INSTALLATION INSTRUCTIONS
TR05A153.B1107
24
4.7.2 Power supply
The connection to the mains power supply must be carried out by professionally qualified personnel,
registered in accordance with current legislation.
Connect the power supply to the terminal board inside the control panel as follows:
a.
Ensure the supply is isolated;
b.
Remove the front casing panel of the boiler (refer to Section 6.3 for guidance);
c.
Remove terminal block cover
A
(see Figure 15);
d.
Connect the wires to terminal block
B
as follows (see Figure 15);
•
Connect the earth wire (coloured green/yellow) to the terminal marked with the earth symbol “
“;
•
Connect the neutral wire (coloured blue) to the terminal marked with the letter “
N
”;
•
Connect the
permanent live
wire (coloured brown) to the terminal marked with the letter “
L
”;
e.
Replace terminal block cover
A
.
The appliance MUST be supplied with a
permanent live
in order for the boiler’s protective functions to
operate correctly. These functions include frost protection, post-ventilation, pump overrun and pump
& 3-way valve inactivity protection. On first connection to the power supply, the appliance must be
switched on using the ON/OFF button on the control panel to activate all of the above protective
features. The appliance can then be switched off but the protective features will remain active.
The terminals marked
Ta
and
Se
are for external
zero-voltage
controls including room thermostats, time clocks,
zoned system controls and weather compensating controls. Connection of these controls is covered in Section 0.
Figure 15: Power supply connections
T
a
brown
green/yellow
blue
L
N
T
a
S
e
S
e
B
A
ON / OFF
OFF
TIME
ON
