Electrical Connections - Riello TAU 55 UNIT Installation And Maintenance Manual

TAU UNIT condensing boilers are fully wired in the factory. Only the following electrical connections remain to be made:
- mains electricity supply;
- room thermostat;
- outdoor temperature sensor;
- storage cylinder pump (if relevant).
Proceed as follows to make these connections:
- Remove the front and top panels from the boiler.
- Unscrew the screws (1). Loosen but do not remove the screws (2), and lower the control panel.
- Connect up the connector (3) and plug it into its socket (4) in the rear of the control panel.
Once you have made all the necessary connections, close the control panel, reversing the steps followed to open it.
See pages 38 and 39 for information on how to connect the temperature sensors and pumps.
2
b
The following instructions are mandatory:
1 - Use a multi-pole magnetic thermal trip switch
and disconnector conforming to IEC-EN stand-
ards (with a contact gap of at least 3 mm);
2 - Respect the L1 (Phase) - N (Neutral) and PE
(ground) connections. Keep the ground wire
about 2 cm longer than the power wires.
3 - Use cables with a cross section of 1.5 mm
more, complete with end terminals;
4 - Always refer to the electrical wiring diagrams
in this manual when performing any electrical
work.
5 - Make sure the appliance is connected to an effi-
cient ground.
1
2
1
2

ELECTRICAL CONNECTIONS

4
a
It is strictly forbidden to use fuel and/or water pipes to
ground the appliance.
a
Do not route the power cable or room thermostat
cables near hot surfaces (like heating circuit flow
pipes). Use a suitable class of cable if there is any
possibility of contact with parts at temperatures
or
above 50°C.
The manufacturer declines all responsibility
for damage caused by failing to ground the
appliance adequately or by failure to respect
the wiring diagrams provided in this manual.
TA
L3 N PE
3
230V~50Hz
35
INSTALLER