Daikin REYQ8T7Y1B Installation And Operation Manual

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Daikin REYQ8T7Y1B Installation And Operation Manual Manual pdf 8 page image

4 PreparationInstallation and operation manual8REYQ8~20+REMQ5T7Y1BVRV IV system air conditioner4P353996-1E – 2018.04Outdoor unitcapacity type (HP)Piping outer diameter size (mm)Liquid pipe Suction gaspipeHighpressure/lowpressure gaspipe14~16 12.7 28.6 22.218 15.9 28.6 22.220~22 15.9 28.6 28.624 15.9 34.9 28.626~34 19.1 34.9 28.636 19.1 41.3 28.638~54 19.1 41.3 34.9D: Piping between refrigerant branch kits orrefrigerant branch kit and BS unitChoose from the following table in accordance with the indoor unittotal capacity type, connected downstream. Do not let theconnection piping exceed the refrigerant piping size chosen by thegeneral system model name.Indoor unit capacityindexPiping outer diameter size (mm)Liquid pipe Suction gaspipeHighpressure/lowpressure gaspipe<150 9.5 15.9 12.7150≤x<200 19.1 15.9200≤x<290 22.2 19.1290≤x<420 12.7 28.6420≤x<640 15.9 28.6640≤x<920 19.1 34.9≥920 41.3Example:▪ Downstream capacity for E=[capacity index of unit 1]▪ Downstream capacity for D=[capacity index of unit 1]+[capacityindex of unit 2]E: Piping between refrigerant branch kit or BS unitand indoor unitPipe size for direct connection to indoor unit must be the same asthe connection size of the indoor unit (in case indoor unit is VRV DXindoor or Hydrobox).Indoor unit capacityindexPiping outer diameter size (mm)Gas pipe Liquid pipe15~50 12.7 6.463~140 15.9 9.5200 19.1250 22.2▪ If a size-up of the piping is required, refer to the table below.a ebcda Outdoor unitb Main pipesc Increased First refrigerant branch kite Indoor unitSize upHP class Liquid piping outer diameter size (mm)5~8 9.5 → 12.71012+14 12.7 → 15.91618~22 15.9 → 19.12426~34 19.1 → 22.236~54▪ The pipe thickness of the refrigerant piping shall comply with theapplicable legislation. The minimal pipe thickness for R410Apiping must be in accordance with the table below.Pipe Ø (mm) Minimal thickness t (mm)6.4/9.5/12.7 0.8015.9 0.9919.1/22.2 0.8028.6 0.9934.9 1.2141.3 1.43▪ In case the required pipe sizes (inch sizes) are not available, it isalso allowed to use other diameters (mm sizes), taken thefollowing into account:▪ Select the pipe size nearest to the required size.▪ Use the suitable adapters for the change-over from inch to mmpipes (field supply).▪ The additional refrigerant calculation has to be adjusted asmentioned in "5.6.3 To determine the additional refrigerantamount" on page 16.4.2.3 To select refrigerant branch kitsRefrigerant refnetsFor piping example, refer to "4.2.2 To select the piping size" onpage 7.▪ When using refnet joints at the first branch counted from theoutdoor unit side, choose from the following table in accordancewith the capacity of the outdoor unit (example: refnet joint a).Outdoor unit capacity type(HP)3 pipes8~10 KHRQ23M29T912~22 KHRQ23M64T24~54 KHRQ23M75T▪ For refnet joints other than the first branch (example refnet joint b),select the proper branch kit model based on the total capacityindex of all indoor units connected after the refrigerant branch.Indoor unit capacity index 3 pipes<200 KHRQ23M20T200≤x<290 KHRQ23M29T9290≤x<640 KHRQ23M64T≥640 KHRQ23M75T▪ Concerning refnet headers, choose from the following table inaccordance with the total capacity of all the indoor units connectedbelow the refnet header.Indoor unit capacity index 3 pipes<200 KHRQ23M29H200≤x<290