Preparing the boiler for operation
Installation
46
GB
Boiler Bus terminal block
Module Bus terminal block
Boiler Room thermostat
terminal block
Module AUX1 terminal block
Module Bus terminal block
The system interface Expert
Control terminal block
T
B
BUS
TA
a
b
BUS
T
B
TA2
SE TN
BUS
T
B
SE
BUS
TA
1
T
230V
B
Electrical connection of the MCD IV
WARNING
Before carrying out any work, disconnect the power supplies using the external double-pole switch.
Scenario no. 1
:
The boiler is equipped with a
BUS
connection.
1) To access the connection block for the boiler peripherals, proceed as follows:
- remove the boiler's casing panel,
- t ilt the electrical unit forwards,
- push the two clips (
a
) to access the peripheral connections.
2) To access the connection block for the module peripherals, proceed as follows:
- remove the module's casing panel,
- undo the two screws (
b
) and remove the electrical unit's cover,
3) Make the electrical connections between the "BUS" terminal block on the boiler (B and T) and one of the two "BUS" terminal blocks on the
module (B and T).
Scenario no. 2
:
The boiler excludes the possibility of a
BUS
connection.
1) To access the connection block for the module peripherals, proceed as follows:
- remove the module's casing panel,
- undo the two screws (
b
) and remove the electrical unit's cover,
2) Make the electrical connection between the "TA" (room thermostat) terminal block on the boiler and the "AUX1" terminal block on the
module,
