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ENGLISH
INSTRUCTIONS FOR SETTING LANDIS & GYR
MOD. SKP 10.123A27 TWO STAGE GAS VALVES
DESCRIPTION OF HOW THE VALVE OPERATES
Servomotor
The hydraulic control system consists of a cylinder filled with oil and
an oscillating pump with thrust piston. There is also a solenoid
valve located between the intake chamber and the pump thrust
chamber which serves to close the valve. The piston moves against
a sealed joint inserted into the cylinder; in turn, this joint hydraulically
separates the intake chamber from the delivery chamber. The piston
transmits the stroke directly to the valve.
A disk is secured to the valve shaft and can be seen through a slit
in the valve, indicating the stroke. Through an oscillating system
this disk simultaneously activates the limit switch contacts for the
partial and nominal output positions.
Two - stage operation
When the valve receives the signal to open, the pump cuts in and the
magnetic valve closes. The pump transfers the oil under the piston
to above it, forcing the piston downward, which compresses the
closure return spring with the rod and plate. When the valve reaches
the first stage, a disk connected to the shaft activates contact “V1”
by means of an oscillating system. As a result, the pump cuts out
and the valve remains in the first-stage position.
A
= Driver identification plate
B
= Flow direction indicator
C
= Valve body identification plate
Microswitch push-button for valve 1
st
stage
Screw setting the opening for the valve 1
st
stage (V1)
Microswitch control lever for valve 1
st
stage
The pump begins functioning again only when terminal 3 is powered
either from the control panel or directly by the power regulator. The
full load stroke terminates when the contact is tripped and the pump
cuts out.
If the power regulator cuts off power supply to terminal 3, the ma-
gnetic valve opens and the valve will remain open until the piston
reaches the 1
st
stage position. If regulation is shut down because
the power supply has been cut off, terminals 1 and 3 are no longer
powered - this causes the servocontrol to close the valve in less
than 1 second.
Remove cover “A” to access the gas regulation screws.
To set gas flow to the 1
st
flame, turn the screw in terminal I (V1)
with a screwdriver.
To set gas flow to the 2
nd
flame, turn the screw in terminal III (V2)
with a screwdriver.
In both cases, tightening the screw increases gas flow, unscrewing
it decreases the flow.
Screw “D” in terminal “IV” regulates the position at which the “clean”
contact is activated. This can be used for an outside signal.
SUGGESTIONS FOR SETTING
• We therefore advise you to prepare the burner for ignition by
setting screw V1 (regulating the gas flow to the 1
st
flame) so
that the distance between the control lever and the microswitch
push-button does not exceed 1 mm (see the figure below). Set
the combustion air gate in a highly closed position.
• Second flame. Set V2 in the position where the gas flow required
for the 2
nd
flame is obtained. Obviously, the position at which V2
is set (the distance between the microswitch control lever and the
microswitch push-button) must be greater than that set for V1.
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