pag.5
LB1292
MULTIFLAM 500.1 PR - 600.1 PR
techniques for energy saving
LANDIS & STAEFA SQM 50.381A2 AIR DAMPER MOTOR
Remove cover to gain access to the adjusting cams.The cams are to be adjusted through the suitable key provided
for. Description:
R
Q
T
P
DUNGS SV-DLE
To adjustment gas output, loosen the screw R and turn the knob P as required. To reduce output, turn knob
clockwise, to increase it turn knob counterclockwise. Tighten the screw R. For fast opening adjustment, remove the
cap T and insert it in the pin Q with its groove up. To reduce firing output screw it up, to increase, unscrew it.
LEAKAGE CONTROL DEVICE DUNGS VPS 504-VDK 200
When the thermostats are closed, the gas leakage control device checks the valve seals by pressurizing the circuit
between the two gas valves. When test pressure is reached the device remains in stand-by for about 25 seconds. At
the end of the test the yellow pilot light on the control device lights up and the burner is enabled to carry out the
start-up cycle. If the seal on one of the valves is faulty and this causes a drop in test pressure, the device puts the
system into the safety condition and the red pilot right on the device lights up. The flame
control device starts the burner fan to carry out prewashing of the combustion
chamber,checking fan air pressure via the air pressure switch. After preventilation the ignition
transformer starts operating, generating a spark between the electrodes and simultaneously the
gas valves open (safety gas valve VS and first stage operating valve VL). If the flame does not
ignite or goes out, total safety is ensured by an ionization detection probe. The safety time
limit in the event of no flame is less than 2 seconds at start-up and less than 1 during operation. In the event of no
gas being supplied or of a considerable drop in pressure the minimum gas pressure switch interrupts burner opera-
tion. About 20/30 seconds after ignition the flame control device commands operation of the second stage via the
gas valve and air servocontrol, thus taking the burner to maximum power.
VL
VS
DISPOSITIVO
CONTROLLO
TENUTA
LEAKAGE
CONTROL
DEVICE
I
- High flame operating opening position adjusting cam (Heavy-Oil /Gas)
II
- Ignition flame opening position adjusting cam (Gas).
III
- Low flame operating opening position adjusting cam (Gas)
IV
- Ignition flame opening position adjusting cam(Heavy-Oil)
V
- Low flame operating opening position adjusting cam (Heavy-Oil)
VI
- Not used cam
VII
- Not used cam
VIII
- Not used cam
Manual change
