31
23. Connection of a mains 230v supply and Volt free connection to the boiler
Ensure that the electrical installation is
carried out in accordance with the local
wiring regulations and the IEE wiring
regulations as set out in BS 7671.
5.2 Electrical Connection
The 230v AC mains supply
The cable from the main system, switch fuse
spur should be connected via a local isolation
switch to the mains terminal block within the
REHAU BA control unit marked L, N, E
(As shown in Fig. 22).
5.2.1 Boiler Connection
The REHAU BA control unit has a volt free relay,
which may be used to switch a boiler or to open
a motorised valve.
Connecting the Boiler Requiring 230v AC
Connection (Floor Heating only)
To control the switching of a boiler or motorised
valve requiring mains voltage, make a link
from the L (230v) mains input terminal to the
terminal marked BOILER – B1. Connect the
boiler switched live to the terminal marked
BOILER – B2. Connect the boiler neutral wire
to the terminal marked N in the controller and
earth wire to the terminal marked E in the
controller. (As shown in Fig. 23).
22. Main wiring connection terminals
MAINS SUPPLY FROM 3 AMP FUSED ISOLATOR
CONTROL SYSTEM SECOND FIX
ELECTRICAL CONNECTION
5.0
5.2
Connecting the Boiler requiring Volt Free (potential free) Switching (Floor Heating Only)
To control the switching of a boiler with dedicated terminals for remote switching e.g.
room sensor, connect these terminals to B1 & B2 on the control unit. Terminals B1 & B2
are volt free (As shown in Fig. 23).
Connecting the Boiler requiring ‘S’ Plan Integration
The integration of the FH system controls into an ‘S’ plan configuration requires the end
switch from the zone valve (Orange wire) to be connected to the boiler terminal B1 with
the Live (Brown) wire connected to the secondary pump terminal. The permanent live
(Grey) wire connects to the main live terminal with the neutral wire (Blue) connecting to the
main neutral terminal and earth to the E terminal within the controller (As shown in Fig. 13,
see page 17).
Boiler relay will energise 60 seconds after the start of main pump.
On the REHAU BA Master Controller, the boiler demand will stop if there is no
demand from a room sensor.
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