Riello 20010820, Installation, Operation And Maintenance Manual, Page: 12 / 20

12
b
The following instructions are mandatory:
1 - Use a single pole magnetic thermal trip switch
and disconnector conforming to IEC-EN stan-
dards (with a contact gap of at least 3 mm);
2 - Respect the L (Phase) - N (Neutral) polarity.
Keep the ground wire about 2 cm longer than the
power wires.
3 - Use cables with a cross section of 1.5 mm
2
or
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
effective ground.
- Proceed as instructed in the “ACCESSING INTERNAL
COMPONENTS” section above to access the terminals
inside the control panel.
- Route the connection cables through the cable grom-
mets in the casing of the boiler or secured by the side
mounting bracket. Alternatively, use the holes provided
for cable glands or spiral sleeving. To use these holes,
push out the pre-formed hole covers in the correspon-
ding positions on the control panel.
- See the “WIRING DIAGRAMS” section for information
on how to connect up the individual devices.
- Tighten the screws on the cable clamps and screw up
the cable glands to secure the cables against pulling.
Secure the cables to the casing of the boiler as neces-
sary.
b
Use the terminals provided to connect all 230 V
power users to ground.
a
It is strictly forbidden to use gas 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
above 50°C.
The manufacturer declines all responsibility for dama-
ge caused by failing to ground the appliance adequa-
tely or by failure to respect the wiring diagrams pro-
vided in this manual.
All electrical connections must be made by a legally qualified heating engineer according to the following instructions.
(In Italy heating engineers are regulated by law 37 of the 22/01/2008.)
ELECTRICAL CONNECTIONS
L1 N PE
BURNER CH PUMP
T1 T2 S3 L1 N PE1
Power supply
PE N L
TA
Cable glands “ A ”
Boiler
temperature
gauge sensor
Minimum
temperature
thermostat
sensor
Tm
Control
thermostat
sensor
Safety
thermostat
sensor
Cable glands “ B ”
TR
TS
TeC