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Outdoor Unit Installation <br /> 5. Pressure test and evacuating system <br /> WARNING <br /> • Do not mix any substance other than the specified refrigerant(R410A)into the refrigeration cycle. <br /> • If refrigerant gas leaks should occur,ventilate the room as soon and as much as possible. <br /> • R410A,as well as other refrigerants, should always be recovered and never be released directly into the environment. <br /> • Use a vacuum pump for R410A exclusively.Using the same vacuum pump for different refrigerants may damage the vacuum <br /> pump or the unit. <br /> CAUTION <br /> It is highly recommended that you do not open/close the stop valves when the outdoor temperature is below-5°F(-21°C)as <br /> this may result in refrigerant leakage. <br /> • When piping work is complete, it is necessary to perform a pressure test Compound Pressure High-pressure <br /> and evacuate system with a vacuum pump. pressure gauge meter valve <br /> • If using additional refrigerant, purge the air from the refrigerant pipes and <br /> indoor unit using a vacuum pump,then charge additional refrigerant. Gauge <br /> • Use a hexagonal wrench(3/16 inch(4mm))to operate the stopvalve rod. manifold�� G <br /> 9 p Liquid <br /> • All refrigerant pipe joints should be tightened with a torque wrench to the /-- - stop <br /> specified tightening torque. Valve caps valve <br /> Low-pressure <br /> valve — L <br /> G- <br /> Charging <br /> hoses v <br /> .\ <br /> u ~ <br /> Vacuum pump Service port <br /> Gas stop valve <br /> 1) Pressurize the liquid pipe and gas pipe from the service ports of each stop valve to 550psi(3.8MPa) (do not pressurize <br /> more than 550psi(3.8MPa))for 1 hour minimum,24 hours recommended.If there is a pressure drop,check for leaks, <br /> make repairs and perform the pressure test again. <br /> 2) Connect the gauge manifold's charging hose to the gas stop valve's service port. <br /> 3) Fully open the gauge manifold's low-pressure valve(Lo)and completely close its high-pressure valve(Hi). <br /> (High-pressure valve will require no further operation.) <br /> 4) Evacuate system using vacuum pump to below 500 microns for 1 hour minimum. <br /> 5) Close the gauge manifold's low-pressure valve(Lo)and stop vacuum pump. <br /> (Maintain this condition for a few minutes to make sure that the compound pressure gauge pointer does not swing <br /> back.)" <br /> 6) Remove the valve caps from the liquid stop valve and gas stop valve. <br /> 7) Turn the liquid stop valve's rod 90°counter-clockwise with a hexagonal wrench to open the valve. <br /> Close it after 5 seconds,and check for gas leakage. <br /> Using soapy water,check for gas leakage from the indoor unit's flare and outdoor unit's flare and valve rods. <br /> After the check is complete,wipe all soapy water off. <br /> 8) Disconnect the charging hose from the gas stop valve's service port,then fully open the liquid and gas stop valves. <br /> (Do not attempt to turn the valve rod further than it can go.) <br /> 9) Tighten the valve caps and service port caps for the liquid and gas stop valves with a torque wrench to the specified <br /> torques. <br /> Refer to"4.Refrigerant piping"on page 6 for details. <br /> *1 If the compound pressure gauge pointer swings back,the refrigerant may have water content or there may be a loose <br /> pipe joint. <br /> Check all pipe joints and retighten nuts as needed,then repeat steps 3)through 5). <br /> 7 ■English <br />