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6.3.9
Connecting a heating element
Fig.30
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
1 2 3 4 5 6 7 8 9 10
101112131415
1
6.3.10
Connecting the hydraulic backup
Fig.31
OT
Fig.32
2
X1
X2
CB-21
1
3
7856310 - v02 - 21122023
1. Connect stage 1 of the heating element 11-12-13 to the 230 V
2. Connect stage 2 of the heating element 14-15 to the 230 V terminal
16 17 18 19 20 21 22 23 24 25 26 27 28 29
2
1. Take off the front lower cover.
2. Connect the boiler to 21-22 on the signal cable terminal block.
16 17 18 19 20 21 22 23 24 25 26 27 28 29
16 17 18 19 20 21 22 23 24
OT
boiler
2
1. Disconnect the L-BUS bus terminator from terminal block X2 on the
2. Connect the L-BUS bus terminator to the backup boiler PCB.
3. Connect the backup boiler to terminal block X2 of the CB-21 PCB.
terminal block.
block.
See also
Electrical diagram, page 9
Configuring the backup, page 29
See also
Electrical diagram, page 9
Configuring the backup, page 29
Connecting an Opentherm backup boiler
Connecting an L-BUS backup boiler
CB-21 PCB.
See
See the boiler manual.
6 Installation
21
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