York EVJC 12, Руководство по установке

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81
by johnson controls
7
GB
Installation Instructions
Inspection
Upon reception, inspect the equipment and
notify both the carrier and the insurance
company, in writing, of any possible damage.
Environmental protection
Eliminate packing in accordance
with the regulations in force on
environmental conservation.
During installation and maintenance, keep
in mind that HFC-410A and oil POE are
used.
Safety
Installation and maintenance operations
of this air conditioning system should be
carried out only by qualified and expert
personnel.
Periodical maintenance operations should
be carried out, such as cleaning the coils and
air filters, so as to keep unit performance 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
interconnecting tubing length of 4 meters.
Each unit includes a connecting elbow for
the condensed water drain (on heat pump
models only). Each compressor is equip-
ped 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
circuit should be completely leakproof after
mounting.
This will help to obtain maximum performance
with minimum consumption, and avoid serious
damage to the unit. This is an ecological
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 corresponding indoor units.
Tubing to be used
Special care should be taken that the tubing
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 compressor
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 obstructions.
- Do not use strippers on copper-copper
joints.
- Connection between units should be
carried 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
cannot be liquefied by the compressor.
Any air and humidity remaining in the
cooling system has undesirable effects, as
indicated below. Consequently, they should
be eliminated 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 compressor.
Process
- Fit an adapter to the pump to avoid
contamination of the POE oil.
- 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 refrigerant
- R-410A refrigerant is a 50% binary mixture
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 circuit 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
°C
R-410A
pressure bar g
-1 6,8
7 8,9
43 25
54 32,6
- R-410A refrigerant should be charged
always 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
Ester) type synthetic oil.