Daikin RYYQ8T7Y1B Installation And Operation Manual

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Daikin RYYQ8T7Y1B Installation And Operation Manual Manual pdf 18 page image

Installation and operation manual13 RYYQ+RYMQ+RXYQ8~20T7Y1BVRV IV System Air Conditioner4P329765-1 – 2012.099.4. Selection of refrigerant branch kitsRefrigerant refnetsFor piping example, refer to "9.3. Selection of piping size" onpage 11. 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). For refnets joints other than the first branch (example refnet jointb), select the proper branch kit model based on the total capacityindex of all indoor units connected after the refrigerant branch. Concerning refnet headers, choose from the following table inaccordance with the total capacity of all the indoor unitsconnected below the refnet header. How to choose an outdoor multi connection piping kit (needed ifthe outdoor unit capacity type is 22 HP or more). Choose fromthe following table in accordance with the number of outdoorunits.The RYYQ22~54 models, consisting of two or three RYMQ modules,require a 3-pipe system. There is an additional equalizing pipe forsuch modules (in addition to the conventional gas and liquid piping).This equalizing pipe does not exist for RYYQ8~20 or RYXQ8~54units.The equalizing pipe connections for the different RYMQ modules arementioned in below table.Deciding the equalizing pipe diameter: In case of 3 multi units: the connection diameter of outdoor toT-joint has to be kept. In case of 2 multi units: the connection pipe has to have thelargest diameter.There is never a connection of the equalizing pipe with the indoorunits.Example (free multi combination): RYMQ8+RYMQ12+RYMQ18.Largest connection is Ø28.6 (RYMQ18); Ø22.2 (RYMQ12) andØ19.1 (RYMQ8). In figure below only equalizing pipe is shown.9.5. System piping (length) limitations9.5.1. Piping length restrictionsMake sure to perform the piping installation within the range of themaximum allowable pipe length, allowable level difference andallowable length after branching as indicated below. Three patternswill be discussed, including VRV DX indoor units combined withHydrobox units or RA DX indoor units.DefinitionsActual piping length: pipe length between outdoor (1) and indoor units.Equivalent piping length (2) : pipe length between outdoor(1) andindoor units.Total piping length: total piping length from the outdoor (1) to all indoorunits.Difference in height between outdoor and indoor units: H1.Difference in height between indoor and indoor units: H2.Difference in height between outdoor and outdoor units: H3.Difference in height between outdoor and BP unit: H4.Difference in height between BP unit and BP unit: H5.Difference in height between BP unit and RA DX indoor unit: H6.Outdoor unit capacity type (HP) 2 pipes8-10 KHRQ22M29T912-22 KHRQ22M64T24-54 KHRQ22M75TIndoor unit capacity index 2 pipes<200 KHRQ22M20T200≤x<290 KHRQ22M29T9290≤x<640 KHRQ22M64T≥640 KHRQ22M75TIndoor unit capacity index 2 pipes<200 KHRQ22M29H200≤x<290 KHRQ22M29H290≤x<640 KHRQ22M64H (a)(a) If the pipe size above the refnet header is Ø34.9 or more, KHRQ22M75H isrequired.≥640 KHRQ22M75HINFORMATIONMaximum 8 branches can be connected to a header.Number of outdoor units Branch kit name2 BHFQ22P10073 BHFQ22P1517RYMQ Equalizing pipe Ø (mm)8 19.11022.212141618 28.620INFORMATIONReducers or T-joints are field supplied.NOTICERefrigerant branch kits can only be used with R410A.INFORMATIONEqualizing pipe for RYMQ has to be connected betweenthe outdoor modules of multi continuous heating models:RYYQ22~54 consisting of 2 or 3 RYMQ8~20 modules. Theequalizing pipe should never have a connection to anyindoor unit.(1) If the system capacity is >20HP, re-read "the first outdoor branch as seenfrom the indoor unit".(2) Assume equivalent piping length of refnet joint=0.5 m and refnetheader=1 m (for calculation purposes).Ø22.2 mmØ28.6 mm Ø19.1 mm