Panasonic R410A Service Manual

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Panasonic R410A Service Manual Manual pdf 34 page image

Mini VRF SYSTEMOutdoor Unit Repair Procedures2 - 12123546(1)(2)(3)(4)(5)(6)This procedure is carried out to ensure there is no remaining refrigerant or other gases (nitrogen, etc.) in therepaired outdoor unit and tubing.5-1. Evacuating Repaired Outdoor UnitCheck that each service valve of the gas line, and the liquid line in the outdoor unit are fully closed.* If the AP pins (CN46) on the outdoor control PCB have already been short-circuited, steps (2) and (5) are notnecessary.Turn off power to the outdoor unit to be evacuated.Connect the manifold gauge valves to the high- and low-pressure sensor outlets of the outdoor unit.Connect the manifold gauge valves to the vacuum pump.Short-circuit the AP pins on the outdoor control PCB and turn on power to the repaired outdoor unit.By short-circuiting the AP pins and turning on power to the outdoor unit, allelectronic expansion valves in the outdoor unit are forcibly opened and anyremaining nitrogen gas can be recovered. Failure to perform this proceduremay result in nitrogen gas remaining in the refrigerant circuit and causingoperating problems. Therefore, never skip this step.To ensure proper evacuation, refer to the operating instructions that camewith the vacuum pump.Run the vacuum pump and continue evacuation until the vacuum condition falls to less than –14.7 psig (5 Torr).5-2. Evacuating Refrigerant Tubing Between Indoor and Outdoor UnitsRefer to the “Installation Instructions” that came with the outdoor unit.CAUTIONCAUTIONManifoldgaugeLow-pressure outlet port(For ø5/16" connector)High-pressure outlet port(For ø5/16" connector)Lo HiVacuum pumpFig. 2-75. Evacuating System