22-2! PRECAUTIONS REGARDING TEST RUNCheck Before Test RunContent checkPower supply cableIndoor/outdoor connection wireEarth wire" Is the wire set up and connected as described in the instructions? Check for any phasesequence." Are the wire connection’s screws loose?" Is the open and close device / leakage breaker installed?" Is the power supply cable’s thickness and length appropriately measured as described inthe instructions?" Is it earthed (grounded)?" Check that the insulation resistant value is more than 1 Mȍ.Use the 500 V mega-testers to measure the insulation.Do not use the mega-tester for any other circuit except for voltage of 220 V to 240 V." Are the wire connections for the indoor/outdoor units connected as described in theinstructions? Are there any looped wires?Refrigerant pipe " Is the piping installed as described in the instructions?" Are the pipes sizes appropriate?" Does the pipe’s length adhere to the specifications?" Is the branch pipe slant being appropriately done as described in the instructions?" Was vacuum removal sufficiently carried out?" Was the leak tightness test carried out with nitrogen gas? Use the testing pressure of3.8 MPa." Is the piping insulation material appropriately installed? (Insulation material is necessary forboth gas and liquid piping.)" Is the 3-way valve for the liquid side and gas side open?" Always be sure to use a properly insulated tool to operate the short-circuit pin on the circuit board. (Do not use your finger.)" Never switch the power supply ON until the installation has completed." Supply electrical current through all indoor units and check the voltage." Supply electrical current through all the outdoor units and check each inter-phase voltage." Before the test run, ensure to check that the 3-way valve is open. Operating while the valve is closed causes the compressor tofail.Test Run Procedure" If there are duplicated system addresses, or if the settings for the Nos. of the indoor units are not consistent, an alarm will occurand the system will not start." Switch on both indoor and outdoor unit." Short-circuit CHK pin on the outdoor main PCB.Do not remove CHK pin until test run is completed.Removing CHK pin stops test run." Short-circuit RUN pin on the outdoor main PCB for one second or longer.Factory setting is cooling operation mode and cooling operation test run starts.If heating operation starts, short-circuit both right side and centre of the MODE pin (centre and COOL) for one second or longer." Ensure to conduct a test run. In addition, be sure to run the cooling operation test run for at least 20 minutes before starting theheating operation test run." To conduct heating operation test run, short-circuit left side and centre of the MODE pin (centre and HEAT) for one second orlonger." Removing CHK pin’s short-circuit stops test run." For the test run using remote controller please see Installation Instructions included with the remote controller.