2.3 Basic Unit
Fan / Limit stat
Exhaust Flue
Burner
Data Plate
MC200 Controller
High Limit Reset
Electrical Connections
(behind cover)
2.4 Electrical Cable Installation
Electrical Connections
Wiring external to the air heater must be installed in accor-
dance 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 or 400V, 3N, 50Hz
supplies (see heater data plate).
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 are fully prewired and only require final connections
for the incoming mains supply. Heaters not supplied with
inbuilt time and temperature controls will also require
completion of the external control circuit (230V) via a room
thermostat, time clock etc. and, if applicable, the remote low
level lockout reset.
All heaters must be earthed.
Reference must be made to Table 3 Page 21 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 exter-
nal controls must be of an approved type.
Heaters supplied 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 viz. 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 connect-
ed to Neutral. Under no circumstances must the fan motor
electrical supply be taken direct from the internal wiring of
the heater.
A =
2 core and earth (Single Phase)
4 core and earth (Three Phase)
B = Powrtrol = 4 core and earth
Powrtrol RR = 4 core and earth
MC200 =
4 core and earth
C =
2 core screened (MC200 model only)*
*(screen must be grounded only
at the MC200)
Page 16 CPx Gas or Oil Cabinet Heater Range Issue 2.1 June 2014
