13 EN2R-9053 0408R11-NE
ADJUSTMENTS AND FINAL CHECKOUT
WARNING
Adjustments must be made by qualified persons only.
If the appliance manufacturer supplies checkout and/ or
service and maintenance instructions carefully follow
them. If these instructions are not provided then use the
procedure outlined below.
Checking flame current
• The minimum value should be in accordance with specified
value.
• To check flame current connect a DC micro-Ampèremeter
between flame sensing wire and flame sensing rod.
Short micro-Ampèremeter during ignition to prevent
damage of the micro-Ampèremeter in single rod
applications.
• Meter connections polluted with e.g. alkaline substances
lying close to earth can cause flame current simulation.
Make sure no false flame current can flow from meter
connections to earth.
• If flame current is insufficient check that the flame sensing
rod is fully enveloped by the flame and that the burner and
the boiler control are reliable grounded.
Final checkout
After installation and any adjustment start the appliance and
observe a complete cycle to ensure that all burner
components function correctly.
Maintenance and service
Under normal circumstances no maintenance or service is
required.
Adjustment of gas pressure.
• The gas pressure can be adjusted after the S4965
automatic ignition control has been mounted on the
VK4100/VK4105 gas valve.
• Depending on the O.S. number the different values of the
gas pressure must be adjusted.
• Adjustments can be executed with the help of a PC tool and
a communication link between the S4965 and the PC tool.
• Adjustment is described in an O.S. number specific
instruction sheet.
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