30
3-3
3
2
1
1
INSTALLERUSER
MAINTENANCE TECHNICIAN
For "WE-BUS", "0-10", "Simple BUS cascade"
connection, remove the X40 bridge.
A thermostat can be used instead of B2 (set the
P29 = 17 parameter).
e "Remote control for single high power boiler"
must be connected to the "M" and "O" terminals
(set the address to zero).
Congure the corresponding parameters when
connecting in “simple cascade”, or when con-
necting in “system side ow probe”, or “D.H.W.
p u m p”.
3.3 VERY LOW VOLTAGE WIRING DIAGRAM.
Key:
A2 - Electronic board
A4 - Display board
B1 - Flow probe
B1-2 - System side ow probe (optional)
B2 - Domestic hot water probe (optional)
B4 - External temperature probe (optional)
B5 - Return probe
B10 - Flue probe
E4 - Safety thermostat
E5 - -Heat-exchanger safety thermostat
(manual reset)
E13 - Flue safety thermofuse
M1 - Boiler circulator pump
M20 - Fan
S5 - System pressure switch
S6 - Air pressure switch
S20 - ON/OFF room thermostat (optional)
X40 - Room thermostat jumper
1 - Testing
2 - “Simple cascade” communication bus
3 - 0 - 10 V analogue input
Colour key:
BK - Black
BL - Blue
BR - Brown
G - Green
GY - Grey
OR - Orange
P - Purple
PK - Pink
R - Red
Y - Yellow
Y/G - Yellow / Green
W - White
W/BK - White / Black