page no. 40 of 68
LX Range Users, Installation & Servicing Instructions Doc Ref M110 issue 1.0 Dec 2020.
2.4.1. Electrical Connections
Warning: THIS APPLIANCE MUST BE
EARTHED.
Warning: Wiring external to the unit must be
carried out by an appropriately qualified
person to current IEE regulations for
Electrical Installations and any local
regulations which apply.
Warning: Any lockout reset is via a switched
Neutral to the controller within the heater.
The local electrical supply must be run to a point adjacent
to the heater and be suitably terminated to provide an
isolation point that will prevent remote activation of
the unit during servicing. Wiring should be completed in
flexible conduit.
The local electrical supply conditions must be compatible
with the electrical data given on the appliance data plate.
Heaters are supplied by either 230V - 1ph, 50Hz or 415V -
3ph, 50Hz dependent upon the heater size and type. (See
section 1.2 technical data or data plate on heater for exact
voltage). The method of connection to the main electricity
supply must:-
• facilitate the complete electrical isolation of the
heater(s) via a suitable fused isolator that will prevent
remote activation of the heater during servicing (see
section 2.4.5 for ratings).
• be in a readily accessible position adjacent to the
heater(s).
• serve only the heater(s).
• have a contact separation of at least 3mm in all poles.
See section 2.5 or the accompanying wiring diagram for
the heater electrical connections.
The electrical control panel is located at the front of the
heater and cable entry points are provided in the adjacent
heater framework. Heaters not supplied with inbuilt time
and temperature controls will also require completion of a
suitable B.M.S interface
All units, (with the exception of units supplied with a
separate centrifugal fan/silencer duct section) are fully
prewired and only require final connections for the
incoming mains supply and completion of the control
circuit (230V).
Reference must be made to Section 2.4.5 to ascertain
the electrical loading of the unit(s) being installed so that
cables of adequate cross-sectional area are used for
the electrical installation. The length of the conductors
between the cord anchorage and the terminals must be
such that the current carrying conductors become taut
before the earth conductor if the cable or cord slips out
of the cord anchorage. All external controls must be of an
approved type.
Heaters supplied with a centrifugal fan/silencer duct
section (i.e. less main fan) must be electrically interlocked
to the air movement system so that this is started in the
same manner as the air heater fan would be. A connection
from the appropriate heater terminal (see wiring diagram
with the heater) must be made to one side of the fan
motor contactor coil, the other side of the coil being
connected to Neutral. Under no circumstances must
the fan motor electrical supply be taken direct from the
internal wiring of the heater.
Note: To achieve maximum system efficiency
it is recommended that units are controlled by
a Powrmatic MC200 or MC300 unit. Simple
room thermostat and thermostat/time clock
control systems will not provide optimum system
efficiency and fuel savings.
Wiring drawings and instructions are supplied with the
respective controller.
2.4.2.1. Typical Wiring Installation
LX F showing remote MC200 controller
Fused
Isolator
Controller
(MC200 shown)
Remote Sensor
(optional)
230V
Supply
2.4 Electrical Cable Installation
Key:
Heater Mains Supply = 2 core and earth
MC200 Controller = 5 core and earth
= 2 core ELV (0-10Vdc)
alt. MC300 Controller = 7 core screened + LNE
Optional MC200 sensor = Screened 2 core*
* (screen must be grounded only at the MC200, See
instructions supplied with controller for wiring sizing,
Max. 100m)
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