Product handbook [PDF] (16 pages)
- Updated: 04.05.2026
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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
EN2R-9053 0408R11-NE
2
DESCRIPTION
The Combined Valve Boiler Control (CVBC) is the
combination of a VK41.. modulating or non-modulating gas
control with an electronic boiler control.
The boiler control consists of an automatic ignition control and
a comfort boiler control.
Most of the standard control functions of a gas fired boiler can
be performed within one single control box which can easily be
clicked on the gas control.
Possible applications are:
• Instantaneous water heaters.
• Floor standing boilers.
• Combi boilers.
• Low Nox boilers.
• Condensing boilers.
• See chapter Features for the standard features which can
be implemented in this control box.
ALARM
RESET
3
EN2R-9053 0408R11-NE
FEATURES
• Multi trial full sequence ignition control.
• Permanent operation in accordance with EN 298 (2003).
• Non volatile lock-out.
• Self learning ignition sequence; no minimum adjustment,
using LOCON.
• Direct Burner- or Intermittent Pilot operation.
• Integral ignition including emission filter.
• Combined ignition and flame sensing option.
• Phase insensitive flame detection.
• Lock-out at flame simulation.
• Restart after flame loss.
• AC or DC fan control (24 VDC fan needs external trafo).
• Dynamic airflow check.
• Lock-out on no air.
• Automatic fan assisted/atmospheric recognition.
• Integral gas pressure modulation circuitry.
• Pump control.
• 3-way valve control.
• Multi temperature CH and DHW control with DHW priority
setting.
• ∆T control in CH mode
• Flow sensor input for DHW detection and control
• Sensor- or contact switch high limit at control.
• Communication to MMI enabling comprehensive
diagnostics and operation.
• Factory safety parameter settings.
• Installer and OEM comfort boiler control parameter
settings.
• On board transformer and wiring center.
• Integral and/or remote reset and alarm indicator.
• Electrical safety in accordance with EN 60730-1 (2000).
• Replacable fuse
• OpenTherm communication
EN2R-9053 0408R11-NE
4
DIMENSIONAL DRAWING S4965 BOILER CONTROL
Molex Minifit (for X1) and Microfit (for X11 and X12) can be
used as alternatives
Dimension cover
110
115
120
117
82
64
46
17
12
61
14
33
24
16
1
6
3
1 1
8
9
16
18
1
5
10
X11
X12
X1
Material : ABS - V0
Tolerances ± 1 mm
unless noted
FOR CONNECTORS, USE FEMALE PARTS
Plastic part
Pins
Terminal
X1
TYCO 1-106527-0
10
TYCO 106528-2 (reel)
(for AWG 22-26, insulation
diameter 1,20 - 1,75 mm)
X11
TYCO 794617-6
6
TYCO 794607 (reel)
TYCO 794611
(for AWG 26-30)
X12
TYCO 1-794617-6
16
X12
TYCO 1-794617-8
18
6,6 ± 0,4
3,3 ± 0,3
68,1 ±0,3
33,4
74,65
48,2
Material : ABS - V0
Tolerances ± 1 mm
unless noted
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