Nimbus Plus M NET R32 Installation Manual UK

Hydraulic connections

Hydraulic connections 4.1.7 Characteristics of the supply water Make sure that the system is supplied with water having a hardness between 4.5°dH (8°fH) and 8.4°dH (15°fH) and conductivity below 500μS/cm. In zones where the water is particularly hard, mount a water softener. If the system is filled with water that is aggressive (the pH should be maintained between 7.5 and 9), ferruginous or hard, use treated water to prevent limescale build-up, corrosion and damages to the appliance. Even a slight quantity of impurities in the water may decrease system performance. The filling water used must strictly be treated in the case of high-capacity installations (high volumes of water) or if frequent water top-ups are required to maintain a constant level of liquid in the system. If the system must be cleaned, fill it completely with treated water. Glycol adversely affects the appliance’s performances and we strongly advise not to use it. If glycol is nonetheless used, ARIS- TON shall not be held liable for any loss of efficiency of the system and recommends dosing it properly and performing maintenance. 4.1.8 Filling the system During filling, it may not be possible to remove all the air from the system. The residual air will be removed through the automatic air relief valves during the initial hours of operation of the system. If the system’s pressure drops excessively, fill the circuit with water. a a The installation, initial start up, and configuration must be carried out in accordance with the instructions, by qualified and competent installer only. The manufacturer declines all responsibility for damages caused to people, animals or possessions following incorrect installation of the appliance. During initial filling of the system, check the outflow of water from the automatic relief outlet. The water outflow makes the sealing discs inside the valve work effectively. We recommend performing the operation with a cloth to absorb the excess water. To speed up filling of the system, the system can be deaerated manually as follows: – Mount the pipe (1) supplied on the manual deaerator outlet. – Open the manual deaerator (2) and channel the water towards the outside the machine. – Deaerate the system for a few minutes until all the air has been removed from the pipes. – Close the deaerator. a 2 1 Fig. 44 The accumulation of air can cause malfunctions to the system and damage the components. Note: during the initial start-up the automatic deaeration function is activated, which is necessary to ensure the system’s correct operation. The activation of the automatic deaeration cycles of the system following the initial start-up can be performed using the Air-purge function 1.12.0 command. a The indoor unit contains a pressure gauge which can be accessed by the installer during the first filling phase. The system’s pressure can nonetheless be read through the system interface (parameter 1.16.7). If the interface is not installed on the machine, we recommend using an external pressure gauge to check the pressure and allow the user to fill the system with water. Check the water pressure on the pressure gauge regularly and make sure that the pressure is between 0.05 MPa (0.5 bar) and 0.15 MPa (1.5 bar) when the system is cold. If the pressure is below the minimum value, it must be increased through the filling cock. Close the cock once the average value of 0.12 MPa (1.2 bar) has been reached. The minimum pressure of the heating/cooling system is 0.05 MPa (0.5 bar). The maximum pressure of the heating/cooling system is 0.3 MPa (3 bar). a If frequent fillings (once a month or more frequently) are required for your system, this indicates a potential problem with the installation (leaks, expansion vessel problems). Contact your trusted installer to analyse and solve the problem quickly, and to prevent damage caused by corrosion of the components due to excessive water replacement in the system. 26 / EN

Hydraulic connections 4.2 Example of schematic hydraulic diagram A B AB A AB B OR Fig. 45 L1 L2 L3 N 1ph OR L2 OUT PM AUX V1 V2 AUX 3 N L LC N LO LC N LO L1 L2 L3 N 3ph BK BL BN B AB A HV IN 1 HV IN 2 OUT AUX 4 L’ N’ L3 N STT L1 S G 1ph OR EH1 EH1 ST1 ST1 L N EH1 EH1 ST1 ST1 L1 L2 L3 3ph N IN S01 G OPEN ATG BUS DHW HEATER ANODE EBUS2 IN IN AUX B T 2 STE TA1 TA2 SE TNK BUF THERM AUX 1 OUT OUT AUX 2 AUX 1 Fancoil: Z0 OR Underfloor Heating: Z1 ANODE +24V CHILLER BOILER Fancoil: Z1 a a i Fig. 46 It is forbidden to disconnect the power supply to the unit if the outdoor temperature can fall below ZERO (risk of frost). Drain the central heating and domestic hot water systems to prevent the risk of ice forming. Do not remove the heating delivery temperature sensor (inside the heating elements). Carry out the electrical connections after having completed all the hydraulic connections. EN / 27