Manual Vaillant VRC 470F (page 7 of 56) (English)

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System description

Installation instructions VRC 470f 0020124645_00 7

3 System description

3.1 System design

The VRC 470f controller controls the Vaillant heating

and hot water systems.

You can fix the controller to a wall using the wall-mount-

ing base.

You can mount the radio receiver unit on a wall using

the wall-mounting base or in the controller slot of a Vail-

lant boiler, without the wall-mounting base.

12 3

Fig.3.1 System drawing

1 VRC 470f controller

2 VR 21 outside temperature sensor/transmitter (DCF77)

3 Boiler

4 Radio receiver unit

3.2 Functionality

Heating installation

The VRC 470f is a weather compensator with a separate

sensor. The VR 21 sensor is fitted outdoors and meas-

ures the outside temperature and transmits it by radio

signal to the controller. The controller controls the flow

temperature of the heating as a function of the outside

temperature. If the outside temperature is low, the con-

troller increases the flow temperature, and if the outside

temperature is high, it reduces the flow temperature

again. Thus, the controller absorbs fluctuations in the

outside temperature and the room temperature remains

at the constant, preset temperature value.

Hot water production is not affected by the weather

compensation.

The controller is supplied with power by batteries.

Data transmission between the controller and the radio

receiver unit takes place via radio communication. Data

transmission between the radio receiver unit and the

boiler takes place via an eBUS interface, which also pro-

vides the power supply for the radio receiver unit.

For remote diagnosis and programming, you can equip

the controller with the Vaillant Internet communication

system vrnetDIALOG.

Hot water production

With the VRT 470f controller you can also specify the

temperature and timings for hot water production. The

boiler heats the water in the domestic hot water cylinder

to the preset temperature. The times at which hot water

should be available in the cylinder, can be defined with

the help of time periods.

If a circulation pump is installed in the heating system,

time periods can also be set for circulation of the hot

water.

How can one test if a VR20 outside temp. sensor is working? If pressing the Red button on the rear of the module does not activate the flashing green light. is this an indication of faulty unit? The lens is clean. Solar sensor charging at around 2.1 volts. Battery is at 3volts. Submitted on 29-12-2021 at 16:45
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Vaillant VRC 470F Manual

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