Drain Piping - Hitachi P-AP160NA1 Installations- Und Betriebshandbuch

Drain piping

Flare Pipe Dimensions
  
Nominal diameters
1/4
3/8
1/2
5/8
5 DRAIN PIPING
5.1 GENERAL
INCORRECT
Incorrect: Upward slope
Incorrect: Rising part
1/25 to 1/100
Down-slope
Common drain piping (min VP30)
Drain piping of unit side
(Down-slope from rising part)
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.
10
Outer diameters
6.35
9.53
12.70
15.88
CORRECT
Min 100mm
(higher as possible)
Vynil chloride pipe (VP25)
This drain pipe shall
be separating from
other pipes
PMML0280A rev.1 - 09/2014
Flare Nut Dimensions
  
(mm)
A +0/-0.4
9.1
13.2
16.6
19.7
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 1.8 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.
- Switch OFF the power supply.
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.
Nominal diameters Outer diameters
1/4
3/8
1/2
5/8
(mm)
B
6.35 17
9.53 22
12.70 26
15.88 29