler is not used for a week, the boiler could be corroded unexpectedly
due to wrong preservation.
The boiler preservation methods are as follows:
Boiler banking method by fulfilling water: injects the chemical to the boiler water to remove the
dissolved oxygen for maintaining the PH of the water as. PH 11.0 - 11.8.
Boiler banking method by drying : stores the boiler in the dry condition for freezing prevention in winter time.
C apter 3 Manipulation of Auxiliary Equipment
3-1 Manipulation Met od
(1) Setting Met od for t e T ermal Relay(OCR) of t e Magnetic Switc
If the motor for blower, feed water pump or oil pump is
overloaded due to any reason, the thermal relay(overload
protection device) is working and then shut off the
magnetic switch to stop the motor for protection of it.
When the thermal relay is working, the lamp indicating
overcurrent is lit up, warning alarm is buzzing and reset
lever of the thermal relay is raised up about 2mm.
Pushing the reset lever after checking and corrective action (T ermal relay of t e magnetic switc )
for motor, it will be reoperated
(2) Adjusting Met od for t e Pressure Switc
It is able to adjust the pressure range of 4 -9 Kg/cm2
(below maximum pressure). The pressure of the pressure
switch is adjusted by using the pressure adjusting bolt
and the pressure variation adjusting bolt to control
“ON - OFF” for combustion.
* Example of Pressure Adjusting :
In order to perform combustion as the figure
in the right side:
1) et the pressure adjusting bolt of the high pressure switch to 8 Kg/cm2.
2) et the pressure variation adjusting bolt of the high pressure switch to 3Kg/cm2.
3) et the pressure adjusting bolt of the low pressure switch to 6 Kg/cm2.
4) et the pressure variation adjusting bolt of the low pressure switch to 1 Kg/cm2.

13
Note :
The copper pipe connected to the pressure switch has antifreezing solution for freezing prevention,
o, refilling the antifreezing solution in the winter time is required.
(Pressure and Pressure Variation Adjusting Bolt) (Low and Hig Pressure Switc )
(3) Air Extraction Met od for t e Feed Water Pump
Open the air cock on the outlet of the feed water pump and extract the air until the
water is coming out strongly. Including air in the pipe, water feeding is not performed
smoothly and shorten the pump life due to impeller abrasion.
o, periodic air extraction must be performed.
* Note:
In the winter time, open the upper and lower air cock for exhausting the water in the
pump in the no load condition for about 5 seconds to remove the residue attached on
the impeller. When operation the pump manually, push the magnetic switch
of P.5 (7) using the screwdriver, and then operate it for 5 to 10 seconds.
(Feed water pump)
(4) Air Extraction Met od for t e Oil Heater(For Heavy Oil)
Operate the oil pump and open the air cock valve for air extraction until fuel oil is coming out strongly. Including the
air in the oil heater causes not to raise the oil pressure. o, periodic air extraction must be performed.
(5) Setting Met od for t e Oil Pump Pressure
The following values are the standards of the oil pump pressure:
Kerosene, light oil --------------------------15 Kg/cm2
Bunker-A oil, B oil, C oil --------------------20 Kg/cm2
The pressure adjusting of oil pump to one other than the standard pressure is to be used by a L-wrench and
screwdriver(-).

14
(6) Wiring Met od for t e Feed Water Pump and t e Oil Pump
(Feed Water Pump) (Oil Pump)
R T R T R T R T
| | | | | | | | | | | |
① ② ③ ① ② ③ Blue White Red Blue White Red
| | | | | |
⑥- ④ -⑤ ⑥ ④ ⑤ Yellow - Black - Green Yellow Black Green
(380V) (220V) (380V) (220V)
Note:
Rotating direction is to be checked after completion of wiring for the feed water pump and the oil pump.
(7) Adjusting Met od for t e capacity(Damper Blade)
* TYPE : DM-320-3
1) Cam Adjusting Met od for Control Position
① BLUE (L1) : Adjusting cam for “low over run” prevention.
② BROWN(L2) : Complete close position adjusting cam
③ GREEN (L3) : Position adjusting cam for 1st. solenoid valve
open and opening angle(Low fire angle position adjusting).
④ BLACK (L4) : Position adjusting cam for 1st. return(Returning
position adjusting from high fire to low fire).
⑤ YELLOW (L5) : Adjusting cam for 2nd. solenoid open position
(Position adjusting for 2nd solenoid valve opening movement).
⑥ RED (L6) : Position adjusting cam for 2nd. opening angle
(High fire opening angle position adjusting).
2) T e Wire Colors of t e Damper Motor
① Blue( 0), ②Green(R0), ③Black(OV1 In), ④Red(OV2 In)
⑤ White(OV2 Out), ⑩ Yellow(OV1 Out)
3) Adjusting Met od and Example of t e Damper Blade Angle
1. Cam Adjusting Method for Control Position
The cam is adjusted in the angle of L1<L2<L3<L4<L5<L6 and the damper is opened wider rotated
it clockwise.
2. Adjusting Example:
If you want to adjust at the damper angle of (3.0) when 1st. combustion and (6.5) when 2nd.
combustion, adjust as follows:

