Indoor Unit Drain Piping; Drain Test - Panasonic S-22MU1E5A Technical Data Manual

3. How to install the indoor unit

3-2-5. 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 Downward Slant (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.
1
2
The height of drain may be possible up to 750 mm.
Drain port
3
Indoor unit
4

Drain Test

The air conditioner uses a drain up motor to drain water. Use the following procedure to test the drain up motor operation.
5
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
6
and noise when electric wiring is complete.
When the test is complete, connect the flexible drain hose
to the drain port.
7
8
9
Downward Slant (1/50 ~ 1/100)
Elbow
Elbow
Fig. 2-36
Indoor
unit
Pipe clamp
Downward Slant
Downward Slant
Air Trap
When drain set piping, install as shown in the figure below.
Apply the head when connecting with the
confluence pipe. (about 100 mm)
Indoor
unit
Downward Slant (1/50 ~ 1/100)
Feed water
Drain up motor
2-22
Design of VRF SYSTEM
Upward routing
Trap
Fig. 2-34
Upward Slant
No Air Trap
Fig. 2-35
Use VP30 or more for confluence
Fig. 2-37
Drain hose
Main drain pipe
Drain
Glue the joint
port
Drain hose connection
Use the clip (accessory)
Fig. 2-38