General Condensate Piping - LG MULTI V ARNU073TUD4 Installation Manual

Ceiling cassette indoor unit

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Table Of Contents

Table of Contents

General Cassette Indoor Unit Condensate Piping

All ceiling cassette indoor units have a factory-mounted condensate

pump that runs continuously while the unit is in cooling mode. The

pump has an internal high-level float switch that stops the unit if the

water level in the pan rises too high.

All ceiling cassette units have a flexible drain hose kit and one or

two clamps. The hose can be used to connect the condensate pipe

to the condensate pump connection.

Condensate Pump Connection

Note the following when connecting the condensate pipe to the unit.

• Indoor units

DO NOT come with check valves or a backflow

prevention device. If check valves are needed, they must be field

supplied.

• The maximum lift of all condensate pumps is 27-9/16 inches (700

mm).

• Measure lift distance from the bottom surface of the indoor unit,

NOT from the condensate pipe connection.

Cassette Unit Drain Information

When the bottom surface of the indoor unit is at an elevation below

the receiving building drain line connection, install an inverted trap at

the top of the condensate pump discharge riser before connection to

the building drain pipe.

When the receiving drain line is mounted horizontally, connect the

inverted trap to the top half of the pipe. The connection point of the

inverted trap to the building drain pipe must always be to the top half

of the pipe and must

never be over 45° either side of the upper

most point of the horizontal building drain line.

If connecting to a vertical drain line or plumbing system vent line,

connect the IDU condensate pump discharge line using a Y-45 fitting

with the double end of the Y-45 fitting facing up. When connecting

to a vertical drain line include an inverted trap at the top of the IDU

condensate pump discharge riser before connection to the Y-45

fitting.

No Gravity Condensate Pipe Connection

Ceiling cassette indoor units do not have a gravity condensate pipe connection. There is a service drain plug on the bottom of each unit

under the decorative panel. This drain plug is intended as a service feature and is not to be used as a permanent gravity drain connection.