High efficiency series
This new series of units combines elevated efficiency rates (EER) with the use of R134a refrigerant.
The excellent level of performance was achieved thanks to the accurate sizing of all internal components in order to fully exploit the characteristics of the ecological refrigerant used. Special attention was paid to all the heat exchange surfaces, fans and compressors.
The newly designed condenser coils with special construction features have larger surfaces, as do the new asymmetrical evaporators with improved and more efficient refrigerant distribution both in the liquid and steam phases.
The fans with elevated unit efficiency are suitably adjusted to optimise air flow to the condensing section and guarantee maximum silent-running in all operating conditions.
The new screw compressors are specially designed for R134a refrigerant. The continual adjustment feature constantly modulates the capacity of each compressor between 100% and 50% of its potential.
This adjustment mode also allows the exact power required by the system to be instantaneously delivered and precisely adapted to load variations. This in turn reduces the number of start-ups and consequently improves reliability. The accompanying unit adjustment
feature, based on evaporator outlet water temperature control with Quick Mind adjustment logic, guarantees extremely small variations compared with the set point (+/- 0.5¡æ, probe precision limit) as well as considerably reducing the time required for the system to become fully operative.
The advantages of the continual adjustment of individual compressors are enhanced with the use of electronic thermostat valves (optional for the entire range).
Their precision and rapidity of response optimise load variations and allow stable conditions to be achieved in a very short time, even when operating in the part load mode.
The accurate sizing of the system combined with this series of units offers considerable energy saving and consequently significant reductions in running costs.
Autotunimg Defrost ( Climaveneta Patent)
The air to water heat pumps incorporate an innovative auto tuning defrosting system that is able to optimize the defrosting time with improvement of the total efficiency.
The new logic power is the capacity to modify automatically the parameters cycle by cycle in according to external conditions.
Three different algorithms (Timing Defrost, Auto tuning Defrost, Free Defrost) estimate exactly the quantity of ice inside the coils on the base of evaporating pressure, defrosting time of the preview cycle and external air temperature. The new system assure an efficiency and efficacy defrosting cycle.
Air-to-water heat pump
Reverse cycle air-to-water heat pump with manual mode switch. The
unit is supplied with anti-freeze oil and refrigerant and has been factory
tested. On-site installation therefore just involves making connections
to the mains power and water supplies.
Unit charged with R134a refrigerant.
STANDARD UNIT COMPOSITION
Base and frame in thick hot-galvanised shaped sheet steel. All parts
polyesters-painted.
Screw compressors
Semi-hermetic screw-compressors with 2 five and six-lobe rotors. The
five-lobe rotor is directly splined onto the 2-pole motor (2,950 rpm)
without the use of overgears. Compression occurs five times every
motor turn and the gas therefore discharges continuously without the
typical throbbing common to reciprocating compressors. Leading-edge
numerical control machines were used to make the rotors and machine
the bearing seats. Compressor cooling power is continuously
modulated from 100 to 50%. In addition to the standard no-load starting
feature, the motors are fitted with electric starting devices which limit
the power absorbed during the compressor starting phase. A check
valve on the coolant delivery line prevents the rotor from reversing after
stopping. Special maintenance-free bearings allow very long work
cycles. Lubrication is forced, without the use of an oil pump. The high
efficiency built-in oil separator ensures the constant presence of oil in
the compressor. The rotors are dynamically balanced to ensure that the
vibrations common to reciprocating compressors do not occur. The lack
of vibrations and the absence of delicate intake and delivery valves, in
addition to very fine manufacturing tolerances, sophisticated quality
controls during the production process and a limited number of moving
parts, guarantee quiet and highly reliable operation. Each compressor
is fitted with manual-reset motor thermal protection, delivery gas
temperature control, an oil level float, an oil level sight-glass and an
electric resistance for heating the oil when the compressor is stopped.
Water-refrigerant heat exchanger
Direct expansion heat exchanger type with asymmetric refrigerant
paths to maintain the correct refrigerant velocity inside the tubes during
both liquid and gaseous phases. The steel shell is insulated with a
closed-cell anti-condensation lining. The copper pipes are internally
grooved so as to improve the heat exchange. The pipes are
mechanically expanded onto the tube plate ends. An antifreeze electric
heater prevents the formation of ice inside the casing of the exchanger
when the unit is not operating but connected to the electrical supply.
