Piping Connection Size - Hitachi RAI-50PPD Installation And Operation Manual

REFRIGERANT PIPING
9 REFRIGERANT PIPING
Before refrigerant piping work, drain piping work and insulation
are required. Refer to the "10 Drain piping"
!
D A N G E R
• Do not perform refrigerant piping work, drain pumping, and
refrigerant charge without referring to Installation and Operation
Manual of the outdoor unit.
9.1 PIPING POSITION
521
(Liquid pipe)
145
94
(Gas pipe)
Refrigerant liquid pipe
connection
Refrigerant gas pipe
connection

9.2 PIPING CONNECTION SIZE

1 Prepare locally-supplied copper pipes.
2 Select the appropriate pipe size according to the table
below:
Model
RAI-50PPD
RAI-60PPD
3 Select clean copper pipes. Make sure there is no dust and
water inside. Use a pipe cutter when cutting the pipes, to
avoid a grind swarf generation. Do not use a saw or a grind
stone to cut pipes. Blow the inside of the pipes with nitrogen
or dry air, to remove any dust or foreign materials before
connecting pipes.
?
N O T E
• Refer to Installation and Operation Manual of the outdoor unit for
detail on allowable pipe length.
• Notice for refrigerant pipe ends.
• Attach a cap or put a plastic bag over the pipe end.
In Case of Getting the Pipe
Through a Hole in the Wall
In case of getting the pipe through a hole in the wall.
Correct
Correct
Hole
Hole
Attach a cap or put a plastic bag
Cap or plastic bag
over the pipe end.
13 PMML0477 rev.0 - 07/2017
In Case of Rain
for details.
(Drain pipe)
Drain pipe
connection
Wiring connection
In Case of Getting the Pipe
Through a Hole in the Wall
Correct
mm (in.)
Hole
Gas Pipe Liquid Pipe
Ø12.7 (1/2) Attach a cap or put a plastic bag Ø6.35 (1/4)
over the pipe end.
In Case of Rain
Correct
Rain water
can come in.
Rubber Band
Attach a cap or put a plastic
bag over the pipe end.
Incorrect
Incorrect
Hole
Hole
• Use the specified refrigerant (R32) to the outdoor unit in the
refrigerant cycle. Do not charge the unit with material other than
R32 such as hydrocarbon refrigerants (propane or etc.), oxygen,
flammable gases (acetylene or etc.) or poisonous gases when
installing, maintaining and moving the unit. These flammables
are extremely dangerous and may cause an explosion, a fire,
and injury.
?
N O T E
Refrigerant liquid pipe connection
1
2
Correct
Do not place the pipe directly on the ground.
Incorrect Correct
Hole
Attach a cap or put a plastic bag
over the pipe end.
Attach a cap or put a plastic
bag over the pipe end.
Incorrect
Cap or plastic bag
• Due to the change of refrigerant oil, the refrigerant cycle is more
subject to the entrance of foreign matters such as moisture, oxide
film and grease. Be careful that these substances do not enter
the refrigerant cycle during installation work. Otherwise, they may
Do not place the pipe
be trapped into such parts as the expansion valve, hindering the
directly on the ground.
operation.
Correct Incorrect
Attach a cap or put a plastic
bag over the pipe end.
3
In Case of Getting the Pipe
Through a Hole in the Wall
Do not place the pipe
directly on the ground.
Incorrect
Correct Incorrect
Incorrect
Hole Hole
Cap or plastic bag
In case of rain
In Case of Rain
Correct Incorrect Incorrect
Correct
Rain water
Rain water can
can come in.
come in
Rubber Band
Rubber band
Attach a cap or put a plastic
bag over the pipe end.
Do not p
directly
Correct
Attach a ca
bag over th