Drain Pipe Work - LG ATNC186ELAA Service Manual

Installation

7. Drain Pipe Work

Drain pipe gradient and support
1) - The drain pipe must be fitted at a gradient of at least 1/100.
- The drain pipe should be as short as possible and free from airlocks.
Indoor unit
2) Suspension bolts should be used to support long stretches of drain pipe in order to ensure that a gradient
of 1/100 is maintained.(PVC pipe should not be bent)
Spacing of supports for horizontal piping
Class
Rigid PVC pipe
3) The length of pipe laid horizontally should be kept a minimum.
Drain Piping of Ceiling Cassette
• 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 on the indoor unit.
• The outside diameter of the drain connection on the indoor unit is
32mm.
Piping material: Polyvinyl chloride pipe VP-25
and pipe fittings
• Be sure to install heat insulation on the drain piping.
Heat insulation material: Polyethylene foam with
thickness more than 8 mm.
Install the drain raising pipes at a right angle to the
indoor unit and no more than 300mm from the unit.
Drain test
The air conditioner uses a drain pump to drain water.
Use the following procedure to test the drain pump
operation:
Feed water
Drain Pump
CAUTION
The supplied flexible drain hose should not be curved,
neither screwed. The curved or screwed hose may
cause a leakage of water.
70 Universal System Air Conditioner
Nominal diameter
25~40mm
Flexible drain hose
(accessory)
Drain
port
Glue the joint
Drain hose connection
Use the clip (accessory)
Drain pan
Spacing
1.0m or less
Pipe clamp
Indoor unit
Maintenance
drain port
• Connect the main drain pipe to the 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 pump for normal
Main
drain pipe
operating and noise when electrical wiring is
complete.
• When the test is complete, connect the flexible
drain hose to the drain port on the indoor unit.
Gradient of at least 1 / 100
(1cm/ 1m)
300mm or less
Clamp metal(attached) Drain hose(attached)
Flexible drain hose Flexible drain hose
Flexible drain hose
Flexible drain hose
Upward
routing
not allowed
1 -1.5m
Drain raising pipe
1/50~1/100
MAX 700mm