 
Frequently asked questions [back
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What
is the difference between Comfort Cooling and Air Conditioning?
Air Conditioning is generally a term given to the cooling of a
room down to a set temperature.
Calculations would normally have
been made to provide enough cooling to a given room or space so
that a desired temperature may be maintained.
Comfort Cooling is a 'general'
term given to a simplified on/off system which will provide a
nominal cooling effect.
Calculations may not have been
carried out and just a 'kW of cooling' figure given.
The cooling effect on a room or
space will be dependent upon the heat gain and volume of air from
the system provided.
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Is
the system noisy?
Units generally incorporate compressors and these do vibrate when
in operation.
If the unit is a 'bolt on' type
and is situated in a roof space care should be taken on its
installation and siting.
If it is a remote unit, as the
Villacool™ system (ie. Sited external to the building) this will
not affect the noise
levels within the dwelling.
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What
levels of cooling can we expect within the room itself?
As we provide Comfort Cooling and not Air Conditioning we do not
provide heat gain/cooling calculations. We therefore cannot say
with confidence the expected temperature drop within a room.
Rather than being an expensive
thermostatically controlled air conditioning system the Villacool™
unit will cool and dehumidify the supply air by 8-12ºC on outside
air temperature. The reduction in actual room temperature will
vary dependant on the amount of heat gain within the building and
the amount of air provided by the ventilation system. |
Technical Specification
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 The
Villacool™ external condensing unit is capable of 4.0Kw (approx) of
cooling, operating on refrigerant R407C and is suitable for airflows of
between 350 and 700m³hr. The greater the airflow the better the
performance.
Dimensions: 1000mm L, 1000mm
H, 300mm D (+100mm air space behind)
Power Supply
A single phase 20A supply is
required to outdoor unit position together with motor rated c type
breaker. The outside unit will be complete with integral isolator.
Pipework
The Interconnecting pipework
will be suction pipe 19mm internal diameter and is complete with 12mm low
temperature insulation.
Liquid pipe 6mm internal
diameter. Interconnecting pipework can be up to 30m price based on 10m or
less. Interconnecting cable 4 core 1.5mm SY (braided multicore).
Evaporator coil copper
aluminium with steel casing painted. Size of evaporator 600mm L x 400mm H
x 180mm D. There is transformation ducting onto and off the coil, total
length of entire cooling system internal is 1200mm L x 400mm H x 600 D.
There is pipework onto the
coil but this can be either hand if notice is given but generally on the
left.
Control Strategy
Villavent® will provide a
control panel to be located next to the indoor coil dependant on access.
The control panel will be
approx 200mm x 200mm 140mm complete with isolator and control relays for
interconnecting with thermostats located in the coil to protect against
ice build up; air off to protect against condensation in the supply
ducting and air on to prevent cooling during winter (or thermostat in room
which is favoured or possible).
Capacity
On maximum fan speed a
cooling effect of 8-12°C (from ambient), can be achieved off of the coil
adjacent to the Heat Recovery unit in the roofspace, in summertime.
Installation Instructions [back
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DIY first fix kit
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15m 5/8" copper
tube refrigeration quality |
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15m 1/4" copper
tube refrigeration quality |
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15m 5/8" low
temperature pipe insulation |
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20m 4 core braided
cable |
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1 x 5/8"
external bending spring |
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1 x 1/4"
external bending spring |
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Fixings kit (inc
cable ties, tie holders, PVC tape, pipe end caps, screws, rawl
plugs) |
Supplied in a box ready to send direct
to customer.
DIY first fix
instructions
The cooling system consists of an
outdoor unit, cooling coil, control panel and associated pipework and
cable.
The cooling coil and control panel should be installed next to
the Villavent ventilation unit.
The outdoor unit in a suitable location
as near to the cooling coil as possible. Between the cooling coil and
the outdoor unit locations the pipework and control cable will need to
be installed.
The pipework consists of 5/8" and
1/4" copper tube, refrigeration quality. The larger of the two
pipes 5/8" should be fully insulated using the supplied insulation
as this pipe can become very cold and condensate if not properly
insulated.
The copper tube should be
unrolled on to a flat clean surface to prevent twisting, denting and
kinking.
The pipework route should be as straight as possible, however
it is possible to bend the pipes to 90° using the springs provided to
prevent kinking the pipe.
The control cable should be routed with the
pipework and should be 2.5m longer at each end than the copper tube. The
copper tube can be cut using pipecutters or a hacksaw.
Care should be taken to prevent any
debris or moisture entering the pipework at all times.
Once the pipework
and control cable have been routed and fixed the ends of all the pipes
should be sealed using the heat shrink provided.
Care should be taken when enclosing the
pipework and control cabling not to puncture the pipework, insulation or
cable with fixings.
Additional notes [back
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First Fix
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Internal pipework can
run in internal cavities, provided it is insulated. |
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Outside condensing
unit can be painted to suit surrounding area (additional cost
£75.00 nett) |
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Condensing unit can
be up to 30m from ventilation unit (15m supplied as standard). |
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Acoustic jacket can
be supplied for compressor in outside condensing unit if in noise
sensitive area (near patio, back garden, neighbours, garden etc). |
Second Fix
This consists of the supply
and installation of the cooling coil in the roofspace, thermostat and the
outside unit to the refrigeration pipework. This is carried out by a
Villavent authorised commissioning engineer.
User Instructions [back
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The Villacool™ cooling systems installed are a
direct expansion coil installed in the fresh air ductwork off the
Villavent® ventilation system.
The cooling system control panel is
located next to the evaporator coil and has an isolator for on / off
control in the event of failure.
The user has a thermostat with on / off
control within a central area. These are usually wall mounted at approx
1.5m on a side wall or centrally on a pillar.
The on / off switch has
the indicators O / 1 for off and on respectively.
The dial thermostat
has a range from 5°C to 30°C however for use as an air conditioning
thermostat we have restricted the minimum temperature to 16°C. This is
the lowest set point advisable on these systems.
Further controls on the cooling system
are air off coil thermostat set to 5°C and an ice protection thermostat
on the coil set to -3°C. These should not be adjusted by the users and
are for service engineers only.
For best cooling effect the
Villavent® ventilation system should be set at maximum ventilation rate
and room thermostat set to on and 16°C.
The drain from the cooling coil carries
any condensate to the overflow to the exterior of the building.
The outdoor unit houses the compressor
and as such prevents mechanical noise emitting from the ventilation unit
itself.
Quotation [back
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For a free no obligation quotation click
here to complete our enquiry form and E-mail
or post us with your plans, sections and elevations to sales@villavent.co.uk
(ideally in AutoCAD release 14 in a dwg format).
If you would like more
information on Villavent® products and services please call
01993 778481 or contact us.
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