Siemens LOA26.171B27 - User Manual

44 ซ.บรมราชชนนี 70 ถ.บรมราชชนนี ศาลาธรรมสพน์ ทวีวัฒนา กทม. 10170.
website: https://www.add-furnace.com/ โทร: 02-888-3472
Line ID: @add11 Wechat ID: add0883001122
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 LOA26.171B27 Specifications

General

Manufacturer	Siemens
Model Number	LOA26.171B27
Type	LOA26
Voltage	220-240 V
Frequency	50-60 Hz
Product Type	Controller
Category	Controller

Summary

Oil Burner Controls

Use of LOA... Controls

Application of LOA... controls for 1- or 2-stage forced draft oil burners.

General Features of LOA... Controls

Supervision of yellow-burning and blue-burning flames with detectors.

Specific Features of LOA... Controls

Safety and Warning Notes

General Warning Instructions

Mandatory safety precautions for installation, wiring, and operation to prevent injury.

Mounting Compliance

Ensuring adherence to national safety regulations for burner control installation.

Installation Guidelines

High-Voltage Cable Handling

Electrical Wiring and Grounding

Ensuring correct connection of conductors and proper earthing for safety.

Flame Detector Cable Installation

Commissioning and Certification

Commissioning Safety Checks

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

Standards and Directives Compliance

Product Lifecycle and Design

Undervoltage Protection

How the control prevents startup or causes lockout during mains voltage drops.

Product Type Summary

LOA... Type Specifications

Summary of different LOA... types, voltages, and timing parameters.

Technical Data

General Unit Specifications

Specifications like mains voltage, frequency, power consumption, and protection class.

Permissible Current Ratings

Table detailing current limits for various terminals across different LOA... types.

Flame Supervision with QRC...

QRC... Measuring Circuits

Flame Supervision with QRB...

QRB... Measuring Circuits

Function and Control Sequence

Startup Conditions and Fault Handling

Startup preconditions, undervoltage protection, fault responses, and lockout procedures.

Connection and Control Diagrams

LOA24... Internal Diagrams and Sequences

LOA25;LOA28... Internal Diagrams and Sequences