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SECTION 10: WIRING AND ELECTRICAL INFORMATION
19 of 42
SECTION 10: WIRING AND ELECTRICAL INFORMATION
10.1 Electrical Supply
All heaters need a constant 230 V 50 Hz single
phase supply connected to terminals L, N & Earth.
Polarity "L & N" must be correct. The voltage
between neutral and earth should be 0 and never
exceed 15 volts.
All heaters and controls must be correctly earthed.
All external wiring must comply with the relevant
local codes. Wire specification H05VV-F.
External controls must have the same constant
230 V 50 Hz supply.
An isolator with a contact separation of at least
3 mm on all poles must be installed adjacent to, but
not attached to, the heater to disconnect all supplies
to the heater and any remote control. This switch
should be fused to 5 A.
The final connection to the heater should be made
by flexible cable or conduit to the 7 pole plug on the
inside of the heater using 1 mm
2
cable on all
models.
10.2 Remote Controls
The heater is designed to be operated by controls
installed remote from the heater. See Page 20,
Section 10.3.
10.2.1 Burner Controls (Thermostat)
Controls to operate the burner must be connected
between L
1
and T
2
.
10.2.2 Positioning Room Thermostats or
ROBERTS GORDON
®
Control
A room thermostat or ROBERTS GORDON
®
control should be mounted on a wall or column at a
height of approximately 1.5 metres from the floor to
measure the ambient temperature. It should be clear
of both cold draughts and the direct path of warm air
from the heater.
10.2.3 Remote Frost Thermostat
When required, connect to L
1
and T
2
parallel to the
room thermostat.
Locate within the heated space adjacent to the most
vulnerable equipment that requires protection.
See Page 20, Section 10.3.
10.2.4 Remote Fan Controls
The fan will operate automatically providing there is
a constant 230 V supply to the main terminals.
A switch or control wired between terminals Y & T
1
in the terminal block will allow external control of the
fan(s).
The fan may be controlled to operate continuously
from an external control, with the burner cycling on
and off, providing that the fan run-on at close down
is not impaired.
DANGER
Electrical Shock Hazard
Disconnect electric before service.
Heater must be properly grounded.
Failure to follow these instructions can result
in death or electrical shock.