Sime FORMAT.zip 5 25 BF TS, Руководство пользователя

Страница: 81 / 92

79
IT
ES
PT
GB
red is higher than 85°C; the reset tempe-
rature is set at 80°C.
When sensor has tripped, the boiler will
not function for either service.
Table 3 shows the resistance values (
Ω
)
that are obtained on the sensor as the tem-
perature varies.
3.3 ELECTRONIC IGNITION
Ignition and flame detection is controlled by
an electrode located on the burner. These
guarantee maximum safety with interven-
tion times, for accidental switching off or
gas failure, of within one second.
3.3.1 Operating cycle
Rotate the rotary switch to summer or win-
ter, the red led should light up.
Burner ignition normally takes place within
10 seconds. However, it is possible for igni-
tion failures to occur, with consequent acti-
vation of signal indicating that the control
box has “locked out”.
– Gas failure
The control box runs through the cycle
normally sending electric power to the
ignition electrode. The electrode conti-
nues spark discharge for a maximum of
10 sec. If the burner does not ignite, the
control box “locks out”.
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 one of
the valve coils having a break in the win-
ding, so that the valve cannot open.
– Ignition electrode fails to spark
In the boiler, only the gas to the burner is
seen to open. After 10 sec. the control
box “locks out”.
This may be due to a break in the wire of
the electrode or to the wire not properly
fastened to the electric terminal of the
ignition transformer.
The electrode is earthed or very worm
and needs to be substituted.The control
box is defective.
When there is a sudden voltage failure, the
burner shuts out immediately; when power
supply returns, the boiler will start up again
automatically.
3.5 SMOKE
PRESSURE SWITCH (fig. 16)
The smoke pressure switch with settings
5.3 - 6.3 mm H
2
O is able to guarantee the
boiler operation even with air intake and
smoke outlet pipes at the maximum limit of
the length allowed.
The value of the signal to the pressure swit-
ch is measured by means of an instrument
connected as shown in fig. 16.
3.7 FLOW SWITCH WATER
The flow switch (8 fig. 5) is tripped, and
stops the burner when it does not detect
water in the primary circuit (< 450 l/h).
To r es t or e bur ner functioning, check
system pressure and the functioning of the
pump and the flow switch, and the cleaning
of the “Aqua Guard Filter System”.
TABLE 3
Temperature (°C) Resistance (
Ω
)
20 12.090
30 8.313
40 5.828
50 4.161
60 3.021
70 2.229
80 1.669
PRESSOSTATO
VENTILATORE
CAMERA STAGNA
(+)
(--)
Fig. 16
FAN
ROOM SEALED
SMOKE PRESSURE SWITCH