Haier AU182AFMFA [11/14] Installation procedure

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Installation Procedure Refrigerant piping 6 Piping and indoor unit vacuumizing Use vacuum pump to perform vacuumizing It is strictly forbidden to use the refrigerant to remove the air inside the system After air tightness test and discharging all the nitrogen connect the vacuum pump Liquid side It shall use the vacuum pump of lower than 755mmHg high vacuum degree and large air discharging over 401 min The vacuumizing time depends on the length of the connecting pipe generally is 1 2 hours When vacuumizing it shall be confirmed both gas and liquid side valves are closed If after 2 hours vacuumizing it cannot reach the vacuum degree below 755mmHg it can be vacuumized for other 1 hour If after 3 hours vacuumizing it still cannot reach the vacuum degree below 755mmHg check if there is any leaking point and repair the them If after over 2 hours vacuumizing the vacuum degree is below 755mmHg close the VL and VH on the meter separator and stop vacuumizing 1 hour later to confirm if the vacuum degree changes If changes it indicates there is leaking point in the system Check the leaking point and repair After finishing the above vacuumizing change the vacuum pump into refrigerant pump to charge the refrigerant 7 Charging amount of refrigerant When the total length L of the two indoor units connecting pipe is less than 5m it is unnecessary to charge additional refrigerant If the connecting pipe L exceeds 5m it shall charge Mg additional refrigerant per meter That is Refrigerant charging amount L 5 x M g For Series 18 M 30 For Series 28 M 65 Only in COOLING operation can charge the additional refrigerant When charging the refrigerant shall be charged from the charging nozzle of low pressure vavle Be carefull when charging refrigerant do not let the air mix into the system and must charge the additional refrigerant in liquid condition 10

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