6 720 607 800 (2016/02)
6 | Appliance specifications
2.7
Electrical layout
Fig. 2
Electrical layout
[5]
Heat sensor
[6]
Water flow sensor
[92]
Gas valve
[117]
Ignition electrode
[118]
Ionization electrode
[119]
Temperature limiter
[226]
Fan
[228]
Differential pressostat
2.8
Operational instructions
Hot water
Open the gas and water valves and ensure that all joints are
hermetic.
Place the main switch (
Fig. 3, [3]) in the operating position
(
chapter 3.2), so that the appliance is quickly ready for use.
When a hot tap is opened, the water flow sensor should be in
(Fig. 2, [6]) send a signal to the control unit. This signal
initiates the following:
•
The fan starts working
•
Simultaneously, sparks are produced and the gas valve
(Fig. 2, [92]) opens.
•
The burner lights
•
The ionization electrode (Fig. 2, [118]) controls the state
of the flame
•
The water temperature is controlled automatically by the
sensors/controllers according to the temperature selected
Security cut-off when safety period is surpassed
If a flame is not achieved within the stipulated security period
(15 sec), a security cut-off will occur.
The presence of air in the gas inlet pipe (when the appliance is
used after long periods of inactivity for example) may delay
ignition.
In this case, if the attempts to ignite go on too long, the security
mechanisms prevent operation.
Security cut-off due to excessive water heating
The control unit detects the heating temperature via a NTC
resistor located in the hot water exit tube and the temperature
limiter located in the heat exchanger. If it detects an excessive
temperature it provokes a security cut-off.
Security cut-off due to deficient exhaust conditions
(pressostat)
The pressostat detects pressure differences outside the fan
and effects a security cut-off when it detects deficient exhaust
conditions.
Restarting after security cut-off
To restart the appliance following a security cut-off:
▶ Press the reset button.
