ERACS-R High efficiency series
This new series of units features elevated efficiency rates (EER) and the use of R134a refrigerant.
The excellent level of performance was achieved thanks to the accurate sizing of all internal components in order to exploit the characteristics of the ecological refrigerant used. Special attention was paid to all the heat exchange surfaces, compressors and fans.
The use of newly designed condenser coils with larger surfaces and special construction features, new asymmetrical evaporators with an improved and more efficient distribution of refrigerant both in the liquid and steam phases, new compressors featuring improved energy
efficiency and integrated with an economy circuit where necessary, fans with elevated unit efficiency, are just some of the innovations offered by this product.
The accurate sizing of the system combined with this series of units offers considerable energy saving and consequently significant reductions in operating 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 automatic mode switch and
total recovery. 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 therefore the gas discharges continuously without the
typical throbbing of reciprocating compressors. Leading-edge
numerical control machines were used to make the rotors and machine
the bearing seats. The slide valve can limit the cooling capacity of each
compressor by 50% and 75%. 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 refrigerant 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
the vibrations typical of reciprocating compressors do not occur. The
absence 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.
Refrigerant-water heat exchanger
Heat exchanger used as heat recovery to produce hot water. Finned
coil exchanger with steel shell and finned coil made from copper tubes
with external fins, mechanically expanded onto the tube plate ends.
The heads can be removed to inspect the tubes. The heat exchangers
are insulated with a closed-cell condensation proof lining in neoprene.
An antifreeze electric heater prevents the formation of ice inside the
exchanger when the unit is not working but connected to the electrical
supply.
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,
- electrovalves for circuit configuration.
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
Model with total heat recovery (R)
Reverse cycle air-water heat pump fitted with a heat recuperator. 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 parallel with the traditional cooling circuit
condenser, is large enough to recover condensation heat for the production of hot 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 cooling power plus the power input of the
compressor.
This version is particular suitable for two-tube systems with summer/winter switching in the main circuit and a secondary recovery circuit for the domestic hot water system. There are two operating cycles:
WINTER MODE
In the winter mode, hot water for the hydronic conditioning units is produced in the main water circuit which crosses the evaporator/condenser exchanger. Hot water can be produced on
request in the heat recovery exchanger for secondary users such as the domestic hot water system. It is not possible to produce hot water in the two exchangers belonging to the same cooling circuit at the same time. As the units feature various independent cooling circuits, in the presence of partial loads, hot water can be produced both in the main and the recovery circuits at the same time. The microprocessor can be programmed to give priority either to the production of hot water through the main evaporator/condenser exchanger or to the production of hot water in the recovery circuit.
SUMMER MODE
When the unit is working as a chiller, as well as producing chilled water in the main water circuit, it can also produce hot water in the recovery circuit if required.
It may not be necessary to produce chilled water during the summer season. This version, however, can produce hot water (in the recovery circuit) by automatically working as a heat pump. Condensation heat is discharged into the recovery exchanger.
It is therefore possible to satisfy, in summer, requests both for cold water in the main water circuit (e.g.: chilled water for hydronic units) and for hot water from the recovery circuit (e.g.: for domestic hot water). The following operating modes are therefore available:
Summer
- Production of chilled water in the main circuit
- Production of chilled water in the main circuit + hot water in the recovery circuit
- Production of just hot water in the recovery circuit
Winter
- Production of just hot water in the main circuit
- Production of just hot water in the recovery circuit
- Production of hot water both in the main circuit and in the recovery circuit
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 Pressure 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
ERACS-Q High efficiency series
This new series of units features elevated efficiency rates (EER) and
the use of R134a refrigerant.
The excellent level of performance was achieved thanks to the
accurate sizing of all internal components in order to exploit the
characteristics of the ecological refrigerant used. Special attention was
paid to all the heat exchange surfaces, compressors and fans.
The use of newly designed condenser coils with larger surfaces and
special construction features, new asymmetrical evaporators with an
improved and more efficient distribution of refrigerant both in the liquid
and steam phases, new compressors featuring improved energy
efficiency and integrated with an economy circuit where necessary,
fans with elevated unit efficiency, are just some of the innovations
offered by this product.
The accurate sizing of the system combined with this series of units
offers considerable energy saving and consequently significant
reductions in operating 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.
Multi-purpose "Energy Raiser" units
Multi-purpose "Energy-Raiser" units with automatic mode switch for
outdoor installation on four-pipe plants. 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
Supporting frame
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 therefore the gas discharges continuously without the
typical throbbing of reciprocating compressors. Leading-edge
numerical control machines were used to make the rotors and machine
the bearing seats. The slide valve can limit the cooling capacity of each
compressor by 50% and 75%. 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 refrigerant 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
the vibrations typical of reciprocating compressors do not occur. The
absence 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.
Refrigerant-water heat exchanger
Heat exchanger used as heat recovery to produce hot water. Finned
coil exchanger with steel shell and finned coil made from copper tubes
with external fins, mechanically expanded onto the tube plate ends.
The heads can be removed to inspect the tubes. The heat exchangers
are insulated with a closed-cell condensation proof lining in neoprene.
An antifreeze electric heater prevents the formation of ice inside the
exchanger when the unit is not working but connected to the electrical
supply.
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,
- electrovalves for circuit configuration.
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
The multi-purpose "Energy-Raiser" units were especially designed for
use with four-tube systems. Their hydraulic circuits are therefore
divided into two separate sections: one hot (condenser side) and one
cold (evaporator side). These units can produce hot and chilled water
at the same time and totally independently, adapting to the various
temperature requests inside the building.
There are three basic operating configurations which are totally
independent from external temperature conditions:
- production of just chilled water (the unit works as a simple chiller);
- production of just hot water (the unit works as an air-water heat
pump);
- combined production of hot and chilled water (the unit works as a
chiller featuring total recovery of condensation heat);
The above working configurations are selected automatically (on-board
microprocessor) with a view to optimising the energy used to satisfy the
various temperature requests by users.
PRODUCTION OF JUST HOT WATER
In this case, the unit works exactly like a heat pump which channels the
heat of the external atmosphere through an air-freon finned coil
(evaporator) in order to heat the water sent to the inside of the building
through a freon-water shell and tube heat exchanger (condenser). The
main difference compared with traditional reverse cycle heat pumps is
that the hot water is produced in a heat exchanger (from now on called
a heat recovery shell and tube exchanger) and not a shell and tube
evaporator. This is necessary in order to keep the hot and cold sections
separate as required by four-tube systems.
COMBINED PRODUCTION OF HOT AND CHILLED
WATER
If users request the hot and chilled water at the same time, the unit
behaves just like a chiller with total condensation heat recovery. The
condensation heat is recovered in a freon-water shell and tube heat
exchanger (heat recovery exchanger) in order to heat the water for hot
water users. The refrigerant evaporates in another freon-water shell
and tube heat exchanger (evaporator) and cools the water in order to
satisfy requests for cold water.
The multi-purpose "Energy-Raiser" units were designed to distribute
total power output (hot and cold) over various independent cooling
circuits (up to a maximum of 2 for each unit). Thanks to the
sophisticated microprocessor control on the unit, this solution optimises
variations in internal requirements by adopting the operating
configuration it considers to be most suitable for each cooling circuit.
The use of suitable thermal accumulations, both on the cold and hot
sides, offers effective system operating modularity and optimises
running costs.
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 Pressure 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 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
Flanges on evaporator
Flanges on recuperator
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
Pump relay
Numbered wires
Electronic expansion valves (only in chiller mode)
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