Hitachi RPK-0.8FSNH2M - Drain Piping; Drain Pipe Connection

DRAIN PIPING
4
9
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 (*1).
HP
A
B
C
(0.8-1.5)
45
560
115
2.0
45
550
150
(2.5-4.0)
42
550
150
(*1) RPK-(1.0-1.5)FSNH2M, (models to mount the
expansion valve outside units) may generate refrigerant
circulation noise; take out the pipe from the right rear side
whenever possible, instead of the left 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.
Incorrect: Upward Slope
Incorrect: Rising Part
INCORRECT
Common Drain Piping
1/25~1/100 Down Slope
Drain Piping connection
CORRECT
Contour of the Unit
C
Ø 65 Hole for
Rear Side
Connection
for Wiring
and Piping
B
Drain Piping Connection
for Viny
l Pipe (C)
A
Change Drain piping connection
Drain Outlet
Cap
Drain
Hose
Drain Outlet
Cap
Insert until
this line
Drain Hose
Insert until
this line