Hitachi RPC-3.0FSR - REFRIGERANT PIPING WORK

13 REFRIGERANT PIPING WORK
For the refrigerant piping work, vacuum pump and refrigerant charge, the details shall be referred to Installation and Operation
Manual of the outdoor unit.
13.1 PIPING MATERIALS
1 The tolerance of refrigerant piping length di󰀨ers depending
on the combination with the outdoor unit. The details shall be
referred to Installation and Operation Manual of the outdoor
unit.
2 Select the piping size from the following table.
Unit: mm
Model Gas piping Liquid piping
RPC-1.5FSR Ø12.7 (1/2) Ø6.35 (1/4)
RPC-2.0FSR Ø12.7 (1/2) Ø6.35 (1/4)
RPC-(2.5-6.0)FSR Ø15.88 (5/8) Ø9.52 (3/8)
3 Prepare eld-supplied copper pipes.
4 Select clean copper pipes. Make sure there is no dust and
moisture inside.
5 As the new refrigerant (R410A) is adopted, the refrigerant
oil has been also changed, which tends to be a󰀨ected by
foreign matters such as moisture, oxide lm, fat. Perform the
installation work with care not to enter moisture, dust or old
refrigerant into the refrigerant cycle, otherwise the parts such
as expansion valve bite foreign matter and the operation
may be unavailable.
6 Use a pipe cutter to avoid a grind swarf generation for the
pipe cutting work. (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.
Correct
Correct
Incorrect
Incorrect
Incorrect
Correct
Hole
Hole
When installing pipe through the wall,
secure a cap at the end of the pipe.
Do not place the pipe directly on the
ground.
Attach a cap or
vinyl tape.
Attach a cap or
vinyl tape.
Rain water
can enter.
Attach a cap or vinyl bag
with rubber band.
REFRIGERANT PIPING WORK
PMML0551 rev.4 - 07/2023 - A10762310A
17
EN