Panasonic S-36PU1E5A Service Manual page 405

6-5. Indoor Unit Drain Piping
During drain piping connection, be careful not to exert extra force on the drain port at the indoor unit.
The outside diameter of the drain connection at the indoor unit is 32 mm.
Piping material: Polyvinyl chloride pipe VP-25 and pipe fittings.
Be sure to perform heat insulation on the drain piping.
Heat insulation material: Polyethylene foam with thickness more than 8 mm (local supply).
Drain piping must have down-slope (1/50 to 1/100); be sure not to provide up-and-down slope to prevent reversal flow.
Be sure to check no air trap on drain hose and to ensure smooth water flow and no abnormal sound.
The height of drain may be possible up to 750 mm.
When drain set piping, install as shown in the figure below.
Indoor
unit
Pipe clamp
Down-slope
Drain port
Indoor unit
Drain Test
The air conditioner uses a drain up motor to drain water.
Use the following procedure to test the drain up motor operation.
Connect the main drain pipe to exterior and leave it
provisionally until the test comes to an end.
Feed water to the flexible drain hose and check the piping for
leakage.
Be sure to check the drain up motor for normal operating and
noise when electric wiring is complete.
When the test is complete, connect the flexible drain hose to
the drain port.
Upward routing
Trap
Fig. 1-129
Down-slope (1/50 ~ 1/100)
Elbow
Elbow
Fig. 1-131
Down-slope
Air Trap
Apply the head when connecting with
the confluence pipe. (about 100 mm)
Indoor
unit
Down-slope (1/50 ~ 1/100)
Feed water
Drain up motor
1-395
Upward-slope
No Air Trap
Fig. 1-130
Use VP30 or more for confluence
Fig. 1-132
Drain hose
Main drain pipe
Drain
Glue the joint
port
Drain hose connection
Use the clip (accessory)
Fig. 1-133
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