page no. 25 of 44
NVx Range Users, Installation & Servicing Instructions issue 6.4 Aug 2017.
Electrical Connections
Warning: THIS APPLIANCE MUST BE
EARTHED.
Wiring external to the air heater must be installed in
accordance with the I.E.E. Regulations for Electrical
Installations and any local regulations which apply. Wiring
should be completed in flexible conduit.
Heaters are for use with 230V, 1N, 50Hz supplies.
The method of connection to the main electricity supply
must:-
- facilitate the complete electrical isolation of the heater(s)
that will prevent remote activation of the heater during
servicing.
- 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.
All units, (with the exception of units supplied with a
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).
Warning: Lockout reset is by a switched
Neutral to the controls in the heater.
Reference must be made to Section 1.2 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.
Models supplied with a centrifugal fan/silencer duct
section require wiring to be completed between the heater
and fan. Refer to supplied wiring diagram.
NVx/D models supplied less 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.
Refer to supplied wiring diagram.
Initial Wiring Instalation
Key
A =
2 core and earth
B =
Powrtrol =
4 core and earth
Powrtrol RR=
6 core and earth
MC200 On/Off = 6 core and earth
MC200 Hi/Lo = 7 core and earth
MC200 Mod = 8 core and earth
C=
4 core and earth
D=
Screened 2 core (MC200 models only)*
* (screen must be grounded only at the MC200, See
instructions supplied with controller for wiring sizing,
Max. 100m)
2.4 Electrical Cable Installation
