Table of Contents
Advertisement
Normally, the result of the comparison between these two signals
directly operates the fan speed adjusting the useful output gen-
erated 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 90°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 9.10 and 9.11page 23.
9.4 operation lights
The Electronic control/ignition p.c.b. is provided with three lamps
(L.E.D. indicators) 20 in Figure 9.2 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 lamps in-
dication and their 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 9.2) 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 primary circuit
(no water or absence of flow)
Lack of burner ignition
Safety thermostat lock out
Faulty fan control system
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 (20 in Fig-
Flue temperature probe NTC lock out
Open flue temperature probe NTC
Faulty external temperature probe NTC
Flame detection error
Lack of power supply or faulty electronic
control p.c.b.
Faulty Electronic control/ignition 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.
9.5 Setting the boiler control function modes
It is possible to select the various boiler control function modes
by using the function selector knob 7 and the D.h.w. temperature
control knob 8 (Figure 9.5).
During the function modes setting, the boiler does not operate.
11
8
7
9
figure 9.5
9.6 Adjustment of maximum useful output in c.h.
mode
The following procedure allows the output of the boiler for c.h. to
be limited to meet the system requirement. Adjusting the maxi-
mum useful output in c.h. mode does not prevent the boiler firing
at maximum rate for d.h.w. production.
1 Turn the boiler ON positioning the function selector knob 7 as
indicated in Figure 9.6.
11
figure 9.6
2 Keep pressed the reset button 9 for about 10 seconds until
the lock-out signal lamp 10 blinks.
3 The lamps 11 should give the indication as in Figure 9.7
(maximum c.h. useful output adjustment). If not, press the
reset button repeatedly to obtain it.
10
8
7
9 10
- 19 -
Advertisement
Table of Contents
