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Normally, the result of the comparison between these two sig-
nals directly operates the adjustment elements of the gas valve
modulation device, adjusting the useful output generated in order
to stabilize the temperature of the exiting water.
If during the d.h.w. mode operation, the temperature of the pri-
mary circuit goes over 75°C, the useful output is automatically
reduced so that the primary circuit cannot reach excessive tem-
peratures.
The control sequences in
illustrated in detail in sections 10.2 and 10.3.
10 .4 Operation lights
The Electronic control/ignition p.c.b. is provided with three lamps
(L.E.D. indicators) 12 in Figure 10.2 that give optical information
during the operation of the boiler.
The green lamp on the left gives information whether the boiler
is in stand-by mode or during the normal operation of the boiler.
The following table gives the relationship between the lamp indi-
cation and its meaning.
A short pulse every 4 seconds
A short pulse every 4 seconds
1 second ON 1second OFF
1 second ON 1second OFF
With the boiler switched ON (
ure 10.2) are activated.
The following table gives the relationship between each of the
possible lamp combinations and their meaning.
Normally operating boiler
(see the previous table for details)
C.h. operation
D.h.w. operation
Frost protect operation
D.h.w. operation
Excessive temperature on primary circuit
Faulty c.h. temperature probe NTC
Faulty d.h.w temperature probe NTC
Faulty flue temperature probe NTC
Faulty primary circuit
(no water or low c.h. pressure)
Faulty primary circuit
(absence of flow)
ELECTRONIC CONTROL/IGNITION P.C.B.
function and in
function are
Boiler in stand-by condition.
(function control in
position).
Anti- freeze system active.
Boiler ON condition
(function control in
or
position)
or
) all the lamps (12 in Fig-
Faulty air pressure sensor
Lack of burner ignition (no ignition signal from
the full sequence ignition device)
Safety thermostat lock out
Flue temperature probe NTC lock out
Flame detection error
Flame detection error
Lack of power supply or fauly electronic
control p.c.b. *
Lamp OFF
Lamp ON
Flashing lamp,alone or simultaneously
with another lamp
Flashing lamp, alternate with another lamp
* These conditions are normal only for a short time when the
power supply is applied to the boiler.
If permanent they indicate a faulty p.c.b.
10 .5 Setting the boiler control function modes
It is possible to select the various boiler control function modes
by using the function selector knob A and the d.h.w. temperature
control knob B (Figure 10.5).
During the function modes setting, the boiler does not operate.
F
B
A
Figure 10 .5
10 .6 Useful output setting
To set the useful output proceed as follows:
1 Remove the front panel of the case.
2 Take off the lid of the sealed chamber.
3 Switch on the appliance at the mains isolating spur.
4 Turn the boiler OFF positioning the function selector A as in-
dicated in Figure 10.6.
F
B
Figure 10 .6
5 Disconnect the electrical connectors C of the c.h. tempera-
ture probe NTC in Figure 10.7.
D
E
A
D
E
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