Installation Instructions

Electrical installation
14 Installation instructions VRC 470f 0020124645_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 mains
power 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.
If you fit the radio receiver unit in the boiler, the electri-
cal connections are made by contact between the con-
troller's pin header connector and the mating connec-
tion on the boiler. Wiring up the radio receiver unit is
only required if you have mounted it on a wall.
Connecting up a wall-mounted radio receiver unit
b
Caution!
Malfunctions caused by incorrect installa-
tion!
Without a bridge between terminals 3 and 4
on the PCB in the control cabinet, the boiler
cannot work.
> When connecting the radio receiver unit,
ensure that the jumper is fitted between
terminals 3 and 4.
> Disconnect the power supply to the boiler.
> Secure the power supply to the boiler against being
switched on again.
1
2
Fig.5.1 Wiring up the radio receiver unit
1 Pin header connector in wall-mounting base of radio receiver
unit
2 Boiler terminal strip
i
When connecting the eBUS line, there is no
need pay attention to the polarity. If the two
connections are switched around, communica-
tion is not affected.
Connect the radio receiver unit to the boiler as follows:
> Connect the eBUS line to the terminals (1) of the pin
header connector in the wall-mounting base of the
radio receiver unit.
> Connect the eBUS line to the terminal strip of the
boiler (2).