4
4
DRAIN PIPING
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 with Drain-Up Mechanism and Float
Switch
- Switch ON the power supply.
- Pour approximately 1.8 liters of water into the drain pan,
then float switch up and drain pump start working
automatically.
- 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.
- Switch OFF the power supply after.
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 position of the drain pipe connection is shown
below.
2. Prepare a polyvinyl chloride pipe with a 32mm outer
diameter.
3. Fasten the tubing to the drain hose with an adhesive
and the factory-supplied clamp. The drain piping must
be performed with a down-slope pitch of 1/25 to 1/100.
4. Do not apply excessive force to the Drain Pipe
connection. It could cause a damage.
5. Do not use a bent or twisted Drain Hose. It will cause
water leakage.
6. Insulate the drain pipe after connecting the drain hose.
Do not use adhesive between the Drain Pipe
Connection and the
IIncorrect: Upward Slope
Incorrect: Rising Part
INCORRECT
Common Drain Piping
1/25~1/100 Down Slope
Drain Piping connection
CORRECT
Max.
850 mm
Drain Piping Connection
1/25~1/100
Down Slope
(Gradient of Drain piping)
Drain Pipe
Connection
Hose Band
(Accessory)
Do not use adhesive
Vinyl Chloride VP25
(Field Supplied
Use Vinyl Chloride type
adhesive
Drain Hose
(Accessory)
Hose Band (Accessory)
Insulation (Field supplied)
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