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STCS ed 07/02 CAESAR Star
Technical Documentation
Technical Documentation
Enables the ignition circuit of the board to detect the presence of a flame on
the burner. If this does not operate, the no ignition lock trips, signalled by the
lighting up of red LED H2.
Any operation prior to burner ignition is indicated by the flashing of red LED
H2.
Ignition/Detection
electrode
(E1)
Inputs.
Integrated in a single device.
- an On/Off switch that permits powering the board and resetting after a safety
device has tripped.
- a potentiometer which only when in “ON” position permits adjustment of the
water temperature between 40° and 60°C.
Master switch
(d.h.w. adjustment)
(S4)
This provides power to the gas valve when fan operation
ensures correct fume extraction.
If this is closed with the fan off, it does not enable ignition
cycle start.
Fume pressure switch
(S3)
Open =
Fan Off
Closed =
Fan On
This is a resistance that varies in a way inversely
proportionate to the d.h.w. outlet temperature.
D.h.w. NTC probe (B1)
NTC Sensor
10 kohm 25 °C
When the safety temperature is exceeded (100 ºC) this
interrupts power to the main coils of the gas valve (Y1).
The tripping of this device stops boiler operation
(overheating stop) and is indicated by the flashing of red
LED H2.
Overheat. safety
thermostat
(E3)
Two-contact
clicson
thermostat
When the safety temperature is exceeded (85 ºC) this
interrupts power to the main coils of the gas valve (Y1).
Its operation stops boiler operation and is indicated by the
flashing of the red LED H2.
D.h.w. limit thermostat
(E2)
Two-contact
clicson
thermostat
This is a magnetic sensor that changes its rpm in a way proportionate to the
flow of d.h.w.
It is connected to the adjustment board enabling this to detect the minimum
flow for burner ignition (2.5 l/min) and optimise the hot water temperature
adjustment.
Flow measuring device
(B2)
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