Sime Format System 25 HE, Инструкции по установке и обслуживанию

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the trimmer counterclockwise. The slow
ignition pressure level can be set during
the first 7 seconds following burner igni-
tion discharge
After setting the pressure level upon
ignition (STEP) according to the type of
gas, check that the gas pressure for
heating is still at the value previously
set.
– “JP1” connector (pos.10)
In the heating phase, the electronic
board is programmed to include a bur-
ner technical delay interval of approx.
180 seconds, which occurs at every igni-
tion after a forced stop.
By “forced stop”, we indicate a stop due
to a sensor (SM) temperature difference
of more than 5°C to temperature set at
heating potentiometer.
The aim is to overcome the problem of
repeated ignitions and turning off with
very short time intervals between. This
could occur in particular in systems pre-
senting high load losses.
At each restart after the period of slow
ignition, the boiler sets itself for about 1
minute at the minimum modulation pres-
sure, and then moves to the heating
pressure value set.
When the jumper is inserted, both the
programmed technical pause and the
period of operation at minimum pressu-
re in the startup phase are cancelled. In
this case, the times elapsing between
turning off and subsequent re-ignition will
depend on a temperature difference of
5°C detected by the SM sensor (heating
flow sensor).
– “JP2” connector (pos. 9)
Jumper must be inserted.
– “MAX” fan maximum speed
trimmer (pos.2)
To set fan at a maximum speed.
– “MIN” fan minimum speed
trimmer (pos.4)
To set fan at a minimum speed.
ATTENTION: It is essential that all opera-
tions described above are carried out by
authorized technical staff. If not, the war-
ranty is invalid.
3.2 TEMPERATURE SENSOR
Antifreeze system managed by active hea-
ting NTC sensor when water temperature
is 6°C.
The heating sensor works also as a limit
thermostat which switches off the burner
when temperature is over 80°C. Reset
temperature is set at 75°C.
When sensor (SM) is interrupted, neither
of the boiler's heating services will func-
tion.
Table 5
shows the resistance values (
Ω
)
obtained on the heating sensor as the tem-
perature varies.
3.3 ELECTRONIC IGNITION
Ignition and flame detection is controlled by
a sole electrode located on the burner. It
guarantees maximum safety with interven-
tion times, for accidental switching off or
gas failure, within one second.
3.3.1 Operating cycle
Rotate the selector knob to summer or win-
ter, and verify that green LED (
) lights up
to confirm the presence of voltage.
The burner must be ignited within 10
seconds max.
However, it is possible for ignition failures to
occur, with consequent activation of “locked
out” signal:
– Gas failure
The electrode continues spark discharge
for a maximum of 10 sec. If the burner
does not light, the board - after a 5
second ventilation stop - reactivates
discharge for further 10 seconds. This
cycle will be repeated 5 times, after that,
the lock-out red LED will light up.
This may occur upon first ignition or after
long periods of boiler lay-off when there is
air in the pipes.
It may be caused by the gas cock being
closed or by the gas valve failing to open.
– Ignition electrode fails to spark
The electrode continues spark discharge
for a maximum of 10 sec. If the burner
does not light, the board - af ter a 5
second ventilation stop - reactivates
discharge for further 10 seconds. This
cycle will be repeated 5 times, after that,
the lock-out red LED will light up.
This may be due to a break in the wire of
the electrode or to the wire not properly
fastened to the ignition transformer ter-
minal. The electrode itself may touch
earth or may be heavily worn out and
needs replacing. The electronic board is
defective.
When there is a sudden voltage failure, the
burner shuts down immediately; when the
power supply returns, the boiler will start
up again automatically.
3.4 FLOW SWITCH SAFETY VALVE
A flow switch safety valve (8 fig. 2) interve-
nes, blocking the operation of the burner if
the boiler is without water due to the for-
mation of air bubbles in the heat exchanger
or if the circulator is not working correctly
or because the “Aqua Guard” heating cir-
cuit filter is clogged.
NOTE: If replacing the flow switch valve is
necessary, make sure that the arrow
stamped on the valve points in the same
direction as the flow of water.
3.5 SYSTEM AVAILABLE HEAD
The head available for the heating plant is
shown as a function of the flow in graph in
fig. 16.
To obtain the maximum head available to
the system, turn off the by-pass by turning
11
TABLE 5
Temperature (°C) Resistence (
Ω
)
20 12.090
30 8.313
40 5.828
50 4.161
60 3.021
70 2.229
80 1.669
0
200 1200 1000 800 600 400
PORTATA (l/h)
PREV
ALENZA RESIDU
A (mbar)
500
400
100
200
300
For
m
at Dewy
.zip
25 BF
30 BF
BFR
Fig. 16
Flow rate (l/sec)
A
vailable
head
(mbar)
FORMAT SYSTEM
25 HR
NO
NO