Refrigerant Piping; Drain Piping - Hitachi RPI-0.6FSN4E Installations- Und Betriebshandbuch

REFRIGERANT PIPING

4 REFRIGERANT PIPING
4.1 PIPING CONNECTION
Size of piping connection
Units: mm (inch)
Model RPI(M) Pipe size
Gas Piping Ø 12.7 (1/2)
Liquid Piping Ø 6.35 (1/4)

RPI
Gas piping connection
Liquid piping
connection

5 DRAIN PIPING

5.1 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: 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.
7 PMML0246A rev.4 - 05/2016
(mm)

RPIM
- CORRECT

RPI/RPIM-DU
1/25 to 1/100
Down-Slope
Drain piping of unit side Common drain piping (VP30)
(Down slope from rising part)

RPIM
1/25~1/100 Down slope
Drain trap
Common drain piping
Detail A
Gas
piping
Liquid piping
Liquid piping
Gas piping
Min. 100mm
(higher as possible)
Vinyl chloride pipe (VP25)
This drain piping shall be
separating from others
pipes
Drain piping
connection