Daikin VRV 5 RXYA8A7Y1B Installation And Operation Manual

Also see for VRV 5 RXYA10A7Y1B: Installer and user guide

16 Charging refrigerantInstallation and operation manual38RYMA5+RXYA8~20A7Y1BVRV 5 heat pump4P739915-1 – 2023.1216.4 To charge refrigerant: Flow chartFor more information, see "16.5 To charge refrigerant" [438].Step 1Calculate additional refrigerant charge amount: R (kg)Step 4cRefrigerant overcharge happened, recoverrefrigerant to reach Q=RStep 2+3• Close valve A• Open valve B to the liquid line• Execute pre-charging amount: Q (kg)Step 4b• Close valve B• Charging is finished• Fill in the amount on the additional refrigerant chargelabel• Input the additional refrigerant amount via setting [2-14]• Go to test runQ Q>RQ=Rp< p>A BR32dStep 4aClose valve BStep 5• Connect valve A to the refrigerant charge port (d)• Open all outdoor unit stop valvesStep 6Activate field setting [2-20]=1Unit will start manual refrigerant charging operation.Step 7• Open valve A• Charge remaining amount of refrigerant P (kg)R=Q+PStep 8• Close valve A• Push BS3 to stop manual charging• Charging is finished• Fill in the amount on the additional refrigerant charge label• Input the additional refrigerant amount via setting [2-14]• Go to test run16.5 To charge refrigerantTo speed up the refrigerant charging process, it is in case of largersystems recommended to first pre-charge a portion of refrigerantthrough the liquid line before proceeding with the manual charging. Itcan be skipped, but charging will take longer then.Pre-charging refrigerant1 Calculate the additional amount of refrigerant to be added usingthe formula mentioned in "16.3 To determine the additionalrefrigerant amount" [437].Note: The first 10 kg of additional refrigerant can be pre-chargedwithout outdoor unit operation.Note: Pre-charging can be done without compressor operationPrerequisite: Make sure that all outdoor unit stop valves andmanifold valve A are closed. Disconnect the manifold from the gaslines.2 Connect the manifold valve B to the service port of the liquidstop valve.3 Pre‑charge refrigerant until the determined additional refrigerantamount is reached or pre‑charging is not possible anymore.