20
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.
A f t e r 10 s e c o n d s h a v e e l a p s e d , t he
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
SYSTEM AVAILABLE HEAD
The head available for the heating plant is
shown as a function of the flow in graph in
fig. 20.
3.5
FLOW SWITCH
SAFETY VALVE
A flow switch safety valve 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.
3.6
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 TA-CR-SE (J2) connector of the
circuit board after having removed the jum-
per (fig. 21).
0
390
100
800
700
600
500
400
300
200
PORTATA (l/h)
PREV
ALENZA RESIDU
A (mbar)
380
370
300
350
360
Plane
t Dewy 30/50
900
400
Fig. 20
FLOW RATE (l/h)
RESIDU
AL HEAD
(mbar)
CR1
CR
TA
TA
Connettore J2
CIRCUITO CON POMPE DI ZONA
NOTA: Sostituire la pompa impianto della
caldaia con il tronchetto optional cod. 8094001.
Collegare il cavo della pompa impianto ad un
relè di potenza (RL).
L
N
TA1
CRL
R1
P
TA
R
P1
CR
CR1
RL
Cavo
pompa
impianto
CIRCUITO CON VALVOLE DI ZONA
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. 21
KEY
TA-TA1
Zone room stat
VZ-VZ1 Zone
valve
R-R1 Zone
relay
CR-CR1 Relay contact or
micro zone valve
P-P1
Zone pump
RL
Power relay
CRL
Power relay contact
J2 connector
Pump cable
1. CIRCUIT WITH ZONE VALVES
2. CIRCUIT WITH ZONE PUMPS
NOTE: Relays are used only if
the area valves have no
microswitches.
NOTE: Replace the heating pump with the
optional stub pipe, code 8094001. Connect
the pump cable to a power relay (RL).
