Honeywell Krom Schroder PFU 780 User Manual

6 Edition 02.12l
Industrial & Commercial Thermal
AGA
Technical Information · GB
Burner control unit PFU 780
• For pilot and main burners of unlimited capacity in
thermoprocessing equipment pursuant to EN 7462
• Separate flame control for pilot burner and main burner by UV,
ionisation or a further option of using the furnace chamber
temperature
• Display of the program status, unit parameters and flame signal;
Manual mode for burner adjustment and for diagnostic purposes

Honeywell Krom Schroder PFU 780 Specifications

General

Gas Type	Natural gas, LPG
Output Type	Relay
Frequency	50-60 Hz
Operating Temperature	-20 to +60 °C
Relative Humidity	< 95% (non-condensing)

Summary

Application

Examples of Application

Details on various application examples for the PFU 780 burner control unit.

Certification

Certifications and Approvals

Overview of SIL, PL, EC type-tested, and FM approvals for the PFU 780.

Function

Connection Diagrams

Wiring diagrams for PFU 780 and PFU 780..K2 burner control units.

Program Sequence

Detailed step-by-step program sequence for burner start-up and operation.

Program Status and Fault Messages

Explanation of display codes for program status and fault messages.

Parameters

Parameter Overview and Scanning

Introduction to parameters and how to scan them, with a summary table.

Flame Control and Monitoring

Parameters for flame signal, control, and monitoring of pilot and main burners.

Start-up and Operation Behaviour

Parameters defining behaviour during start-up and operation phases.

Air Valve and Manual Operation

Parameters for air valve control and manual operation modes.

Selection

Calculating Safety Time

Guidance on calculating safety time (tsA) according to EN 746-2.

Type Code Selection

Selection table and explanation of type codes for PFU 780 variants.

Project Planning Information

Cable Selection Guidelines

Recommendations for selecting and routing ignition, ionisation, and UV cables.

Safety Interlocks and Emergency Stop

Information on safety interlocks, limits, and emergency stop procedures.

Installation and Wiring

Guidelines for installing and wiring the PFU 780 unit.

Flame Control

Ionisation Sensor Control

How flame control works using an ionisation sensor.

UV Sensor Control

How flame control works using a UV sensor.

High Temperature Equipment Control

Flame control methods for high-temperature applications.

Accessories

High-Voltage Cables and BCSoft

Description of high-voltage cables and BCSoft software/optocoupler.

Module Subracks

Overview of different module subracks for PFU 780 and other units.

Power Supply and Relay Module

Details on the PFP 700 power supply and PFR 704 relay module.

Technical Data

Safety-Specific Characteristic Values

Safety-related values, PL/SIL relationship, and service life.

Operating Controls Overview

Identification and function of the PFU 780's operating controls and indicators.

Maintenance Cycles

Servicing Requirements

Information on the low servicing requirements of the PFU burner control unit.

Legend

Symbols and Timing Definitions

Explanation of symbols and timing notations used in diagrams and text.

Glossary

Waiting Time and Safety Time

Definitions of waiting time (tw) and safety time on start-up (tsA).

Ignition and Flame Simulation Times

Definitions of ignition time (tz) and flame simulation delay time (tLv).