Electrical Connections - Riello TAU Unit 50 Installation And Maintenance Manual

2.11 Electrical connections

Condensing thermal units TAU Unit leave the factory fully wired
and require only the connection of power cord and accessories,
according to the system configuration.
Proceed as follows to make these connections:
− Remove the front panel from the boiler
− Loosen the screws (1)
− Open the door (2)
2
− Find the power terminal board (MO2).
− Perform the electrical connections following the indica-
tions below.
− Use the relevant cable glands placed on the rear side of
the electric panel and of the thermal unit to route the
power cord.
MO2
21 L
230 V -
20
N
50 Hz
⏚
19
18
17
16
15
L Live
N Neutral
Earth/ground
Once you have made all the necessary connections, close the
control panel, reversing the steps followed to open it.
1
MO2
MO2
MO1
MO1
9
The following is mandatory:
− The use of an omnipolar magnetothermic switch, line
disconnecting switch in compliance with CEI-EN stand-
ards (contact opening of at least 3 mm)
− Respect the connection L (line) - N (neutral). Keep the
earth conductor 2 cm longer than the power supply con-
ductors
− Use cables with a section greater than or equal to 1.5
mm , complete with cable terminal caps
2
− Refer to the wiring diagrams in this manual for all electric
operations
− Connect the equipment to an effective earthing system.
0
It is strictly forbidden to use pipes of any kind to ground the
appliance.
0
It is prohibited to lay power supply and room/heat demand
thermostat cables near hot surfaces (delivery pipes). If they
may come into contact with parts that have a temperature
of over 50°C, use a suitable type of cable.
The manufacturer is not responsible for any damage caused by
failure to earth connect the device and failure to comply with
what is indicated in the wiring diagrams.
9
For the connection of the devices connected to the jig
(pumps, circulators and diverting / mixing valves) use inter-
posed relays unless the maximum absorption of all compo-
nents connected to the board (including the module circu-
lator) is less than or equal to 1.5 A. Relays sizing lays on the
installer depending on the type of connected device.
9
For the electrical connections, use H05-VV-F power cables
with a minimum cross-section of 1.5 mm
terminal ferrules. For the low voltage connections, use H05-
VV-F power cables with a minimum cross-section of be-
tween 0.5 and 1 mm
For connection, see the following figure:
~ 230 V
( )
N
MO2
101 102 103 104 105 106 107 108 109 110 111 112 113 114 115
S1 Circuit breaker
RA Relay / Switch (230V AC)
(*) Refer to the device type for the supply tension.
− Perform the electrical connections following the indica-
tions below.
− Use the relevant cable glands placed on the rear side of
the electric panel and of the thermal unit to route the
connection cables.
23
INSTALLATION
, complete with
2
, complete with terminal ferrules.
2
RA
0
1
S1