INS-3
DUAL, TRIPLE, POKER DC Inverter : 4. Installation
Multi Liberty
DC Inverter
CAUTION
Execute proper grounding. Do not connect the ground wire to a gas pipe, water pipe, lighting rod or
telephone ground wire. Improper placement of ground wires can result in electric shock.
The installation of an earth leakage breaker is necessary, specific for Inverter appliances. Not installing
an earth breaker may result in electric shock.
Do not install Units where there is a hazard about leakage of combustible gas. The rare event of leaked
gas collecting around Units could result in explosion or fire.
For the drain pipe, follow the installation instructions to ensure that it allows proper drainage. it is
very important to insulate the first section (about 1 metre) of the drain hose on Indoor Unit to prevent
condensation outside the piping. Inadequate discharge piping can result in water leakage and/or damages
on installation site.
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PRECAUTIONS TO TAKE WHEN INSTALLING R410A AIR CONDITIONERS
All the fixtures used for installing and checking the refrigerant system (gauge manifold, service hoses,
and so on) must be expressly designed for this kind of appliances (see further on).
As the vapor pressure of
R410A
refrigerant is about 1.6 times higher than R22 refrigerant at the same
temperature, you need to use refrigerant copper pipes having a sufficient thickness (at least 0.8mm),
depending on piping’s diameter.
Never use the same fixtures that are used on systems adopting R22 refrigerant. This is due to the fact
that systems adopting
R410A
refrigerant do not tolerate infiltrations of mineral refrigerant oil deriving from
circuit with R22. That above except for vacuum pump, provided that a one-way valve has been added
to the vacuum pump. This one-way valve must be able to operate in case of accidental turn off of the
vacuum pump itself (i.e.: blackout) during air purge operations.
In particular, the gauge manifold, the service hoses, the torque wrench (for tightening of flare connections
having 1/2” and 5/8” diameters), the flaring tool and the refrigerant cylinder must be exclusively designed
for
R410A
refrigerant.
Moreover, the electronic gas leakage detector must be exclusive for HFC refrigerant (high sensitiveness
type, lower than 3 grammes/year) so the same device as for R407C refrigerant can be used.
All the operation of refrigerant charging must be carried out with R410A refrigerant in liquid phase. For this
purpose, an electronic balance and a refrigerant cylinder with suction from its bottom are necessary. In this
way, the exact amount of refrigerant in liquid phase can be charged from the bottom of charging cylinder.
The liquid phase of refrigerant drawed from the cylinder for the above mentioned operations must be over
90% (in weight percentage) compared to the gaseous phase.
In case of considerable refrigerant leakage from the system, avoid to do partial topping up, because the
exact amount of refrigerant left inside the air conditioner’s circuit will remain unknown, definitely leading
to excessive or insufficient refrigerant charge.
As
R410
refrigerant is a binary mixture of R32 and R125,
refrigerant leakage in gaseous phase may
change slightly ratio between the two components, nevertheless this does not remarkably modify
the working conditions inside refrigerant circuit
.
In case of leakages of R410A refrigerant, it is strongly recommended to discharge - of course by recovering
it - all refrigerant, and to perform all necessary steps for a new charge of refrigerant, complete and weighed
out according to indications on Outdoor Unit’s label, after vacuum operation.
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