Hitachi YUTAKI M R32 RASM-4VR1E Manual De Instrucciones página 23

REFRIGERANT AND WATER PIPING
!
CAUTION
Pay attention to the following for installation:
• Installation shall ensure that unit will not incline, vibrate,
make noise or fall down by a blast of wind or in an earthquake.
Calculate quake-resistance strength to ensure that installation
is strong enough against falling. Fix the unit with wires (field
supplied) when installing in a location without walls or
windbreak and likely exposed to a blast of wind.
• Apply vibration-proof material where necessary.
◆ Installing location where the unit will be
exposed to strong wind
Adverse strong
wind
Strong winds against the unit's air outlet causes short
circuits and these can be the consequences:
• Lack of air flow and adversely affect to normal
function.
• Frequent frost acceleration.
• Fan can rotating very fast until it breaks.
Follow the instructions below to install on a rooftop
or a location without surrounding buildings, where
strong wind is expected against the unit:
1. Choose a location where the outlet or inlet side of
the product will not be exposed to strong wind.
2. In case the fulfilment of point 1 is not possible, it is
recommended to use the optional parts.
!
CAUTION
Excessive strong wind against the unit outlet may cause inverse
rotation and damage the fan motor.
7. REFRIGERANT AND WATER PIPING
7.1 General notes before performing piping
work
• Prepare locally-supplied copper pipes.
• Select the piping size with the correct thickness and
correct material able to withstand sufficient pressure.
• Select clean copper pipes. Make sure that there is no
PMML0578 rev.0 - 04/2022

A system with no moisture or oil contamination will give maximum
performance and life-cycle compared to that of a poorly prepared
system. Take particular care to ensure that all copper piping is
clean and dry internally.
• Cap the end of the pipe when pipe is to be inserted
• Do not put pipes on the ground directly without a cap
Air flow
• If piping installation is not completed until next day
• It is advisable to insulate the water pipes, joints
Adverse strong
wind
• Do not use insulation material that contains NH3, as
• It is recommended to use flexible joints for the water
• Water circuit must be performed and inspected by a
• Proper water pipe inspection should be performed
7.2
7.2.1 Refrigerant charge
The R32 refrigerant is factory charged in the outdoor
unit.
7.2.2 Precautions in the event of gas refrigerant
The installers and those responsible for drafting the
specifications are obliged to comply with local safety
codes and regulations in the case of refrigerant leakage.
!
• Do not charge OXYGEN, ACETYLENE, or other flammable and
dust or moisture inside the pipes. Blow the inside of
the pipes with oxygen free nitrogen to remove any
dust and foreign materials before connecting them.
NOTE
through a wall hole.
or vinyl tape at the end of the pipe.
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.
and connections in order to avoid heat loss and
dew condensation on the surface of the pipes or
accidental injures due to excessive heat on piping
surfaces.
it can damage copper pipe material and become a
source of future leakage.
piping inlet and outlet in order to avoid vibration
transmission.
licensed technician and must comply with all relevant
European and national regulations.
after piping work to assure there is no water leakage
in the space heating circuit.
Refrigerant circuit
leaks
CAUTION
poisonous gases into the refrigerant because an explosion can
occur. It is recommended that oxygen free nitrogen be charged
for these types of tests cycle when performing a leakage test or
an airtight test. These types of gases are extremely dangerous.
EN
7