Sime PLANET 25 BFT TS, Manual

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125
IT
ES
PT
GB
RO
RUS
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 C - 30 OF C” 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
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 modi-
fications and amendments so that it can
work properly.
3.5 “25 BFT TS” SMOKE
PRESSURE SWITCH
The pressure switch is factory set at the
optimal values of 4.6 - 5.6 mm H
2
O.
This enables the boilers operation even with
air intake and smoke outlet pipes at the maxi-
mum limit of the length allowed. The value of
the signal to the pressure switch is measu-
red 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)
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, or because the primary water fil-
ter “Aqua Guard Filter System” (32 fig. 2) is
obstructed with impurities.
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 zone val-
ves.
The micro or relay contact connection is
made to (J2) connector of the circuit board
after having removed the jumper (fig. 27).
CR1 CR
TA
TA
Connettore J2
L
N
TA TA
1
VZ
R VZ
1
R
1
NOTA: I relé vengono impiegati solo
nel caso le valvole di zona siano
prive di micro.
Fig. 27
KEY
TA-TA1
Zone room stat
VZ-VZ1 Zone gas valve
R-R1 Zone relay
CR-CR1 Zone microvalve or relay contact
0
600
200 1600 1400 1200 1000 800 600 400
PORTATA (l/h)
PREV
ALENZA RESIDU
A (mbar)
500
400
100
200
300
con by-pass
senza by-pass
25
30
25
30
For
m
at - Plane
t - Open
25 BFT
25 BFT
Fig. 26
FLOW RATE (l/h)
RESIDU
AL
HEAD
(mbar)
NOTE: Relays are used only if the area
valves have no microswitches.
Connector “J2”