Johnson Controls York VITALITY Serie Instrucciones De Instalación página 16

so as to avoid the transmission of vibra-
tions of the unit. If the ducts are made
of flexible material, they do not transmit
vibrations.
2.- On units VCH 45A, 0A, 75A and 90A,
two different ducts must be installed, one
for each fan up to the discharge, to avoid
the recirculation of air.
3.- If the outdoor air coil air discharge is
carried out through the ducts, it is con-
venient to have the first 1-meter section
made of galvanized sheeting so as to
avoid deterioration due to a possible
creeping of drops.
Indoor unit air ducts
1.- Connect the ducts, isolating them from
the unit by means of a flexible hose,
preferably of non-flammable material,
so as to avoid the transmission of vibra-
tions of the unit. If the ducts are made
of flexible material, they do not transmit
vibrations.
2.- It is recommendable to install a damper
at each by-pass of the discharge duct
for the purpose of carrying out a correct
balance of the system.
3.- Leave easy access for cleaning and
changing the air filters.
Drain connections, VCH 20 to
90A outdoor unit
Install the drain pipes of each tray through
a siphon.
The drain line must have a minimum slope
of 2 cm. per each metre in length.
The unit connections are made of copper
piping with an exterior diameter of 28.5.
Attention:
When the heat pump is operating at outdoor
temperatures of less than 5°C, the drain pipe
could be obstructed due to freezing. So, if
installed in exteriors, it is convenient to take
this possibility into account, installing an
electric heater at the drain connection and
around the antivibratory elements of the
compressor, connecting same electrically
as per the diagrams herein.
Drain connections, VIR 25 to
90A indoor unit
It is necessary to connect a condensed wa-
ter drain pipe to the evaporating unit.
Install the drain pipe through a siphon.
Leave a minimum level difference of 25 mm.
between the height of the unit connection
and the line after the siphon.
An access must be left so as to fill the
siphon with water at the beginning of each
season.
The drain line must have a minimum slope
of 2 cm. per each metre in length.
Insulate the condensed water drain pipe so
as to avoid leaks and damaging the floor.
Drain pipe insulation
Insulate the condensed water drain pipe so
as to avoid leaks and damaging the floor.
1
Make sure water evacuation is being carried
out correctly.
Interconnecting units
The installation of a unit compris-
es:
- Assembly of the unit.
- Connection of refrigerant pipes.
- Wiring of the unit.
When installing Split units, make sure the
cooling circuit is completely sealed after as-
sembly, for the purpose of avoiding leaks.
This will contribute to achieving maximum
performance with minimum consumption,
and will avoid serious damage to the unit.
Furthermore, this is an ecological precau-
tion.
Installation of interconnecting
pipes
The length of the interconnecting pipes of
the units should be as short as possible.
The maximum admissible distances to the
circuit and the standard pipe diameter are
indicated in the tables and graphs below
(without changing the pipe outlet diameter
of the units).
When there are horizontal sections of over
20 metres, it is convenient to have the
suction line tilt 2% in the direction of the
compressor.
- The maximum allowable flow in any sec-
tion is 15 m/s.
- With the limitations indicated and without
changing the diameter of the outgoing unit
pipes, no siphons are needed.
- The liquid should have a minimum of 1°C
of subcooling at the intake of the expan-
sion valve, so as to avoid accumulation
of gas in the ascending liquid lines before
entering the expansion system.
- For interconnecting lines of over 25 me-
tres, oil should be added (30 gr/m. of
length).
Layout 1 (Outdoor unit up)
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L: Total piping length (vertical + horizontal sections) in
course and in one only direction.
H: Vertical distance between units.
A: Cooling liquid line.
B: Cooling gas line.
GB
Layout 2 (Indoor unit up)
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L: Total piping length (vertical + horizontal sections) in
course and in one only direction.
H: Vertical distance between units.
A: Cooling liquid line.
B: Cooling gas line.
Pipes to be used
When installing the pipes that join the two
units, take special care in checking that the
pipes used are kept clean and dry prior to
installation. It is advisable to take the follow-
ing recommendations into account:
- Use cooling quality copper pipes only (K
or L type, S/ASTMB88).
- Do not work outside when raining.
- The ends of the pipes should remain
closed throughout the installation.
- Do not leave the filter-dryers nor the com-
pressor out in the open.
- When welding, use low melting point
rods. These should contain 5% silver
minimum.
- While welding and as long as the pipe
remains hot, maintain a current of dry
nitrogen so as to avoid rust and scaling
inside the pipe. This could cause contami-
nation and obstructions.
- Do not use strippers at the copper-copper
joints.
- Connection to the units should be carried
out by using the flaring method.
Insulation of refrigerant pipes
Since the interconnecting distribution pipes
to the coil are installed in the outdoor unit,
both the larger and the smaller diameter
pipes are on the relative low pressure side
of the system.
Consequently, to avoid condensed water
from the pipes dripping on the floor, both
must be insulated with adequate insulation.
The thickness of same should be at least
8 mm.