Operating Cycle - Lamborghini Caloreclima EM 16/M-E Notice D'installation Et D'entretien

OPERATING CYCLE

Depending on the device with which air gate operation servo control is interlocked, the burner can operate in two different
modes: gradual two-stage, if the control unit is of the on/off type, continuous fl ame modulation if the device is of the
modulating type.
GRADUAL TWO-STAGE MODE
2nd stage
2˚stadio
1˚stadio 1st stage
ignition
avviam.
0
a
This is obtainable with a standard open/close (on/off) boiler thermostat (or pressure switch) so by means of the servo control,
the air gate operates in two positions: minimum (1st stage) or maximum opening (2nd stage).
We have gradual two-stage operation because the change from one to the other takes place gradually and smoothly.
From the illustrated diagram, the following characteristic sequences can be seen:
a) Stop sequence: with the burner stopped, the air gate is in closed position to prevent the air from entering and cooling
the combustion chamber of the boiler and fl ue.
b) Preventilation sequence: the air gate is in the fully open position with subsequent return to partially closed position
corresponding to the ignition delivery (with gas fl ow always closed).
c) Ignition fl ame formation sequence: the electronic gas valve coils are energized and the gas regulator is partially open
according to the pressure of the ignition air.
d) Main fl ame or second stage switchover sequence: the servo control commands opening of the air (up to maximum
delivery setting) and the increase in pressure causes a gradual increase in gas fl ow.
e) Maximum delivery to fi rst stage switchover sequence: the boiler thermostat/pressure switch (regulator) acts on the
servo control thus closing the air.
CONTINUOUS MODULATION MODE
ignition
min. ignition 30%
This mode is obtained by sending an appropriate signal to the air gate servo control so that power supplied by the burner
can be of any intermediate value between a preset minimum and maximum. Continuous modulation is required when boiler
water temperature or steam pressure must be kept within restricted limits. From the diagram, it will be seen that the stop,
preventilation, fl ame formation or switchover to maximum output phases are the same as those described in the previous
paragraph. Actual fl ame modulation is obtained by fi tting the following devices to the system. These are supplied with an
optional kit:
- LANDIS boiler probe, for temperature or pressure.
- LANDIS RWF 32 regulator with mounted case panel.
- Range adapter for regulator, controlled by the boiler probe, with calibration suitable
for the probe scale.
AIR
ARIA
GAS
e
b c d
AIR
Modulation mode
- 37
1 sec. max
operation
time
-
tempo
time
a