15 English(Check a malfunction code in the remote controller connected to theindoor unit.)• There might be a problem with the connection or transmissionbetween the indoor unit and the remote controller.Check connections, and check for wire breakage.CAUTION• After finishing the test run and before using the unit by cus-tomer, confirm that the front panel and screws are attachedsecurely to the unit.10. CAUTION FOR REFRIGERANT LEAKSDANGER• Refrigerant gas is heavier than air and replaces oxygen. A massiveleak could lead to oxygen depletion, especially in basements, and anasphyxiation hazard could occur leading to serious injury or death.(Points to note in connection with refrigerant leaks)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 Split 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 condi-tioning facilities are installed in a room which 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 maximumconcentration of refrigerant is directly related to the humanly occupiedspace in to which it could leak.The unit of measurement of the concentration is lb./ft 3( the weight in lb.of the refrigerant gas in 1ft 3volume of the occupied space).Compliance to the local applicable regulations and standards for themaximum allowable concentration level is required.Pay a special attention to the place, such as a basement, etc.where refrigerant can stay, since refrigerant is heavier than air.Procedure for checking maximum concentrationCheck the maximum concentration level in accordance with steps 1 to 4below and take whatever action is necessary to comply.1. Calculate the amount of refrigerant (lb.) charged to each systemseparately.When a malfunction code is displayed in the remote controllerMalfunctioncode Cause SolutionE3The stop valvesin the outdoorunit remainclosed.Open the stop valve on both thegas and liquid lines.The refrigerant isovercharged.Calculate again the requiredamount of refrigerant to becharged based on the pipinglength, recover the refrigerantusing the refrigerant recoverydevice, then achieve properamount of refrigerant.E4F3The stop valvesin the outdoorunit remainclosed.Open the stop valve on both thegas side and liquid side.The operation modeon the remote control-ler was changedbefore the checkoperation.Set the operation mode on allindoor unit remote controllers to“cooling.”The refrigerant isinsufficient.• Check whether additionalrefrigerant charge has beenfinished correctly.• Calculate again the requiredamount of refrigerant to becharged based on the pipinglength, then charge additionallyproper amount of refrigerant.F6 The refrigerant isovercharged.Calculate again the requiredamount of refrigerant to becharged based on the pipinglength, recover the refrigerantusing the refrigerant recoverydevice, then achieve properamount of refrigerant.U3The checkoperation has notperformed.Perform the check operation.U4The power is notsupplied to theoutdoor unit.Connect correctly the power sup-ply wiring of the outdoor unit.UAImproper type ofindoor unit isconnected.Check the type of indoor unitcurrently connected. If it is notproper, replace it with properone.UFThe stop valvesin the outdoorunit remainclosed.Open the stop valve on both thegas and liquid lines.The piping andwiring of theindoor unit arenot connectedcorrectly to theoutdoor unit.Confirm that the piping andwiring of the indoor unit are con-nected correctly to the outdoorunit.The operation modeon the remote control-ler was changedbefore the checkoperation.Set the operation mode onindoor unit remote controller to“cooling.”UHThe transmissionwiring is notconnectedcorrectly.Connect correctly the transmis-sion wiring to the F1 and F2(TO IN/D UNIT) terminals onthe PC board (A1P) in theoutdoor unit.When nothing is displayed in the remote controlleramount of refriger-ant in the unit(amount of refrig-erant with whichthe system ischarged beforeleaving the factory)+ additional chargingamount (amount ofrefrigerant addedlocally in accordancewith the length ordiameter of the refrig-erant piping)= total amountof refriger-ant (lb.) inthe systemDirection of the refrigerant flowRoom whererefrigerant leakhas occurred(outflow of all therefrigerant fromthe system)
