Electrical installation
14
Installation instructions VRC 470 0020116690_00
5
5
Electrical installation
e
Danger!
Risk of death from live connections!
When working in the control cabinet of the
boiler there is a risk of death from electric
shock. Continuous voltage is present on the
mains connection terminals, even if the main
switch is turned off!
>
Switch the main switch off before working
on the control cabinet of the boiler.
>
Disconnect the boiler from the power
mains by disconnecting the mains plug or
by de-energising the boiler via an isolating
device with a contact opening of at least
3 mm (e. g. fuses or power switches).
>
Secure the power supply against being
switched on again.
>
Open the control cabinet only when the
appliance is disconnected from the power
source.
5.1
Connecting external sensor VRC 693
>
Disconnect the power supply to the boiler.
>
Secure the power supply to the boiler against being
switched on again.
1
2
Fig. 5.1 Connecting external sensor VRC 693
1 Connection cable to the external sensor VRC 693
2 6-way edge connector for plug location X41 (boiler)
Connect external sensor VRC 693 to the boiler as
follows:
>
Connect the connection cable to the terminals of the
external sensor (
1
).
>
Connect the connection cable to the 6-way edge con-
nector (
2
).
>
Guide the connection cable with the edge connector
into the control cabinet of the boiler.
>
Connect the 6-way edge connector (
2
) to slot X41 of
the PCB of the control cabinet.
5.2
Connecting external sensor VRC 9535
>
Disconnect the power supply to the boiler.
>
Secure the power supply to the boiler against being
switched on again.
1
2
Fig. 5.2 Connecting external sensor VRC 9535
1 Terminal rail VRC 9535 external connector
2 6-way edge connector for plug location X41 (boiler)
Connect external sensor VRC 9535 to the boiler as
follows:
>
Connect the connection cable to the terminal strip of
the external sensor (
1
).
>
Connect the connection cable to the 6-way edge con-
nector (
2
).
>
Guide the connection cable with the edge connector
into the control cabinet of the boiler.
>
Connect the 6-way edge connector (
2
) to slot X41 of
the PCB of the control cabinet.