15
1) BLUE (L1) : et the cam position to “0” which is indicated on the cam shaft by manual.
2) BROWN (L2) : et the cam position to “1.0” which is indicated on the cam shaft by manual.
3) GREEN (L3) : et the cam position to “3.0” which is indicated on the cam shaft by manual
(1st low fire opening angle position adjusting).
4) BLACK (L4) : et the cam position to “3.2” which is indicated on the cam shaft by manual
( Position adjusting when returning from high fire to low fire).
5) YELLOW (L5) : et the cam position to “5.0”which is indicated on the cam shaft by manual
(Position adjusting for 2nd. solenoid valve opening movement).
6) RED (L6) : et the cam position to “6.5” which is indicated on the cam shaft by manual
(2nd high fire opening angle position adjusting cam).
* TYPE : DM-320-4
1) Cam Adjusting Met od for Control Position
① BLUE (L1) : Position adjusting cam for 2nd. Return.
(Returning position adjusting from high fire to middle fire).
② BROWN (L2) : Position adjusting cam for 2nd. opening angle.
(Middle fire opening angle position adjusting).
③ GREEN (L3) : Adjusting cam for 2nd. solenoid open position.
(Position adjusting for 2nd. solenoid valve opening movement).
④ BLACK (L4) : Position adjusting cam for 1st. opening angle.
(Low fire opening angle position adjusting).
⑤ YELLOW (L5) : Adjusting cam for 3rd. solenoid open position.
(Position adjusting for 3rd. solenoid valve opening movement).
⑥ RED (L6) : Position adjusting cam for 3rd. opening angle.
(High fire opening angle position adjusting).
2) T e Wire number of t e Damper Motor
(1) o, (6) Ro(open), GV1 In, (7) GV3 Out, (8) GV3 In, (13) GV2 Out, (14) GV2 In, (17) Ro(close)
3) Adjusting Met od and Example of t e Damper Blade Angle
1. Cam Adjusting Method for Control Position
The cam is adjusted in the angle of L4<L3<L2<L1<L5<L6 and the damper is opened wider rotated
it clockwise.
2. Adjusting Example:
If you want to adjust at the damper angle
1) BLACK (L4): et the cam position to “0.5~2.0” which is indicated on the cam shaft by manual.
(1st. low fire opening angle position adjusting).
2) GREEN (L3): et the cam position to “4.0” which is indicated on the cam shaft by manual.
(Position adjusting for 2nd. solenoid valve opening movement).

