Panasonic S-22KA1E5S Service Manual page 122

11.7.5 INDOOR UNIT DRAIN PIPING
•
Drain piping must have down-slope (1/50 to
1/100); be sure not to provide up-and-down slope
to prevent reversal flow.
•
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).
•
The height of drain may be possible up to 750 mm.
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.
11.7.6 HEAT INSULATION
Be sure to perform heat insulation on the drain, liquid and gas piping. Imperfection in heat insulation work leads to water
Caution
leakage.
1. Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance (over 120°C).
Band
(Accessory)
Indoor
unit
Down-slope (1/50 ~ 1/100)
Elbow
Elbow
Overlap with heat
insulator for piping.
Heat insulator
for piping
(Local supply)
Heat insulator
(Accessory)
Indoor
unit
Pipe clamp
Down-slope
•
When drain set piping, install as shown in the
figure below.
Feed water
Drain up motor
Hose clip (Accessory)
Heat insulator (Local
supply) (The thickness
must be at least 8 mm.)
It may be required to take off this part for checking
or servicing the drain up motor. Please do not glue.
Make sure that there is no clearance here.
122
Upward routing
Trap
Drain hose
Main drain
pipe
Drain
port
Glue the joint
Drain hose connection
Use the clip (accessory)
Flexible hose with
heat insulator
(Accessory)
PVC pipe
(O.D. ø25)
(Local supply)
To be glued