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Installation Instructions
Inspection
Upon reception, inspect the equipment and
notify both the carrier and the insurance
company, in writing, of any possible dam-
age.
Environmental protection
Eliminate packing in accordance
with the regulations in force on en-
vironmental conservation.
During installation and mainte-
nance, keep in mind that HFC-410A and oil
POE are used.
Safety
Installation and maintenance operations of
this air conditioning system should be car-
ried out only by qualified and expert per-
sonnel. Periodical maintenance operations
should be carried out, such as cleaning the
coils and air filters, so as to keep unit per-
formance at an optimum.
Caution
This unit should be installed and
used in accordance with:
- Low Voltage Electrotechnical Regulations.
- Safety Regulations for Cooling Plants and
Installations.
- Regulations on Pressure Equipment.
- Basic Construction Standards.
- Technical Construction Standards.
- Local ordinances.
Location
(Fig. 1 to 3)
To be installed directly outdoors. Place the
unit on a consistent base and fasten by
means of bolts.
Outdoor units
These units are supplied with an adequate
R-410A refrigerant load for an interconnect-
ing tubing length of 5 meters.
Each unit includes a connecting elbow for
the condensed water drain (on heat pump
models only). Each compressor is equipped
with an acoustic isolation casing to reduce
noise to a minimum.
Installation
Unit installation comprises:
- Unit mounting.
- Refrigerant tubing connections.
- Condensed water drain connections in
heat pump units.
- Unit wiring.
Clearances, outdoor unit
A minimum clearance is required around the
units for the circulation of air and access for
maintenance servicing, as indicated in the
general dimensions.
Interconnection of the units
When installing Split units, the cooling cir-
8
cuit should be completely leakproof after
mounting.
This will help to obtain maximum perform-
ance with minimum consumption, and avoid
serious damage to the unit. This is an eco-
logical precaution as well.
Installation of interconnecting
tubing
The length of the interconnecting tubing of
the units should be as short as possible. The
maximum admissible distances with regard
to the circuit and standard tubing diameters
are indicated on each apparatus of the cor-
responding indoor units.
Tubing to be used
Special care should be taken that the tub-
ing that interconnects the two units is kept
clean and dry, even prior to installation. It is
advisable to take into account the following
recommendations:
- Use copper refrigerant quality tubing only.
- Do not work outdoors when raining.
- The ends of the tubing should remain
closed during installation.
- Do not leave dryer filters or the compres-
sor out in the open air.
- For welding use low melting point rods
with a 5% silver content, minimum.
- When welding and as long as the tubing
is hot, maintain a flow of dry nitrogen so
as to avoid internal rusting and scaling
that could cause contamination and ob-
structions.
- Do not use strippers on copper-copper
joints.
- Connection between units should be car-
ried out by means of the flaring method.
Insulation of refrigerant tubing
Due to the fact that the capillary tubing is
installed in the outdoor unit, both the larger
as well as the smaller diameter tubes are in
the relative low pressure side of the system.
Consequently, to avoid condensed water
dripping on the floor, both tubes should be
insulated adequately. The thickness of same
should be at least 8 mm. See Fig. 4.
Emptying and dehydrating
(Fig. 5)
Air does not act as a refrigerant since it can-
not be liquefied by the compressor. Any air
and humidity remaining in the cooling sys-
tem has undesirable effects, as indicated
below. Consequently, they should be elimi-
nated completely.
- High pressure increases.
- Consumed power supply increases.
- Equipment performance decreases.
- Water contained in the air could freeze
and block the capillaries.
- Water can cause corrosion of certain parts
of the circuit, and deterioration of the com-
pressor.
Process
- Fit an adapter to the pump to avoid con-
tamination of the POE oil.
GB
- Connect the vacuum pump and service
pressure gauges to the system.
- Carry out a vacuum of up to at least 50
microns.
- Make sure the system does not loose
vacuum.
- If it does, detect leaks and repair.
Cooling Interconnections
R-410A refrigerante
- R-410A refrigerant is a 50% binary mix-
ture of HFC-32 and HFC-125. Its reaction
as a refrigerant gas is nearly azeotropic
(creep below 0.17°K). Does not contain
chlorine and, thus, it does not harm the
ozone layer. Nevertheless, should a cir-
cuit be drained, the gas should always be
recovered and in no case released in the
atmosphere.
- In comparison to R-22, R-410A operates
at higher pressures. At 60% higher on the
high side and at 75% more on the low
side. See following table.
Temperature
R-22 pressure
bar g
°C
-1
3.8
7
5.2
43
15.2
54
20.3
- R-410A refrigerant should be charged al-
ways in liquid form. Should the tank not
have a dipping pipe, it should be turned
upside down.
- The R-410A refrigerant tanks stand out
because they are pink.
- Due to the fact that it does not contain
chlorine, R-410A refrigerant can be used
only in combination with POE (Polyol Es-
ter) type synthetic oil.
- R-410A refrigerant is not flammable at at-
mospheric pressure. Nevertheless, as it
contains 50% HFC-32, it should never be
pressurised with air or any gas other than
nitrogen (the same as R-22).
POE oil
- POE oil is highly hygroscopic. Its water
absorbing capacity is 15 times greater
than mineral oil.
- POE oil containers should be metallic and
should be kept open the least time possi-
ble. They should be hermetically sealed
after use.
- Never open a circuit or compressor
charged with POE oil while under vacuum.
Should either one be under atmospheric
pressure, it should not remain open for
more than 15 minutes. Should this not be
possible, a flow of dry nitrogen should be
established.
- POE oil cannot be mixed with mineral oil.
Amounts of over 5% of mineral oil mixed
with POE will cause transitory obstruc-
tions within the expansion systems.
R-410A
pressure bar g
6.8
8.9
25
32.6
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