• All activities (mounting, installation and service work, etc.) must be performed by qualified staff
• Check to ensure that the impulse pipes are properly fitted and tight
• Fall or shock can adversely affect the safety functions. Such actuators must not be put into
operation, even if they do not exhibit any damage.
• If mains voltage is fed to the end switch via the second plug-in space, protective earth must be
connected to the actuator via the same plug.
• Use of connectors conforming to DIN EN 175301-803-A is mandatory
• The connectors used must have cable strain relief
• The pump’s stem must not be pulled out using the overstroke element since that part could
become loose.
If the available gas pressure exceeds the maximum permissible operating pressure of the valve /
SKP..., it must be lowered by an upstream pressure controller. The pressure switch for lack of gas
must always be fitted upstream of the gas valve when used in connection with the SKP… The
inside diameter of the impulse pipes must be a minimum of 6 mm. The impulse pipes must be
installed such that the differential pressure can be acquired with no disturbance (unfavourable flow
conditions). Pressure test points must not protrude and be flush with the inside diameter of the pipe
or duct wall. The impulse lines to the governor / controller should be as short as possible, enabling
the governor / controller to respond quickly should sudden load changes occur.
• Installation of impulse pipes
In the case of unsafe combustion chamber pressure pipes (e.g. resulting from potential leaks), the
setting must also be checked during operation without having the combustion chamber pipe
connected, especially with respect to maximum burner capacity. The impulse pipes must be fitted
such that the differential pressure can be acquired with no disturbance. With gas / air ratios > 3, the
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