Panasonic CU-3KE19NBU Technical & Service Manual

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Contents

26Regulations on wire size differ from locality to locality. Forfield wiring requirements, please refer to your local electri-cal codes. Make sure that the installation fully complieswith all local and national regulations.(1) Remove access panel “C”. (Fig. 32)(2) Connect the inter-unit and power supply line accord-ing to the drawing on the panel side.(3) Be sure to size each wire allowing approx. 4"(10 cm) longer than the required length for wiring.Store excess wiring inside the cabinet.(4) When connections are completed, check that all con-nections are correct as shown in the wiring systemdiagram on panel side.(5) Be sure to ground the unit according to your localcodes.Fig. 32Lock nutConduitplatePlugInter unit(Conduit)Power supply(Conduit)CabinetTerminalblockAccess panel “C”Fig. 33Conduit plateMake sure there is no gap betweenaccess panel “C” and the conduit plate.Access panel CCAUTION6. Test RunPerforming a test run Refer to the test run procedures in the indoor unitinstallation manual. Perform the test run separately for each connectedindoor unit. If 2 units are operated simultaneously, it isnot possible to correctly check for errors in tubing andwiring. If the room temperature is 59°F (15°C) or below, it maynot be possible to check for tubing errors with coolingoperation. If this occurs, perform heating operation foreach unit individually, and check that warm air isdischarged from each unit. If there is cold air mixed inwith the warm air, check the tubing connections again.Checking tubing and wiringPerform the test run and check that operation is normal. Ifthere is an error in tubing or wiring, the refrigerant mayflow to indoor unit B when indoor unit A is operated (forexample). Stop operation immediately if there is an error in tubingor wiring. Turn the power (breaker) to OFF, and checkwhether the inter-unit cables are connected incorrectly,or whether the narrow tubes A and B are connected inreverse. Correct the connections. If there is an error in tubing, pump-down must be per-formed. Be sure to perform pump-down. After makingcorrections, again purge the air from the tubes.CAUTION

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