Nimbus Compact M NET R32 Installation Manual UK

Hydraulic connections

Hydraulic connections Key Symbol Description System flow Symbol Description Hydraulic circuit-breaker Symbol Description CUBE System return Communication connection Electrical connection Domestic cold water inlet Domestic hot water outlet Buffer Storage active Timer-controlled thermostat Lightbox Zone manager Refrigerant circuit Gas supply Circulation pump Shutter valve DHW expansion vessel System expansion vessel NTC RF 2-zone wired control module 2-zone wireless control module AB B A Diverter valve DHW 3-way mixing valve System 3-way mixing valve Safety valve Differential bypass valve Non-return valve Sludge filter Y-shaped filter Discharge outlet Syphon Plate heat exchanger Manifold Low-temperature heating zone Radiator Fan coil unit Dehumidifier External probe RF external sensor Gateway Sensys NET HD CUBE S NET RF receiver Heating only Cooling only Heating / Cooling Living room Sleeping area Delivery temperature sensor Return temperature sensor Anti-freeze kit Kit barrette CKZ puffer kit Thundish Hydraulic Kit CUBE RF Y-shaped filter kit Space heating supplementary heating element kit NOTE: installations with under-floor system In installations with under-floor heating, make sure that in all operating modes (the hot water switching mode in particular), the input temperature of the floor falls within the limits allowed for the application as specified in the national regulations. For installations with under-floor system, install a safety device on the heating delivery circuit, as specified in the national regulations. For the electrical connection of the thermostat, refer to the paragraph “Electrical connections”. If the delivery temperature is too high, the system stops in both domestic hot water and heating/cooling modes, and the remote control will report error code 936 “Under-floor safety thermostat open”. The system will start again when the manual-reset thermostat is closed. The input to be used as a connection to the under-floor safety thermostat is IN AUX 2 STE by default (function set through parameter 1.1.4). If the safety thermostat is connected to STE and the safety device intervenes, the circulation pump will continue to be fed and the anti-freeze protection is always guaranteed. If the safety thermostat is connected to STT and the safety device intervenes, the circulation pump will no longer be fed and the anti-freeze protection is not guaranteed. 32 / EN

Electrical connections 5. Electrical connections a a Carry out the electrical connections after having completed all the hydraulic connections. After the outdoor unit is switched off, it is necessary to wait at least 5 minutes to switch it on again. The indoor and outdoor units must be powered separately by observing the indications of the table. Moreover, a ATG BUS-type connection must be made between the indoor and outdoor units. This connection can be made using a cable with reduced cross-sectional size (0.75 mm 2 recommended cross-sectional size). Electrical circuit – The electrical system must satisfy all the requirements of the law in force. – Check that the mains power supply voltage and frequency are in line with the data indicated on the system’s data plate (see table). – For greater safety, ask a qualified technician to perform a thorough check of the electrical system. – We recommend verifying the presence of surge protection devices (SPDs) on the power supply line, in order to comply with the IEC 60364 standard and the national standards in force, and the presence of safety switches and residual-current circuit breakers in the electrical panels that power the indoor and outdoor units separately. – For the machine’s power supply we recommend using properly sized disconnection devices in compliance with the applicable regulations. – The power supply connection is a type-Y system and the connection cable should only be replaced by a qualified technical support centre, in order to avoid any damages. – Check that the electrical installation is adequate for supporting the power consumption of the installed units, as indicated on the appliances’ data plate. – The electrical connections must be made with the help of a fixed support (do not use portable socket-outlets) and fitted with a double pole switch, with a contact gap of at least 3 mm. – The system must be connected to an electrical system with an earthing device capable of ensuring the safety of the installation. – It is forbidden to use hydraulic connection pipes and pipes of the space heating system to earth the system. – The manufacturer is not liable for any damage caused by a system with inadequate earthing or electrical system anomalies. – Connect the power supply cable to a 230 V- 50 Hz (1 ph) or 400 V - 50 Hz (3 ph) network, while verifying that the pole markings match and the connections to earth (see table). EN / 33