Siemens LOA24.173A27 User Manual

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7118
LOA2... LOA3...
Oil Burner Controls LOA2...
LOA3...
Oil burner controls for the supervision, startup and control of 1- or 2-stage forced
draft oil burners in intermittent operation. Oil throughput of less than 30 kg/h.
The LOA2... / LOA3... and this Data Sheet are intended for use by OEMs which
integrate the oil burner controls in their products.
Use, features
Use
General features
Specific features
CC1N7118en
19.05.2016
The LOA... are used for the startup, supervision and control of 1- or 2-stage forced draft
oil burners in intermittent operation.
Yellow-burning flames are supervised with photoresistive detectors QRB..., blue-
burning flames with blue-flame detectors QRC...
 Applications in accordance with EN 267: Automatic forced draft burners for liquid
fuels
 Type-tested and approved in accordance with DIN EN 230:1991
- Undervoltage detection
- Bridging contact for oil preheater (not with LOA28.173A27)
- Special versions including models for incinerator plants and flash-steam generators
- LOA36... with color display of flame intensity and operating

Note!
Donot use for new designs.
Building Technologies Division

Siemens LOA24.173A27 Specifications

General

Brand	Siemens
Model	LOA24.173A27
Category	Controller
Language	English

Summary

Use and Features of Oil Burner Controls

Use of LOA Burner Controls

Describes the application of LOA... controls for 1- or 2-stage forced draft oil burners.

Test Adapters for Burner Controls

Test Adapter KF8833

Used for checking burner control functions, with signal lamps and jacks.

Test Adapter KF8840

Used for checking burner control functions, with signal lamps, switches, and jacks.

Test Adapter KF8885

Technical Data for General Unit

General Unit Data

Provides mains voltage, frequency, power consumption, safety class, and input current.

Flame Supervision Circuits

QRC Blue-Flame Detector Supervision

QRB Flame Detector Supervision

Function and Control Sequence

Function and Startup Preconditions

Outlines required signals for burner startup and safety preconditions.

Control Sequence in Event of Fault

Details responses to faults like voltage failure, extraneous light, or loss of flame.

Indications and Operation

Connection Diagrams and Control Sequences

LOA24 Connection and Control

LOA28/LOA25 Connection and Control

Detailed Control Diagrams

LOA26 with Remote Lockout Reset

LOA36 with Remote Lockout Reset