Riello NXHM - Precautions on Electrical Wiring Work; Wiring Overview

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ENGLISH
9.7.1 Precautions on electrical wiring work
 Fix cables so that cables do not make contact with the pipes (especially on the high pressure side).
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high-pressure side.
 Make sure no external pressure is applied to the terminal connectors.
 When installing the ground fault circuit interrupter make sure that it is compatible with the inverter (resistant to high frequency electrical
noise) to avoid unnecessary opening of the ground fault circuit interrupter.
NOTE
The ground fault circuit interrupter must be a high- speed type breaker of 30 mA (<0.1 s).
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but also may cause abnormal heating of the capacitor due to high-frequency waves. Never install a phase advancing capacitor as it
could lead to an accident.
9.7.2 Wiring overview
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examples".
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A
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DE
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N
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P
2 3
Code Assembly unit
A Outdoor unit
B 6RODUHQHUJ\NLW¿HOGVXSSO\
C User interface
D 5RRPWKHUPRVWDW¿HOGVXSSO\
E %RLOHU¿HOGVXSSO\
F PUMP_S6RODUSXPS¿HOGVXSSO\
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¿HOGVXSSO\
I PUMP_D'+:SXPS¿HOGVXSSO\
J SV2ZD\YDOYH¿HOGVXSSO\
K
SV1: 3-way valve for domestic hot water tank
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L Domestic hot water tank
M Booster heater
N Contactor
O Power supply
P Zone2 SV3 (3-way valve)
Item Description AC/DC
Required number of
conductors
Maximum running
current
1 Solar energy kit signal cable AC 2 200mA
2 User interface cable AC 5 200mA
3 Room thermostat cable AC 2 or 3 200mA(a)
4 Boiler control cable
 2 200mA
5 Thermistor cable for Tw2 DC 2 (b)
9 DHW pump control cable AC 2 200mA(a)
 3-way valve control cable AC 2 or 3 200mA(a)
12 Thermistor cable for T5 DC 2 (b)
13 Booster heater control cable AC 2 200mA(a)
15 Power supply cable for unit AC 3+GND (c)
(a) Minimum cable section AWG18 (0.75 mm
2
).
(b) The thermistor and connection wire (10m) are delivered with the domestic hot water tank (T5) or zone 2 outlet temperature (Tw2).
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