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Installation
Electrical connections
General Information
Electrical installation and connection
must be carried out by an authorised
installer in accordance with applicable
National Standards, Local Standards
and Regulations.
Mains connection and Customer
wiring
The appliance is designed for
permanent connection using cables
NYM 3x1.5 mm2 or H05W-F 3 x 1
mm2. The connection cable should not
be larger than 8 mm in diameter.
Connect the mains wiring to the
respective terminals, on the Boiler
Terminal strip, in the 240V section at
the rear of the control panel. (See
picture below)
A suitable mains isolator switch must
be fitted in the power supply, to the
boiler, and sited in the boiler room.
This can be used to switch off power
to the boiler for maintenance purposes
or in the event of a problem.
Mains voltage: 230 V, 50 Hz
Mains cable Connection
All external connection cables should
be stripped to a max. 30 mm. All
external Cables entering the Boiler
must be firmly clamped in the Cable
grip after connection
The length of the cables must be
designed accordingly. Additional
cables (e.g. for system integrations),
which are attached to the terminal strip
in the boiler, must be secured along
with mains lead via the Cable grip.
When connecting the boiler, ensure
the earth cable (yellow/green), which
is longer than the supply wires (see
illustration) is connected.
Multiple plug sockets, extension cable
and adapter are not appropriate. For
earthing of the appliance under no
circumstances use the piping of the
water supply installation, heating or
gas installation.
Please note the appliance is not
protected against damage from
lightning strikes.
If the mains fuses are to be changed,
use 2A Quick Blow fuses.
Note before any connections are
made below the boiler must be
switched Off.
Remote Operation (Volt Free)
A volt free enable to the Boiler for a
Thermostat, Time switch etc, is
possible via X10-02 (2)
Remote Operation (QAA73)
Connection (1) for a QAA73 must
be via a cable with at least. 2 x 0,5
mm2.
The "Bus" cable of the QAA73
(20-30 V) must be installed and
run separately from the 230 V/50
Hz cables. The QAA73 connects
to the X10-01 connector using
screened cable.
Note: If the QAA 73 remote
control is being used, the
thermostat bridge must be
disconnected from the X10-02 (2)
connection.
Note: Only one type of Boiler
enable can be used via either
X10-01 or X10-02
Ambient / External Sensor
(QAC34)
Connect the Outside Air
Temperature sensor (3), if
required, using a Screened Cable
with at least 2 x 0,5 mm
2
, with a
maximum length of 50m.
The sensor should be positioned
on a North Facing Wall at a height
of 2 2.5 m above the floor. Under
no circumstances must it be
directly exposed to sunlight.
Connect the ambient/external
sensor to the X10-06 (3)
connector (using screened cable).
Safety Thermostat for
Underfloor Heating
Remove the bridge loop from the
terminals on the right hand side of
the Terminal Block, on the 240v
connection side, and connect the
safety thermostat for the
underfloor heating.
The Connections on the boiler
wiring side will be pre-wired back
to X3-01 on the LMU unit.
Earth Block
240v Mains Power Connection
240V Connection.
1
st
TwoTerminals
Connection for
Underfloor limit
thermostat
Cable Grip
15


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