Nimbus Plus S NET R32 Installation Manual UK

Electrical connections

Electrical connections Power supply connections Signal connections AL MB M1 L ‘ N ‘ ⏚ L1 L2L3 N ⏚ 1ph MODBUS GND A B ANODE +24V GND SE EBUS 2 TNK B T AL Power supply terminal board 1ph Connection to single-phase power supply AL L ‘ N ‘ ⏚ L1 L2L3 N ⏚ 3ph 1 Fig. 73 Fig. 74 Mb A Se TNK Bus Fig. 75 MB Modbus terminal board M1 Signal terminal board Mb Modbus connection between indoor and outdoor unit A Anode connection Se Outdoor sensor connection TNK Tank sensor connection Bus Interface connection (if the user interface is not mounted on the machine) i Make the connections of the TNK sensor and of the anode in case of the stand-alone tank. AL Power supply terminal board 3ph Connection to three-phase power supply 1 Remove the jumper (1) before making the three-phase connection. a Be careful to make the proper three-phase connection to prevent short-circuits. 44 / EN

IN G Electrical connections The cross-section and length of the cables must be sized according to the power indicated on the indoor unit’s data plate. a a Once you have completed the connections between the indoor and outdoor units, put both electrical panels back into place. Always keep the power and signal cables separate. Modbus terminal board and signal Power and STT terminal board M2 STT MB S01 M1 OUT AUX 2 OUT AUX 1 HV IN 1 HV IN 2 OUT AUX 4 AUX OUT 3 PM AUX V1 V2 N ⏚ L LC N LO LC N LO STT MODBUS GND A B S01 IN G OPEN ATG BUS DHW HEATER ANODE TA1 TA2 SE TNK EBUS2 THERM GND BUS +24V GND +24V GND B T RL FB STH IN IN AUX AUX 1 2 STE BUF N L 230V Fig. 77 Reference MODBUS Reference ANODE TA1 TA2 SE TNK EBUS 2 IN-AUX 1 IN-AUX 2 STE BUF OPEN THERM: DHW HEATER S01 a Fig. 76 Description Connection between indoor and outdoor unit Description Connection to the tank protection anode. Observe the electrical polarities. Contact room thermostat connection, zone 1. (Bridged by default). Room contact thermostat connection, zone 2. Outdoor temperature sensor connection. Tank sensor connection. BUS connection for system interface. Auxiliary input 1 connection (dry contact). Select the operating mode through parameter 1.1.3. Auxiliary input 2 connection (dry contact). Connection of the safety thermostat to EM board. Select the operating mode through parameter 1.1.4. It is set to under-floor safety thermostat by default and is bridged. Connection to the puffer sensor. Connection to thermostat Open - Therm Connection to the “Heating Element” accessory of the tank Connection of the terminals marked IN and G to the power measurement device. If a DHW indirect cylinder must be installed, make sure that the anode and the indirect cylinder sensor are properly connected on the terminal board. Reference OUT-AUX 1 / 2 / 3 / 4 HV input 1 HV input 2 PM AUX V1 V2 STT Reference Description Auxiliary output, dry contact. Select the operating mode through parameters 1.2.0/ 1.2.1 / 1.2.2 / 1.3.3. 230 V input. Select the operating mode through parameter 1.1.0. 230 V input. Select the operating mode through parameter 1.1.1. Auxiliary pump connection. Diverter valve connection for domestic water supply distribution network. Diverter valve connection for cooling circuit. Description Connection of the safety thermostat input to TDM board. 45 / EN