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INSTALLERUSER
MAINTENANCE TECHNICIAN
e jumper X40 must be eliminated whenever
the room thermostat or cascade regulator are
connected. the cascade regulator; in addition, it
must be eliminated also in case of “bus” connec-
3.2 WIRING DIAGRAM.
Key:
A2 - P.C.B.
A4 - Display board
B1 - Flow probe
B2 - Domestic hot water probe (optional)
B4 - External temperature probe (optional)
B5 - Return probe
B10 - Flue probe
B25 - System ow meter
E1 - Ignition electrode
E2 - Detection electrode
tion or when the 0 ÷ 10 V inlet is used.
A thermostat can be used instead of “B2” (set
P29 = 17)
E4 - Safety thermostat
E5 - Heat-exchanger safety thermostat (manual
reset)
E13 - Safety thermofuse
G2 - Igniter
M1 - Boiler circulator pump
M20 - Fan
M30 - ree-way valve (optional)
S1 - Main switch
S20 - ON/OFF room thermostat (optional)
X40 - Room thermostat jumper
Y1 - Gas valve
1 - Low voltage
2 - 0 - 10 V analogue input
3 - External reset
4 - Free contact alarm MAX. 1 A 230 Vac
5 - External pump
6 - External relay (optional)
7 - Coil 230 Vac MAX. 0.1 A
Colour key:
BK - Black
BL - Blue
BR - Brown
G - Green
GY - Grey
G/Y - Green-Yellow
OR - Orange
P - Purple
PK - Pink
R - Red
W - White
Y - Yellow
W/BK - White / Black
For safety reasons the P.C.B. envisions a fuse
that cannot be restored in series with the electric
power supply of the gas valve.
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