Hitachi RPI-1.5FSRE, Installation & Operation Manual, Page: 47 / 450

RPI-(2.5 ~ 6.0)FSRE
PIPING CONECTION Dimension (mm)
Gas pipe
a1 b1 c1
99 122 64
Liquid pipe
a2 b2 c2
143 162 65
Drain pipe
a3 b3 c3
216 171 66
5.2 PIPE SIZE SELECTION
Models
Pipe Size (mm)
Gas Piping Liquid Piping Drain Piping
RPI-1.5FSRE Ø12.7 (1/2) Ø6.35 (1/4) Ø32 (Outer) VP25
RPI-2.0FSRE Ø12.7 (1/2) Ø6.35 (1/4) Ø32 (Outer) VP25
RPI-(2.5~6.0)FSRE Ø15.88 (5/8) Ø9.52 (3/8) Ø32 (Outer) VP25
6 DRAIN PIPING
6.1 GENERAL INFORMATION
!
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.
- INCORRECT
Incorrect: rising part
Incorrect: upward slope
• 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.
- CORRECT
Š
Pump system
Common drain piping (VP30)
(Down slope from rising part)
Vinyl chloride pipe (VP25)
Min. 100mm
(higher as possible)
Drain piping of unit side
This drain piping
shall be separating
from others pipes
1/25 to 1/100
Down-Slope
• 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.
?
N O T E
• Install drainage in accordance with national and local codes.
• Pay attention to the thickness of the insulation when insulation is
performed. If it is too thick, piping can not be installed in the unit.
• If there is excessive clearance between the drain pipe connection and
the drain hose, add a sealing material between both parts in order to
fit and not deform the drain hose.
After performing drain piping work and electrical wiring, check to
ensure that water flows as in the following procedure:
RPI Checking with the standard Drainage (drain pump)
• Switch ON the power supply.
• Full the drain pan with approximately 1.2 liters of water. Then
float switch stops the system automatically. In this operation
the drain pump do not stops.
• Switch OFF the power supply after.
DRAIN PIPING
PMML0528 rev.1 - 02/2021 17
EN