22
20
1
3
2
4
5
6
7
8
9
BR
BR
BK
BK
BK
R
R
R R
BK
BK
GY
BL
BL
BR
BR
BR
R
R
OR
OR
BL
BL
BK
BK
BL
Y/G
INS
TALLER
US
ER
MAINTEN
AN
CE
TECHNI
CI
AN
TECHNI
CAL
D
AT
A
3.4 DIM A-2BT ERP WIRING DIAGRAM.
Key:
B3-2 - Zone 2 low-temperature flow probe
B3-3 - Zone 3 low-temperature flow probe
B4 - External probe (optional)
E7-2 - Zone 2 low-temperature safety thermo-
stat
E7-3 - Zone 3 low-temperature safety thermo-
stat
M10-1 - Zone 1 pump
M10-2 - Zone 2 pump
M10-2 - Zone 3 circulator
M31-2 - Mixing valve zone 2
M31-3 - Zone 3 mixing valve
R12 - Zone 2 low-temperature flow regulation
trimmer
R13 - Zone 3 low-temperature flow regulation
trimmer
S25 - Board setting selector
S26 - Board setting selector
S27 - Board setting selector
S28 - P.C.B. setting selector
T2 - Zone control unit low-voltage feeder
Z1 - Anti-jamming filter
1 - 230 Vac 50 Hz power supply
2 - Central heating request outlet to boiler
or other DIM ERP
3 - Central heating request inlet from other
DIM ERP
4 - Zones signal state outlet for other DIM
ERP
5 - Connection to DIM ERP safety thermostat
6 - Connections to ON/OFF room thermostats
7 - Zones signal state inlet from boiler or
other DIM ERP
8 - DIM BUS connection to boiler
9 - Zones control unit
BK - Black
BR - Brown
BL - Blue
GY - Grey
R - Red
OR - Orange
Y/G - Yellow/Green
Zone
Type
Zone 1
Direct
Zone 2
Mixed
Zone 3
Mixed