Drain Piping; Drain Pipe Connection - Hitachi RPK Serie Manuel D'installation

4

DRAIN PIPING

6
Thickness of Copper Pipes
Nominal Outer
Diameters Diameters
1/4 6.35
3/8 9.53
1/2 12.70
5/8 15.88
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.
Incorrect: Upward Slope
Incorrect: Rising Part
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.
1/25~1/100 Down Slope
CORRECT
Common Drain Piping
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.

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.
Drain Piping Connection
for Vinyl Pipe (C)
B
HP
0.8 ~2.0
2.5~
(mm)
R407C R410A
0.80 0.80
0.80 0.80
0.80 0.80
1.00 1.00
INCORRECT
Drain Piping connection
Contour of the Unit
Ø 65 Hole for
123
Rear Side
Connection
for Wiring
and Piping
A B C
45 550 VP16
65 800 VP20
Flare Nut Dimensions
Nominal
Diameters
1/4
3/8
1/2
5/8
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.
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.
Change Drain piping connection
(mm)
B
Outer
Diameters
R407C R410A
6.35 17 17
9.53 22 22
12.70 24 26
15.88 27/29 29