5 Electrical installation
10
Installation instructions VRT 350 0020131957_01
5.1
Connect the controller to the boiler with a
"3-4-5 Terminal"
1.
Disconnect the power supply to the boiler.
2.
Disconnect the boiler from the power mains by pulling
out the mains plug or de-energising the boiler using a
partition with a contact opening of at least 3 mm.
3.
Secure the power supply to the boiler against being
switched on again.
4.
Check that there is no voltage in the boiler.
1
2
1 Controller terminal block
2 Boiler terminal block
5.
Check whether the bridge is installed between termin-
als 3 and 4 on the PCB of the electronics box and, if re-
quired, install the bridge between terminals 3 and 4.
6.
Connect the eBUS line to the terminal block
(1)
in the
wall-mounting base of the controller.
