Sime Planet 25 OF Manual De Instrucciones página 124

10 sec.If the burner does not light, the
lock-out indicator 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 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 war-
ning light indicating equipment "lock-
out" lights up.
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
control box;
– No detection of flame
The continuous spark discharge of the
electrode is noted starting from ignition
even though the burner is lit.
Af ter 10 seconds have elapsed, the
sparks cease, the burner goes out, and
the warning light indicating equipment
"lock-out" lights up.
There could have a break in the wire of
the sensing electrode or the electrode
itself is touching earth: the electrode is
worn out and needs replacing. The con-
trol 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.
3.4 "20 OF - 30 OF" SMOKE
SAFETY DEVICE
This is a safety device to prevent the back-
flow of exhaust fumes into the room due to
inefficiency or a partial blockage in the flue
duct (8 fig. 3). The safety device goes into
action by blocking operation of the gas valve
when the return of the smoke into the
ambience is continuous and in quantities
KEY
TA-TA1
VZ-VZ1
120
that might constitute a danger. 10 minutes
after the tripping, the board automatically
attempts a restart and returns the boiler
back to normal operation if the fumes devi-
ce has reset. Should the boiler continue to
"lock out", it will be necessary to make a
careful check on the flue pipe, making all the
necessary modifications and amendments
so that it can work properly.
3.5 "25 BFR - 25 BF - 30 BF - 25 BFT"
SMOKE PRESSURE SWITCH
The pressure switch is factory set at the
optimal values of 4.5-6 mm H
vers.) and 10-13 mm H
This enables the boilers 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 to the pressure take-off point (8-
9 fig. 3/a).
3.6 FLOW PRESSURE SWITCH
SAFETY VALVE
A flow switch safety valve (12 fig. 3 - 3/a -
CR CR
TA
TA
Zone room stat
Zone gas valve
O ("25"
2
O ("30" vers.).
2
30
600
25
500
25
400
30
300
200
100
0
200 400 600
L
TA
1
VZ
N
R-R1 Zone relay
CR-CR1 Zone microvalve or relay contact
3/b) intervenes, blocking the operation of
the burner if the boiler is without water
due to the formation of an air lock in the
heat exchanger or if the circulator is not
working.
NOTE: If replacing the flow switch valve,
make sure that the arrow stamped on the
valve points in the same direction as the
flow of water.
3.7 SYSTEM AVAILABLE HEAD
The head available for the heating plant is
shown as a function of the flow in graph in
fig. 26.
3.8 MAINS
ELECTRICITY
CONNECTION
Use a separate electricity supply to con-
nect the room stats and relative valves.
The relays are only used where the zone
valves are not fitted with micros.
The micro or relay contact connection is
made to (J2) connector of the circuit board
after having removed the jumper (fig. 27).
con by-pass
senza by-pass
800 1000 1200 1400 1600
FLOW RATE (l/h)
PORTATA (l/h)
TA
1
R VZ R
1 1
Fig. 26
Fig. 27