Common Drainage System - LG ARND DCR4 Series Installation Manual

INSTALLATION

Common Drainage System

Common Drainage System
It is usual work practice to connect individual Split
Compact DOAS drain pipes to one common drainage
system.
The diameter of the common vertical drain pipe
must be as large as necessary. The diameter of the
horizontal pipe must be the same or larger than the
vertical drain pipe. To avoid property damage in the
event of the primary drain becoming clogged, and to
optimize drain system performance, it may be prudent
to install a secondary drain line.
Design the drain system to plan for winter opera-
tion (condensate line may freeze up if condensate
does not properly drain away). Drain all generated
condensate from the external condensate pan to an
appropriate area. Install a trap in the condensate lines
as near to the indoor unit coil as possible. To prevent
overflow, the outlet of each trap must be positioned
below its connection to the condensate pan. All traps
must be primed, insulated, and leak tested.
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Figure 6: Example of a Common Drainage System.
45° to 60° Angle
45° to 60° Angle
• It is recommended that a dedicated drain pipe be installed for the air conditioning
system. If the drainage system is shared with a rainwater drain, waste water, or
any other type of building drain system, back flow, leaks, ice may form, or noxious
odors may infiltrate the air conditioning system.
• Install a trap if the drain access to the outside faces an undesirable location (i.e.,
sewer), otherwise, noxious odors may infiltrate the air conditioning system.
Due to our policy of continuous product innovation, some specifications may change without notification.
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45° to 60° angle for protection against overflow
45° to 60° Angle
Common horizontal drain pipe
Position the vent
down to prevent
debris from entering
the system
27-1/2 in.
(Maximum pump
Common
lift distance
vertical
[depends on indoor
drain pipe
unit type]).
Include trap
at the end.