Section 5: Electrical ConnectionsPage 14
5.1 CONNECTING THE WIRING CENTRE
The wiring centre is to be powered with 230V AC/50 Hz voltage.
The electrical installation should be:
• Fused at 3A and earthed,
• Cable size to be 0.75mm
2
- 1mm
2
.
• In accordance with current regulations,
must be protected with a residual current protection
device (RCD) with a rating In=30mA.
! WARNING !
All electrical scheme components should be connected
only by qualied persons in accordance with applicable
regulations. Follow safety precautions to prevent
electrocution.
! WARNING !
After the wiring centre is turned o dangerous voltage
on terminals may still be present. Before removing cover,
disconnect the main power supply and use a Multimeter to
check for voltage on terminals and leads.
For safety reasons, the wiring centre must be connected to a
fused 230V AC power supply, with the sequence of connecting
the live (L) and neutral (N) wires. Make sure that the L and N
conductors are not crossed within the building’s electrical system,
e.g., in an electrical socket or junction box.
5.1.1 ELECTRICAL CONNECTIONS
All wiring connections should be made to the corresponding
terminals on the pluggable terminal blocks supplied in the
accessory and xing pack.
1. Remove the terminal cover from the wiring centre housing.
Refer to Figure 5-3
! NOTE !
Isolate any incoming voltages on connections before
removing the wiring centre cover beginning to connect to
the wiring centre.
I
0
Figure 5-1: Power switch
2. Connect L & N wires of the supply to Terminals 1 & 2. Refer
to Figure 5-3 for wiring centre terminal diagram.
Figure 5-2: Wiring centre terminals cover
3. Connect the earth wire to the earth terminal strip inside the
wiring centre housing.
4. Arrange the wires to prevent damaging the insulation by
cutting it with cover edges or screws securing the cover.
5. Secure wire with cable clamp to prevent loosening from
potential mechanical stress.
! WARNING !
The maximum length of the exposed wires extending
from the outer cable sheath should not exceed 50mm.
Connection cables should not be on contact with surfaces
that exceed nominal operating temperature of 50°C.
! CAUTION !
All cable clamps must be tted even if not all clamps are
needed to maintain IP20.
! NOTE !
The wiring centre cover should always be in place before
connecting the electrical supply.
5.2 COMPONENT CONNECTIONS
Electrical components of the planned system are to be connected
to the wiring centre of the Grant Aerona smart controller. Refer to
Section 5.4 for wiring centre layout.
With the adjustable circuits, mixing needs a water temperature
sensor connected to monitor the mixed water entering the circuit
to adjust accoridngly. Table 5-1 displays the relation between the
individual heating circuit and its associated component terminals.
Table 5-1: Circuit component connections
Heating Circuit Pump/Valve Mixer Water sensor
1 H1-P None None
2 H2-P H2-M H2-S
3 H3-P H3-M H3-S
Refer to 5.5, 5.6 & 5.7 for example pack wiring schematics.
For any further guidance on device connections or schematic
drawings, please contact Grant UK.
5.3 POWER SUPPLY FAILURE
In case of power supply failure, the controller returns to the work
mode in which it was working previously when the power supply
is restored.
5 Electrical Connections
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