Nimbus Pocket M NET R32 Installation Manual UK

Electrical connections

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. Vertical signal terminal board M1 OPEN THERM ATG BUS HC FLOW PS DHW HEATER Reference ANODE TA1 TA2 SE TNK EBUS IN-AUX 1 IN-AUX 2 STE BUF S01 230 V terminal board 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 of the terminals marked IN and G to the power measurement device. Fig. 44 Reference OPEN THERM ATGBUS HC FLOW PS DHW HEATER Description Connection to thermostat Open - Therm Connection between indoor and outdoor unit HC flow temperature sensor Pressure switch Connection to the “Heating Element” accessory of the tank M3 Left signal terminal board OUT AUX 2 OUT AUX 1 HV IN 1 HV IN 2 OUT AUX 4 OUT AUX 3 PM AUX V1 V2 N L 230V Fig. 46 M2 ANODE TA1 TA2 SE TNK EBUS IN AUX 1 IN AUX 2 STE BUF Fig. 45 Reference OUT-AUX 1 / 2 / 3 / 4 HV input 1 HV input 2 PM AUX V1 V2 a 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. Once you have completed the connections between the indoor and outdoor units, put both electrical panels back into place. 30 / EN

5.3 Example of electrical connection between indoor and outdoor units Electrical connections Before carrying out any work on the system, shut off the power supply at the main switch. The electrical connection between the indoor and outdoor units must be made using the two low-voltage terminal boards: G and S. Connect “G” on the indoor unit terminal board with “G” on the outdoor unit terminal board. Connect “S” on the indoor unit terminal board with “S” on the outdoor unit terminal board. 1 ph 3 ph 1 ph 3 ph T T T T ON ON ON ON OFF 30mA N XXA N XXA N OFF 30mA N N XXA N XXA OFF 30mA N XXA N XXA N OFF 30mA N N XXA N XXA M3 M1 M2 S G ANODE TA1 TA2 SE TNK EBUS IN AUX 1 IN AUX 2 G S STE BUF M1 Indoor unit vertical signal terminal board M2 Indoor unit left signal terminal board M3 Outdoor unit signal terminal board 1 ph Single-phase power supply (depending on the model) 3 ph Three-phase power supply (depending on the model) a a Fig. 47 Once you have completed the connections between the indoor and outdoor units, put both electrical panels back into place. Keep the high- and low-voltage cables separate. 31 / EN