CONTROL BOX LOA 24.171 B27

RL 22-32 BLUBUrners TRAining CEntre


CONTROL BOX LOA 24.171 B27

FEATURES:

# Electrical protection IP 40

# Electrical polarity must be respected# Flame signals: operation reliable value min 70µA

max operation value 110µAat beginning max value 5.5µA

# Nominal el. supply 220 -15%+10% VAC# Under voltage: 165 VAC


Control program in the event of fault:

If a fault occurs, the supply of fuel is immediately interrupted.With every lockout, the control outputs will be de-energized in less than one second, while terminal 10 (AL) for the remote indication of lockout receives voltage. The LOA24 can be reset no earlier than 50 seconds after lockout.

Extraneous light /premature flame signal

During the pre-purge time, no flame signal may be present. If, however, a signal is delivered during this period of time, the LOA24 locks out on expiry of the pre-purge and safety time. Under these circumstances, the oil valve does not open.An erroneous flame signal can be caused, for instance, by:– premature establishment of flame due to a leaking oil valve– extraneous light– a short-circuit in the detector or its wiring– faults in the flame signal amplifier, or similar

Non-appearance of flame

If, at the end of the safety time, there is no flame signal, the LOA24 will immediatelylock out.



Flame failure during operation

On flame failure during operation, the LOA24 will immediately shut down the fuelsupply and automatically recycle (restart attempts).If flame failure occurs on completion of «t4» (15”sec from the establishment of the flame), almost the complete startup sequence will be restarted.

Undervoltage detection

With burner controls featuring undervoltage detection, an additional electronic circuitensures that in the event of mains voltages below about 165 V, burner startup will beprevented, or - without opening the oil valve - the burner control locks out.

Indications

The fault position is indicated by the lamp integrated in the reset button.



II

IV

I (0°)II (50°)III (40°)IV-V (30°)

I0 3 0

II0 3 0

III0 3 0

IV-V0 3 0

IIIIV

FEATURES:# Rotation angle 90°# Rotation time 4.5”# Nominal Torque 0.8 Nm

# Operating current 6 A

SERVOMOTOR

STA 4,5 B 0.37/6


SERVOMOTOR Cam I: Set to 0° (air damper closed in shut-down position)To open partially, increase this setting.

Cam II: Factory set to 50°.Controls the position of the air damper at the 2nd stage - it follows the servomotor only when opening.To reduce the angle, go to the 1st stage, reduce the angle, and return to 2nd stage to check the effect of your adjustment.

Cam III: Factory set to 40°.Enables the 2nd stage valve. Set it between cams IV-V, so that it always anticipates cam II.

Cam IV-V: Factory set to 30°(V anticipates a bit IV to win the isteresis phoenomena).Controls the position of the 1st stage and must always anticipate cams II and III. It follows the servomotor only when closing. To increase the angle, go to the 2nd stage, increase the setting angle, and return to 1st stage to check the effect of your adjustment.

NOTE: If you increase the angle from the 1st stage position while the burner is operating, theburner will stop.

SERVOMOTOR

STA 4,5 B 0.37/6


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3

NT1T2S3B4 L1 T7 B5T6T8

I1 I 1-2

TA

VSVH/L


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

1IGNITION PROCEDURE: 0”

Switch ON main supply


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L


On the servomotor,a relay is energised first


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L


The servomotorbegins to open


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L



TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

5IGNITION PROCEDURE: 1.5”

The servomotorstops at a value a bit higher than

low flame position


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M


I1 I 1-2

TA

VSVH/L

6

1 2 3

IGNITION PROCEDURE: 1.5”

The control box begins its cycle,as energised at # 1

Immediately (if no lock out occured) there are two output: # 8 and, throughtout # 3,

# 6


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

7IGNITION PROCEDURE: 1.5”PRE-PURGE


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

8IGNITION PROCEDURE: 1.5”PRE-PURGE


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

9IGNITION PROCEDURE: 1.5÷2”PRE-PURGE

The servomotor goes back a bitto avoid the isteresis phoenomena


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

10

The servomotor goes back a bitto avoid the isteresis phoenomena

IGNITION PROCEDURE: 1.5÷2”PRE-PURGE


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

11IGNITION PROCEDURE: 1.5÷2”PRE-PURGE


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

12IGNITION PROCEDURE: ~15”IGNITION

The control box suppliesthe safety valve


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

13

The flame must be detectedby 10 secs

IGNITION PROCEDURE: ~15”IGNITION


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

14IGNITION PROCEDURE: ~30”1st =>2° STAGE

An internal contact of the boxchanges from # 6 to # 5


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L


On the servomotor,a relay is energised


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L


The servomotoropens


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

17IGNITION PROCEDURE: ~30...”1st =>2° STAGE


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

18

Cam III energises V H/L

IGNITION PROCEDURE: ~30...”1st =>2° STAGE


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

19IGNITION PROCEDURE: ~30...”1st =>2° STAGE


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

20

The servomotor stops at 50°

IGNITION PROCEDURE: ~30...”1st =>2° STAGE


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

21HIGH FLAME


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

22HIGH FLAME => LOW FLAME


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L



TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L



TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L



TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L



TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L



TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

28LOW FLAME


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L

29LOW FLAME => STAND-BY


TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L



TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L



TH/L

N L

TS

TR

4 53912 6 7 8

III II

M I

IV V

413 6 N10 N32 52 1211 8N

M

1 2 3


I1 I 1-2

TA

VSVH/L


Documents

CONTROL BOX LOA 24.171 B27