Nimbus M NET R32 Hybrid Installation Manual UK

Hydraulic connections

Hydraulic connections 4.1.3 Characteristics of the supply water Make sure that the system is supplied with water having a hardness between 8°F and 15°F and conductivity below 500 μS/cm. In zones where the water is particularly hard, mount a water softener. Where the filling water is aggressive (the pH should be maintained between 6.6 and 8.5), ferruginous or hard, use treated water to prevent scale deposits, corrosion, and damage to the appliance. Even a slight amount of impurities in the water may lower the system’s performances. 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. 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 i 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. We recommend using a dirt separator filter on the return circuit to protect the heat pump units, where supplied. 4.1.4 Filling the system During filling, make sure that all the air is purged from the system. If the system’s pressure drops excessively, load water. a a a To check the system water pressure, install a pressure gauge on the system as it is not present in the product. The system’s pressure can nonetheless be read through the system interface (parameter 1.16.7). The installation, initial start up, and configuration must be carried out in accordance with the instructions, by a qualified technician only. The manufacturer declines all responsibility for damages caused to people, animals or possessions following incorrect installation of the appliance. 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. 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. The maximum pressure of the heating/cooling system is 0.3 MPa (3 bar). 26 / EN

L Hydraulic connections 4.2 Schematic hydraulic diagram Layout for heating OR Fig. 41 Hybrid Manager For compatible boilers only, in alternative to OUT AUX 1 connection for generic Boilers OG BU CN8 N 1ph S G OR EH1 EH1 ST1 ST1 L N EH1 EH1 ST1 ST1 L1 L2 L3 1ph 3ph N OG BU T BUS Boiler P.C.B. B S01 OPEN ATG BUS ANODE IN G THERM GNDBUS TA1 TA2 +24V GND SE TNK EBUS2 B T IN AUX 1 IN AUX 2 STE BUF OUT OUT HV HV OUT OUT PM AUX AUX2 AUX1 IN1 IN2 AUX4 AUX3 N ⏚ L TA Generic Boiler P.C.B. V1 LC N LO V2 LC N LO Fancoil: Z0 OR Underfloor Heating: Z1 CHILLER BOILER Fancoil: Z1 a a i Fig. 42 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. 27 / EN