LOA24.171B17 View Datasheet(PDF) - Siemens AG

Part Name

Description

Manufacturer

LOA24.171B17

LOA24.171B27 - Oil burner control

Siemens AG 

Function

Preconditions for

startup

Undervoltage detection

Control sequence in the

event of fault

Reset

Indications

Lockout position

Flame strength

Operation

· Burner control is reset

· Contacts in the line are closed

· No undervoltage

· Flame detector is darkened, no extraneous light

An additional electronic circuit ensures that if mains voltage drops below approximately

AC 165 V, burner startup will be prevented, or – without release of oil – lockout will be

triggered.

Whenever lockout occurs, the outputs for the fuel valves, the burner motor, oil prehea-

ter and ignition equipment will immediately be deactivated (< 1 second).

The lockout indication lamp changes to red and terminal 10 («AL») for remote lockout

indication receives voltage.

This state is also maintained in the event of mains voltage failure.

Cause

Mains voltage failure

Extraneous light on burner startup

No flame at the end of «TSA»

Loss of flame during operation

Response

New start

Lockout; with LOA25... / LOA28...: Preven-

tion of start

Lockout

Repetition

After lockout, the burner control can be reset after 60...90 seconds (also refer to

«Warning notes»).

The lockout position is indicated with the lamp integrated in the lockout reset button.

Only with LOA36...

Indication of the flame strength (green LED) is used for checking the flame signal.

To ensure reliable burner operation, this LED must be lit.

If the green LED flickers or extinguishes during burner operation, the light conditions at

the burner are poor, caused by dirt for instance.

Only with LOA36...

When the contacts of the control thermostat are closed, the orange LED is lit, indicating

the start of the oil preheater’s heating up phase (if present).

Siemens Building Technologies

HVAC Products

7/10

CC1N7118en

09.10.2002

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