16 drain PiPinG
Perfom the drain piping work after connecting the refrigerant
pipes and attaching insulations.
!
d a n G e r
Do not insert the drain pipe for the indoor unit to the drainage trench
where corrosive gases occur. Poisonous gases flow into the room,
so that may cause the poisoning.
?
n o t e
• Do not create an upper-slope or rise for the drain piping, since drain
water can flow back to the indoor unit and leakage into the room will
occur when the system operation is stopped.
• 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 units.
• After performing drain piping work and electrical wiring, check to
ensure that water flows smoothly as in the following procedure.
1
Connecting direction of drain pipe: the standard direction of
drain piping connection is right side as viewed from front.
However, it can be performed from the left side when it is
required due to building construction.
Left side
right side
(refrigerant pipe
connection)
for left side drain piping
Cord clamp
Drain pan
Insulation
Drain plug
remove the drain plug.
left side
right side
Insert the drain plug into the
drain boss by using a driver.
Driver
Drain plug
Drain boss
Wrap the insulation around the
drain pipe connection.
Drain plug
Silicon sealant
2
Connecting drain hose.
a.
Insert the hose into the hose clamp.
b.
Push the drain hose onto the drain boss until the hose
reaches the end of drain pan. (If the drain hose is not
inserted completely, it causes water leakage.)
c.
Tighten the screw for hose clamp to face the screw part
downward as shown in the figure below to prevent dew
drop.
d.
Wrap the insulation (accessory) around the hose clamp
to cover drain hose, drain pan, hose clamp without gap.
(If there is gap, dew drop may occur.)
DrAIN PIPING
PMML0254A rev.4 - 12/2018
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