Siemens LOA24.171B17 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 LOA24.171B17 Specifications

General

Category	Controller
Manufacturer	Siemens
Brand	Siemens
Voltage	220-240 V
Frequency	50-60 Hz
Mounting Type	Base mounting
Type	Oil Burner Control
Application	Oil Burners
Input Voltage	220-240 V

Summary

Siemens Oil Burner Controls Introduction

LOA Series Application Overview

Details the application of LOA... for startup, supervision and control of oil burners.

Critical Safety Warnings

General Operational Safety

Mandatory safety notes to avoid injury, property damage, or environmental harm.

Installation and Grounding Safety

Ensures correct grounding and compliance with national safety regulations for safe installation.

Installation and Wiring Best Practices

General Installation Guidelines

Flame Detector Wiring Recommendations

Commissioning Procedures and Compliance

Mandatory Commissioning Checks

Essential safety checks during commissioning, maintenance, or after long off-periods.

Product Standards and Certifications

Details applied directives, standards, and conformity marks for the burner controls.

Product Lifecycle and Design Details

Undervoltage Protection Circuit

Explains the circuit that prevents startup or initiates lockout on low mains voltage.

Test Adapter Tools

Technical Specifications Summary

General Unit Data and Ratings

Environmental Condition Ratings

QRC Blue-Flame Detection

QRC Detector Current Specifications

QRC Measurement Circuit Diagram

QRB Yellow-Flame Detection

QRB Detector Current Specifications

QRB Measurement Circuit Diagram

LOA36 Flame Strength Indicator LED

Burner Control Operational Logic

Startup Sequence Preconditions

Required input signals for burner control startup sequence.

Fault, Lockout, and Reset Procedures

Details undervoltage behavior, fault sequence, lockout causes, and reset procedures.

Status Indicators and Operation

Explains lockout position, flame strength LED, and preheater status LED.