Vaillant auroTHERM VFK 900, Start-Up, Maintenance And Troubleshooting Manual

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19 Manual - Solar hot water systems 0020009607_02
Control Center VR 65
The Control Center VR 65 provides a system solution
which allows Vaillant low-voltage eBUS controllers to be
used in the English market with valves and hot water
cylinders with traditional 230 V cylinder thermostats.
The information on the heat requirements of the solar
cylinder is forwarded to the Vaillant ecoTEC boiler by
the Control Center VR 65. The boiler decides whether
hot water requirements has to be met and sends the
signal to control the 230 V valves via the VR 65.
In this way, the boiler can store different target
temperatures for heating and hot water operation.
Standard 230 V components can be integrated in the
Vaillant eBUS system via the Control Center VR 65. For
wiring, refer to Section 5.8, Electrical installation, and
the installation manual of the Control Center VR 65
(item no. 0020007476).
VRT 360 programmable room thermostat
The VRT 360 is a programmable room thermostat with a
week programme for heating, hot water and circulation
pump, which can be connected to Vaillant boilers with
With the VRT 360, you can preset the room temperature
with a heating programme.
The VRT 360 has additional functions including central
heating override and the time control function of an
additional circulation pump.
For wiring, refer to Section 5.8, Electrical installation,
and the operating and installation manual of the
VRT 360 (item no. 838568).
h Note!
If the VRT 360 is used for central heating
control, the Control Center VR 65 is
additionally required to measure the solar
cylinder temperature and switch from cylinder
reheating to heating mode and vice versa as
required.
VRC 400 weather compensator
The VRC 400 weather compensator is an external
temperature compensator and can be used in
conjunction with a Vaillant eBus boiler to provide time
and temperature control of the central heating.
5 Installation
• Use the following tables to check the scope of delivery
before beginning with the installation.
Installation sequence
Install the solar system in the following order:
- Solar collectors and solar pump unit
- Solar cylinder
- Solar circuit piping
- Reheating circuit piping
- Hot water piping and secondary return (if available)
- Cold water supply
- Discharge pipe
- Electrical installation
• Assemble the collectors according to the assembly
manual (enclosed with collector installation set).
• Install the solar pump unit according to the installation
manual (enclosed with solar pump unit).
• Proceed with the installation as described in the
following sections.
Description of the components 4
Installation 5
N.B. secondary return not recommended.