Daikin VRV RXYQ72XBYC Series Installation Manual

Also see for VRV RXYQ120XBYC Series: Operation manual

44EnglishRXYQ72-168XBYC* type21+-31 Terminal block for power supply2 Tester3 White connector3 To prevent damaging the printed circuit board, touch a noncoatedmetal part to eliminate static electricity before pulling out or plug-ging in connectors.4 Pull out junction connectors X1A, X2A (X3A, X4A) for the fanmotors in the outdoor unit before starting service operation on theinverter equipment. Be careful not to touch the live parts.(If a fan rotates due to strong wind, it may store electricity in thecapacitor or in the main circuit and cause electric shock.)5 After the service is finished, plug the junction connector back in.Otherwise the malfunction code E7 will be displayed on the userinterface or on the outdoor unit segment display and normal opera-tion will not be performed.For details refer to the wiring diagram labelled on the back of thecontrol box cover.Pay attention to the fan. It is dangerous to inspect the unit while thefan is running. Make sure to turn off the main switch and to remove thefuses from the control circuit located in the outdoor unit.NOTEPlay it safe. For protection of the printed circuit board, touch the con-trol box casing by hand in order to eliminate static electricity from yourbody before performing service.17.3. Service mode operationRefrigerant recovery operation/vacuuming operation is possible byapplying setting [2-21]. Refer to 13.2. Operating the push buttons andDIP switches on the printed circuit board on page 24 for details how toset mode 2.When vacuuming/recovery mode is used, check very carefully whatshould be vacuumed/recovered before starting. See installation manualof the indoor unit for more information about vacuuming and recovery.17.3.1. Vacuuming method1 When the unit is at standstill, set the unit in [2-21]=1.2 When confirmed, the indoor units and outdoor unit expansionvalves will fully open. At that moment the segment display indica-tion= 01 and the user interface of all indoor units indicate “TestOperation” and CENTRALCONTROL and the operation will be prohibited.3 Evacuate the system with a vacuum pump.4 Press BS3 to stop vacuuming mode.17.3.2. Refrigerant recovery operation methodThis should be done by a refrigerant recovery equipment. Follow thesame procedure as for vacuuming method.18. Caution for refrigerant leaks18.1. IntroductionThe installer and system specialist shall secure safety againstleakage according to local regulations or standards. The followingstandards may be applicable if local regulations are not available.The VRV System, like other air conditioning systems, uses R410A asrefrigerant. R410A itself is an entirely safe non-toxic, non-combustiblerefrigerant. Nevertheless care must be taken to ensure that air con-ditioning facilities are installed in a room that is sufficiently large. Thisassures that the maximum concentration level of refrigerant gas is notexceeded, in the unlikely event of major leak in the system and this inaccordance to the local applicable regulations and standards.Maximum concentration levelThe maximum charge of refrigerant and the calculation of the maxi-mum concentration of refrigerant is directly related to the humanlyoccupied space in to which it could leak.The unit of measurement of the concentration is lbs./ft. 3 (kg/m 3) (theweight in lbs. (kg) of the refrigerant gas in 1 ft. 3 (1 m 3 ) volume of theoccupied space).Compliance to the local applicable regulations and standards for themaximum allowable concentration level is required.211 Direction of the refrigerant flow.2 Room where refrigerant leak has occurred (outflow of allthe refrigerant from the system).Pay special attention to places, such as basements etc., whererefrigerant could stay, since refrigerant is heavier than air.

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