Nimbus Plus M NET R32 Installation Manual UK

Electrical connections

Electrical connections – Pass the power cables (4) through the cable gland (5). – Pass the signal cables (6) through cable grommet (7). – Use the cable ties (8) to guide the cables (6). – Pass the power cables (9) of the loads through the cable hole (10) and secure them with the cable tie (11). 7 10 11 8 6 8 5 9 i 4 Fig. 54 If necessary, cut a small hole in the cable hole to facilitate the insertion of cables. Avoid excessively large holes so as to prevent air from flowing inside the appliance. HV IN 2 N Power supply connections AL ⏚ ⏚ L1 L2L3 N 1ph L ‘ N ‘ Fig. 56 AL 1ph Power supply terminal board Connection to single-phase power supply AL ⏚ ⏚ L1 L2L3 N L ‘ N ‘ 3ph 1 Fig. 57 M1 STT AL M2 L’ N’ L1 L2 L3 STT OUT PM AUX V1 V2 AUX 3 N L LC N LO LC N LO OUT AUX 4 2 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. Signal connections MODBUS SO1 OPEN ATG BUS DHW HEATER ANODE EBUS2 IN IN AUX2 GND A B IN G THERM GND BUS +24 V GND RL FB STH +24 V GND TA1TA2 SE TNK B T AUX 1 STE BUF 1 OUT OUT HV AUX 2 AUX 1 IN 1 M1 M1 Signal terminal board M2 230 V terminal board AL Power supply terminal board STT STT terminal board 1 Signal connections 2 230 V connections Fig. 55 Note: secure the cables inside the appliance using the collars. M1 ATG A Se TNK Bus i ATGBUS ANODE GND BUS +24 V +24 V ATG A EBUS 2 SE TNK B T Se TNK Bus Fig. 58 Signal terminal board ATG Bus connection between indoor and outdoor units Anode connection Outdoor sensor connection Tank sensor connection Interface connection (if the user interface is not mounted on the machine) Make the connections of the TNK sensor and of the anode in case of the stand-alone tank. 34 / EN

GND A B IN G THERM GND BUS +24 V GND RL FB STH +24 V GND B T AUX 1 STE HV HV GND A B IN G THERM GND BUS +24 V GND RL FB STH +24 V GND B T AUX 1 STE N N’ L’ HV HV 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. Power terminal board MODBUS SO1 OPEN ATG BUS DHW HEATER ANODE EBUS2 IN IN AUX2 TA1TA2 SE TNK BUF M2 L3 L2 Signal terminal board M1 OUT AUX 4 L1 OUT PM AUX V1 V2 AUX 3 N L LC N LO LC N LO OUT PM AUX V1 V2 AUX 3 N L LC N LO LC N LO 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 IN 2 OUT AUX 2 OUT AUX 4 IN 2 IN 1 OUT AUX 1 MODBUS SO1 OPEN ATG BUS DHW HEATER ANODE EBUS2 IN IN AUX2 TA1TA2 SE TNK BUF IN 1 OUT AUX 1 OUT AUX 2 N L 230V S01 IN G Reference ANODE TA1 TA2 SE TNK EBUS 2 IN-AUX 1 IN-AUX 2 STE BUF OPEN THERM DHW HEATER ATGBUS S01 a 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 Fig. 59 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. Connection of auxiliary input 2 (dry contact). Connection of the safety thermostat to the EM board. Select the operating mode through parameter 1.1.4. By default it is set to under-floor safety thermostat and is bridged. Connection to the puffer sensor. Connection to thermostat Open - Therm Connection to the “Heating Element” accessory of the tank Connection between indoor and outdoor unit 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 Fig. 60 Description Auxiliary output, potential-free contact. Select the operating mode through parameters 1.2.0/ 1.2.1 / 1.2.2 / 1.2.3. 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. EN / 35