Refrigerant And Drain Piping - Hitachi RPI-16.0FSN3PE Installation And Operation Manual

4 Refrigerant and drain piping

4 REFRIGERANT AND DRAIN PIPING
4.1 GENERAL
INCORRECT
CORRECT
X
Y(*)
N O T E
• (*)Y distance must be higher than X.
• 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 (in each unit).
- 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 of each unit.
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.
4.2 REFRIGERANT PIPING AND DRAINING CONNECTION
The location of Liquid, Gas and the Drain Pipe connection is shown below.
Liquid Pipe
Gas Pipe
Wiring
holes
Liquid Pipe
Gas Pipe
6
Incorrect:
Upward
Slope
Incorrect:
Drain Piping
Rising Part
connection
1/25~1/100
Down Slope
Drain
trap
Common Drain Piping
Drain
Pipe
PMML0323A rev.2 - 06/2014
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 indoor
units, the connected position of each indoor unit must be high-
er than the common piping. The pipe size of the common drain
pipe must be large enough according to the unit size and num-
ber 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 con-
densation 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.
(mm)
Model RPI-16.0FSN3PE
Gas Piping Ø19.05 (3/4")
Liquid Piping Ø9.53 (3/8")
mm (in)
RPI-20.0FSN3PE
Ø22.2 (7/8")
Ø9.53 (3/8")