Nimbus Pocket M NET R32 Installation Manual UK

Hydraulic connections

Hydraulic connections NOTE: Installation of a tank for the production of Domestic Hot Water When a tank is installed to produce domestic hot water, the installer must verify and provide evidence of conformity with respect to the following regulations: – The Building Regulations 2010 (S.I. 2010 No. 2214), as amended; – The Water Supply (Water Fittings) Regulations 1999 (S.I. 1999 No. 1148), as amended. It is possible to connect the tank probe to the system (thermostatic control device). Connect the tank probe "TNK" to the "M2 terminal Board" as shown in the chapter "Electrical connections", paragraph "Indoor unit electrical connections". The NTC probe shall meet the following requirements: R(25°C)=10KΩ, β=3977 . Acting on the system interface, change the configuration of the energy manager for the Tank Managment ("1.0.2 Tank management", item: "1 Storage tank with NTC sensor"). See chapter ”Commissioning”, paragraph “technical parameters”. During operations, if the temperature measured by the tank probe exceeds 80°C, error 935 is displayed on the interface. In this case the heat sources from the heat pump to the tank are switched off. 24 / 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) in the power supply line, for satisfying IEC 60364 and the national standards in force , and the presence of safety switches and residual-current circuit breakers in the electrical panels that supply the indoor and outdoor units separately. We nonetheless recommend installing a SPD even if in the event of a low level of risk resulting from the CRL. – 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). 25 / EN