1611UDSBD-3GBEN, Pag. 18/36
11. Electrical
supply
and
connections
The electrical installation may only be carried out by an appropriately qualifi ed
person current to IEE Regulations. The supply line to the heater should include
a main switch. The minimum
clearance
distance between the contacts must be
more than 3 mm.
All electrical connections should be made in the heater control compartment
(refer to fi gure 8). Screw type terminals are provided. Connections should be in
accordance with the terminal markings and the wiring diagram affi xed to the air
heater.
Attention :
Serious damage can occur to burner relay when faulty connection of thermostat,
reset switch or burner failure lamp. Switching of wires for reset switch and
fl ame failure (e.g in a remote control box) will destroy the burner relay.
The minimum external control required for the air heater is a room thermostat.
It is essential that the main input line and neutral to terminals L and N
remain live at all times even when the heater is switched off to ensure
correct operation of the unit.
A polarisation switch with green indicator light is fi tted inside the heater to
check if Line, Neutral and Earth are connected correctly. If this is the case, the
green light will glow when pushing on the switch. If the light does not glow,
check earth, line and neutral connections.
A burner reset switch with red indicator light is fi tted on the heater. To add a
remote reset button, make connections to the terminals in the electric box as
indicated on the wiring diagram.
IMPORTANT: If the reset button requires activating for any reason, the
cause must be determined. After determining and correcting the problem,
restart the heater and monitor long enough to ensure proper operation
(approx. 5 minutes).
An orange indicator light is fi tted on the heater to signify when the burner is on.
DANGER :
THIS APPLIANCE
MUST BE
EARTHED.
Thermostat
location
Do not attempt to control more than 1 air heater from a single thermostat or
control panel unless a properly wired relay is fi tted. Follow the instructions
supplied with such panels.
The location of the room thermostat or sensor is very important. It should not
be positioned on a cold wall or cold surface. Avoid location in draughty areas or
where it may be infl uenced by heat sources e.g. the sun, process plant, etc. The
thermostat should be mounted on a vibration free surface and mounted about 1,5
metres above fl oor level. Follow the thermostat manufacturers instructions. The
thermostat must be suitable for potential free contacts.
Ensure that all cables and installers wiring are fi xed to the gas pipe and that they
do not touch the combustion collector box.
