baltur COMIST 36 Instrucciones página 60

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 val-
ve. The piston moves against a sealed
joint inserted into the cylinder; in turn,
this joint hydraulically separates the
intake chamber from the delivery cham-
ber. The piston transmits the stroke
directly to the valve.
A = Driver identification plate
B = Flow direction indicator
C = Valve body identification plate
SUGGESTIONS FOR SETTING
1) We therefore advise you to prepare the burner for igni-
tion by setting screw V1 (regulating the gas flow to the 1
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.
2) Second flame. Set V2 in the position where the gas
flow required for the 2
nd
the position at which V is set (the distance between
the microswitch control lever and the microswitch
push-button) must be greater than that set for V1.
A disk is secured to the valve shaft and
can be seen through a slit in the valve,
indicating the stroke. Through an oscil-
lating 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 compres-
ses the closure return spring with the
rod and plate. When the valve reaches
the first stage, a disk connected to the
flame is obtained. Obviously,
0006080093_00709
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.
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 magnetic valve
opens and the valve will remain open
until the piston reaches the 1
position. If regulation is shut down be-
cause 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
the screw in terminal I (V1) with a
screwdriver.
To set gas flow to the 2
the screw in terminal III (V) with a
screwdriver.
In both cases, tightening the screw
increases gas flow, unscrewing it de-
creases 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.
st
Microswitch push-button for valve 1
Microswitch control lever for valve 1
Screw setting the opening for the valve 1
60 / 139
N° 8881
Rev. 06/11/90
st
stage
flame, turn
st
flame, turn
nd
st stage
st
stage
st
stage (V1)