16
3) BROWN (L2) : et the cam position to “5.0” which is indicated on the cam shaft by manual
(2nd. middle fire opening angle position adjusting).
4) BLUE (L1): et the cam position to “5.3” which is indicated on the cam shaft by manual
( Position adjusting when returning from 3rd. high fire to 2nd. middle fire).
5) YELLOW (L5) : et the cam position to “6.0”which is indicated on the cam shaft by manual
(Position adjusting for 3rd. solenoid valve opening movement).
6) RED (L6) : et the cam position to “8.0” which is indicated on the cam shaft by manual
(3rd. high fire opening angle position adjusting cam).
Note:
Angle adjusting of the damper blade affects to the combustion condition and efficiency significantly and causes for
smoke. Do not adjust it at his discretion. Wrong direction is caused for smoke.
(8) Adjusting Met od for t e Water Level Device (BWC-3000L)
1) Direction for use
Water Level Control Conversion witch
This is a control device which has functions of water control,
concentration blowing-off and accumulation of combustion time.
[1] Combustion Time Check Conversion Mode
When pushing the conversion switch on the left side of the
water level unit, the LED lamp of the high fire, medium fire
and low fire are changed in sequence and the accumulated
combustion time is indicated on the monitor.
Ex) In case that the following indication are shown on the
monitor when pushing the conversion switch:
a) When the high fire[PH] lamp is lit up and [1][3] indication
is shown up on the monitor, total high fire operation time is
13 hours.
b) When the medium fire[PM] and the low fire[PL], the
indication is shown in the same method as the above.
[2] Water Level Control Conversion witch (BWC – 3000L)
This is a switch which has functions of 3 position water level control and 5 position water level
control located on the upper position of the left side, and the function is being able to converted each other.
[3] Three position control(0.5 - 1.5 T/H) - E1, E2, E3 water level detection
(E1 : High water level, E2 : Medium water level, E3 : Low water level).
[4] Five position control(2.0 - 3.0 T/H) - E1, E2, E3, E4, E5 water level detection
(E1 : High water level, E2 : Medium water level, E3 : Low water level, E4 : Forced water level,
E5 : afe water level).
When each water level detection lamp is lit up, current water level is indicated.

17
[5] PL, PM, PH
Indicates present combustion detection status of the water level unit.
* Low fire : PL lamp is lit up.
* Medium fire : PM lamp is lit up(2.0 - 3.0 T/H).
* High fire : PH lamp is lit up
[6] Concentration Blowing-off Adjusting Method
This equipment is used to keep the electric conductivity of water in boiler uniformly and protect water pipe
from accuring of carry over, scale and corrosion.
By using this equipment, boiler can supply more stabilized steam for a long time.
The setting value is 3.7 at the normal condition on the dial indication which is setting the concentrated water
density. (Electrical conduction setting value is 4500µs/cm2).
If resistance is over 4500µs/cm2 electric conductivity of water, solenoid valve opened automatically and
concentrated water in pipe is drained if resistance will be downed under 2500~3300µs/cm2, then solenoid
valve will be closed automatically
* Note:
1) The time indicated on the combustion time accumulation device is operated even in the power interruption by
the battery.
2) The battery is charged automatically when power on and can be used about 10,000 hours per one charge.
3) For time initiation(0000 hours, 00 minutes, 00 seconds), the reset switch inside is used.
(9) Concentration Blowing-off Device
This is a device for supplying high quality of
steam for prolonging the life of the boiler which
protects scales and carry over through blowing
off the boiler water automatically. When the
boiler water concentration is exceeded the
allowable range, the concentration blowing-off
sensor monitors it and its electrical signal is
flowed to the solenoid valve for blowing-off
following by open the valve and blow off the
concentrated water. When concentrated water
density is dropped down, the solenoid valve for
concentration water blowing-off is shut off and
stopped the exhausting the boiler water.
(Concentration Blowing-off Device)

18
(10) Operation status for combustion Control(Protect Relay
◀ Ⅱ ▲ Ⅱ P ⅡⅡ ■ ⅡⅡⅡ ▼ ⅡⅡ ▤1 Ⅲ ▤2 Ⅲ …… ⅢⅢ ◀
Ⅰ Ⅰ Ⅰ Ⅰ Ⅰ Ⅰ Ⅰ Ⅰ Ⅰ Ⅰ Ⅰ
① ② ③ ④ ⑤ ⑥ ⑦ ⑧ ⑨ ①
( Combustion Control Sequence)
1) Ignition Program Indication C art
① Manipulation start
② Damper open(Residual combustion gas exhaust)
③ Circuit check of the flame detector in the control
④ Damper close
⑤ Ignition transformer operation
⑥ 1st. combustion ignition
⑦ Ignition transformer operation stop
⑧ 2nd. combustion ignition
⑨ Normal operation (Protect Relay: Combustion Controller)
[a] - [b] Ignition time
[b] - [b’] Normal combustion
[b’] - [a] Post purge
← • → afe time in case of intermittent
pilot
← • • → afe time in case of interrupted
pilot

19
2) Indication Met od
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
uspected flame signal
▲
Damper open(to 2nd.
Combustion
position)
Combustion is
not performed
continuously
Limit switch open(short)
P
uspected 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 Met od
(1) C eck for Soft Water
The followings are to be checked for the boiler durability:
1) Feed water must be soft water.
2) oft 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 C eck)