5 DRAIN PIPING
5.1 GENERAL
! CAUTION
• Do not create an upper-slope or rise for the drain piping, since drain
water will ow back to the unit and leakage to the room will occur
when the unit operation is stopped.
Incorrect: Upward Slope
Incorrect: Rising Part
INCORRECT
• Do not connect the drain pipe with sanitary or sewage piping or any
other drainage piping.
• When the common drain piping is connected with other indoor units,
the connected position of each indoor unit must be higher than the
common piping. The pipe size of the common drain pipe must be
large enough according to the unit size and number of unit.
Common Drain Piping
1/25~1/100 Down Slope Drain Piping connection
CORRECT
• Drain piping will require insulating if the drain is installed in a location
where condensation forming on the outside of drain pipe may drop
and cause damage. The insulation for the drain pipe must be selected
to insure vapor sealing and prevent condensation forming.
• Drain trap should be installed next to indoor unit. This trap must be
designed to good practice and be checked with water (charged) and
tested for correct ow. Do not tie or clamp the drain pipe and refriger-
ant pipe together.
? NOTE
Install drainage in accordance with national and local codes.
After performing drain piping work and electrical wiring, check to
ensure that water ows smoothly as in the following procedure:
Checking Unit without Drain-up Mechanism
• Pour approximately 1.8 liters of water into the drain pan.
• Check to ensure that the water ows smoothly or whether no
water leakage occurs. When water cannot be found at the
end of the drain piping, pour another approximately 1.8 liters
of water into the drain pan.
? NOTE
Pay attention to the thickness of the insulation when the left side piping is
performed. If it is too thick, piping can not be installed in the unit.
5.2 DRAIN PIPE CONNECTION
The standard direction of drain piping connection is right side as
viewed from the discharge grilles. However, it can be performed
from the left side connection is required due to the building
construction.
For Right Side Connection
1 Insert the hose into the wire clamp.
2 Push the drain hose onto the drain boss until the hose
reaches the end of the drain pan.
3 Tighten the screw for the wire clamp in order to hold the
hose around the drain connection without any leakage of
drain water as shown bellow.
4 Insulate the drain hose around the wire clamp to prevent any
condensation as shown.
Wire Clamp B
Drain Hose
Wire Clamp A
Insulation
Drain Pipe
Drain Boss
For Left Side Connection
Fan Runner
Fan Motor
Rear Side
Fastener Band
Drain Plug
Insulation Plug
Drain Plug
Drain Boss
Remove the drain plug of the left-side drain boss as indicated in
the following procedure.
1 Cut the fastener.
2 Remove the insulation material.
3 Remove the drain plug.
DRAIN PIPING
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