Riello NXHM - Field Wiring Guidelines; Precautions on Wiring of Power Supply; Outdoor Unit Power Supply

94
ENGLISH
NOTE
Please use H07RN-F for the power wire, all the cable are connect to high voltage except for thermistor cable and cable for user interface.
 Equipment must be grounded.
 All high-voltage external load, if it is metal or a grounded port, must be grounded.
 All external load current is needed less than 0.2A, if the single load current is greater than 0.2A, the load must be controlled through
AC contactor.
 "AHS1" "AHS2", "A1" "A2", "R1" "R2" and "DFT1" "DFT2" wiring terminal ports provide only the switch signal. Please refer to image of
9.7.6 to get the ports position in the unit.
 Expansion valve E-Heating tape, Plate heat exchanger E-Heating tape and Flow switch E-Heating tape share a control port.
Code Assembly unit
1 High voltage wire hole
2 Low voltage wire hole
3 High voltage or low voltage wire hole
4 Water outlet
5 Water inlet
6 Drain outlet
7 Drainage pipe hole (for safety valve)
67
1
3
2
4
5
Field wiring guidelines
 0RVW¿HOGZLULQJRQWKHXQLWLVWREHPDGHRQWKHWHUPLQDOEORFNLQVLGHWKHVZLWFKER[7RJDLQDFFHVVWRWKHWHUPLQDOEORFNUHPRYH
the switch box service panel.
b
WARNING
6ZLWFKRႇDOOSRZHULQFOXGLQJWKHXQLWSRZHUVXSSO\DQGEDFNXSKHDWHUDQGGRPHVWLFKRWZDWHUWDQNSRZHUVXSSO\LIDSSOLFDEOHEHIRUHUHPRYLQJ
the switch box service panel.
 Fix all cables using cable ties.
 A dedicated power circuit is required for the backup heater.
 ,QVWDOODWLRQVHTXLSSHGZLWKDGRPHVWLFKRWZDWHUWDQN¿HOGVXSSO\UHTXLUHDGHGLFDWHGSRZHUFLUFXLWIRUWKHERRVWHUKHDWHU3OHDVH
refer to the domestic hot water tank Installation & Owner's Manual. Secure the wiring in the order shown below.
 Lay out the electrical wiring so that the front cover does not rise up when doing wiring work and attach the front cover securely.
 Follow the electric wiring diagram for electrical wiring works (the electric wiring diagrams are located on the rear side of door).
 ,QVWDOOWKHZLUHVDQG¿[WKHFRYHU¿UPO\VRWKDWWKHFRYHUPD\EH¿WLQSURSHUO\
9.7.3 Precautions on wiring of power supply
Use a round crimp-style terminal for connection to the power supply terminal board. In case it cannot be used due to unavoidable reasons, be
sure to observe the following instructions.
 'RQRWFRQQHFWGLႇHUHQWJDXJHZLUHVWRWKHVDPHSRZHUVXSSO\WHUPLQDO/RRVHFRQQHFWLRQVPD\FDXVHRYHUKHDWLQJ
 :KHQFRQQHFWLQJZLUHVRIWKHVDPHJDXJHFRQQHFWWKHPDFFRUGLQJWRWKH¿JXUHEHORZ
 Use the correct screwdriver to tighten the terminal screws. Small screwdrivers can damage the screw head and prevent appropriate
tightening.
 Over-tightening the terminal screws can damage the screws.
 Attach a ground fault circuit interrupter and fuse to the power supply line.
 ,QZLULQJPDNHFHUWDLQWKDWSUHVFULEHGZLUHVDUHXVHGFDUU\RXWFRPSOHWHFRQQHFWLRQVDQG¿[WKHZLUHVVRWKDWRXWVLGHIRUFHFDQQRW
DႇHFWWKHWHUPLQDOV
9.7.4 6SHFL¿FDWLRQVRIVWDQGDUGZLULQJFRPSRQHQWV
Door 1: compressor compartment and electrical parts: XT1.
NOTE
The ground fault circuit interrupter must be a high-speed type breaker
of 30 mA (<0,1 s).
POWER SUPPLY
380VAC~3N
FUSE
LPS
L1
L2
L3
N
1L1L2L2L3L3LN
KCALBKCALB
EULBEULBYARGYARG
NWORBNWORB
OUTDOOR UNIT POWER SUPPLY
Unit 18 kW 22 kW 26 kW 30 kW
Maximum overcurrent
protector (MOP)
18 21 24 28
Wiring size (mm²) 6666
Stated values are maximum values (see electrical data for exact
values)