Refrigerant Piping & Refrigerant Charge - Hitachi SET FREE MINI RAS-3 Manuel D'installation

11
REFRIGERANT PIPING & REFRIGERANT CHARGE
14
Fix Unit to the wall
1. Fix the Unit onto the wall
as the figure indicates.
(field supplied stay)
2. Ensure the foundation so
that avoid the deforming
and noise.
3. In case of prevention
from vibration transfer to
the building, use rubber
Mat.
11. REFRIGERANT PIPING & REFRIGERANT CHARGE
11.1. PIPING MATERIALS
1. Prepare locally-supplied copper pipes.
2. Select the piping size with the correct thickness and
correct material which can have sufficient pressure
strength.
3. Select clean copper pipes. Make sure there is no dust
and moisture inside. Blow the inside of the pipes with
oxygen free nitrogen to remove any dust and foreign
materials before connecting pipes.
4. After connecting the refrigerant piping, seal the open
space between Knockout hole and refrigerant pipes
by using insulation material as shown bellow:
Unit
Side
NOTE:
− A system with no moisture or oil contamination will
give maximum performance and lifecycle compared
to that of a poorly prepared system. Take particular
care to ensure all copper piping is clean and dry
internally.
− There is no refrigerant in the cycle of the indoor unit.
Rubber
Material
(Field
Supplied)
Mark Dimension
Model 3.0Hp 4.0/5.0 Hp
A
511 796
(mm)
Nº Description
Insulation Material

Insulation Material

Field Supplied

Insulation Material

Suspended unit
1. Suspend the unit as the
drawing indicates.
2. Ensure that wall can
resist the Outdoor unit
weight indicated in
specification label plate.
3. It is recommended to
select each foot support
to bear the full weight of
the unit (in order to
consider stress fatigue
applied when unit is
working too).

CAUTION:
− -Cover the end of the pipe if the pipe has to be
inserted through a hole.
− -Do not put pipes on the ground directly without a cap
or vinyl tape at the end of the pipe.
Correct
− -If piping installation is not completed until next day or
over a longer period of time, braze off the ends of the
piping and charge with oxygen free nitrogen through
a Schrader valve type access fitting to prevent
moisture and particle contamination.
− -Do not use insulation material that contains NH3
because it can damage cooper pipe material and can
be a source of future leakage.
− -Completely insulate both refrigerant gas piping and
liquid piping between the indoor unit(s) and the
outdoor unit.
− -If not insulated, dew will ocur on the piping surface
Wall Bracket*
Anchor Bolts*
(*) field supplied
Incorrect