MULTI/SINGLE
Indoor unit
8. Installation
24
Ceiling Mounted cassette 4-way
8.5 Indoor Unit Drain Piping
8.5.1 Method of Drainage test
Drainage test of indoor unit with drain pump
8.5.2 Drain piping of indoor unit with drain pump
• 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 force on the drain port on the indoor unit.
• The outside diameter of the drain connection on the indoor unit is 32 mm (1-1/4 inch).
– Piping material: Use the Polyvinyl chloride pipe, 25 mm (1 inch) pipe fittings.
• Possible drain head height is upto 700 mm (27-6/19 inch). So the drain head should be installed below 700 mm
(27-6/19 inch).
• Be sure to install heat insulation on the drain piping.
– Heat insulation material: Polyethylene foam with thickness more than 8 mm (5/16 inch).
Use the following procedure to test the drain pump
operation.
1.Connect the main drain pipe to the exterior and leave it
provisionally until the test comes to an end.
2.Feed water to the flexible drain hose and check the piping
for leakage.
3.Be sure to check the drain pump for normal operating and
noise when electrical wiring is complete.
4.When the test is complete, connect the flexible drain hose
to the drain port on the indoor unit.
Feed water
Drain pump
Drain pan
Flexible drain hose
(accessory)
Main
drain pipe
Glue the joint
Drain
port
Drain hose connection
Use the clip (accessory)
※
According to type of indoor unit, external appearance could be different.
Maintenance
drain port
Upward
routing
not allowed
Pipe clamp
Indoor unit
※
According to type of indoor unit, external appearance could be different.
1/50~1/100 slope
Hanger
distance
Hanger bracket
Max 700mm
Flexible drain hose
Insulation
Metal
clamp
Max 300mm
1~15m
※
According to type of indoor unit, external appearance could be different.
Indoor unit
Maximum 700mm
(27-9/16 inch)
Drain Pipe
Drain Pump
1/50~1/100
1/50~1/100
※
According to type of indoor unit, external appearance could be different.
Unit
Drain pipe
(Local supply)
Thermal insulation
(Local supply)
Elbow
Drain pump
