Siemens LOA24.171B27 - 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 LOA24.171B27 Specifications

General

Brand	Siemens
Model	LOA24.171B27
Category	Controller
Language	English

Summary

Oil Burner Controls Overview

Product Description and Application

General description of LOA burner controls for supervision, startup, and control of oil burners.

Key Features and Use Cases

Safety and Handling Precautions

General Warning Notes

Critical safety warnings regarding operation, modification, and electrical hazards.

Mounting Safety Notes

Attention required for earthing and compliance with national safety regulations.

Installation and Electrical Guidance

General Installation Notes

Guidelines for high-voltage cables, connections, earthing, and fuse ratings.

Commissioning and Compliance

Commissioning Safety Checks

Essential safety checks for burner startup with flame detector under various conditions.

Product Type Summary

Model Specifications and Times

Table detailing article numbers, voltage, undervoltage detection, timing, and replacement types.

Technical Specifications

General Unit Data

Mains voltage, frequency, primary fuse, power consumption, and safety class.

Environmental Conditions

Specifications for storage, transport, and operation regarding climate and temperature.

Flame Supervision

QRC Detector Measurement

QRB Flame Supervision

QRB Detector Measurement

Operation and Fault Handling

Startup Preconditions

Fault Control Sequence

Behavior during undervoltage, mains failure, and loss of flame during operation.

Lockout and Reset Procedures

Details on lockout indication, manual reset, and state maintenance during power failures.

Connection and Control Diagrams

LOA24 Models Diagrams

LOA28;LOA25 Models Diagrams