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NVS Range Users, Installation & Servicing Instructions Doc Ref M102 issue 2.4 May 2018.
EXHAUST FAN
GAS VALVE
PRESSURE SWITCH
HIGH LIMIT RESET
BURNER RESET
* PACTROL BOARD
(ON/OFF UNITS ONLY)
** BRAHMA BOARD
(HI/LO & MODULATION ONLY
2.4.1 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 the 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.
The 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.
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.
2.3 General Identification of Electrical Items
2.4 Electrical Cable Installation
