Honeywell S4965 Series User Manual

PRODUCT HANDBOOK
1 EN2R-9053 0408R11-NE
Subject to change without notice. All rights reserved.
S4965 SERIES
COMBINED VALVE AND BOILER CONTROL SYSTEMS
APPLICATION
The S4965 boiler controls have been developed for application
in gas fired domestic appliances.
The S4965 boiler controls are used in conjuction with the
VK41.. series modulating or non modulating gas controls. (see
Product Handbook EN2R-9025 and EN2R-9004) They provide
both an optimised safety sub-system for programmed safe
light-up and flame supervision of the main burner of the
appliance and a boiler comfort control sub system for
temperature, pump, and 3-way valve control
Bi-directional communication with a MMI enables
comprehensive diagnostics and operation.
For glossary of terms, abbrevations and symbols see
document EN2R-9039
Contents
General
Description ......................................................................... 2
Features ............................................................................ 3
Dimensional drawing S4965 boiler control ........................ 4
Technical
Specifications .................................................................... 5
Connection diagram .......................................................... 7
Timing diagram ................................................................ 8
Description of LOCON ...................................................... 9
Description of SQUARE ................................................... 10
General considerations ................................................... 11
Electrical connections and wiring .................................... 12
Adjustments and final checkout ...................................... 13
Various
EMC guidelines ............................................................... 14
Quality assurance statement ........................................... 15
Standards and approvals ................................................ 15
Ordering information ....................................................... 16

Honeywell S4965 Series Specifications

General

Frequency	50/60 Hz
Enclosure Rating	NEMA 1
Application	Gas-fired appliances
Type	Flame safeguard control
Ignition Trial Time	10 seconds
Humidity Range	95% RH non-condensing
Terminals	Screw terminals

Summary

APPLICATION

DESCRIPTION

FEATURES

DIMENSIONAL DRAWING S4965 BOILER CONTROL

SPECIFICATIONS

Electrical PCB connectors

Details on electrical connections for PCB components including spark, flame sensing, mains, and low voltage.

Flame sensing

Parameters for flame sensing, including minimum current and response times.

Ignition

Technical specifications for the ignition system, including voltage, frequency, and energy.

Timing

Timing parameters for various stages of boiler operation like pre-purge, ignition, and post-purge.

Communication

Cable and wiring length

Remote reset

Tolerances and product life

CONNECTION DIAGRAM

TIMING DIAGRAM

DESCRIPTION OF LOCON

DESCRIPTION OF SQUARE TECHNOLOGY

GENERAL CONSIDERATIONS

ELECTRICAL CONNECTIONS AND WIRING

Wiring

Guidelines for proper wiring practices, leadwire selection, and insulation requirements.

Fusing

Information on external and integrated fusing for the boiler control, including mounting/demounting.

Spark gap

Specification for the maximum allowable spark gap for optimal ignition.

ADJUSTMENTS AND FINAL CHECKOUT

Checking flame current

Procedure for checking flame current using a DC micro-Ampèremeter.

Final checkout

Ensuring all burner components function correctly after installation and adjustments.

Maintenance and service

States that no maintenance or service is required under normal circumstances.

Adjustment of gas pressure

Details on adjusting gas pressure using a PC tool and OS-specific instructions.

EMC GUIDELINES

QUALITY ASSURANCE STATEMENT

STANDARDS AND APPROVALS

Standards

Lists European standards the S4965 is designed to meet, including EN 298 and EN 60730-1.

Approvals

Confirms conformity with EC Directives like Gas Appliance, Low Voltage, and EMC.

ORDERING INFORMATION