Hitachi P-AP160NA1 Installation And Operation Manual page 14

Drain piping
C A u T I O N
• 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 indo-
or 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.
5.2 DrAIN PIPE CONNECTION
1 The position of the drain pipe connection is shown below
(mm)
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.
Hose band (accessory) Elbow or vinyl chloride VP25
(field-supplied)
Tightening torque:
3.0 - 6.5N.m
Vinyl tape
Drain pipe connection
for checking drainage
(transparent)
10
82
Drain hose
(accessory)
20 + 5mm
Max 300mm
Use vinyl chloride
type adhesive
PmmL0223A rev.0 - 05/2012 - P5415035
N O T E
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 1.5 to 2.0 liters of water gradually into
-
the drain pan, then float switch up and drain pump start
working automatically.
- Check to ensure that the water flows smoothly inside the
transparent drain pipe connection whether no water leaka-
ge occurs. When water cannot be found at the end of the
drain piping, pour more water smoothly into the drain pan.
If the water overflows from the drain pan, recheck the dra-
-
in piping.
- Switch Off the power supply after.
N O T E
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 The drain piping must be performed with a down-slope pitch
of 1/25 to 1/100.
Ceiling
Hose band
a (Max. 300mm)
(accessory)
Drain hose (accessory)
5 Do not apply excessive force to the Drain Pipe connection. It
could cause a damage.
6 Do not use a bent or twisted Drain Hose. it will cause water
leakage.
7 insulate the drain pipe after connecting the drain hose.
Insulation (5T x 25 x 500)
(accessory)
Completely wrap up
the transparent area
of the drain pipe end
connection
1 to 1.5m
S u p p o r t
part
c
1/25 to 1/100
Down-slope
(mm)
Insulation (5T x 100 x 200)
(accessory)
Wrap up the drain hose
completely to cover the
hose band.
Hose band (accessory)