Daikin RWEYQ8T8Y1B Installation And Operation Manual

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Installation and operation manual32 RWEYQ8+10T8Y1BVRV-W IV System Air Conditioner4P399208-1 – 2015.01When selecting indoor units, the connection ratio (CR) has to be keptwithin limitations: 50%≤CR≤130%.More detailed information can be found in the technical engineeringdata.16.4. Method for adding refrigerantBe sure to charge the specified amount of refrigerant in liquid state.Since this refrigerant is a mixed refrigerant, adding it in gas form maycause the refrigerant composition to change, preventing normaloperation.1. Before charging, check whether the refrigerant cylinder isequipped with a siphon tube or not.2. Be sure to use tools exclusively for R410A to ensure requiredpressure resistance and to prevent foreign materials from mixinginto the system.A. Additional refrigerant charge procedure by normal way3. After the vacuming drying is finished, charge the additionalrefrigerant in liquid state through the stop valve service port.Check if gas and liquid stop valves are closed.If the total amount can not be charged, follow the additionalrefrigerant charge procedure (B) shown below.Heat pump system (2-pipe)Heat recovery system (3-pipe)1 Pressure reducing valve2 Nitrogen3 Charge hose4 Refrigerant R410A tank (siphon system)5 Measuring instrument6 Vacuum pump7 Outdoor unit8 Gas line stop valve9 Liquid line stop valve (in case of heat pump system): HP/LP10 HP/LP gas line stop valve11 Suction gas line stop valve (in case of heat recoverysystem)12 Stop valve service port (in case of heat recovery system)13 To indoor unit14 To indoor unit/BS unit15 Field pipingA Valve AB Valve BC Valve CD Valve DB. Additional refrigerant charge procedure by additionalrefrigerant charge operationRefer to page 35 for more information about the system settings foradditional refrigerant charge operation.1 Turn on the power supply of the system (indoor and outdoorunit(s)).2 Make sure the pump is operational and water circulation ispossible.3 Open the valves in accordance with the below table.22.2 0.37 22 0.35Charge the liquidrefrigerant with thecylinder in uprightposition.Charge the liquidrefrigerant with thecylinder in upside-downposition.NOTICECharging with an unsuitable substance may causeexplosions and accidents, so always make sure that theappropriate refrigerant (R410A) is charged. Refrigerantcontainers must be opened slowly.CAUTION When charging a system, charging over thepermissible quantity can cause liquid hammer. Always use protective gloves and protect your eyeswhen charging refrigerant. When the refrigerant charging procedure is done orwhen pausing, close the valve of the refrigerant tankimmediately. If the tank is left with the valve open, theamount of refrigerant which is properly charged mayget off point. More refrigerant may be charged by anyremaining pressure after the unit has stopped.NOTICE If the power of some units is turned off, the chargingprocedure cannot be finished properly. In case of a multi outdoor unit system, turn on thepower of all outdoor units. Make sure to turn ON the power 6 hours beforestarting the operation. This is necessary to warm thecrankcase by the electric heater. If operation is performed within 12 minutes after theindoor and outdoor units are turned on, thecompressor will not operate before thecommunication is established in a correct waybetween outdoor unit(s) and indoor units. Before starting charging procedures, check if the LEDindication on the outdoor unit A1P PCB is as normal(see "15.2. Operating the push buttons and DIPswitches on the logic board" on page 29). If amalfunction code is present, see "18.2. Malfunctioncode list" on page 41. Make sure all connected indoor units are recognised(see "17.2. Monitoring function and field settings" onpage 33).Inch piping size(Ø) (mm) Weight factorMetric pipingsize (Ø) (mm) Weight factor NOTICEIn case of maintenance and the system (outdoor unit+fieldpiping+indoor units) does not contain any refrigerant anymore (e.g., after refrigerant reclaim operation), the unit hasto be charged with its original amount of refrigerant (referto the nameplate on the unit) by pre-charging before theautomatic charging function can be started.Which valves? State of valvesState of valves A, B, C and D andstop valvesValve A OpenValve B ClosedValve C OpenValve D Closed1 8245R410A6 137 791215ABC31245R410A1067 7149111215ABCD