Operating Instructions For TD/TAD4 Dual Fuel Burner
June 13 147 of 165 TD/TAD4 Manual Rev 4
impulse pipes for the combustion air and the combustion chamber pressure must have an inside
diameter of at least 8 mm. The impulse pipe for the combustion chamber pressure must be fitted
such that the gases will cool down in the vicinity of the impulse pipe and condensing gases cannot
enter the controller but will return to the combustion chamber.
Recommendations:
– The gas pressure should be acquired at a distance of 5 times the nominal pipe size downstream
from the valve.
– Do not use the lateral test points on the VG... valve body for picking up the pressure
• Considering the combustion chamber pressure
If the resistance value of the combustion chamber / heat exchanger / stack system is constant, the
combustion chamber pressure changes in proportion to the gas and combustion air pressure as the
burner’s output changes. In that case, the combustion chamber pressure need not be fed to the
SKP75... as a disturbance variable. However, if the combustion chamber pressure does not change
to the same extent as the gas and air pressure – as this is the case in plants with flue gas fan or
modulating flue gas damper – the combustion chamber pressure must be fed to the SKP75... as a
disturbance variable, enabling the controller to counteract.
• Ensure that the relevant national safety regulations are complied with
• The quadratic arrangement of the fixing holes allows the actuator to be fitted in 4 different
positions, each step being 90°
• The actuator can be mounted or replaced while the system is under pressure; sealing
materials are not required
• Electrical commissioning may only be performed when the SKP… is fitted to the valve;
otherwise, the SKP… can be damaged.
• Power is supplied and connection of the end switch is made directly via a connecting cable
(conforming to DIN EN 175301-803-A)
• The end switch is factory set.
When power is applied, the pump will be activated and the control valve closed. Oil is now pumped
from the chamber below the piston to the pressure chamber above the piston. The oil pressure
causes the piston to move downward, thereby opening the valve – against the pressure of the
closing spring. The pump remains energized until the closing command is given. When power is
removed, or in the event of a power failure, the pump will be deactivated and the control valve
opened so that the closing spring pushes the piston back. The return flow system is sized such that
the counterstroke required for reaching the fully closed position is completed within about 0.6
seconds.
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