4
DRAIN PIPING
5
4.
DRAIN PIPING
4.1.
GENERAL
CAUTION:
-
Do not create an upper-slope or rise for the drain
piping, since drain water will flow back to the unit and
leakage to the room will occur when the unit 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 unit.
-
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 flow. Do not
tie or clamp the drain pipe and refrigerant 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 flows 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 flows 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.
4.2.
DRAIN PIPE CONNECTION
1. The standard direction of drain piping connection is the
right side as viewed from the discharge grilles. However,
it can be performed from the left side or rear side.
2. When the left side drain piping connection is performed,
remove the cap of left side drain pipe, and then attach
this cap to the right side drain pipe in order to change
drain piping connection from right side to left side.
3. Provide a vinyl chloride tube, of a 26mm outer diameter
(C).
4. Connect a drain piping according to figure.
Do not create an upward slope from the unit.
Use vinyl chloride type adhesive for connecting the
drain pipe.
5. Tightly squeeze the drain hose with the wire clamp after
inserting the drain pipe into the drain hose completely.
6. Pour water onto the drain pan and check to ensure that
water flows smoothly.
Incorrect: Upward Slope
Incorrect: Rising Part
INCORRECT
Common Drain Piping
1/25~1/100 Down Slope
Drain Piping connection
CORRECT
Contour of the Unit
Hole for Rear
Side Connection
for Wiring
and Piping
∅
65
Drain Piping Connection
for Vinyl Pipe (VP 16)
Change Drain piping connection
Provide a downward
slope to flow drain
water smoothly
Use adhesive tape
24 m
m
VP20
115
45
800
