LG AM07BP NSJ, Engineering Product Data Book

Page: 193 / 246

MULTI/SINGLE
Indoor unit
7. Installation
28
Ceiling concealed duct - Middle static pressure
7.4.2 Drain pipe connection without 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 and drain piping fittings should be referenced
from ‘Specifications’ of each models.
– Piping material: Use the Polyvinyl chloride pipe.
• Be sure to install heat insulation on the drain piping.
– Heat insulation material: Polyethylene foam with thickness more than 8 mm (5/16 inch).
U-trap is not required for low static model in which the
external static pressure is below 50 pa(5mm Aq)
Pipe clamp
Maintenance
drain port
Indoor unit
Upward
routing
not allowed
Unit
Drainage pipe
(Local supply)
Thermal insulator
(Local supply)
Make sure to be closed.
Drainage conduit