Panasonic CS-ME9PB4EA, Service Manual

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11.5 INDOOR UNIT DRAIN PIPING
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During drain piping connection, be careful not to exert extra force on the drain port at the indoor unit.
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The outside diameter of the drain connection at the indoor unit is 32mm.
Piping material: Polyvinyl chloride pipe VP-25 and pipe fittings.
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Be sure to perform heat insulation on the drain piping.
Heat insulation material: Polyethylene foam with thickness more than 8 mm (local supply).
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Drain piping must have down-slope (1/50 to 1/100); be sure not to provide up-and-down slope to prevent reversal
flow.
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Be sure to check no air trap on drain hose and to ensure smooth water flow and no abnormal sound.
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The height of drain may be possible up to 750 mm.
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When drain set piping, install as shown in the
figure below.
Drain Test The air conditioner uses a drain up motor to drain water. Use the following procedure to test the drain up motor operation.
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Connect the main drain pipe to exterior and leave it provisionally until the test comes to an end.
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Feed water to the flexible drain hose and check the piping for leakage.
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Be sure to check the drain up motor for normal operating and noise when electric wiring is complete.
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When the test is complete, connect the flexible drain hose to the drain port.
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Pour about 600-700cc of water in the drain pan of the indoor unit. (Pour from the position specified in the drawing
by using a water supply bottle or other suitable tool.)
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Press the drain pump test run on PCB to start the drain motor, and verity water drainage.
(The drain motor will automatically stop after operating for about five minutes.)