3
x
Set-up and Installation
21
FA ROTEX A1 BO - 10/2007
3.8
Connect the 3-way diverter valve
The oil condensing boiler is fitted with an integrated circulation pump and a 3-way diverter valve (3W-UV) as standard. The
circulation pump is already factory-connected; the 3-way diverter valve is supplied as an accessory.
• Mount the 3-way diverter valve on the flow connection. Ensure the correct position: Connect connection B to the heating
unit and connection A to the storage tank (see fig 3-9).
• Insert the connection plug to the cable of the 3-way diverter valve to the valve drive.
3.9
Connecting control unit and electrics
Apart from the central unit, all control and safety devices of the oil condensing boiler are connected ready for operation and
inspected. Modifications on the electrical installation are dangerous and prohibited. Any resulting damages will be borne by the
user/owner alone.
There are two 3 m flexible cables connected inside the unit for the mains connection and for the external temperature sensor;
they are located in the control panel on the switchboard PCB. Only the optional applications (e.g. mixer circuit, circulation pump)
still have to be connected to the boiler control panel.
1
Boiler flow
2
Heating flow
3
Storage tank flow
4
3-way diverter valve
5.1
Valve drive
5.2
Unlocking button of the drive lock
5.3
Hand lever
Fig. 3-9
3-way diverter valve
The circulation pump and the 3-way diverter valve each have one cable with a connection plug. These cables
are ready for use.
If the storage tank charging circuit is to be operated through a charging pump (parallel operation, cascade
circuit etc.), a storage tank charge pump will have to be installed in the heating system instead of the 3-way
diverter valve. An adapter cable is needed for controlling the storage tank charge pump (
E 1500430
).
WARNING!
Live parts can cause an electric shock on contact and cause life-threatening burns and injuries.
• Before beginning work on live parts, disconnect them from the power supply (switch off fuse, main
switch) and secure against unintentional restart.
• The electrical connection should only be performed by electrical engineers in compliance with valid
standards and guidelines as well as the specifications of the energy supply company.
