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23
UNIT PIPING
Condensate Drain Connection
WARNING
All condensate drain connections must be properly trapped
and primed before operating the unit. Failure to properly trap a
drain will result in flooding the drain pan and potential water
damage to the unit or building
.
Slope the piping from the trap downward in direction of
flow. The trap must be primed before startup by filling
the “U” portion of the trap with water. Drains that are not
properly trapped and primed will not operate correctly.
Each drain connection must be individually trapped.
Figure 7 shows the layout of the condensate drain
connection. The distance from the drain pan outlet to the
horizontal run of the P-trap should be a distance of twice
the static pressure in the drain pan
If local and area codes permit, the condensate may be
drained back onto the roof, but a drip pad should be
provided beneath the outlet. If local and area codes
require a permanent drain line, it should be fabricated and
installed in accordance with Best Practices and all codes.
In some climates, it will be necessary to provide freeze
protection for the P trap and drain line. The P trap should
be kept filled with water or glycol solution at all times and
it should be protected from freezing to protect the P trap
from damage. If severe weather conditions occur, it may
be necessary to fabricate a P trap and drain line of metal
and install a heat tape to prevent freezing
Figure 7: Trap Specification
Figure 8: Drain size and locations
Refrigerant Piping Installation
This product is designed to work with refrigerant R410A.
Always follow these instructions to perform installation
procedures.
•
Be sure to use the specified refrigerant during
refrigerant circulation and prevent air from
contaminating the refrigerant
•
If the refrigerant leaks during the installation process,
make sure to ventilate any enclosed space
•
Pipes should be purchased separately for installation
of the product
General Information
WARNING
The refrigerant R410A requires strict cautions for keeping the
system clean, dry and tight. Clean and dry: foreign materials
(including mineral oils or moisture) should be prevented from
getting mixed into the system.
•
Tight: R410A does not contain any chlorine, does not
destroy the ozone layer, and does not reduce earth’s
protection against harmful ultraviolet radiation. R410A can
contribute slightly to the greenhouse effect if it is released.
Therefore we should take special attention to check the
tightness of the installation.
•
Combining Multi V DOAS units and Multi V indoor units on
the same system is prohibited.
Selection of Field-Supplied Piping
Material
WARNING
Always follow local codes when selecting and installing copper
pipe and piping system components. Approved piping for use
with Multi V products will be marked “R410 RATED” along the
length of the pipe. Piping wall thickness must meet local code
requirements and be approved for a maximum operating
pressure of 551 psi. When bending piping, try to keep the
number of bends to a minimum, and use the largest radii
possible to reduce the equivalent length of installed piping;
also, bending radii greater than ten (10) piping diameters can
minimize pressure drop. Be sure no traps or sags are present.
For DOAS Units
LG
prefers the use of hard drawn copper in pipe segments
connecting a Dedicated Outdoor Air System (DOAS)
product and an outdoor unit
