Technical data

0803UDSA-2GBEN, Pag. 16/36
11. Electrical
supply and
connections
The electrical installation may only be carried out by an appropriately qualified
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 figure 9). Screw type terminals are provided. Connections should be in
accordance with the terminal markings and the wiring diagram affixed 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 flame 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 burner reset switch with red indicator light is fitted 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 fitted 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 fitted. 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 influenced 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 floor level. Follow the thermostat manufacturers instructions. The
thermostat must be suitable for potential free contacts.
Ensure that all cables and installers wiring are fixed to the gas pipe and that they
do not touch the combustion collector box.