Nimbus Plus S NET R32 Installation Manual UK

Hydraulic and

Hydraulic and refrigerant connections 4.5 Refrigerant charging a a a a Before proceeding with the refrigerant charging operations, check that all the valves and cocks are shut. Charge the refrigerant only after having evacuated the pipes. Do not charge more refrigerant than necessary, as this may seriously undermine the refrigeration circuit’s operation. Only use R-32 refrigerant for charging the pipes. Do not mix the product with any other refrigerant. After evacuating the pipes, to introduce additional charge proceed as follows: – Make sure that you have shut off the connection between (A) and (C) ("Fig. 54"). – Connect the refrigerant cylinder. – Make sure that the pipes into which the refrigerant will be added have been evacuated. – Use a scale to add the additional charge as shown in the following table. REFRIGERANT QUANTITY Model NIMBUS EXT R32 UM 35 S 50 S 80 S & 80 S-T 120 S & 120 S-T 150 S & 150 S-T Nominal charge 1400 1800 1840 1840 g Extra gas recharge 40 40 50 50 g/m Gas pipe diameter 5/8 5/8 5/8 5/8 inch (inlet) Liquid pipe diameter (outlet) 3/8 3/8 3/8 3/8 inch – Disconnect the charge piping from the unit. – Open the shut-off valves (1) and (2) of the unit ("Fig. 54"). – Put the caps back onto the valves and tighten them properly. Attaching the refrigerant charge label – Fill in the label supplied with the kit. – Attach the label to the outdoor unit in a clearly visible position. 2 1 2 BP B C A AP R32 GWP: 675 2 1 1 1 2 2 kg kg kg A B C 4 Fig. 55 3 Fig. 54 A B C The refrigerant charge added in the factory (see data plate with the name of the unit). The quantity of additional refrigerant added on-site (if necessary). The total refrigerant charge 1 Liquid-side flare valve 2 Gas-side flare valve 3 Vacuum pump 4 Refrigerant cylinder BP Low pressure warning AP High pressure 32 / EN

Hydraulic and refrigerant connections 4.6 Recovering refrigerant in the outdoor unit Recovering the refrigerant allows for accumulating the latter in the outdoor unit before disconnecting the cooling system. – Unscrew the caps (1) of the flare valves. 1 Fig. 56 – Set the device to cooling mode and select the Pump Down (13.6.0) parameter from the user interface. – Connect the pressure gauge (2) to the service socket (3) of the gas-side flare valve. – Close the liquid-side flare valve (4) using a spanner. 4.7 Indoor unit hydraulic connections Preliminary checks: a – Check that the system has been cleaned; – Check that there are no impurities in the circuit water; – Check that compatible components are used (e.g. do not connect copper and steel to each other); – Check that the connection to the heating system has been made correctly; – check that the water supply distribution network pressure does not exceed 0.5 MPa (5 bar), otherwise install a pressure reducer at the system's intake; – check that a disconnect device with cock is installed between the system and the domestic water supply distribution network (if present); – check that the supplied expansion vessel is large enough to handle the water in the system and, if necessary, install an additional one; Remove the rubber protective caps before making the hydraulic connections. The plugs are used exclusively as a protective device during transport. After the checks: – Mount the quick couplings (present inside the machine) on the water pipes (1) and (2). 2 2 3 4 1 Fig. 58 Fig. 57 – When the reading on the pressure gauge is “0”, make sure that this value is maintained for 2 minutes. – Close the gas-side flare valve using a spanner and switch the appliance off. – Screw on the caps (1) of the flare valves. – After having disconnected the pipes, protect them against dust. After completing the refrigerant recovery procedure, the outdoor unit remains in the error status (the error will be removed through parameter 13.13.1 Service Reset). 33 / EN