Differential pressure switch for controlling the water flow is fitted
standard.
Refrigerant-air heat exchanger
Aluminium fins and copper tubes type heat exchanger. The aluminium
fins are correctly spaced to guarantee the best heat exchange
efficiency. The lower part of the exchanger functions as a sub-cooling
circuit thus increasing the cooling capacity.
Fans
Axial electric fans, protected to IP 54, with external rotor and profiled
die-cast aluminium blades. Housed in aerodynamic hoods complete
with safety grille. 6-pole electric motor with built-in thermal protection.
Refrigerant circuit
Main components of the refrigerant circuit:
- compressor discharge check valve,
- compressor discharge shut-off valve,
- compressor suction shut-off valve,
- liquid line shut-off valve,
- liquid line solenoid valve,
- dryer filter with replaceable cartridge,
- refrigerant line sight glass with humidity indicator,
- externally equalised thermostatic valve,
- high pressure safety valve,
- low pressure safety valve,
- high and low pressure transducers
- high pressure switches,
- liquid receiver and separator,
- 4-way reverse cycle valve.
Electric power and control panel
Electric power and control panel, built to EN 60204-1/EC 204-1 standards, complete with:
- control circuit transformer,
- general door lock isolator,
- power circuit with bar distribution system,
- fuses and contactors for compressors and fans,
- terminals for cumulative alarm block (BCA),
- remote ON/OFF terminals,
- spring-type control circuit terminal board,
- electric panel for outdoor installation,
- electronic controller.
- phase sequence relay.
Basic model
Unit without heat recovery.
Model with partial heat recovery (D)
Reverse cycle air-water heat pump fitted with a desuperheater.
Similarly to the basic unit, this version produces hot or chilled water in
the primary circuit, depending on which seasonal mode has been
selected. Compared with the basic configuration, this version features a
water/freon heat exchanger on the gas delivery line. This heat
exchanger, fitted in series with the traditional cooling circuit condenser,
is large enough to recover just desuperheating heat for the production
of medium-to-high temperature water (secondary or recovery circuit).
Hot water can be produced in the recovery circuit for domestic hot
water and the like both in summer and winter. The heating capacity of
this circuit is approximately equal to the power input of the compressor.
After going through this exchanger, the refrigerant gas enters the
condenser (refrigerant-air exchanger in summer and refrigerant-water
exchanger in winter) where condensation is completed. There are two
operating cycles:
WINTER MODE
The exchanger to which the main water circuit is connected works as a
condenser (the refrigerant-air exchanger works like an evaporator). The
refrigerant-water exchanger for partial heat recovery (desuperheater)
allows hot water to be produced in a second hydraulic circuit for
domestic hot water and the like.
SUMMER MODE
The exchanger to which the main water circuit is connected works as
an evaporator (the refrigerant-air exchanger works like a condenser).
The refrigerant-water exchanger for partial heat recovery
(desuperheater) allows hot water to be produced in the same way as
the winter mode.
AVAILABLE VERSIONS
B (base)
Standard unit. Unit with Low Temperature Pressure Device for
condensation control
LT (Low Temperature)
Dedicated version for low external air temperature ( down to ¨C10¡æ) in
heat pump modality. Unit with Low Temperature Device for
condensation control
LN (Low Noise)
Low noise version. This configuration features special soundproofing
for the compressor chamber and reduced fan speed. Unit with Low
Temperature Variable Speed Device for condensation control
SL (Super Low Noise)
Super low noise version. This configuration features special
soundproofing for the compressor chamber, reduced fan speed, an
oversized condensing section. Unit with Low Temperature Variable
Speed Device for condensation control
Accessories
Increased noise insulation (std on LN/SL units)
Spring isolators
Rubber isolators
DVV - for B/LT version
Oversized electric heater on evaporator
Increased evaporator insulation.
Cu/Cu condensing coils
Condensing coils with epoxy-coated fins
Condensing coils with Fin Guard Silver treatment
Coil protection with peraluman grille
Anti-intrusion grilles
Victaulic-couplings on evaporator
Flanges on evaporator
Evaporator water flow switch (supplied separately)
Power factor correction
Automatic circuit breaker for compressors
Automatic circuit breaker fans
Automatic circuit breakers
Free voltage contacts for compr. operation signalling
Remote keyboard
Numbered wires
Sequencer (supplied separately)
Electronic expansion valves
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