Daikin VRV IV Q+ Series Installer And User Reference Manual

Also see for RXYQQ10U7Y1B: Installation and operation manual

19 | Electrical installationInstaller and user reference guide109RXYQQ8~20U7Y1BVRV IV Q+ series heat pump4P546229-1A – 2020.10NOTICE▪ Be sure to keep the power line and transmission line apart from each other.Transmission wiring and power supply wiring may cross, but may not run parallel.▪ Transmission wiring and power supply wiring may not touch internal piping(except the inverter PCB cooling pipe) in order to avoid wire damage due to hightemperature piping.▪ Firmly close the lid and arrange the electrical wires so as to prevent the lid orother parts from coming loose.The transmission wiring outside the unit should be wrapped and routed togetherwith the field piping.Field piping can be routed from front or bottom of the unit (going left or right).Refer to "To route the refrigerant piping" [482].▪ Be sure to follow the limits below. If the unit-to-unit cables are beyond theselimits, it may result in malfunction of transmission:- Maximum wiring length: 1000 m.- Total wiring length: 2000 m.- Maximum inter unit wiring length between outdoor units: 30 m.- Transmission wiring to cool/heat selector: 500 m.- Maximum number of branches: 16.▪ Maximum number of independent interconnectable systems: 10.▪ Up to 16 branches are possible for unit-to-unit cabling. No branching is allowedafter branching (see figure below).a a aA Bbbbbbbhefggdca Outdoor unitb Indoor unitc Main lined Branch line 1e Branch line 2f Branch line 3g No branch is allowed after branchh Central user interface (etc...)A Outdoor/indoor transmission wiringB Master/slave transmission wiringFor the above wiring, always use vinyl cords with 0.75 to 1.25 mm2 sheath or cables(2-core wires). (3-core wire cables are allowable for the cooler/heater changeoveruser interface only.)