• VRV ® Systems • Installation procedure 33• Installation procedure1 Installation of outdoor1 - 10 Test run1 - 10 - 3 Check operation Electrical box Cover of electrical box Cover for servicing Service window Points to be noted when providing services• If operated within about 12 minutes after power supply has been applied to the indoor unit and outside unit, H2P will turn ON but the compressordoes not start running. Before start operation, make sure that the LED display is correct referring to the table (6) of “11-3 Check operation”.• The system may require up to 10 minutes until it can start the compressor after an operation start. This is a normal operation to equalize therefrigerant distribution.• The check operation does not provide any means of checking the indoor units individually. For that purpose, perform normal operation using theremote controller after the check operation.• Check operation is not possible in other modes such as collection mode.• If the setting of indoor remote controller is changed before the check operation, it may not be performed correctly and malfunction code “UF” maybe displayed.Remote controller displays malfunction codeMalfunction code Installation error Remedial actionE3E4F3F6UFU2The shutoff valve of an outside unit is left closed. Open the shutoff valve.U1 The phases of the power to the outside units are reversed. Exchange two of the three phases (L1, L2, L3) to make a positive phaseconnection.U1U2U4No power is supplied to an outdoor or indoor unit (including phaseinterruption).Check if the power wiring for the outside units are connected correctly.(If the power wire is not connected to L2 phase, no malfunction display willappear and the compressor will not work.)UF Incorrect transmission between units Check if the refrigerant piping line and the unit transmission wiring areconsistent with each other.E3F6UFU2Refrigerant overcharge Recalculate the required amount of refrigerant from the piping length andcorrect the refrigerant charge level by recovering any excessive refrigerantwith a refrigerant recovery machine.E4F3Insufficient refrigerant • Check if the additional refrigerant charge has been finished correctly.• Recalculate the required amount of refrigerant from the piping length andadd an adequate amount of refrigerant.U7UFIf an outdoor multi terminal is connected when there is one outside unitinstalledRemove the line from the outdoor multi terminals (Q1 and Q2).UFE4The operation mode on the remote controller was changed before the checkoperation.Set the operation mode on all indoor unit remote controllers to “cooling.”HJ The heat source water is not circulating. Make sure that the water pump is running.
